/* Copyright 2020 Jaakko Keränen <jaakko.keranen@iki.fi>

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

/* TODO: This file is a little too large. DocumentWidget could be split into
   a couple of smaller objects. One for rendering the document, for instance. */

#include "documentwidget.h"

#include "app.h"
#include "audio/player.h"
#include "bookmarks.h"
#include "command.h"
#include "defs.h"
#include "gmcerts.h"
#include "gmdocument.h"
#include "gmrequest.h"
#include "gmutil.h"
#include "history.h"
#include "indicatorwidget.h"
#include "inputwidget.h"
#include "keys.h"
#include "labelwidget.h"
#include "media.h"
#include "paint.h"
#include "mediaui.h"
#include "scrollwidget.h"
#include "touch.h"
#include "translation.h"
#include "util.h"
#include "visbuf.h"
#include "visited.h"

#if defined (iPlatformAppleMobile)
#   include "ios.h"
#endif

#include <the_Foundation/file.h>
#include <the_Foundation/fileinfo.h>
#include <the_Foundation/objectlist.h>
#include <the_Foundation/path.h>
#include <the_Foundation/ptrarray.h>
#include <the_Foundation/ptrset.h>
#include <the_Foundation/regexp.h>
#include <the_Foundation/stringarray.h>
#include <SDL_clipboard.h>
#include <SDL_timer.h>
#include <SDL_render.h>
#include <ctype.h>
#include <errno.h>

/*----------------------------------------------------------------------------------------------*/

iDeclareType(PersistentDocumentState)
iDeclareTypeConstruction(PersistentDocumentState)
iDeclareTypeSerialization(PersistentDocumentState)

enum iReloadInterval {
    never_RelodPeriod,
    minute_ReloadInterval,
    fiveMinutes_ReloadInterval,
    fifteenMinutes_ReloadInterval,
    hour_ReloadInterval,
    fourHours_ReloadInterval,
    twicePerDay_ReloadInterval,
    day_ReloadInterval,
    max_ReloadInterval
};

static int seconds_ReloadInterval_(enum iReloadInterval d) {
    static const int mins[] = { 0, 1, 5, 15, 60, 4 * 60, 12 * 60, 24 * 60 };
    if (d < 0 || d >= max_ReloadInterval) return 0;
    return mins[d] * 60;
}

static const char *label_ReloadInterval_(enum iReloadInterval d) {
    switch (d) {
        case never_RelodPeriod:
            return cstr_Lang("reload.never");
        case day_ReloadInterval:
            return cstr_Lang("reload.onceperday");
        case minute_ReloadInterval:
        case fiveMinutes_ReloadInterval:
        case fifteenMinutes_ReloadInterval:
            return formatCStr_Lang("num.minutes.n", seconds_ReloadInterval_(d) / 60);
        default:
            return formatCStr_Lang("num.hours.n", seconds_ReloadInterval_(d) / 3600);
    }
    return "";
}

struct Impl_PersistentDocumentState {
    iHistory *history;
    iString * url;
    enum iReloadInterval reloadInterval;
};

void init_PersistentDocumentState(iPersistentDocumentState *d) {
    d->history        = new_History();
    d->url            = new_String();
    d->reloadInterval = 0;
}

void deinit_PersistentDocumentState(iPersistentDocumentState *d) {
    delete_String(d->url);
    delete_History(d->history);
}

void serialize_PersistentDocumentState(const iPersistentDocumentState *d, iStream *outs) {
    serialize_String(d->url, outs);
    writeU16_Stream(outs, d->reloadInterval & 7);
    serialize_History(d->history, outs);
}

void deserialize_PersistentDocumentState(iPersistentDocumentState *d, iStream *ins) {
    deserialize_String(d->url, ins);
    if (indexOfCStr_String(d->url, " ptr:0x") != iInvalidPos) {
        /* Oopsie, this should not have been written; invalid URL. */
        clear_String(d->url);
    }
    const uint16_t params = readU16_Stream(ins);
    d->reloadInterval = params & 7;
    deserialize_History(d->history, ins);
}

iDefineTypeConstruction(PersistentDocumentState)

/*----------------------------------------------------------------------------------------------*/

iDeclareType(DrawBufs)

enum iDrawBufsFlag {
    updateSideBuf_DrawBufsFlag      = iBit(1),
    updateTimestampBuf_DrawBufsFlag = iBit(2),
};

struct Impl_DrawBufs {
    int            flags;
    SDL_Texture *  sideIconBuf;
    iTextBuf *     timestampBuf;
};

static void init_DrawBufs(iDrawBufs *d) {
    d->flags = 0;
    d->sideIconBuf = NULL;
    d->timestampBuf = NULL;
}

static void deinit_DrawBufs(iDrawBufs *d) {
    delete_TextBuf(d->timestampBuf);
    if (d->sideIconBuf) {
        SDL_DestroyTexture(d->sideIconBuf);
    }
}

iDefineTypeConstruction(DrawBufs)

/*----------------------------------------------------------------------------------------------*/

static void animateMedia_DocumentWidget_        (iDocumentWidget *d);
static void updateSideIconBuf_DocumentWidget_   (const iDocumentWidget *d);

static const int smoothDuration_DocumentWidget_  = 600; /* milliseconds */
static const int outlineMinWidth_DocumentWdiget_ = 45;  /* times gap_UI */
static const int outlineMaxWidth_DocumentWidget_ = 65;  /* times gap_UI */
static const int outlinePadding_DocumentWidget_  = 3;   /* times gap_UI */

enum iRequestState {
    blank_RequestState,
    fetching_RequestState,
    receivedPartialResponse_RequestState,
    ready_RequestState,
};

enum iDocumentWidgetFlag {
    selecting_DocumentWidgetFlag             = iBit(1),
    noHoverWhileScrolling_DocumentWidgetFlag = iBit(2),
    showLinkNumbers_DocumentWidgetFlag       = iBit(3),
    setHoverViaKeys_DocumentWidgetFlag       = iBit(4),
    newTabViaHomeKeys_DocumentWidgetFlag     = iBit(5),
    centerVertically_DocumentWidgetFlag      = iBit(6),
    selectWords_DocumentWidgetFlag           = iBit(7),
    selectLines_DocumentWidgetFlag           = iBit(8),
};

enum iDocumentLinkOrdinalMode {
    numbersAndAlphabet_DocumentLinkOrdinalMode,
    homeRow_DocumentLinkOrdinalMode,
};

struct Impl_DocumentWidget {
    iWidget        widget;
    enum iRequestState state;
    iPersistentDocumentState mod;
    int            flags;
    enum iDocumentLinkOrdinalMode ordinalMode;
    size_t         ordinalBase;
    iString *      titleUser;
    iGmRequest *   request;
    iAtomicInt     isRequestUpdated; /* request has new content, need to parse it */
    iObjectList *  media;
    enum iGmStatusCode sourceStatus;
    iString        sourceHeader;
    iString        sourceMime;
    iBlock         sourceContent; /* original content as received, for saving */
    iTime          sourceTime;
    iGmDocument *  doc;
    int            certFlags;
    iBlock *       certFingerprint;
    iDate          certExpiry;
    iString *      certSubject;
    int            redirectCount;
    iRangecc       selectMark;
    iRangecc       initialSelectMark; /* for word/line selection */
    iRangecc       foundMark;
    int            pageMargin;
    iPtrArray      visibleLinks;
    iPtrArray      visiblePre;
    iPtrArray      visibleWideRuns; /* scrollable blocks; TODO: merge into `visiblePre` */
    iArray         wideRunOffsets;
    iAnim          animWideRunOffset;
    uint16_t       animWideRunId;
    iGmRunRange    animWideRunRange;
    iPtrArray      visibleMedia; /* currently playing audio / ongoing downloads */
    const iGmRun * grabbedPlayer; /* currently adjusting volume in a player */
    float          grabbedStartVolume;
    int            mediaTimer;
    const iGmRun * hoverPre;    /* for clicking */
    const iGmRun * hoverAltPre; /* for drawing alt text */
    const iGmRun * hoverLink;
    const iGmRun * contextLink;
    const iGmRun * firstVisibleRun;
    const iGmRun * lastVisibleRun;
    iClick         click;
    iString        pendingGotoHeading;
    float          initNormScrollY;
    iAnim          scrollY;
    iAnim          sideOpacity;
    iAnim          altTextOpacity;
    iScrollWidget *scroll;
    iWidget *      menu;
    iWidget *      playerMenu;
    iVisBuf *      visBuf;
    iPtrSet *      invalidRuns;
    iDrawBufs *    drawBufs; /* dynamic state for drawing */
    iTranslation * translation;
    iWidget *      phoneToolbar;
};

iDefineObjectConstruction(DocumentWidget)

void init_DocumentWidget(iDocumentWidget *d) {
    iWidget *w = as_Widget(d);
    init_Widget(w);
    setId_Widget(w, "document000");
    setFlags_Widget(w, hover_WidgetFlag, iTrue);
    init_PersistentDocumentState(&d->mod);
    d->flags = 0;
    d->phoneToolbar = NULL;
    iZap(d->certExpiry);
    d->certFingerprint  = new_Block(0);
    d->certFlags        = 0;
    d->certSubject      = new_String();
    d->state            = blank_RequestState;
    d->titleUser        = new_String();
    d->request          = NULL;
    d->isRequestUpdated = iFalse;
    d->media            = new_ObjectList();
    d->doc              = new_GmDocument();
    d->redirectCount    = 0;
    d->ordinalBase      = 0;
    d->initNormScrollY  = 0;
    init_Anim(&d->scrollY, 0);
    d->animWideRunId = 0;
    init_Anim(&d->animWideRunOffset, 0);
    d->selectMark       = iNullRange;
    d->foundMark        = iNullRange;
    d->pageMargin       = 5;
    d->hoverPre         = NULL;
    d->hoverAltPre      = NULL;
    d->hoverLink        = NULL;
    d->contextLink      = NULL;
    d->firstVisibleRun  = NULL;
    d->lastVisibleRun   = NULL;
    d->visBuf           = new_VisBuf();
    d->invalidRuns      = new_PtrSet();
    init_Anim(&d->sideOpacity, 0);
    init_Anim(&d->altTextOpacity, 0);
    d->sourceStatus = none_GmStatusCode;
    init_String(&d->sourceHeader);
    init_String(&d->sourceMime);
    init_Block(&d->sourceContent, 0);
    iZap(d->sourceTime);
    init_PtrArray(&d->visibleLinks);
    init_PtrArray(&d->visiblePre);
    init_PtrArray(&d->visibleWideRuns);
    init_Array(&d->wideRunOffsets, sizeof(int));
    init_PtrArray(&d->visibleMedia);
    d->grabbedPlayer = NULL;
    d->mediaTimer    = 0;
    init_String(&d->pendingGotoHeading);
    init_Click(&d->click, d, SDL_BUTTON_LEFT);
    addChild_Widget(w, iClob(d->scroll = new_ScrollWidget()));
    d->menu         = NULL; /* created when clicking */
    d->playerMenu   = NULL;
    d->drawBufs     = new_DrawBufs();
    d->translation  = NULL;
    addChildFlags_Widget(w,
                         iClob(new_IndicatorWidget()),
                         resizeToParentWidth_WidgetFlag | resizeToParentHeight_WidgetFlag);
#if !defined (iPlatformAppleDesktop) /* in system menu */
    addAction_Widget(w, reload_KeyShortcut, "navigate.reload");
    addAction_Widget(w, closeTab_KeyShortcut, "tabs.close");
    addAction_Widget(w, SDLK_d, KMOD_PRIMARY, "bookmark.add");
    addAction_Widget(w, subscribeToPage_KeyModifier, "feeds.subscribe");
#endif
    addAction_Widget(w, navigateBack_KeyShortcut, "navigate.back");
    addAction_Widget(w, navigateForward_KeyShortcut, "navigate.forward");
    addAction_Widget(w, navigateParent_KeyShortcut, "navigate.parent");
    addAction_Widget(w, navigateRoot_KeyShortcut, "navigate.root");
}

void deinit_DocumentWidget(iDocumentWidget *d) {
    delete_Translation(d->translation);
    delete_DrawBufs(d->drawBufs);
    delete_VisBuf(d->visBuf);
    delete_PtrSet(d->invalidRuns);
    iRelease(d->media);
    iRelease(d->request);
    deinit_String(&d->pendingGotoHeading);
    deinit_Block(&d->sourceContent);
    deinit_String(&d->sourceMime);
    deinit_String(&d->sourceHeader);
    iRelease(d->doc);
    if (d->mediaTimer) {
        SDL_RemoveTimer(d->mediaTimer);
    }
    deinit_Array(&d->wideRunOffsets);
    deinit_PtrArray(&d->visibleMedia);
    deinit_PtrArray(&d->visibleWideRuns);
    deinit_PtrArray(&d->visiblePre);
    deinit_PtrArray(&d->visibleLinks);
    delete_Block(d->certFingerprint);
    delete_String(d->certSubject);
    delete_String(d->titleUser);
    deinit_PersistentDocumentState(&d->mod);
}

static void enableActions_DocumentWidget_(iDocumentWidget *d, iBool enable) {
    /* Actions are invisible child widgets of the DocumentWidget. */
    iForEach(ObjectList, i, children_Widget(d)) {
        if (isAction_Widget(i.object)) {
            setFlags_Widget(i.object, disabled_WidgetFlag, !enable);
        }
    }
}

static void setLinkNumberMode_DocumentWidget_(iDocumentWidget *d, iBool set) {
    iChangeFlags(d->flags, showLinkNumbers_DocumentWidgetFlag, set);
    /* Children have priority when handling events. */
    enableActions_DocumentWidget_(d, !set);
    if (d->menu) {
        setFlags_Widget(d->menu, disabled_WidgetFlag, set);
    }
}

static void resetWideRuns_DocumentWidget_(iDocumentWidget *d) {
    clear_Array(&d->wideRunOffsets);
    d->animWideRunId = 0;
    init_Anim(&d->animWideRunOffset, 0);
    iZap(d->animWideRunRange);
}

static void requestUpdated_DocumentWidget_(iAnyObject *obj) {
    iDocumentWidget *d = obj;
    const int wasUpdated = exchange_Atomic(&d->isRequestUpdated, iTrue);
    if (!wasUpdated) {
        postCommand_Widget(obj, "document.request.updated doc:%p request:%p", d, d->request);
    }
}

static void requestFinished_DocumentWidget_(iAnyObject *obj) {
    iDocumentWidget *d = obj;
    postCommand_Widget(obj, "document.request.finished doc:%p request:%p", d, d->request);
}

static int documentWidth_DocumentWidget_(const iDocumentWidget *d) {
    const iWidget *w        = constAs_Widget(d);
    const iRect    bounds   = bounds_Widget(w);
    const iPrefs * prefs    = prefs_App();
    const int      minWidth = 50 * gap_UI; /* lines must fit a word at least */
    const float    adjust   = iClamp((float) bounds.size.x / gap_UI / 11 - 12,
                                     -2.0f, 10.0f); /* adapt to width */
    //printf("%f\n", adjust); fflush(stdout);
    return iMini(iMax(minWidth, bounds.size.x - gap_UI * (d->pageMargin + adjust) * 2),
                 fontSize_UI * prefs->lineWidth * prefs->zoomPercent / 100);
}

static iRect documentBounds_DocumentWidget_(const iDocumentWidget *d) {
    const iRect bounds = bounds_Widget(constAs_Widget(d));
    const int   margin = gap_UI * d->pageMargin;
    iRect       rect;
    rect.size.x = documentWidth_DocumentWidget_(d);
    rect.pos.x  = mid_Rect(bounds).x - rect.size.x / 2;
    rect.pos.y  = top_Rect(bounds);
    rect.size.y = height_Rect(bounds) - margin;
    const iGmRun *banner = siteBanner_GmDocument(d->doc);
    if (!banner) {
        rect.pos.y += margin;
        rect.size.y -= margin;
    }
    if (d->flags & centerVertically_DocumentWidgetFlag) {
        const iInt2 docSize = size_GmDocument(d->doc);
        if (docSize.y < rect.size.y) {
            /* Center vertically if short. There is one empty paragraph line's worth of margin
               between the banner and the page contents. */
            const int bannerHeight = banner ? height_Rect(banner->visBounds) : 0;
            int offset = iMax(0, (rect.size.y + margin - docSize.y - bannerHeight -
                                  lineHeight_Text(paragraph_FontId)) / 2);
            rect.pos.y += offset;
            rect.size.y = docSize.y;
        }
    }
    return rect;
}

static iRect siteBannerRect_DocumentWidget_(const iDocumentWidget *d) {
    const iGmRun *banner = siteBanner_GmDocument(d->doc);
    if (!banner) {
        return zero_Rect();
    }
    const iRect docBounds = documentBounds_DocumentWidget_(d);
    const iInt2 origin = addY_I2(topLeft_Rect(docBounds), -value_Anim(&d->scrollY));
    return moved_Rect(banner->visBounds, origin);
}

static iInt2 documentPos_DocumentWidget_(const iDocumentWidget *d, iInt2 pos) {
    return addY_I2(sub_I2(pos, topLeft_Rect(documentBounds_DocumentWidget_(d))),
                   value_Anim(&d->scrollY));
}

static iRangei visibleRange_DocumentWidget_(const iDocumentWidget *d) {
    const int margin = !hasSiteBanner_GmDocument(d->doc) ? gap_UI * d->pageMargin : 0;
    return (iRangei){ value_Anim(&d->scrollY) - margin,
                      value_Anim(&d->scrollY) + height_Rect(bounds_Widget(constAs_Widget(d))) -
                          margin };
}

static void addVisible_DocumentWidget_(void *context, const iGmRun *run) {
    iDocumentWidget *d = context;
    if (~run->flags & decoration_GmRunFlag && !run->mediaId) {
        if (!d->firstVisibleRun) {
            d->firstVisibleRun = run;
        }
        d->lastVisibleRun = run;
    }
    if (run->preId) {
        pushBack_PtrArray(&d->visiblePre, run);
        if (run->flags & wide_GmRunFlag) {
            pushBack_PtrArray(&d->visibleWideRuns, run);
        }
    }
    if (run->mediaType == audio_GmRunMediaType || run->mediaType == download_GmRunMediaType) {
        iAssert(run->mediaId);
        pushBack_PtrArray(&d->visibleMedia, run);
    }
    if (run->linkId) {
        pushBack_PtrArray(&d->visibleLinks, run);
    }
}

static const iGmRun *lastVisibleLink_DocumentWidget_(const iDocumentWidget *d) {
    iReverseConstForEach(PtrArray, i, &d->visibleLinks) {
        const iGmRun *run = i.ptr;
        if (run->flags & decoration_GmRunFlag && run->linkId) {
            return run;
        }
    }
    return NULL;
}

static float normScrollPos_DocumentWidget_(const iDocumentWidget *d) {
    const int docSize = size_GmDocument(d->doc).y;
    if (docSize) {
        return value_Anim(&d->scrollY) / (float) docSize;
    }
    return 0;
}

static int scrollMax_DocumentWidget_(const iDocumentWidget *d) {
    int sm = size_GmDocument(d->doc).y - height_Rect(bounds_Widget(constAs_Widget(d))) +
             (hasSiteBanner_GmDocument(d->doc) ? 1 : 2) * d->pageMargin * gap_UI;
    if (d->phoneToolbar) {
        sm += rootSize_Window(get_Window()).y -
              top_Rect(boundsWithoutVisualOffset_Widget(d->phoneToolbar));
    }
    return sm;
}

static void invalidateLink_DocumentWidget_(iDocumentWidget *d, iGmLinkId id) {
    /* A link has multiple runs associated with it. */
    iConstForEach(PtrArray, i, &d->visibleLinks) {
        const iGmRun *run = i.ptr;
        if (run->linkId == id) {
            insert_PtrSet(d->invalidRuns, run);
        }
    }
}

static void invalidateVisibleLinks_DocumentWidget_(iDocumentWidget *d) {
    iConstForEach(PtrArray, i, &d->visibleLinks) {
        const iGmRun *run = i.ptr;
        if (run->linkId) {
            insert_PtrSet(d->invalidRuns, run);
        }
    }
}

static int runOffset_DocumentWidget_(const iDocumentWidget *d, const iGmRun *run) {
    if (run->preId && run->flags & wide_GmRunFlag) {
        if (d->animWideRunId == run->preId) {
            return -value_Anim(&d->animWideRunOffset);
        }
        const size_t numOffsets = size_Array(&d->wideRunOffsets);
        const int *offsets = constData_Array(&d->wideRunOffsets);
        if (run->preId <= numOffsets) {
            return -offsets[run->preId - 1];
        }
    }
    return 0;
}

static void invalidateWideRunsWithNonzeroOffset_DocumentWidget_(iDocumentWidget *d) {
    iConstForEach(PtrArray, i, &d->visibleWideRuns) {
        const iGmRun *run = i.ptr;
        if (runOffset_DocumentWidget_(d, run)) {
            insert_PtrSet(d->invalidRuns, run);
        }
    }
}

static void animate_DocumentWidget_(void *ticker) {
    iDocumentWidget *d = ticker;
    refresh_Widget(d);
    if (!isFinished_Anim(&d->sideOpacity) || !isFinished_Anim(&d->altTextOpacity)) {
        addTicker_App(animate_DocumentWidget_, d);
    }
}

static void updateHover_DocumentWidget_(iDocumentWidget *d, iInt2 mouse) {
    const iWidget *w            = constAs_Widget(d);
    const iRect    docBounds    = documentBounds_DocumentWidget_(d);
    const iGmRun * oldHoverLink = d->hoverLink;
    d->hoverPre                 = NULL;
    d->hoverLink                = NULL;
    const iInt2 hoverPos = addY_I2(sub_I2(mouse, topLeft_Rect(docBounds)), value_Anim(&d->scrollY));
    if (isHover_Widget(w) && (~d->flags & noHoverWhileScrolling_DocumentWidgetFlag) &&
        (d->state == ready_RequestState || d->state == receivedPartialResponse_RequestState)) {
        iConstForEach(PtrArray, i, &d->visibleLinks) {
            const iGmRun *run = i.ptr;
            /* Click targets are slightly expanded so there are no gaps between links. */
            if (contains_Rect(expanded_Rect(run->bounds, init1_I2(gap_Text / 2)), hoverPos)) {
                d->hoverLink = run;
                break;
            }
        }
    }
    if (d->hoverLink != oldHoverLink) {
        if (oldHoverLink) {
            invalidateLink_DocumentWidget_(d, oldHoverLink->linkId);
        }
        if (d->hoverLink) {
            invalidateLink_DocumentWidget_(d, d->hoverLink->linkId);
        }
        refresh_Widget(w);
    }
    /* Hovering over preformatted blocks. */
    if (isHover_Widget(w)) {
        iConstForEach(PtrArray, j, &d->visiblePre) {
            const iGmRun *run = j.ptr;
            if (contains_Rect(run->bounds, hoverPos)) {
                d->hoverPre    = run;
                d->hoverAltPre = run;
                break;
            }
        }
    }
    if (!d->hoverPre) {
        setValueSpeed_Anim(&d->altTextOpacity, 0.0f, 1.5f);
        if (!isFinished_Anim(&d->altTextOpacity)) {
            animate_DocumentWidget_(d);
        }
    }
    else if (d->hoverPre &&
             preHasAltText_GmDocument(d->doc, d->hoverPre->preId) &&
             ~d->flags & noHoverWhileScrolling_DocumentWidgetFlag) {
        setValueSpeed_Anim(&d->altTextOpacity, 1.0f, 1.5f);
        if (!isFinished_Anim(&d->altTextOpacity)) {
            animate_DocumentWidget_(d);
        }
    }
    if (isHover_Widget(w) && !contains_Widget(constAs_Widget(d->scroll), mouse)) {
        setCursor_Window(get_Window(),
                         d->hoverLink || d->hoverPre ? SDL_SYSTEM_CURSOR_HAND
                                                     : SDL_SYSTEM_CURSOR_IBEAM);
        if (d->hoverLink &&
            linkFlags_GmDocument(d->doc, d->hoverLink->linkId) & permanent_GmLinkFlag) {
            setCursor_Window(get_Window(), SDL_SYSTEM_CURSOR_ARROW); /* not dismissable */
        }
    }
}

static void updateSideOpacity_DocumentWidget_(iDocumentWidget *d, iBool isAnimated) {
    float opacity = 0.0f;
    const iGmRun *banner = siteBanner_GmDocument(d->doc);
    if (banner && bottom_Rect(banner->visBounds) < value_Anim(&d->scrollY)) {
        opacity = 1.0f;
    }
    setValue_Anim(&d->sideOpacity, opacity, isAnimated ? (opacity < 0.5f ? 100 : 200) : 0);
    animate_DocumentWidget_(d);
}

static uint32_t mediaUpdateInterval_DocumentWidget_(const iDocumentWidget *d) {
    if (document_App() != d) {
        return 0;
    }
    static const uint32_t invalidInterval_ = ~0u;
    uint32_t interval = invalidInterval_;
    iConstForEach(PtrArray, i, &d->visibleMedia) {
        const iGmRun *run = i.ptr;
        if (run->mediaType == audio_GmRunMediaType) {
            iPlayer *plr = audioPlayer_Media(media_GmDocument(d->doc), run->mediaId);
            if (flags_Player(plr) & adjustingVolume_PlayerFlag ||
                (isStarted_Player(plr) && !isPaused_Player(plr))) {
                interval = iMin(interval, 1000 / 15);
            }
        }
        else if (run->mediaType == download_GmRunMediaType) {
            interval = iMin(interval, 1000);
        }
    }
    return interval != invalidInterval_ ? interval : 0;
}

static uint32_t postMediaUpdate_DocumentWidget_(uint32_t interval, void *context) {
    /* Called in timer thread; don't access the widget. */
    iUnused(context);
    postCommand_App("media.player.update");
    return interval;
}

static void updateMedia_DocumentWidget_(iDocumentWidget *d) {
    if (document_App() == d) {
        refresh_Widget(d);
        iConstForEach(PtrArray, i, &d->visibleMedia) {
            const iGmRun *run = i.ptr;
            if (run->mediaType == audio_GmRunMediaType) {
                iPlayer *plr = audioPlayer_Media(media_GmDocument(d->doc), run->mediaId);
                if (idleTimeMs_Player(plr) > 3000 && ~flags_Player(plr) & volumeGrabbed_PlayerFlag &&
                    flags_Player(plr) & adjustingVolume_PlayerFlag) {
                    setFlags_Player(plr, adjustingVolume_PlayerFlag, iFalse);
                }
            }
        }
    }
    if (d->mediaTimer && mediaUpdateInterval_DocumentWidget_(d) == 0) {
        SDL_RemoveTimer(d->mediaTimer);
        d->mediaTimer = 0;
    }
}

static void animateMedia_DocumentWidget_(iDocumentWidget *d) {
    if (document_App() != d) {
        if (d->mediaTimer) {
            SDL_RemoveTimer(d->mediaTimer);
            d->mediaTimer = 0;
        }
        return;
    }
    uint32_t interval = mediaUpdateInterval_DocumentWidget_(d);
    if (interval && !d->mediaTimer) {
        d->mediaTimer = SDL_AddTimer(interval, postMediaUpdate_DocumentWidget_, d);
    }
}

static iRangecc currentHeading_DocumentWidget_(const iDocumentWidget *d) {
    iRangecc heading = iNullRange;
    if (d->firstVisibleRun) {
        iConstForEach(Array, i, headings_GmDocument(d->doc)) {
            const iGmHeading *head = i.value;
            if (head->level == 0) {
                if (head->text.start <= d->firstVisibleRun->text.start) {
                    heading = head->text;
                }
                if (d->lastVisibleRun && head->text.start > d->lastVisibleRun->text.start) {
                    break;
                }
            }
        }
    }
    return heading;
}

static void updateVisible_DocumentWidget_(iDocumentWidget *d) {
    iChangeFlags(d->flags,
                 centerVertically_DocumentWidgetFlag,
                 prefs_App()->centerShortDocs || startsWithCase_String(d->mod.url, "about:") ||
                     !isSuccess_GmStatusCode(d->sourceStatus));
    const iRangei visRange = visibleRange_DocumentWidget_(d);
    const iRect   bounds   = bounds_Widget(as_Widget(d));
    setRange_ScrollWidget(d->scroll, (iRangei){ 0, scrollMax_DocumentWidget_(d) });
    const int docSize = size_GmDocument(d->doc).y;
    setThumb_ScrollWidget(d->scroll,
                          value_Anim(&d->scrollY),
                          docSize > 0 ? height_Rect(bounds) * size_Range(&visRange) / docSize : 0);
    clear_PtrArray(&d->visibleLinks);
    clear_PtrArray(&d->visibleWideRuns);
    clear_PtrArray(&d->visiblePre);
    clear_PtrArray(&d->visibleMedia);
    const iRangecc oldHeading = currentHeading_DocumentWidget_(d);
    /* Scan for visible runs. */ {
        d->firstVisibleRun = NULL;
        render_GmDocument(d->doc, visRange, addVisible_DocumentWidget_, d);
    }
    const iRangecc newHeading = currentHeading_DocumentWidget_(d);
    if (memcmp(&oldHeading, &newHeading, sizeof(oldHeading))) {
        d->drawBufs->flags |= updateSideBuf_DrawBufsFlag;
    }
    updateHover_DocumentWidget_(d, mouseCoord_Window(get_Window()));
    updateSideOpacity_DocumentWidget_(d, iTrue);
    animateMedia_DocumentWidget_(d);
    /* Remember scroll positions of recently visited pages. */ {
        iRecentUrl *recent = mostRecentUrl_History(d->mod.history);
        if (recent && docSize && d->state == ready_RequestState) {
            recent->normScrollY = normScrollPos_DocumentWidget_(d);
        }
    }
}

static void updateWindowTitle_DocumentWidget_(const iDocumentWidget *d) {
    iLabelWidget *tabButton = tabPageButton_Widget(findWidget_App("doctabs"), d);
    if (!tabButton) {
        /* Not part of the UI at the moment. */
        return;
    }
    iStringArray *title = iClob(new_StringArray());
    if (!isEmpty_String(title_GmDocument(d->doc))) {
        pushBack_StringArray(title, title_GmDocument(d->doc));
    }
    if (!isEmpty_String(d->titleUser)) {
        pushBack_StringArray(title, d->titleUser);
    }
    else {
        iUrl parts;
        init_Url(&parts, d->mod.url);
        if (equalCase_Rangecc(parts.scheme, "about")) {
            if (!findWidget_App("winbar")) {
                pushBackCStr_StringArray(title, "Lagrange");
            }
        }
        else if (!isEmpty_Range(&parts.host)) {
            pushBackRange_StringArray(title, parts.host);
        }
    }
    if (isEmpty_StringArray(title)) {
        pushBackCStr_StringArray(title, "Lagrange");
    }
    /* Take away parts if it doesn't fit. */
    const int avail = bounds_Widget(as_Widget(tabButton)).size.x - 3 * gap_UI;
    iBool setWindow = (document_App() == d);
    for (;;) {
        iString *text = collect_String(joinCStr_StringArray(title, " \u2014 "));
        if (setWindow) {
            /* Longest version for the window title, and omit the icon. */
            setTitle_Window(get_Window(), text);
            setWindow = iFalse;
        }
        const iChar siteIcon = siteIcon_GmDocument(d->doc);
        if (siteIcon) {
            if (!isEmpty_String(text)) {
                prependCStr_String(text, "  " restore_ColorEscape);
            }
            prependChar_String(text, siteIcon);
            prependCStr_String(text, escape_Color(uiIcon_ColorId));
        }
        const int width = advanceRange_Text(default_FontId, range_String(text)).x;
        if (width <= avail ||
            isEmpty_StringArray(title)) {
            updateText_LabelWidget(tabButton, text);
            break;
        }
        if (size_StringArray(title) == 1) {
            /* Just truncate to fit. */
            const char *endPos;
            tryAdvanceNoWrap_Text(default_FontId,
                                  range_String(text),
                                  avail - advance_Text(default_FontId, "...").x,
                                  &endPos);
            updateText_LabelWidget(
                tabButton,
                collectNewFormat_String(
                    "%s...", cstr_Rangecc((iRangecc){ constBegin_String(text), endPos })));
            break;
        }
        remove_StringArray(title, size_StringArray(title) - 1);
    }
}

static void updateTimestampBuf_DocumentWidget_(const iDocumentWidget *d) {
    if (!isExposed_Window(get_Window())) {
        return;
    }
    if (d->drawBufs->timestampBuf) {
        delete_TextBuf(d->drawBufs->timestampBuf);
        d->drawBufs->timestampBuf = NULL;
    }
    if (isValid_Time(&d->sourceTime)) {
        d->drawBufs->timestampBuf = new_TextBuf(
            uiLabel_FontId,
            white_ColorId,
            cstrCollect_String(format_Time(&d->sourceTime, cstr_Lang("page.timestamp"))));
    }
    d->drawBufs->flags &= ~updateTimestampBuf_DrawBufsFlag;
}

static void invalidate_DocumentWidget_(iDocumentWidget *d) {
    invalidate_VisBuf(d->visBuf);
    clear_PtrSet(d->invalidRuns);
}

static iRangecc bannerText_DocumentWidget_(const iDocumentWidget *d) {
    return isEmpty_String(d->titleUser) ? range_String(bannerText_GmDocument(d->doc))
                                        : range_String(d->titleUser);
}

static void documentRunsInvalidated_DocumentWidget_(iDocumentWidget *d) {
    d->foundMark       = iNullRange;
    d->selectMark      = iNullRange;
    d->hoverPre        = NULL;
    d->hoverAltPre     = NULL;
    d->hoverLink       = NULL;
    d->contextLink     = NULL;
    d->firstVisibleRun = NULL;
    d->lastVisibleRun  = NULL;
}

void setSource_DocumentWidget(iDocumentWidget *d, const iString *source) {
    setUrl_GmDocument(d->doc, d->mod.url);
    setSource_GmDocument(d->doc, source, documentWidth_DocumentWidget_(d));
    documentRunsInvalidated_DocumentWidget_(d);
    updateWindowTitle_DocumentWidget_(d);
    updateVisible_DocumentWidget_(d);
    d->drawBufs->flags |= updateSideBuf_DrawBufsFlag;
    invalidate_DocumentWidget_(d);
    refresh_Widget(as_Widget(d));
}

static void updateTheme_DocumentWidget_(iDocumentWidget *d) {
    if (isEmpty_String(d->titleUser)) {
        setThemeSeed_GmDocument(d->doc,
                                collect_Block(newRange_Block(urlHost_String(d->mod.url))));
    }
    else {
        setThemeSeed_GmDocument(d->doc, &d->titleUser->chars);
    }
    d->drawBufs->flags |= updateTimestampBuf_DrawBufsFlag;
}

static enum iGmDocumentBanner bannerType_DocumentWidget_(const iDocumentWidget *d) {
    if (d->certFlags & available_GmCertFlag) {
        const int req = domainVerified_GmCertFlag | timeVerified_GmCertFlag | trusted_GmCertFlag;
        if ((d->certFlags & req) != req) {
            return certificateWarning_GmDocumentBanner;
        }
    }
    return siteDomain_GmDocumentBanner;
}

static void showErrorPage_DocumentWidget_(iDocumentWidget *d, enum iGmStatusCode code,
                                          const iString *meta) {
    iString *src = collectNewCStr_String("# ");
    const iGmError *msg = get_GmError(code);
    appendChar_String(src, msg->icon ? msg->icon : 0x2327); /* X in a box */
    appendFormat_String(src, " %s\n%s", msg->title, msg->info);
    iBool useBanner = iTrue;
    if (meta) {
        switch (code) {
            case schemeChangeRedirect_GmStatusCode:
            case tooManyRedirects_GmStatusCode:
                appendFormat_String(src, "\n=> %s\n", cstr_String(meta));
                break;
            case tlsFailure_GmStatusCode:
                useBanner = iFalse; /* valid data wasn't received from host */
                appendFormat_String(src, "\n\n>%s\n", cstr_String(meta));
                break;
            case failedToOpenFile_GmStatusCode:
            case certificateNotValid_GmStatusCode:
                appendFormat_String(src, "\n\n%s", cstr_String(meta));
                break;
            case unsupportedMimeType_GmStatusCode: {
                iString *key = collectNew_String();
                toString_Sym(SDLK_s, KMOD_PRIMARY, key);
                appendFormat_String(src, "\n```\n%s\n```\n", cstr_String(meta));
                appendFormat_String(src,
                                    cstr_Lang("error.unsupported.suggestsave"),
                                    cstr_String(key),
                                    saveToDownloads_Label);
                break;
            }
            case slowDown_GmStatusCode:
                appendFormat_String(src, "\n\nWait %s seconds before your next request.",
                                    cstr_String(meta));
                break;
            default:
                break;
        }
    }
    setBanner_GmDocument(d->doc, useBanner ? bannerType_DocumentWidget_(d) : none_GmDocumentBanner);
    setFormat_GmDocument(d->doc, gemini_GmDocumentFormat);
    translate_Lang(src);
    setSource_DocumentWidget(d, src);
    updateTheme_DocumentWidget_(d);
    init_Anim(&d->scrollY, 0);
    init_Anim(&d->sideOpacity, 0);
    init_Anim(&d->altTextOpacity, 0);
    resetWideRuns_DocumentWidget_(d);
    d->state = ready_RequestState;
}

static void updateFetchProgress_DocumentWidget_(iDocumentWidget *d) {
    iLabelWidget *prog   = findWidget_App("document.progress");
    const size_t  dlSize = d->request ? bodySize_GmRequest(d->request) : 0;
    showCollapsed_Widget(as_Widget(prog), dlSize >= 250000);
    if (isVisible_Widget(prog)) {
        updateText_LabelWidget(prog,
                               collectNewFormat_String("%s%.3f ${mb}",
                                                       isFinished_GmRequest(d->request)
                                                           ? uiHeading_ColorEscape
                                                           : uiTextCaution_ColorEscape,
                                                       dlSize / 1.0e6f));
    }
}

static void updateDocument_DocumentWidget_(iDocumentWidget *d, const iGmResponse *response,
                                           const iBool isInitialUpdate) {
    if (d->state == ready_RequestState) {
        return;
    }
    const iBool isRequestFinished = !d->request || isFinished_GmRequest(d->request);
    /* TODO: Do document update in the background. However, that requires a text metrics calculator
       that does not try to cache the glyph bitmaps. */
    const enum iGmStatusCode statusCode = response->statusCode;
    if (category_GmStatusCode(statusCode) != categoryInput_GmStatusCode) {
        iBool setSource = iTrue;
        iString str;
        invalidate_DocumentWidget_(d);
        if (document_App() == d) {
            updateTheme_DocumentWidget_(d);
        }
        clear_String(&d->sourceMime);
        d->sourceTime = response->when;
        d->drawBufs->flags |= updateTimestampBuf_DrawBufsFlag;
        initBlock_String(&str, &response->body);
        if (isSuccess_GmStatusCode(statusCode)) {
            /* Check the MIME type. */
            iRangecc charset = range_CStr("utf-8");
            enum iGmDocumentFormat docFormat = undefined_GmDocumentFormat;
            const iString *mimeStr = collect_String(lower_String(&response->meta)); /* for convenience */
            set_String(&d->sourceMime, mimeStr);
            iRangecc mime = range_String(mimeStr);
            iRangecc seg = iNullRange;
            while (nextSplit_Rangecc(mime, ";", &seg)) {
                iRangecc param = seg;
                trim_Rangecc(&param);
                if (equal_Rangecc(param, "text/gemini")) {
                    docFormat = gemini_GmDocumentFormat;
                    setRange_String(&d->sourceMime, param);
                }
                else if (startsWith_Rangecc(param, "text/") ||
                         equal_Rangecc(param, "application/json")) {
                    docFormat = plainText_GmDocumentFormat;
                    setRange_String(&d->sourceMime, param);
                }
                else if (startsWith_Rangecc(param, "image/") ||
                         startsWith_Rangecc(param, "audio/")) {
                    const iBool isAudio = startsWith_Rangecc(param, "audio/");
                    /* Make a simple document with an image or audio player. */
                    docFormat = gemini_GmDocumentFormat;
                    setRange_String(&d->sourceMime, param);
                    if ((isAudio && isInitialUpdate) || (!isAudio && isRequestFinished)) {
                        const char *linkTitle =
                            startsWith_String(mimeStr, "image/") ? "Image" : "Audio";
                        iUrl parts;
                        init_Url(&parts, d->mod.url);
                        if (!isEmpty_Range(&parts.path)) {
                            linkTitle =
                                baseName_Path(collect_String(newRange_String(parts.path))).start;
                        }
                        format_String(&str, "=> %s %s\n", cstr_String(d->mod.url), linkTitle);
                        setData_Media(media_GmDocument(d->doc),
                                      1,
                                      mimeStr,
                                      &response->body,
                                      !isRequestFinished ? partialData_MediaFlag : 0);
                        redoLayout_GmDocument(d->doc);
                    }
                    else if (isAudio && !isInitialUpdate) {
                        /* Update the audio content. */
                        setData_Media(media_GmDocument(d->doc),
                                      1,
                                      mimeStr,
                                      &response->body,
                                      !isRequestFinished ? partialData_MediaFlag : 0);
                        refresh_Widget(d);
                        setSource = iFalse;
                    }
                    else {
                        clear_String(&str);
                    }
                }
                else if (startsWith_Rangecc(param, "charset=")) {
                    charset = (iRangecc){ param.start + 8, param.end };
                    /* Remove whitespace and quotes. */
                    trim_Rangecc(&charset);
                    if (*charset.start == '"' && *charset.end == '"') {
                        charset.start++;
                        charset.end--;
                    }
                }
            }
            if (docFormat == undefined_GmDocumentFormat) {
                showErrorPage_DocumentWidget_(d, unsupportedMimeType_GmStatusCode, &response->meta);
                deinit_String(&str);
                return;
            }
            setFormat_GmDocument(d->doc, docFormat);
            /* Convert the source to UTF-8 if needed. */
            if (!equalCase_Rangecc(charset, "utf-8")) {
                set_String(&str,
                           collect_String(decode_Block(&str.chars, cstr_Rangecc(charset))));
            }
        }
        if (setSource) {
            setSource_DocumentWidget(d, &str);
        }
        deinit_String(&str);
    }
}

static void fetch_DocumentWidget_(iDocumentWidget *d) {
    /* Forget the previous request. */
    if (d->request) {
        iRelease(d->request);
        d->request = NULL;
    }
    postCommandf_App("document.request.started doc:%p url:%s", d, cstr_String(d->mod.url));
    clear_ObjectList(d->media);
    d->certFlags = 0;
    setLinkNumberMode_DocumentWidget_(d, iFalse);
    d->state = fetching_RequestState;
    set_Atomic(&d->isRequestUpdated, iFalse);
    d->request = new_GmRequest(certs_App());
    setUrl_GmRequest(d->request, d->mod.url);
    iConnect(GmRequest, d->request, updated, d, requestUpdated_DocumentWidget_);
    iConnect(GmRequest, d->request, finished, d, requestFinished_DocumentWidget_);
    submit_GmRequest(d->request);
}

static void updateTrust_DocumentWidget_(iDocumentWidget *d, const iGmResponse *response) {
    if (response) {
        d->certFlags  = response->certFlags;
        d->certExpiry = response->certValidUntil;
        set_Block(d->certFingerprint, &response->certFingerprint);
        set_String(d->certSubject, &response->certSubject);
    }
    iLabelWidget *lock = findWidget_App("navbar.lock");
    if (~d->certFlags & available_GmCertFlag) {
        setFlags_Widget(as_Widget(lock), disabled_WidgetFlag, iTrue);
        updateTextCStr_LabelWidget(lock, gray50_ColorEscape openLock_Icon);
        return;
    }
    setFlags_Widget(as_Widget(lock), disabled_WidgetFlag, iFalse);
    const iBool isDarkMode = isDark_ColorTheme(colorTheme_App());
    if (~d->certFlags & domainVerified_GmCertFlag) {
        updateTextCStr_LabelWidget(lock, red_ColorEscape warning_Icon);
    }
    else if (d->certFlags & trusted_GmCertFlag) {
        updateTextCStr_LabelWidget(lock, green_ColorEscape closedLock_Icon);
    }
    else {
        updateTextCStr_LabelWidget(lock, isDarkMode ? orange_ColorEscape warning_Icon
            : black_ColorEscape warning_Icon);
    }
    setBanner_GmDocument(d->doc, bannerType_DocumentWidget_(d));
}

static void parseUser_DocumentWidget_(iDocumentWidget *d) {
    setRange_String(d->titleUser, urlUser_String(d->mod.url));
}

static void cacheRunGlyphs_(void *data, const iGmRun *run) {
    iUnused(data);
    if (!isEmpty_Range(&run->text)) {
        cache_Text(run->font, run->text);
    }
}

static void cacheDocumentGlyphs_DocumentWidget_(const iDocumentWidget *d) {
    if (isExposed_Window(get_Window())) {
        render_GmDocument(d->doc, (iRangei){ 0, size_GmDocument(d->doc).y }, cacheRunGlyphs_, NULL);
    }
}

static iBool updateFromHistory_DocumentWidget_(iDocumentWidget *d) {
    const iRecentUrl *recent = findUrl_History(d->mod.history, d->mod.url);
    if (recent && recent->cachedResponse) {
        const iGmResponse *resp = recent->cachedResponse;
        clear_ObjectList(d->media);
        reset_GmDocument(d->doc);
        d->state = fetching_RequestState;
        d->initNormScrollY = recent->normScrollY;
        resetWideRuns_DocumentWidget_(d);
        /* Use the cached response data. */
        updateTrust_DocumentWidget_(d, resp);
        d->sourceTime = resp->when;
        d->sourceStatus = success_GmStatusCode;
        format_String(&d->sourceHeader, cstr_Lang("pageinfo.header.cached"));
        d->drawBufs->flags |= updateTimestampBuf_DrawBufsFlag;
        set_Block(&d->sourceContent, &resp->body);
        updateDocument_DocumentWidget_(d, resp, iTrue);
        init_Anim(&d->scrollY, d->initNormScrollY * size_GmDocument(d->doc).y);
        init_Anim(&d->altTextOpacity, 0);
        d->state = ready_RequestState;
        updateSideOpacity_DocumentWidget_(d, iFalse);
        d->drawBufs->flags |= updateSideBuf_DrawBufsFlag;
        updateVisible_DocumentWidget_(d);
        cacheDocumentGlyphs_DocumentWidget_(d);
        postCommandf_App("document.changed doc:%p url:%s", d, cstr_String(d->mod.url));
        return iTrue;
    }
    else if (!isEmpty_String(d->mod.url)) {
        fetch_DocumentWidget_(d);
    }
    return iFalse;
}

static void refreshWhileScrolling_DocumentWidget_(iAny *ptr) {
    iDocumentWidget *d = ptr;
    updateVisible_DocumentWidget_(d);
    refresh_Widget(d);
    if (d->animWideRunId) {
        for (const iGmRun *r = d->animWideRunRange.start; r != d->animWideRunRange.end; r++) {
            insert_PtrSet(d->invalidRuns, r);
        }
    }
    if (isFinished_Anim(&d->animWideRunOffset)) {
        d->animWideRunId = 0;
    }
    if (!isFinished_Anim(&d->scrollY) || !isFinished_Anim(&d->animWideRunOffset)) {
        addTicker_App(refreshWhileScrolling_DocumentWidget_, d);
    }
}

static void smoothScroll_DocumentWidget_(iDocumentWidget *d, int offset, int duration) {
    /* Get rid of link numbers when scrolling. */
    if (offset && d->flags & showLinkNumbers_DocumentWidgetFlag) {
        setLinkNumberMode_DocumentWidget_(d, iFalse);
        invalidateVisibleLinks_DocumentWidget_(d);
    }
    /* Show and hide toolbar on scroll. */
    if (deviceType_App() == phone_AppDeviceType) {
        if (prefs_App()->hideToolbarOnScroll && iAbs(offset) > 5) {
            showToolbars_Window(get_Window(), offset < 0);
        }
    }
    if (!prefs_App()->smoothScrolling) {
        duration = 0; /* always instant */
    }
    int destY = targetValue_Anim(&d->scrollY) + offset;
    if (destY < 0) {
        destY = 0;
    }
    const int scrollMax = scrollMax_DocumentWidget_(d);
    if (scrollMax > 0) {
        destY = iMin(destY, scrollMax);
    }
    else {
        destY = 0;
    }
    if (duration) {
        setValueEased_Anim(&d->scrollY, destY, duration);
    }
    else {
        setValue_Anim(&d->scrollY, destY, 0);
    }
    updateVisible_DocumentWidget_(d);
    refresh_Widget(as_Widget(d));
    if (duration > 0) {
        iChangeFlags(d->flags, noHoverWhileScrolling_DocumentWidgetFlag, iTrue);
        addTicker_App(refreshWhileScrolling_DocumentWidget_, d);
    }
}

static void scroll_DocumentWidget_(iDocumentWidget *d, int offset) {
    smoothScroll_DocumentWidget_(d, offset, 0 /* instantly */);
}

static void scrollTo_DocumentWidget_(iDocumentWidget *d, int documentY, iBool centered) {
    if (!hasSiteBanner_GmDocument(d->doc)) {
        documentY += d->pageMargin * gap_UI;
    }
    init_Anim(&d->scrollY,
              documentY - (centered ? documentBounds_DocumentWidget_(d).size.y / 2
                                    : lineHeight_Text(paragraph_FontId)));
    scroll_DocumentWidget_(d, 0); /* clamp it */
}

static void scrollToHeading_DocumentWidget_(iDocumentWidget *d, const char *heading) {
    iConstForEach(Array, h, headings_GmDocument(d->doc)) {
        const iGmHeading *head = h.value;
        if (startsWithCase_Rangecc(head->text, heading)) {
            postCommandf_App("document.goto loc:%p", head->text.start);
            break;
        }
    }
}

static void scrollWideBlock_DocumentWidget_(iDocumentWidget *d, iInt2 mousePos, int delta,
                                            int duration) {
    if (delta == 0) {
        return;
    }
    const iInt2 docPos = documentPos_DocumentWidget_(d, mousePos);
    iConstForEach(PtrArray, i, &d->visibleWideRuns) {
        const iGmRun *run = i.ptr;
        if (docPos.y >= top_Rect(run->bounds) && docPos.y <= bottom_Rect(run->bounds)) {
            /* We can scroll this run. First find out how much is allowed. */
            const iGmRunRange range = findPreformattedRange_GmDocument(d->doc, run);
            int maxWidth = 0;
            for (const iGmRun *r = range.start; r != range.end; r++) {
                maxWidth = iMax(maxWidth, width_Rect(r->visBounds));
            }
            const int maxOffset = maxWidth - documentWidth_DocumentWidget_(d) + d->pageMargin * gap_UI;
            if (size_Array(&d->wideRunOffsets) <= run->preId) {
                resize_Array(&d->wideRunOffsets, run->preId + 1);
            }
            int *offset = at_Array(&d->wideRunOffsets, run->preId - 1);
            const int oldOffset = *offset;
            *offset = iClamp(*offset + delta, 0, maxOffset);
            /* Make sure the whole block gets redraw. */
            if (oldOffset != *offset) {
                for (const iGmRun *r = range.start; r != range.end; r++) {
                    insert_PtrSet(d->invalidRuns, r);
                }
                refresh_Widget(d);
                d->selectMark = iNullRange;
                d->foundMark  = iNullRange;
            }
            if (duration) {
                if (d->animWideRunId != run->preId || isFinished_Anim(&d->animWideRunOffset)) {
                    d->animWideRunId = run->preId;
                    init_Anim(&d->animWideRunOffset, oldOffset);
                }
                setValueEased_Anim(&d->animWideRunOffset, *offset, duration);
                d->animWideRunRange = range;
                addTicker_App(refreshWhileScrolling_DocumentWidget_, d);
            }
            else {
                d->animWideRunId = 0;
                init_Anim(&d->animWideRunOffset, 0);
            }
            break;
        }
    }
}

static void togglePreFold_DocumentWidget_(iDocumentWidget *d, uint16_t preId) {
    d->hoverPre    = NULL;
    d->hoverAltPre = NULL;
    d->selectMark  = iNullRange;
    foldPre_GmDocument(d->doc, preId);
    redoLayout_GmDocument(d->doc);
    scroll_DocumentWidget_(d, 0);
    updateHover_DocumentWidget_(d, mouseCoord_Window(get_Window()));
    invalidate_DocumentWidget_(d);
    refresh_Widget(as_Widget(d));
}

static void checkResponse_DocumentWidget_(iDocumentWidget *d) {
    if (!d->request) {
        return;
    }
    enum iGmStatusCode statusCode = status_GmRequest(d->request);
    if (statusCode == none_GmStatusCode) {
        return;
    }
    iGmResponse *resp = lockResponse_GmRequest(d->request);
    if (d->state == fetching_RequestState) {
        d->state = receivedPartialResponse_RequestState;
        updateTrust_DocumentWidget_(d, resp);
        init_Anim(&d->sideOpacity, 0);
        init_Anim(&d->altTextOpacity, 0);
        format_String(&d->sourceHeader, "%d %s", statusCode, get_GmError(statusCode)->title);
        d->sourceStatus = statusCode;
        switch (category_GmStatusCode(statusCode)) {
            case categoryInput_GmStatusCode: {
                iUrl parts;
                init_Url(&parts, d->mod.url);
                iWidget *dlg = makeValueInput_Widget(
                    as_Widget(d),
                    NULL,
                    format_CStr(uiHeading_ColorEscape "%s", cstr_Rangecc(parts.host)),
                    isEmpty_String(&resp->meta)
                        ? format_CStr(cstr_Lang("dlg.input.prompt"), cstr_Rangecc(parts.path))
                        : cstr_String(&resp->meta),
                    uiTextCaution_ColorEscape "${dlg.input.send} \u21d2",
                    format_CStr("!document.input.submit doc:%p", d));
                setSensitiveContent_InputWidget(findChild_Widget(dlg, "input"),
                                                statusCode == sensitiveInput_GmStatusCode);
                if (document_App() != d) {
                    postCommandf_App("tabs.switch page:%p", d);
                }
                break;
            }
            case categorySuccess_GmStatusCode:
                init_Anim(&d->scrollY, 0);
                reset_GmDocument(d->doc); /* new content incoming */
                resetWideRuns_DocumentWidget_(d);
                updateDocument_DocumentWidget_(d, resp, iTrue);
                break;
            case categoryRedirect_GmStatusCode:
                if (isEmpty_String(&resp->meta)) {
                    showErrorPage_DocumentWidget_(d, invalidRedirect_GmStatusCode, NULL);
                }
                else {
                    /* Only accept redirects that use gemini scheme. */
                    const iString *dstUrl = absoluteUrl_String(d->mod.url, &resp->meta);
                    if (d->redirectCount >= 5) {
                        showErrorPage_DocumentWidget_(d, tooManyRedirects_GmStatusCode, dstUrl);
                    }
                    else if (equalCase_Rangecc(urlScheme_String(dstUrl),
                                               cstr_Rangecc(urlScheme_String(d->mod.url)))) {
                        /* Redirects with the same scheme are automatic. */
                        visitUrl_Visited(visited_App(), d->mod.url, transient_VisitedUrlFlag);
                        postCommandf_App(
                            "open doc:%p redirect:%d url:%s", d, d->redirectCount + 1, cstr_String(dstUrl));
                    }
                    else {
                        /* Scheme changes must be manually approved. */
                        showErrorPage_DocumentWidget_(d, schemeChangeRedirect_GmStatusCode, dstUrl);
                    }
                    unlockResponse_GmRequest(d->request);
                    iReleasePtr(&d->request);
                }
                break;
            default:
                if (isDefined_GmError(statusCode)) {
                    showErrorPage_DocumentWidget_(d, statusCode, &resp->meta);
                }
                else if (category_GmStatusCode(statusCode) ==
                         categoryTemporaryFailure_GmStatusCode) {
                    showErrorPage_DocumentWidget_(
                        d, temporaryFailure_GmStatusCode, &resp->meta);
                }
                else if (category_GmStatusCode(statusCode) ==
                         categoryPermanentFailure_GmStatusCode) {
                    showErrorPage_DocumentWidget_(
                        d, permanentFailure_GmStatusCode, &resp->meta);
                }
                else {
                    showErrorPage_DocumentWidget_(d, unknownStatusCode_GmStatusCode, &resp->meta);
                }
                break;
        }
    }
    else if (d->state == receivedPartialResponse_RequestState) {
        switch (category_GmStatusCode(statusCode)) {
            case categorySuccess_GmStatusCode:
                /* More content available. */
                updateDocument_DocumentWidget_(d, resp, iFalse);
                break;
            default:
                break;
        }
    }
    unlockResponse_GmRequest(d->request);
}

static iRangecc sourceLoc_DocumentWidget_(const iDocumentWidget *d, iInt2 pos) {
    return findLoc_GmDocument(d->doc, documentPos_DocumentWidget_(d, pos));
}

iDeclareType(MiddleRunParams)

struct Impl_MiddleRunParams {
    int midY;
    const iGmRun *closest;
    int distance;
};

static void find_MiddleRunParams_(void *params, const iGmRun *run) {
    iMiddleRunParams *d = params;
    if (isEmpty_Rect(run->bounds)) {
        return;
    }
    const int distance = iAbs(mid_Rect(run->bounds).y - d->midY);
    if (!d->closest || distance < d->distance) {
        d->closest  = run;
        d->distance = distance;
    }
}

static const iGmRun *middleRun_DocumentWidget_(const iDocumentWidget *d) {
    iRangei visRange = visibleRange_DocumentWidget_(d);
    iMiddleRunParams params = { (visRange.start + visRange.end) / 2, NULL, 0 };
    render_GmDocument(d->doc, visRange, find_MiddleRunParams_, &params);
    return params.closest;
}

static void removeMediaRequest_DocumentWidget_(iDocumentWidget *d, iGmLinkId linkId) {
    iForEach(ObjectList, i, d->media) {
        iMediaRequest *req = (iMediaRequest *) i.object;
        if (req->linkId == linkId) {
            remove_ObjectListIterator(&i);
            break;
        }
    }
}

static iMediaRequest *findMediaRequest_DocumentWidget_(const iDocumentWidget *d, iGmLinkId linkId) {
    iConstForEach(ObjectList, i, d->media) {
        const iMediaRequest *req = (const iMediaRequest *) i.object;
        if (req->linkId == linkId) {
            return iConstCast(iMediaRequest *, req);
        }
    }
    return NULL;
}

static iBool requestMedia_DocumentWidget_(iDocumentWidget *d, iGmLinkId linkId, iBool enableFilters) {
    if (!findMediaRequest_DocumentWidget_(d, linkId)) {
        const iString *mediaUrl = absoluteUrl_String(d->mod.url, linkUrl_GmDocument(d->doc, linkId));
        pushBack_ObjectList(d->media, iClob(new_MediaRequest(d, linkId, mediaUrl, enableFilters)));
        invalidate_DocumentWidget_(d);
        return iTrue;
    }
    return iFalse;
}

static iBool isDownloadRequest_DocumentWidget(const iDocumentWidget *d, const iMediaRequest *req) {
    return findLinkDownload_Media(constMedia_GmDocument(d->doc), req->linkId) != 0;
}

static iBool handleMediaCommand_DocumentWidget_(iDocumentWidget *d, const char *cmd) {
    iMediaRequest *req = pointerLabel_Command(cmd, "request");
    iBool isOurRequest = iFalse;
    /* This request may already be deleted so treat the pointer with caution. */
    iConstForEach(ObjectList, m, d->media) {
        if (m.object == req) {
            isOurRequest = iTrue;
            break;
        }
    }
    if (!isOurRequest) {
        return iFalse;
    }
    if (equal_Command(cmd, "media.updated")) {
        /* Pass new data to media players. */
        const enum iGmStatusCode code = status_GmRequest(req->req);
        if (isSuccess_GmStatusCode(code)) {
            iGmResponse *resp = lockResponse_GmRequest(req->req);
            if (isDownloadRequest_DocumentWidget(d, req) ||
                startsWith_String(&resp->meta, "audio/")) {
                /* TODO: Use a helper? This is same as below except for the partialData flag. */
                if (setData_Media(media_GmDocument(d->doc),
                                  req->linkId,
                                  &resp->meta,
                                  &resp->body,
                                  partialData_MediaFlag | allowHide_MediaFlag)) {
                    redoLayout_GmDocument(d->doc);
                }
                updateVisible_DocumentWidget_(d);
                invalidate_DocumentWidget_(d);
                refresh_Widget(as_Widget(d));
            }
            unlockResponse_GmRequest(req->req);
        }
        /* Update the link's progress. */
        invalidateLink_DocumentWidget_(d, req->linkId);
        refresh_Widget(d);
        return iTrue;
    }
    else if (equal_Command(cmd, "media.finished")) {
        const enum iGmStatusCode code = status_GmRequest(req->req);
        /* Give the media to the document for presentation. */
        if (isSuccess_GmStatusCode(code)) {
            if (isDownloadRequest_DocumentWidget(d, req) ||
                startsWith_String(meta_GmRequest(req->req), "image/") ||
                startsWith_String(meta_GmRequest(req->req), "audio/")) {
                setData_Media(media_GmDocument(d->doc),
                              req->linkId,
                              meta_GmRequest(req->req),
                              body_GmRequest(req->req),
                              allowHide_MediaFlag);
                redoLayout_GmDocument(d->doc);
                updateVisible_DocumentWidget_(d);
                invalidate_DocumentWidget_(d);
                refresh_Widget(as_Widget(d));
            }
        }
        else {
            const iGmError *err = get_GmError(code);
            makeMessage_Widget(format_CStr(uiTextCaution_ColorEscape "%s", err->title), err->info);
            removeMediaRequest_DocumentWidget_(d, req->linkId);
        }
        return iTrue;
    }
    return iFalse;
}

static void allocVisBuffer_DocumentWidget_(const iDocumentWidget *d) {
    const iWidget *w         = constAs_Widget(d);
    const iBool    isVisible = isVisible_Widget(w);
    const iInt2    size      = bounds_Widget(w).size;
    if (isVisible) {
        alloc_VisBuf(d->visBuf, size, 1);
    }
    else {
        dealloc_VisBuf(d->visBuf);
    }
}

static iBool fetchNextUnfetchedImage_DocumentWidget_(iDocumentWidget *d) {
    iConstForEach(PtrArray, i, &d->visibleLinks) {
        const iGmRun *run = i.ptr;
        if (run->linkId && run->mediaType == none_GmRunMediaType &&
            ~run->flags & decoration_GmRunFlag) {
            const int linkFlags = linkFlags_GmDocument(d->doc, run->linkId);
            if (isMediaLink_GmDocument(d->doc, run->linkId) &&
                linkFlags & imageFileExtension_GmLinkFlag &&
                ~linkFlags & content_GmLinkFlag && ~linkFlags & permanent_GmLinkFlag ) {
                if (requestMedia_DocumentWidget_(d, run->linkId, iTrue)) {
                    return iTrue;
                }
            }
        }
    }
    return iFalse;
}

static void saveToDownloads_(const iString *url, const iString *mime, const iBlock *content) {
    const iString *savePath = downloadPathForUrl_App(url, mime);
    /* Write the file. */ {
        iFile *f = new_File(savePath);
        if (open_File(f, writeOnly_FileMode)) {
            write_File(f, content);
            close_File(f);
            const size_t size   = size_Block(content);
            const iBool  isMega = size >= 1000000;
#if defined (iPlatformAppleMobile)
            exportDownloadedFile_iOS(savePath);
#else
            makeMessage_Widget(uiHeading_ColorEscape "${heading.save}",
                               format_CStr("%s\n${dlg.save.size} %.3f %s", cstr_String(path_File(f)),
                                           isMega ? size / 1.0e6f : (size / 1.0e3f),
                                           isMega ? "${mb}" : "${kb}"));
#endif
        }
        else {
            makeMessage_Widget(uiTextCaution_ColorEscape "${heading.save.error}",
                               strerror(errno));
        }
        iRelease(f);
    }
}

static void addAllLinks_(void *context, const iGmRun *run) {
    iPtrArray *links = context;
    if (~run->flags & decoration_GmRunFlag && run->linkId) {
        pushBack_PtrArray(links, run);
    }
}

static size_t visibleLinkOrdinal_DocumentWidget_(const iDocumentWidget *d, iGmLinkId linkId) {
    size_t ord = 0;
    const iRangei visRange = visibleRange_DocumentWidget_(d);
    iConstForEach(PtrArray, i, &d->visibleLinks) {
        const iGmRun *run = i.ptr;
        if (top_Rect(run->visBounds) >= visRange.start + gap_UI * d->pageMargin * 4 / 5) {
            if (run->flags & decoration_GmRunFlag && run->linkId) {
                if (run->linkId == linkId) return ord;
                ord++;
            }
        }
    }
    return iInvalidPos;
}

/* Sorted by proximity to F and J. */
static const int homeRowKeys_[] = {
    'f', 'd', 's', 'a',
    'j', 'k', 'l',
    'r', 'e', 'w', 'q',
    'u', 'i', 'o', 'p',
    'v', 'c', 'x', 'z',
    'm', 'n',
    'g', 'h',
    'b',
    't', 'y',
};

static iBool updateDocumentWidthRetainingScrollPosition_DocumentWidget_(iDocumentWidget *d,
                                                                        iBool keepCenter) {
    const int newWidth = documentWidth_DocumentWidget_(d);
    if (newWidth == size_GmDocument(d->doc).x && !keepCenter /* not a font change */) {
        return iFalse;
    }
    /* Font changes (i.e., zooming) will keep the view centered, otherwise keep the top
       of the visible area fixed. */
    const iGmRun *run     = keepCenter ? middleRun_DocumentWidget_(d) : d->firstVisibleRun;
    const char *  runLoc  = (run ? run->text.start : NULL);
    int           voffset = 0;
    if (!keepCenter && run) {
        /* Keep the first visible run visible at the same position. */
        /* TODO: First *fully* visible run? */
        voffset = visibleRange_DocumentWidget_(d).start - top_Rect(run->visBounds);
    }
    setWidth_GmDocument(d->doc, newWidth);
    documentRunsInvalidated_DocumentWidget_(d);
    if (runLoc && !keepCenter) {
        run = findRunAtLoc_GmDocument(d->doc, runLoc);
        if (run) {
            scrollTo_DocumentWidget_(d,
                                     top_Rect(run->visBounds) +
                                         lineHeight_Text(paragraph_FontId) + voffset,
                                     iFalse);
        }
    }
    else if (runLoc && keepCenter) {
        run = findRunAtLoc_GmDocument(d->doc, runLoc);
        if (run) {
            scrollTo_DocumentWidget_(d, mid_Rect(run->bounds).y, iTrue);
        }
    }
    return iTrue;
}

static iBool handleCommand_DocumentWidget_(iDocumentWidget *d, const char *cmd) {
    iWidget *w = as_Widget(d);
    if (equal_Command(cmd, "window.resized") || equal_Command(cmd, "font.changed")) {
        /* Alt/Option key may be involved in window size changes. */
        setLinkNumberMode_DocumentWidget_(d, iFalse);
        d->phoneToolbar = findWidget_App("toolbar");
        const iBool keepCenter = equal_Command(cmd, "font.changed");
        updateDocumentWidthRetainingScrollPosition_DocumentWidget_(d, keepCenter);
        d->drawBufs->flags |= updateSideBuf_DrawBufsFlag;
        invalidate_DocumentWidget_(d);
        dealloc_VisBuf(d->visBuf);
        updateWindowTitle_DocumentWidget_(d);
        refresh_Widget(w);
    }
    else if (equal_Command(cmd, "window.focus.lost")) {
        if (d->flags & showLinkNumbers_DocumentWidgetFlag) {
            setLinkNumberMode_DocumentWidget_(d, iFalse);
            invalidateVisibleLinks_DocumentWidget_(d);
            refresh_Widget(w);
        }
        return iFalse;
    }
    else if (equal_Command(cmd, "window.mouse.exited")) {
        return iFalse;
    }
    else if (equal_Command(cmd, "theme.changed") && document_App() == d) {
        updateTheme_DocumentWidget_(d);
        updateVisible_DocumentWidget_(d);
        updateTrust_DocumentWidget_(d, NULL);
        d->drawBufs->flags |= updateSideBuf_DrawBufsFlag;
        invalidate_DocumentWidget_(d);
        refresh_Widget(w);
    }
    else if (equal_Command(cmd, "document.layout.changed") && document_App() == d) {
        updateSize_DocumentWidget(d);
    }
    else if (equal_Command(cmd, "tabs.changed")) {
        setLinkNumberMode_DocumentWidget_(d, iFalse);
        if (cmp_String(id_Widget(w), suffixPtr_Command(cmd, "id")) == 0) {
            /* Set palette for our document. */
            updateTheme_DocumentWidget_(d);
            updateTrust_DocumentWidget_(d, NULL);
            updateSize_DocumentWidget(d);
            updateFetchProgress_DocumentWidget_(d);
        }
        init_Anim(&d->sideOpacity, 0);
        init_Anim(&d->altTextOpacity, 0);
        updateSideOpacity_DocumentWidget_(d, iFalse);
        updateWindowTitle_DocumentWidget_(d);
        allocVisBuffer_DocumentWidget_(d);
        animateMedia_DocumentWidget_(d);
        return iFalse;
    }
    else if (equal_Command(cmd, "tab.created")) {
        /* Space for tab buttons has changed. */
        updateWindowTitle_DocumentWidget_(d);
        return iFalse;
    }
    else if (equal_Command(cmd, "document.info") && d == document_App()) {
        const char *unchecked       = red_ColorEscape "\u2610";
        const char *checked         = green_ColorEscape "\u2611";
        const iBool haveFingerprint = (d->certFlags & haveFingerprint_GmCertFlag) != 0;
        const iBool canTrust =
            (d->certFlags == (available_GmCertFlag | haveFingerprint_GmCertFlag |
                              timeVerified_GmCertFlag | domainVerified_GmCertFlag));
        const iRecentUrl *recent = findUrl_History(d->mod.history, d->mod.url);
        const iString *meta = &d->sourceMime;
        if (recent && recent->cachedResponse) {
            meta = &recent->cachedResponse->meta;
        }
        iString *msg = collectNew_String();
        if (isEmpty_String(&d->sourceHeader)) {
            appendFormat_String(msg,
                                "%s\n%s\n",
                                cstr_String(meta),
                                formatCStrs_Lang("num.bytes.n", size_Block(&d->sourceContent)));
        }
        else {
            appendFormat_String(msg, "%s\n", cstr_String(&d->sourceHeader));
            if (size_Block(&d->sourceContent)) {
                appendFormat_String(
                    msg, "%s\n", formatCStrs_Lang("num.bytes.n", size_Block(&d->sourceContent)));
            }
        }
        appendFormat_String(
            msg,
            "\n%s${pageinfo.cert.status}\n"
            "%s%s  %s\n"
            "%s%s  %s%s\n"
            "%s%s  %s (%04d-%02d-%02d %02d:%02d:%02d)\n"
            "%s%s  %s",
            uiHeading_ColorEscape,
            d->certFlags & authorityVerified_GmCertFlag ? checked
                                                        : uiTextAction_ColorEscape "\u2610",
            uiText_ColorEscape,
            d->certFlags & authorityVerified_GmCertFlag ? "${pageinfo.cert.ca.verified}"
                                                        : "${pageinfo.cert.ca.unverified}",
            d->certFlags & domainVerified_GmCertFlag ? checked : unchecked,
            uiText_ColorEscape,
            d->certFlags & domainVerified_GmCertFlag ? "${pageinfo.domain.match}"
                                                     : "${pageinfo.domain.mismatch}",
            ~d->certFlags & domainVerified_GmCertFlag
                ? format_CStr(" (%s)", cstr_String(d->certSubject))
                : "",
            d->certFlags & timeVerified_GmCertFlag ? checked : unchecked,
            uiText_ColorEscape,
            d->certFlags & timeVerified_GmCertFlag ? "${pageinfo.cert.notexpired}"
                                                   : "${pageinfo.cert.expired}",
            d->certExpiry.year,
            d->certExpiry.month,
            d->certExpiry.day,
            d->certExpiry.hour,
            d->certExpiry.minute,
            d->certExpiry.second,
            d->certFlags & trusted_GmCertFlag ? checked : unchecked,
            uiText_ColorEscape,
            d->certFlags & trusted_GmCertFlag ? "${pageinfo.cert.trusted}"
                                              : "${pageinfo.cert.untrusted}");
        setFocus_Widget(NULL);
        iArray *items = new_Array(sizeof(iMenuItem));
        if (canTrust) {
            pushBack_Array(
                items, &(iMenuItem){ uiTextCaution_ColorEscape "${dlg.cert.trust}", 0, 0, "server.trustcert" });
        }
        if (haveFingerprint) {
            pushBack_Array(items, &(iMenuItem){ "${dlg.cert.fingerprint}", 0, 0, "server.copycert" });
        }
        if (!isEmpty_Array(items)) {
            pushBack_Array(items, &(iMenuItem){ "---", 0, 0, 0 });
        }
        pushBack_Array(items, &(iMenuItem){ "${dismiss}", 0, 0, "message.ok" });
        iWidget *dlg = makeQuestion_Widget(uiHeading_ColorEscape "${heading.pageinfo}",
                                           cstr_String(msg),
                                           data_Array(items),
                                           size_Array(items));
        delete_Array(items);
        /* Enforce a minimum size. */
        iWidget *sizer = new_Widget();
        setFixedSize_Widget(sizer, init_I2(gap_UI * 65, 1));
        addChildFlags_Widget(dlg, iClob(sizer), frameless_WidgetFlag);
        setFlags_Widget(dlg, centerHorizontal_WidgetFlag, iFalse);
        if (deviceType_App() != phone_AppDeviceType) {
            setPos_Widget(dlg, bottomLeft_Rect(bounds_Widget(findWidget_App("navbar.lock"))));
        }
        arrange_Widget(dlg);
        addAction_Widget(dlg, SDLK_ESCAPE, 0, "message.ok");
        addAction_Widget(dlg, SDLK_SPACE, 0, "message.ok");
        return iTrue;
    }
    else if (equal_Command(cmd, "server.trustcert") && document_App() == d) {
        const iRangecc host = urlHost_String(d->mod.url);
        if (!isEmpty_Block(d->certFingerprint) && !isEmpty_Range(&host)) {
            setTrusted_GmCerts(certs_App(), host, d->certFingerprint, &d->certExpiry);
            d->certFlags |= trusted_GmCertFlag;
            postCommand_App("document.info");
            updateTrust_DocumentWidget_(d, NULL);
            redoLayout_GmDocument(d->doc);
            invalidate_DocumentWidget_(d);
            refresh_Widget(d);
        }
        return iTrue;
    }
    else if (equal_Command(cmd, "server.copycert") && document_App() == d) {
        SDL_SetClipboardText(cstrCollect_String(hexEncode_Block(d->certFingerprint)));
        return iTrue;
    }
    else if (equal_Command(cmd, "copy") && document_App() == d && !focus_Widget()) {
        iString *copied;
        if (d->selectMark.start) {
            iRangecc mark = d->selectMark;
            if (mark.start > mark.end) {
                iSwap(const char *, mark.start, mark.end);
            }
            copied = newRange_String(mark);
        }
        else {
            /* Full document. */
            copied = copy_String(source_GmDocument(d->doc));
        }
        SDL_SetClipboardText(cstr_String(copied));
        delete_String(copied);
        return iTrue;
    }
    else if (equal_Command(cmd, "document.copylink") && document_App() == d) {
        if (d->contextLink) {
            SDL_SetClipboardText(cstr_String(withSpacesEncoded_String(absoluteUrl_String(
                d->mod.url, linkUrl_GmDocument(d->doc, d->contextLink->linkId)))));
        }
        else {
            SDL_SetClipboardText(cstr_String(withSpacesEncoded_String(d->mod.url)));
        }
        return iTrue;
    }
    else if (equalWidget_Command(cmd, w, "document.downloadlink")) {
        if (d->contextLink) {
            const iGmLinkId linkId = d->contextLink->linkId;
            setDownloadUrl_Media(
                media_GmDocument(d->doc), linkId, linkUrl_GmDocument(d->doc, linkId));
            requestMedia_DocumentWidget_(d, linkId, iFalse /* no filters */);
            redoLayout_GmDocument(d->doc); /* inline downloader becomes visible */
            updateVisible_DocumentWidget_(d);
            invalidate_DocumentWidget_(d);
            refresh_Widget(w);
        }
        return iTrue;
    }
    else if (equal_Command(cmd, "document.input.submit") && document_Command(cmd) == d) {
        iString *value = suffix_Command(cmd, "value");
        set_String(value, collect_String(urlEncode_String(value)));
        iString *url = collect_String(copy_String(d->mod.url));
        const size_t qPos = indexOfCStr_String(url, "?");
        if (qPos != iInvalidPos) {
            remove_Block(&url->chars, qPos, iInvalidSize);
        }
        appendCStr_String(url, "?");
        append_String(url, value);
        postCommandf_App("open url:%s", cstr_String(url));
        delete_String(value);
        return iTrue;
    }
    else if (equal_Command(cmd, "valueinput.cancelled") &&
             equal_Rangecc(range_Command(cmd, "id"), "document.input.submit") && document_App() == d) {
        postCommand_App("navigate.back");
        return iTrue;
    }
    else if (equalWidget_Command(cmd, w, "document.request.updated") &&
             d->request && pointerLabel_Command(cmd, "request") == d->request) {
        set_Block(&d->sourceContent, &lockResponse_GmRequest(d->request)->body);
        unlockResponse_GmRequest(d->request);
        if (document_App() == d) {
            updateFetchProgress_DocumentWidget_(d);
        }
        checkResponse_DocumentWidget_(d);
        set_Atomic(&d->isRequestUpdated, iFalse); /* ready to be notified again */
        return iFalse;
    }
    else if (equalWidget_Command(cmd, w, "document.request.finished") &&
             pointerLabel_Command(cmd, "request") == d->request) {
        set_Block(&d->sourceContent, body_GmRequest(d->request));
        if (!isSuccess_GmStatusCode(status_GmRequest(d->request))) {
            format_String(&d->sourceHeader,
                          "%d %s",
                          status_GmRequest(d->request),
                          cstr_String(meta_GmRequest(d->request)));
        }
        else {
            clear_String(&d->sourceHeader);
        }
        updateFetchProgress_DocumentWidget_(d);
        checkResponse_DocumentWidget_(d);
        init_Anim(&d->scrollY, d->initNormScrollY * size_GmDocument(d->doc).y);
        d->state = ready_RequestState;
        /* The response may be cached. */ {
            if (!equal_Rangecc(urlScheme_String(d->mod.url), "about") &&
                startsWithCase_String(meta_GmRequest(d->request), "text/")) {
                setCachedResponse_History(d->mod.history, lockResponse_GmRequest(d->request));
                unlockResponse_GmRequest(d->request);
            }
        }
        iReleasePtr(&d->request);
        updateVisible_DocumentWidget_(d);
        d->drawBufs->flags |= updateSideBuf_DrawBufsFlag;
        postCommandf_App("document.changed doc:%p url:%s", d, cstr_String(d->mod.url));
        /* Check for a pending goto. */
        if (!isEmpty_String(&d->pendingGotoHeading)) {
            scrollToHeading_DocumentWidget_(d, cstr_String(&d->pendingGotoHeading));
            clear_String(&d->pendingGotoHeading);
        }
        cacheDocumentGlyphs_DocumentWidget_(d);
        return iFalse;
    }
    else if (equalWidget_Command(cmd, w, "document.translate")) {
        if (!d->translation) {
            d->translation = new_Translation(d);
        }
        return iTrue;
    }
    else if (startsWith_CStr(cmd, "translation.") && d->translation) {
        const iBool wasHandled = handleCommand_Translation(d->translation, cmd);
        if (isFinished_Translation(d->translation)) {
            delete_Translation(d->translation);
            d->translation = NULL;
        }
        return wasHandled;
    }
    else if (equal_Command(cmd, "media.updated") || equal_Command(cmd, "media.finished")) {
        return handleMediaCommand_DocumentWidget_(d, cmd);
    }
    else if (equal_Command(cmd, "media.player.started")) {
        /* When one media player starts, pause the others that may be playing. */
        const iPlayer *startedPlr = pointerLabel_Command(cmd, "player");
        const iMedia * media  = media_GmDocument(d->doc);
        const size_t   num    = numAudio_Media(media);
        for (size_t id = 1; id <= num; id++) {
            iPlayer *plr = audioPlayer_Media(media, id);
            if (plr != startedPlr) {
                setPaused_Player(plr, iTrue);
            }
        }
    }
    else if (equal_Command(cmd, "media.player.update")) {
        updateMedia_DocumentWidget_(d);
        return iFalse;
    }
    else if (equal_Command(cmd, "document.stop") && document_App() == d) {
        if (d->request) {
            postCommandf_App(
                "document.request.cancelled doc:%p url:%s", d, cstr_String(d->mod.url));
            iReleasePtr(&d->request);
            if (d->state != ready_RequestState) {
                d->state = ready_RequestState;
                postCommand_App("navigate.back");
            }
            updateFetchProgress_DocumentWidget_(d);
            return iTrue;
        }
    }
    else if (equalWidget_Command(cmd, w, "document.media.save")) {
        const iGmLinkId      linkId = argLabel_Command(cmd, "link");
        const iMediaRequest *media  = findMediaRequest_DocumentWidget_(d, linkId);
        if (media) {
            saveToDownloads_(url_GmRequest(media->req), meta_GmRequest(media->req),
                             body_GmRequest(media->req));
        }
    }
    else if (equal_Command(cmd, "document.save") && document_App() == d) {
        if (d->request) {
            makeMessage_Widget(uiTextCaution_ColorEscape "${heading.save.incomplete}",
                               "${dlg.save.incomplete}");
        }
        else if (!isEmpty_Block(&d->sourceContent)) {
            saveToDownloads_(d->mod.url, &d->sourceMime, &d->sourceContent);
        }
        return iTrue;
    }
    else if (equal_Command(cmd, "document.reload") && document_Command(cmd) == d) {
        d->initNormScrollY = normScrollPos_DocumentWidget_(d);
        fetch_DocumentWidget_(d);
        return iTrue;
    }
    else if (equal_Command(cmd, "document.linkkeys") && document_App() == d) {
        if (argLabel_Command(cmd, "release")) {
            setLinkNumberMode_DocumentWidget_(d, iFalse);
        }
        else if (argLabel_Command(cmd, "more")) {
            if (d->flags & showLinkNumbers_DocumentWidgetFlag &&
                d->ordinalMode == homeRow_DocumentLinkOrdinalMode) {
                const size_t numKeys = iElemCount(homeRowKeys_);
                const iGmRun *last = lastVisibleLink_DocumentWidget_(d);
                if (!last) {
                    d->ordinalBase = 0;
                }
                else {
                    d->ordinalBase += numKeys;
                    if (visibleLinkOrdinal_DocumentWidget_(d, last->linkId) < d->ordinalBase) {
                        d->ordinalBase = 0;
                    }
                }
            }
            else if (~d->flags & showLinkNumbers_DocumentWidgetFlag) {
                d->ordinalMode = homeRow_DocumentLinkOrdinalMode;
                d->ordinalBase = 0;
                setLinkNumberMode_DocumentWidget_(d, iTrue);
            }
        }
        else {
            d->ordinalMode = arg_Command(cmd);
            d->ordinalBase = 0;
            setLinkNumberMode_DocumentWidget_(d, iTrue);
            iChangeFlags(d->flags, setHoverViaKeys_DocumentWidgetFlag,
                         argLabel_Command(cmd, "hover") != 0);
            iChangeFlags(d->flags, newTabViaHomeKeys_DocumentWidgetFlag,
                         argLabel_Command(cmd, "newtab") != 0);
        }
        invalidateVisibleLinks_DocumentWidget_(d);
        refresh_Widget(d);
        return iTrue;
    }
    else if (equal_Command(cmd, "navigate.back") && document_App() == d) {
        if (d->request) {
            postCommandf_App(
                "document.request.cancelled doc:%p url:%s", d, cstr_String(d->mod.url));
            iReleasePtr(&d->request);
            updateFetchProgress_DocumentWidget_(d);
        }
        goBack_History(d->mod.history);
        return iTrue;
    }
    else if (equal_Command(cmd, "navigate.forward") && document_App() == d) {
        goForward_History(d->mod.history);
        return iTrue;
    }
    else if (equal_Command(cmd, "navigate.parent") && document_App() == d) {
        iUrl parts;
        init_Url(&parts, d->mod.url);
        /* Remove the last path segment. */
        if (size_Range(&parts.path) > 1) {
            if (parts.path.end[-1] == '/') {
                parts.path.end--;
            }
            while (parts.path.end > parts.path.start) {
                if (parts.path.end[-1] == '/') break;
                parts.path.end--;
            }
            postCommandf_App(
                "open url:%s",
                cstr_Rangecc((iRangecc){ constBegin_String(d->mod.url), parts.path.end }));
        }
        return iTrue;
    }
    else if (equal_Command(cmd, "navigate.root") && document_App() == d) {
        postCommandf_App("open url:%s/", cstr_Rangecc(urlRoot_String(d->mod.url)));
        return iTrue;
    }
    else if (equalWidget_Command(cmd, w, "scroll.moved")) {
        init_Anim(&d->scrollY, arg_Command(cmd));
        updateVisible_DocumentWidget_(d);
        return iTrue;
    }
    else if (equal_Command(cmd, "scroll.page") && document_App() == d) {
        const int dir = arg_Command(cmd);
        if (dir > 0 && !argLabel_Command(cmd, "repeat") &&
            prefs_App()->loadImageInsteadOfScrolling &&
            fetchNextUnfetchedImage_DocumentWidget_(d)) {
            return iTrue;
        }
        const float amount = argLabel_Command(cmd, "full") != 0 ? 1.0f : 0.5f;
        smoothScroll_DocumentWidget_(d,
                                     dir * amount * height_Rect(documentBounds_DocumentWidget_(d)),
                                     smoothDuration_DocumentWidget_);
        return iTrue;
    }
    else if (equal_Command(cmd, "scroll.top") && document_App() == d) {
        init_Anim(&d->scrollY, 0);
        invalidate_VisBuf(d->visBuf);
        scroll_DocumentWidget_(d, 0);
        updateVisible_DocumentWidget_(d);
        refresh_Widget(w);
        return iTrue;
    }
    else if (equal_Command(cmd, "scroll.bottom") && document_App() == d) {
        init_Anim(&d->scrollY, scrollMax_DocumentWidget_(d));
        invalidate_VisBuf(d->visBuf);
        scroll_DocumentWidget_(d, 0);
        updateVisible_DocumentWidget_(d);
        refresh_Widget(w);
        return iTrue;
    }
    else if (equal_Command(cmd, "scroll.step") && document_App() == d) {
        const int dir = arg_Command(cmd);
        if (dir > 0 && !argLabel_Command(cmd, "repeat") &&
            prefs_App()->loadImageInsteadOfScrolling &&
            fetchNextUnfetchedImage_DocumentWidget_(d)) {
            return iTrue;
        }
        smoothScroll_DocumentWidget_(d,
                                     3 * lineHeight_Text(paragraph_FontId) * dir,
                                     smoothDuration_DocumentWidget_);
        return iTrue;
    }
    else if (equal_Command(cmd, "document.goto") && document_App() == d) {
        const char *heading = suffixPtr_Command(cmd, "heading");
        if (heading) {
            if (isRequestOngoing_DocumentWidget(d)) {
                /* Scroll position set when request finishes. */
                setCStr_String(&d->pendingGotoHeading, heading);
                return iTrue;
            }
            scrollToHeading_DocumentWidget_(d, heading);
            return iTrue;
        }
        const char *loc = pointerLabel_Command(cmd, "loc");
        const iGmRun *run = findRunAtLoc_GmDocument(d->doc, loc);
        if (run) {
            scrollTo_DocumentWidget_(d, run->visBounds.pos.y, iFalse);
        }
        return iTrue;
    }
    else if ((equal_Command(cmd, "find.next") || equal_Command(cmd, "find.prev")) &&
             document_App() == d) {
        const int dir = equal_Command(cmd, "find.next") ? +1 : -1;
        iRangecc (*finder)(const iGmDocument *, const iString *, const char *) =
            dir > 0 ? findText_GmDocument : findTextBefore_GmDocument;
        iInputWidget *find = findWidget_App("find.input");
        if (isEmpty_String(text_InputWidget(find))) {
            d->foundMark = iNullRange;
        }
        else {
            const iBool wrap = d->foundMark.start != NULL;
            d->foundMark     = finder(d->doc, text_InputWidget(find), dir > 0 ? d->foundMark.end
                                                                          : d->foundMark.start);
            if (!d->foundMark.start && wrap) {
                /* Wrap around. */
                d->foundMark = finder(d->doc, text_InputWidget(find), NULL);
            }
            if (d->foundMark.start) {
                const iGmRun *found;
                if ((found = findRunAtLoc_GmDocument(d->doc, d->foundMark.start)) != NULL) {
                    scrollTo_DocumentWidget_(d, mid_Rect(found->bounds).y, iTrue);
                }
            }
        }
        invalidateWideRunsWithNonzeroOffset_DocumentWidget_(d); /* markers don't support offsets */
        resetWideRuns_DocumentWidget_(d);
        refresh_Widget(w);
        return iTrue;
    }
    else if (equal_Command(cmd, "find.clearmark")) {
        if (d->foundMark.start) {
            d->foundMark = iNullRange;
            refresh_Widget(w);
        }
        return iTrue;
    }
    else if (equal_Command(cmd, "bookmark.links") && document_App() == d) {
        iPtrArray *links = collectNew_PtrArray();
        render_GmDocument(d->doc, (iRangei){ 0, size_GmDocument(d->doc).y }, addAllLinks_, links);
        /* Find links that aren't already bookmarked. */
        iForEach(PtrArray, i, links) {
            const iGmRun *run = i.ptr;
            uint32_t      bmid;
            if ((bmid = findUrl_Bookmarks(bookmarks_App(),
                                          linkUrl_GmDocument(d->doc, run->linkId))) != 0) {
                const iBookmark *bm = get_Bookmarks(bookmarks_App(), bmid);
                /* We can import local copies of remote bookmarks. */
                if (!hasTag_Bookmark(bm, "remote")) {
                    remove_PtrArrayIterator(&i);
                }
            }
        }
        if (!isEmpty_PtrArray(links)) {
            if (argLabel_Command(cmd, "confirm")) {
                const size_t count = size_PtrArray(links);
                makeQuestion_Widget(
                    uiHeading_ColorEscape "${heading.import.bookmarks}",
                    formatCStrs_Lang("dlg.import.found.n", count),
                    (iMenuItem[]){ { "${cancel}", 0, 0, NULL },
                                   { format_CStr(cstrCount_Lang("dlg.import.add.n", count),
                                                 uiTextAction_ColorEscape,
                                                 count),
                                     0,
                                     0,
                                     "bookmark.links" } },
                    2);
            }
            else {
                iConstForEach(PtrArray, j, links) {
                    const iGmRun *run = j.ptr;
                    add_Bookmarks(bookmarks_App(),
                                  linkUrl_GmDocument(d->doc, run->linkId),
                                  collect_String(newRange_String(run->text)),
                                  NULL,
                                  0x1f588 /* pin */);
                }
                postCommand_App("bookmarks.changed");
            }
        }
        else {
            makeMessage_Widget(uiHeading_ColorEscape "${heading.import.bookmarks}",
                               "${dlg.import.notnew}");
        }
        return iTrue;
    }
    else if (equalWidget_Command(cmd, w, "menu.closed")) {
        updateHover_DocumentWidget_(d, mouseCoord_Window(get_Window()));
    }
    else if (equal_Command(cmd, "document.autoreload")) {
        if (d->mod.reloadInterval) {
            if (!isValid_Time(&d->sourceTime) || elapsedSeconds_Time(&d->sourceTime) >=
                    seconds_ReloadInterval_(d->mod.reloadInterval)) {
                postCommand_Widget(w, "document.reload");
            }
        }
    }
    else if (equal_Command(cmd, "document.autoreload.menu") && document_App() == d) {
        iWidget *dlg = makeQuestion_Widget(uiTextAction_ColorEscape "${heading.autoreload}",
                                           "${dlg.autoreload}",
                                           (iMenuItem[]){ { "${cancel}", 0, 0, NULL } },
                                           1);
        for (int i = 0; i < max_ReloadInterval; ++i) {
            insertChildAfterFlags_Widget(
                dlg,
                iClob(new_LabelWidget(label_ReloadInterval_(i),
                                      format_CStr("document.autoreload.set arg:%d", i))),
                i + 1,
                resizeToParentWidth_WidgetFlag |
                    ((int) d->mod.reloadInterval == i ? selected_WidgetFlag : 0));
        }
        arrange_Widget(dlg);
        return iTrue;
    }
    else if (equal_Command(cmd, "document.autoreload.set") && document_App() == d) {
        d->mod.reloadInterval = arg_Command(cmd);
    }
    return iFalse;
}

static iRect runRect_DocumentWidget_(const iDocumentWidget *d, const iGmRun *run) {
    const iRect docBounds = documentBounds_DocumentWidget_(d);
    return moved_Rect(run->bounds, addY_I2(topLeft_Rect(docBounds), -value_Anim(&d->scrollY)));
}

static void setGrabbedPlayer_DocumentWidget_(iDocumentWidget *d, const iGmRun *run) {
    if (run && run->mediaType == audio_GmRunMediaType) {
        iPlayer *plr = audioPlayer_Media(media_GmDocument(d->doc), run->mediaId);
        setFlags_Player(plr, volumeGrabbed_PlayerFlag, iTrue);
        d->grabbedStartVolume = volume_Player(plr);
        d->grabbedPlayer      = run;
        refresh_Widget(d);
    }
    else if (d->grabbedPlayer) {
        setFlags_Player(
            audioPlayer_Media(media_GmDocument(d->doc), d->grabbedPlayer->mediaId),
            volumeGrabbed_PlayerFlag,
            iFalse);
        d->grabbedPlayer = NULL;
        refresh_Widget(d);
    }
    else {
        iAssert(iFalse);
    }
}

static iBool processMediaEvents_DocumentWidget_(iDocumentWidget *d, const SDL_Event *ev) {
    if (ev->type != SDL_MOUSEBUTTONDOWN && ev->type != SDL_MOUSEBUTTONUP &&
        ev->type != SDL_MOUSEMOTION) {
        return iFalse;
    }
    if (ev->type == SDL_MOUSEBUTTONDOWN || ev->type == SDL_MOUSEBUTTONUP) {
        if (ev->button.button != SDL_BUTTON_LEFT) {
            return iFalse;
        }
    }
    if (d->grabbedPlayer) {
        /* Updated in the drag. */
        return iFalse;
    }
    const iInt2 mouse = init_I2(ev->button.x, ev->button.y);
    iConstForEach(PtrArray, i, &d->visibleMedia) {
        const iGmRun *run  = i.ptr;
        if (run->mediaType != audio_GmRunMediaType) {
            continue;
        }
        const iRect rect = runRect_DocumentWidget_(d, run);
        iPlayer *   plr  = audioPlayer_Media(media_GmDocument(d->doc), run->mediaId);
        if (contains_Rect(rect, mouse)) {
            iPlayerUI ui;
            init_PlayerUI(&ui, plr, rect);
            if (ev->type == SDL_MOUSEBUTTONDOWN && flags_Player(plr) & adjustingVolume_PlayerFlag &&
                contains_Rect(adjusted_Rect(ui.volumeAdjustRect,
                                            zero_I2(),
                                            init_I2(-height_Rect(ui.volumeAdjustRect), 0)),
                              mouse)) {
                setGrabbedPlayer_DocumentWidget_(d, run);
                processEvent_Click(&d->click, ev);
                /* The rest is done in the DocumentWidget click responder. */
                refresh_Widget(d);
                return iTrue;
            }
            else if (ev->type == SDL_MOUSEBUTTONDOWN || ev->type == SDL_MOUSEMOTION) {
                refresh_Widget(d);
                return iTrue;
            }
            if (contains_Rect(ui.playPauseRect, mouse)) {
                setPaused_Player(plr, !isPaused_Player(plr));
                animateMedia_DocumentWidget_(d);
                return iTrue;
            }
            else if (contains_Rect(ui.rewindRect, mouse)) {
                if (isStarted_Player(plr) && time_Player(plr) > 0.5f) {
                    stop_Player(plr);
                    start_Player(plr);
                    setPaused_Player(plr, iTrue);
                }
                refresh_Widget(d);
                return iTrue;
            }
            else if (contains_Rect(ui.volumeRect, mouse)) {
                setFlags_Player(plr,
                                adjustingVolume_PlayerFlag,
                                !(flags_Player(plr) & adjustingVolume_PlayerFlag));
                animateMedia_DocumentWidget_(d);
                refresh_Widget(d);
                return iTrue;
            }
            else if (contains_Rect(ui.menuRect, mouse)) {
                /* TODO: Add menu items for:
                   - output device
                   - Save to Downloads
                */
                if (d->playerMenu) {
                    destroy_Widget(d->playerMenu);
                    d->playerMenu = NULL;
                    return iTrue;
                }
                d->playerMenu = makeMenu_Widget(
                    as_Widget(d),
                    (iMenuItem[]){
                        { cstrCollect_String(metadataLabel_Player(plr)), 0, 0, NULL },
                    },
                    1);
                openMenu_Widget(d->playerMenu,
                                localCoord_Widget(constAs_Widget(d), bottomLeft_Rect(ui.menuRect)));
                return iTrue;
            }
        }
    }
    return iFalse;
}

static size_t linkOrdinalFromKey_DocumentWidget_(const iDocumentWidget *d, int key) {
    size_t ord = iInvalidPos;
    if (d->ordinalMode == numbersAndAlphabet_DocumentLinkOrdinalMode) {
        if (key >= '1' && key <= '9') {
            return key - '1';
        }
        if (key < 'a' || key > 'z') {
            return iInvalidPos;
        }
        ord = key - 'a' + 9;
#if defined (iPlatformApple)
        /* Skip keys that would conflict with default system shortcuts: hide, minimize, quit, close. */
        if (key == 'h' || key == 'm' || key == 'q' || key == 'w') {
            return iInvalidPos;
        }
        if (key > 'h') ord--;
        if (key > 'm') ord--;
        if (key > 'q') ord--;
        if (key > 'w') ord--;
#endif
    }
    else {
        iForIndices(i, homeRowKeys_) {
            if (homeRowKeys_[i] == key) {
                return i;
            }
        }
    }
    return ord;
}

static iChar linkOrdinalChar_DocumentWidget_(const iDocumentWidget *d, size_t ord) {
    if (d->ordinalMode == numbersAndAlphabet_DocumentLinkOrdinalMode) {
        if (ord < 9) {
            return 0x278a + ord;
        }
#if defined (iPlatformApple)
        if (ord < 9 + 22) {
            int key = 'a' + ord - 9;
            if (key >= 'h') key++;
            if (key >= 'm') key++;
            if (key >= 'q') key++;
            if (key >= 'w') key++;
            return 0x24b6 + key - 'a';
        }
#else
        if (ord < 9 + 26) {
            return 0x24b6 + ord - 9;
        }
#endif
    }
    else {
        if (ord < iElemCount(homeRowKeys_)) {
            return 0x24b6 + homeRowKeys_[ord] - 'a';
        }
    }
    return 0;
}

static void beginMarkingSelection_DocumentWidget_(iDocumentWidget *d, iInt2 pos) {
    setFocus_Widget(NULL); /* TODO: Focus this document? */
    invalidateWideRunsWithNonzeroOffset_DocumentWidget_(d);
    resetWideRuns_DocumentWidget_(d); /* Selections don't support horizontal scrolling. */
    iChangeFlags(d->flags, selecting_DocumentWidgetFlag, iTrue);
    d->selectMark = sourceLoc_DocumentWidget_(d, pos);
    refresh_Widget(as_Widget(d));
}

static iBool processEvent_DocumentWidget_(iDocumentWidget *d, const SDL_Event *ev) {
    iWidget *w = as_Widget(d);
    if (isMetricsChange_UserEvent(ev)) {
        updateSize_DocumentWidget(d);
    }
    else if (ev->type == SDL_USEREVENT && ev->user.code == command_UserEventCode) {
        if (!handleCommand_DocumentWidget_(d, command_UserEvent(ev))) {
            /* Base class commands. */
            return processEvent_Widget(w, ev);
        }
        return iTrue;
    }
    if (ev->type == SDL_KEYDOWN) {
        const int key = ev->key.keysym.sym;
        if ((d->flags & showLinkNumbers_DocumentWidgetFlag) &&
            ((key >= '1' && key <= '9') || (key >= 'a' && key <= 'z'))) {
            const size_t ord = linkOrdinalFromKey_DocumentWidget_(d, key) + d->ordinalBase;
            iConstForEach(PtrArray, i, &d->visibleLinks) {
                if (ord == iInvalidPos) break;
                const iGmRun *run = i.ptr;
                if (run->flags & decoration_GmRunFlag &&
                    visibleLinkOrdinal_DocumentWidget_(d, run->linkId) == ord) {
                    if (d->flags & setHoverViaKeys_DocumentWidgetFlag) {
                        d->hoverLink = run;
                    }
                    else {
                        postCommandf_App("open newtab:%d url:%s",
                                         d->ordinalMode ==
                                                 numbersAndAlphabet_DocumentLinkOrdinalMode
                                             ? openTabMode_Sym(modState_Keys())
                                             : (d->flags & newTabViaHomeKeys_DocumentWidgetFlag ? 1 : 0),
                                         cstr_String(absoluteUrl_String(
                                             d->mod.url, linkUrl_GmDocument(d->doc, run->linkId))));
                    }
                    setLinkNumberMode_DocumentWidget_(d, iFalse);
                    invalidateVisibleLinks_DocumentWidget_(d);
                    refresh_Widget(d);
                    return iTrue;
                }
            }
        }
        switch (key) {
            case SDLK_ESCAPE:
                if (d->flags & showLinkNumbers_DocumentWidgetFlag && document_App() == d) {
                    setLinkNumberMode_DocumentWidget_(d, iFalse);
                    invalidateVisibleLinks_DocumentWidget_(d);
                    refresh_Widget(d);
                    return iTrue;
                }
                break;
#if 1
            case SDLK_KP_1:
            case '`': {
                iBlock *seed = new_Block(64);
                for (size_t i = 0; i < 64; ++i) {
                    setByte_Block(seed, i, iRandom(0, 256));
                }
                setThemeSeed_GmDocument(d->doc, seed);
                delete_Block(seed);
                invalidate_DocumentWidget_(d);
                refresh_Widget(w);
                break;
            }
#endif
#if 0
            case '0': {
                extern int enableHalfPixelGlyphs_Text;
                enableHalfPixelGlyphs_Text = !enableHalfPixelGlyphs_Text;
                refresh_Widget(w);
                printf("halfpixel: %d\n", enableHalfPixelGlyphs_Text);
                fflush(stdout);
                break;
            }
#endif
#if 0
            case '0': {
                extern int enableKerning_Text;
                enableKerning_Text = !enableKerning_Text;
                invalidate_DocumentWidget_(d);
                refresh_Widget(w);
                printf("kerning: %d\n", enableKerning_Text);
                fflush(stdout);
                break;
            }
#endif
        }
    }
    else if (ev->type == SDL_MOUSEWHEEL && isHover_Widget(w)) {
        const iInt2 mouseCoord = mouseCoord_Window(get_Window());
        if (isPerPixel_MouseWheelEvent(&ev->wheel)) {
            stop_Anim(&d->scrollY);
            iInt2 wheel = init_I2(ev->wheel.x, ev->wheel.y);
            scroll_DocumentWidget_(d, -wheel.y);
            scrollWideBlock_DocumentWidget_(d, mouseCoord, -wheel.x, 0);
        }
        else {
            /* Traditional mouse wheel. */
            const int amount = ev->wheel.y;
            if (keyMods_Sym(modState_Keys()) == KMOD_PRIMARY) {
                postCommandf_App("zoom.delta arg:%d", amount > 0 ? 10 : -10);
                return iTrue;
            }
            smoothScroll_DocumentWidget_(
                d,
                -3 * amount * lineHeight_Text(paragraph_FontId),
                smoothDuration_DocumentWidget_ *
                    /* accelerated speed for repeated wheelings */
                    (!isFinished_Anim(&d->scrollY) && pos_Anim(&d->scrollY) < 0.25f ? 0.5f : 1.0f));
            scrollWideBlock_DocumentWidget_(
                d, mouseCoord, -3 * ev->wheel.x * lineHeight_Text(paragraph_FontId), 167);
        }
        iChangeFlags(d->flags, noHoverWhileScrolling_DocumentWidgetFlag, iTrue);
        return iTrue;
    }
    else if (ev->type == SDL_MOUSEMOTION) {
        iChangeFlags(d->flags, noHoverWhileScrolling_DocumentWidgetFlag, iFalse);
        const iInt2 mpos = init_I2(ev->motion.x, ev->motion.y);
        if (isVisible_Widget(d->menu)) {
            setCursor_Window(get_Window(), SDL_SYSTEM_CURSOR_ARROW);
        }
        else if (contains_Rect(siteBannerRect_DocumentWidget_(d), mpos)) {
            setCursor_Window(get_Window(), SDL_SYSTEM_CURSOR_HAND);
        }
        else {
            if (value_Anim(&d->altTextOpacity) < 0.833f) {
                setValue_Anim(&d->altTextOpacity, 0, 0); /* keep it hidden while moving */
            }
            updateHover_DocumentWidget_(d, mpos);
        }
    }
    if (ev->type == SDL_MOUSEBUTTONDOWN) {
        if (ev->button.button == SDL_BUTTON_X1) {
            postCommand_App("navigate.back");
            return iTrue;
        }
        if (ev->button.button == SDL_BUTTON_X2) {
            postCommand_App("navigate.forward");
            return iTrue;
        }
        if (ev->button.button == SDL_BUTTON_MIDDLE && d->hoverLink) {
            postCommandf_App("open newtab:%d url:%s",
                             modState_Keys() & KMOD_SHIFT ? 1 : 2,
                             cstr_String(linkUrl_GmDocument(d->doc, d->hoverLink->linkId)));
            return iTrue;
        }
        if (ev->button.button == SDL_BUTTON_RIGHT &&
            contains_Widget(w, init_I2(ev->button.x, ev->button.y))) {
            if (!d->menu || !isVisible_Widget(d->menu)) {
                d->contextLink = d->hoverLink;
                if (d->menu) {
                    destroy_Widget(d->menu);
                }
                setFocus_Widget(NULL);
                iArray items;
                init_Array(&items, sizeof(iMenuItem));
                if (d->contextLink) {
                    const iString *linkUrl  = linkUrl_GmDocument(d->doc, d->contextLink->linkId);
//                    const int      linkFlags = linkFlags_GmDocument(d->doc, d->contextLink->linkId);
                    const iRangecc scheme   = urlScheme_String(linkUrl);
                    const iBool    isGemini = equalCase_Rangecc(scheme, "gemini");
                    iBool          isNative = iFalse;
                    if (willUseProxy_App(scheme) || isGemini ||
                        equalCase_Rangecc(scheme, "finger") ||
                        equalCase_Rangecc(scheme, "gopher")) {
                        isNative = iTrue;
                        /* Regular links that we can open. */
                        pushBackN_Array(
                            &items,
                            (iMenuItem[]){
                                { openTab_Icon " ${link.newtab}",
                                  0,
                                  0,
                                  format_CStr("!open newtab:1 url:%s", cstr_String(linkUrl)) },
                                { openTabBg_Icon " ${link.newtab.background}",
                                  0,
                                  0,
                                  format_CStr("!open newtab:2 url:%s", cstr_String(linkUrl)) } },
                            2);
                    }
                    else if (!willUseProxy_App(scheme)) {
                        pushBack_Array(
                            &items,
                            &(iMenuItem){ openExt_Icon " ${link.browser}",
                                          0,
                                          0,
                                          format_CStr("!open default:1 url:%s", cstr_String(linkUrl)) });
                    }
                    if (willUseProxy_App(scheme)) {
                        pushBackN_Array(
                            &items,
                            (iMenuItem[]){
                                { "---", 0, 0, NULL },
                                { isGemini ? "${link.noproxy}" : openExt_Icon " ${link.browser}",
                                  0,
                                  0,
                                  format_CStr("!open noproxy:1 url:%s", cstr_String(linkUrl)) } },
                            2);
                    }
                    iString *linkLabel = collectNewRange_String(
                        linkLabel_GmDocument(d->doc, d->contextLink->linkId));
                    urlEncodeSpaces_String(linkLabel);
                    pushBackN_Array(&items,
                                    (iMenuItem[]){ { "---", 0, 0, NULL },
                                                   { "${link.copy}", 0, 0, "document.copylink" },
                                                   { pin_Icon " ${link.bookmark}",
                                                     0,
                                                     0,
                                                     format_CStr("!bookmark.add title:%s url:%s",
                                                                 cstr_String(linkLabel),
                                                                 cstr_String(linkUrl)) },
                                                   },
                                    3);
                    if (isNative && d->contextLink->mediaType != download_GmRunMediaType) {
                        pushBackN_Array(&items, (iMenuItem[]){
                            { "---", 0, 0, NULL },
                            { download_Icon " ${link.download}", 0, 0, "document.downloadlink" },
                        }, 2);
                    }
                    iMediaRequest *mediaReq;
                    if ((mediaReq = findMediaRequest_DocumentWidget_(d, d->contextLink->linkId)) != NULL &&
                        d->contextLink->mediaType != download_GmRunMediaType) {
                        if (isFinished_GmRequest(mediaReq->req)) {
                            pushBack_Array(&items,
                                           &(iMenuItem){ download_Icon " " saveToDownloads_Label,
                                                         0,
                                                         0,
                                                         format_CStr("document.media.save link:%u",
                                                                     d->contextLink->linkId) });
                        }
                    }
                }
                else {
                    if (!isEmpty_Range(&d->selectMark)) {
                        pushBackN_Array(
                            &items,
                            (iMenuItem[]){ { "${menu.copy}", 0, 0, "copy" }, { "---", 0, 0, NULL } },
                            2);
                    }
                    if (deviceType_App() == desktop_AppDeviceType) {
                        pushBackN_Array(
                            &items,
                            (iMenuItem[]){
                                { "${menu.back}", navigateBack_KeyShortcut, "navigate.back" },
                                { "${menu.forward}", navigateForward_KeyShortcut, "navigate.forward" } },
                            2);
                    }
                    pushBackN_Array(
                        &items,
                        (iMenuItem[]){
                            { upArrow_Icon " ${menu.parent}", navigateParent_KeyShortcut, "navigate.parent" },
                            { upArrowBar_Icon " ${menu.root}", navigateRoot_KeyShortcut, "navigate.root" },
                            { "---", 0, 0, NULL },
                            { reload_Icon " ${menu.reload}", reload_KeyShortcut, "navigate.reload" },
                            { timer_Icon " ${menu.autoreload}", 0, 0, "document.autoreload.menu" },
                            { "---", 0, 0, NULL },
                            { pin_Icon " ${menu.page.bookmark}", SDLK_d, KMOD_PRIMARY, "bookmark.add" },
                            { star_Icon " ${menu.page.subscribe}", subscribeToPage_KeyModifier, "feeds.subscribe" },
                            { "---", 0, 0, NULL },
                            { book_Icon " ${menu.page.import}", 0, 0, "bookmark.links confirm:1" },
                            { globe_Icon " ${menu.page.translate}", 0, 0, "document.translate" },
                            { "---", 0, 0, NULL },
                            { "${menu.page.copyurl}", 0, 0, "document.copylink" } },
                        12);
                    if (isEmpty_Range(&d->selectMark)) {
                        pushBackN_Array(
                            &items,
                            (iMenuItem[]){
                                { "${menu.page.copysource}", 'c', KMOD_PRIMARY, "copy" },
                                { download_Icon " " saveToDownloads_Label, SDLK_s, KMOD_PRIMARY, "document.save" } },
                            2);
                    }
                }
                d->menu = makeMenu_Widget(w, data_Array(&items), size_Array(&items));
                deinit_Array(&items);
            }
            processContextMenuEvent_Widget(d->menu, ev, {});
        }
    }
    if (processMediaEvents_DocumentWidget_(d, ev)) {
        return iTrue;
    }
    /* The left mouse button. */
    switch (processEvent_Click(&d->click, ev)) {
        case started_ClickResult:
            if (d->grabbedPlayer) {
                return iTrue;
            }
            iChangeFlags(d->flags, selecting_DocumentWidgetFlag, iFalse);
            iChangeFlags(d->flags, selectWords_DocumentWidgetFlag, d->click.count == 2);
            iChangeFlags(d->flags, selectLines_DocumentWidgetFlag, d->click.count >= 3);
            /* Double/triple clicks marks the selection immediately. */
            if (d->click.count >= 2) {
                beginMarkingSelection_DocumentWidget_(d, d->click.startPos);
                extendRange_Rangecc(
                    &d->selectMark,
                    range_String(source_GmDocument(d->doc)),
                    bothStartAndEnd_RangeExtension |
                        (d->click.count == 2 ? word_RangeExtension : line_RangeExtension));
                d->initialSelectMark = d->selectMark;
                refresh_Widget(w);
            }
            else {
                d->initialSelectMark = iNullRange;
            }
            return iTrue;
        case drag_ClickResult: {
            if (d->grabbedPlayer) {
                iPlayer *plr =
                    audioPlayer_Media(media_GmDocument(d->doc), d->grabbedPlayer->mediaId);
                iPlayerUI ui;
                init_PlayerUI(&ui, plr, runRect_DocumentWidget_(d, d->grabbedPlayer));
                float off = (float) delta_Click(&d->click).x / (float) width_Rect(ui.volumeSlider);
                setVolume_Player(plr, d->grabbedStartVolume + off);
                refresh_Widget(w);
                return iTrue;
            }
            /* Begin selecting a range of text. */
            if (~d->flags & selecting_DocumentWidgetFlag && d->hoverPre &&
                preIsFolded_GmDocument(d->doc, d->hoverPre->preId)) {
                return iTrue;
            }
            if (~d->flags & selecting_DocumentWidgetFlag) {
                beginMarkingSelection_DocumentWidget_(d, d->click.startPos);
            }
            iRangecc loc = sourceLoc_DocumentWidget_(d, pos_Click(&d->click));
            if (!d->selectMark.start) {
                d->selectMark = loc;
            }
            else if (loc.end) {
                d->selectMark.end = (d->selectMark.end > d->selectMark.start ? loc.end : loc.start);
            }
            iAssert((!d->selectMark.start && !d->selectMark.end) ||
                    ( d->selectMark.start &&  d->selectMark.end));
            /* Extend the selection when double/triple clicking. */
            if (d->flags & (selectWords_DocumentWidgetFlag | selectLines_DocumentWidgetFlag)) {
                extendRange_Rangecc(
                    &d->selectMark,
                    range_String(source_GmDocument(d->doc)),
                    d->click.count == 2 ? word_RangeExtension : line_RangeExtension);
                if (!isEmpty_Range(&d->initialSelectMark)) {
                    if (d->selectMark.end > d->selectMark.start) {
                        d->selectMark.start = d->initialSelectMark.start;
                    }
                    else if (d->selectMark.end < d->selectMark.start) {
                        d->selectMark.start = d->initialSelectMark.end;
                    }
                }
            }
//            printf("mark %zu ... %zu\n", d->selectMark.start - cstr_String(source_GmDocument(d->doc)),
//                   d->selectMark.end - cstr_String(source_GmDocument(d->doc)));
//            fflush(stdout);
            refresh_Widget(w);
            return iTrue;
        }
        case finished_ClickResult:
            if (d->grabbedPlayer) {
                setGrabbedPlayer_DocumentWidget_(d, NULL);
                return iTrue;
            }
            if (isVisible_Widget(d->menu)) {
                closeMenu_Widget(d->menu);
            }
            if (!isMoved_Click(&d->click)) {
                setFocus_Widget(NULL);
                if (d->hoverPre) {
                    togglePreFold_DocumentWidget_(d, d->hoverPre->preId);
                    return iTrue;
                }
                if (d->hoverLink) {
                    const iGmLinkId linkId = d->hoverLink->linkId;
                    const int linkFlags = linkFlags_GmDocument(d->doc, linkId);
                    iAssert(linkId);
                    /* Media links are opened inline by default. */
                    if (isMediaLink_GmDocument(d->doc, linkId)) {
                        if (linkFlags & content_GmLinkFlag && linkFlags & permanent_GmLinkFlag) {
                            /* We have the content and it cannot be dismissed, so nothing
                               further to do. */
                            return iTrue;
                        }
                        if (!requestMedia_DocumentWidget_(d, linkId, iTrue)) {
                            if (linkFlags & content_GmLinkFlag) {
                                /* Dismiss shown content on click. */
                                setData_Media(media_GmDocument(d->doc),
                                              linkId,
                                              NULL,
                                              NULL,
                                              allowHide_MediaFlag);
                                /* Cancel a partially received request. */ {
                                    iMediaRequest *req = findMediaRequest_DocumentWidget_(d, linkId);
                                    if (!isFinished_GmRequest(req->req)) {
                                        cancel_GmRequest(req->req);
                                        removeMediaRequest_DocumentWidget_(d, linkId);
                                        /* Note: Some of the audio IDs have changed now, layout must
                                           be redone. */
                                    }
                                }
                                redoLayout_GmDocument(d->doc);
                                d->hoverLink = NULL;
                                scroll_DocumentWidget_(d, 0);
                                updateVisible_DocumentWidget_(d);
                                invalidate_DocumentWidget_(d);
                                refresh_Widget(w);
                                return iTrue;
                            }
                            else {
                                /* Show the existing content again if we have it. */
                                iMediaRequest *req = findMediaRequest_DocumentWidget_(d, linkId);
                                if (req) {
                                    setData_Media(media_GmDocument(d->doc),
                                                  linkId,
                                                  meta_GmRequest(req->req),
                                                  body_GmRequest(req->req),
                                                  allowHide_MediaFlag);
                                    redoLayout_GmDocument(d->doc);
                                    updateVisible_DocumentWidget_(d);
                                    invalidate_DocumentWidget_(d);
                                    refresh_Widget(w);
                                    return iTrue;
                                }
                            }
                        }
                        refresh_Widget(w);
                    }
                    else if (linkFlags & supportedProtocol_GmLinkFlag) {
                        postCommandf_App("open newtab:%d url:%s",
                                         openTabMode_Sym(modState_Keys()),
                                         cstr_String(absoluteUrl_String(
                                             d->mod.url, linkUrl_GmDocument(d->doc, linkId))));
                    }
                    else {
                        const iString *url = absoluteUrl_String(
                            d->mod.url, linkUrl_GmDocument(d->doc, linkId));
                        makeQuestion_Widget(
                            uiTextCaution_ColorEscape "${heading.openlink}",
                            format_CStr(
                                cstr_Lang("dlg.openlink.confirm"),
                                uiTextAction_ColorEscape,
                                cstr_String(url)),
                            (iMenuItem[]){
                                { "${cancel}", 0, 0, NULL },
                                { uiTextCaution_ColorEscape "${dlg.openlink}",
                                  0, 0, format_CStr("!open default:1 url:%s", cstr_String(url)) } },
                            2);
                    }
                }
                if (d->selectMark.start && !(d->flags & (selectLines_DocumentWidgetFlag |
                                                         selectWords_DocumentWidgetFlag))) {
                    d->selectMark = iNullRange;
                    refresh_Widget(w);
                }
                /* Clicking on the top/side banner navigates to site root. */
                const iRect banRect = siteBannerRect_DocumentWidget_(d);
                if (contains_Rect(banRect, pos_Click(&d->click))) {
                    /* Clicking on a warning? */
                    if (bannerType_DocumentWidget_(d) == certificateWarning_GmDocumentBanner &&
                        pos_Click(&d->click).y - top_Rect(banRect) >
                            lineHeight_Text(banner_FontId) * 2) {
                        postCommand_App("document.info");
                    }
                    else {
                        postCommand_Widget(d, "navigate.root");
                    }
                }
            }
            return iTrue;
        case aborted_ClickResult:
            if (d->grabbedPlayer) {
                setGrabbedPlayer_DocumentWidget_(d, NULL);
                return iTrue;
            }
            return iTrue;
        default:
            break;
    }
    return processEvent_Widget(w, ev);
}

iDeclareType(DrawContext)

struct Impl_DrawContext {
    const iDocumentWidget *widget;
    iRect widgetBounds;
    iInt2 viewPos; /* document area origin */
    iPaint paint;
    iBool inSelectMark;
    iBool inFoundMark;
    iBool showLinkNumbers;
};

static void fillRange_DrawContext_(iDrawContext *d, const iGmRun *run, enum iColorId color,
                                   iRangecc mark, iBool *isInside) {
    if (mark.start > mark.end) {
        /* Selection may be done in either direction. */
        iSwap(const char *, mark.start, mark.end);
    }
    if (*isInside || (contains_Range(&run->text, mark.start) ||
                      contains_Range(&mark, run->text.start))) {
        int x = 0;
        if (!*isInside) {
            x = advanceRange_Text(run->font,
                                  (iRangecc){ run->text.start, iMax(run->text.start, mark.start) })
                    .x;
        }
        int w = width_Rect(run->visBounds) - x;
        if (contains_Range(&run->text, mark.end) || mark.end < run->text.start) {
            w = advanceRange_Text(
                    run->font,
                    !*isInside ? mark
                               : (iRangecc){ run->text.start, iMax(run->text.start, mark.end) })
                    .x;
            *isInside = iFalse;
        }
        else {
            *isInside = iTrue; /* at least until the next run */
        }
        if (w > width_Rect(run->visBounds) - x) {
            w = width_Rect(run->visBounds) - x;
        }
        if (~run->flags & decoration_GmRunFlag) {
            const iInt2 visPos =
                add_I2(run->bounds.pos, addY_I2(d->viewPos, -value_Anim(&d->widget->scrollY)));
            fillRect_Paint(&d->paint, (iRect){ addX_I2(visPos, x),
                                               init_I2(w, height_Rect(run->bounds)) }, color);
        }
    }
    /* Link URLs are not part of the visible document, so they are ignored above. Handle
       these ranges as a special case. */
    if (run->linkId && run->flags & decoration_GmRunFlag) {
        const iRangecc url = linkUrlRange_GmDocument(d->widget->doc, run->linkId);
        if (contains_Range(&url, mark.start) &&
            (contains_Range(&url, mark.end) || url.end == mark.end)) {
            fillRect_Paint(
                &d->paint,
                moved_Rect(run->visBounds, addY_I2(d->viewPos, -value_Anim(&d->widget->scrollY))),
                color);
        }
    }
}

static void drawMark_DrawContext_(void *context, const iGmRun *run) {
    iDrawContext *d = context;
    if (run->mediaType == none_GmRunMediaType) {
        fillRange_DrawContext_(d, run, uiMatching_ColorId, d->widget->foundMark, &d->inFoundMark);
        fillRange_DrawContext_(d, run, uiMarked_ColorId, d->widget->selectMark, &d->inSelectMark);
    }
}

static void drawBannerRun_DrawContext_(iDrawContext *d, const iGmRun *run, iInt2 visPos) {
    const iGmDocument *doc  = d->widget->doc;
    const iChar        icon = siteIcon_GmDocument(doc);
    iString            str;
    init_String(&str);
    iInt2 bpos = add_I2(visPos, init_I2(0, lineHeight_Text(banner_FontId) / 2));
    if (icon) {
        appendChar_String(&str, icon);
        const iRect iconRect = visualBounds_Text(run->font, range_String(&str));
        drawRange_Text(
            run->font,
            addY_I2(bpos, -mid_Rect(iconRect).y + lineHeight_Text(run->font) / 2),
            tmBannerIcon_ColorId,
            range_String(&str));
        bpos.x += right_Rect(iconRect) + 3 * gap_Text;
    }
    drawRange_Text(run->font,
                   bpos,
                   tmBannerTitle_ColorId,
                   bannerText_DocumentWidget_(d->widget));
    if (bannerType_GmDocument(doc) == certificateWarning_GmDocumentBanner) {
        const int domainHeight = lineHeight_Text(banner_FontId) * 2;
        iRect rect = { add_I2(visPos, init_I2(0, domainHeight)),
                       addY_I2(run->visBounds.size, -domainHeight - lineHeight_Text(uiContent_FontId)) };
        format_String(&str, "${heading.certwarn}");
        const int certFlags = d->widget->certFlags;
        if (certFlags & timeVerified_GmCertFlag && certFlags & domainVerified_GmCertFlag) {
            iUrl parts;
            init_Url(&parts, d->widget->mod.url);
            const iTime oldUntil = domainValidUntil_GmCerts(certs_App(), parts.host);
            iDate exp;
            init_Date(&exp, &oldUntil);
            iTime now;
            initCurrent_Time(&now);
            const int days = secondsSince_Time(&oldUntil, &now) / 3600 / 24;
            appendCStr_String(&str, "\n");
            if (days <= 30) {
                appendCStr_String(&str,
                                  format_CStr(cstrCount_Lang("dlg.certwarn.mayberenewed.n", days),
                                              cstrCollect_String(format_Date(&exp, "%Y-%m-%d")),
                                              days));
            }
            else {
                appendCStr_String(&str, cstr_Lang("dlg.certwarn.different"));
            }
        }
        else if (certFlags & domainVerified_GmCertFlag) {
            appendCStr_String(&str, "\n");
            appendFormat_String(&str, cstr_Lang("dlg.certwarn.expired"),
                                cstrCollect_String(format_Date(&d->widget->certExpiry, "%Y-%m-%d")));
        }
        else if (certFlags & timeVerified_GmCertFlag) {
            appendCStr_String(&str, "\n");
            appendFormat_String(&str, cstr_Lang("dlg.certwarn.domain"),
                                cstr_String(d->widget->certSubject));
        }
        else {
            appendCStr_String(&str, "\n");
            appendCStr_String(&str, cstr_Lang("dlg.certwarn.domain.expired"));
        }
        const iInt2 dims = advanceWrapRange_Text(
            uiContent_FontId, width_Rect(rect) - 16 * gap_UI, range_String(&str));
        const int warnHeight = run->visBounds.size.y - domainHeight;
        const int yOff = (lineHeight_Text(uiLabelLarge_FontId) -
                          lineHeight_Text(uiContent_FontId)) / 2;
        const iRect bgRect =
            init_Rect(0, visPos.y + domainHeight, d->widgetBounds.size.x, warnHeight);
        fillRect_Paint(&d->paint, bgRect, orange_ColorId);
        if (!isDark_ColorTheme(colorTheme_App())) {
            drawHLine_Paint(&d->paint,
                            topLeft_Rect(bgRect), width_Rect(bgRect), tmBannerTitle_ColorId);
            drawHLine_Paint(&d->paint,
                            bottomLeft_Rect(bgRect), width_Rect(bgRect), tmBannerTitle_ColorId);
        }
        const int fg = black_ColorId;
        adjustEdges_Rect(&rect, warnHeight / 2 - dims.y / 2 - yOff, 0, 0, 0);
        bpos = topLeft_Rect(rect);
        draw_Text(uiLabelLarge_FontId, bpos, fg, "\u26a0");
        adjustEdges_Rect(&rect, 0, -8 * gap_UI, 0, 8 * gap_UI);
        translate_Lang(&str);
        drawWrapRange_Text(uiContent_FontId,
                           addY_I2(topLeft_Rect(rect), yOff),
                           width_Rect(rect),
                           fg,
                           range_String(&str));
    }
    deinit_String(&str);
}

static void drawRun_DrawContext_(void *context, const iGmRun *run) {
    iDrawContext *d      = context;
    const iInt2   origin = d->viewPos;
    if (run->mediaType == image_GmRunMediaType) {
        SDL_Texture *tex = imageTexture_Media(media_GmDocument(d->widget->doc), run->mediaId);
        const iRect dst = moved_Rect(run->visBounds, origin);
        if (tex) {
            fillRect_Paint(&d->paint, dst, tmBackground_ColorId); /* in case the image has alpha */
            SDL_RenderCopy(d->paint.dst->render, tex, NULL,
                           &(SDL_Rect){ dst.pos.x, dst.pos.y, dst.size.x, dst.size.y });
        }
        else {
            drawRect_Paint(&d->paint, dst, tmQuoteIcon_ColorId);
            drawCentered_Text(uiLabel_FontId,
                              dst,
                              iFalse,
                              tmQuote_ColorId,
                              explosion_Icon "  Error Loading Image");
        }
        return;
    }
    else if (run->mediaType) {
        /* Media UIs are drawn afterwards as a dynamic overlay. */
        return;
    }
    enum iColorId      fg  = run->color;
    const iGmDocument *doc = d->widget->doc;
    iBool              isHover =
        (run->linkId && d->widget->hoverLink && run->linkId == d->widget->hoverLink->linkId &&
         ~run->flags & decoration_GmRunFlag);
    /* On mobile, links are not hovered unless a finger is touching. */ 
    if (deviceType_App() != desktop_AppDeviceType) {
        if (numFingers_Touch() == 0) {
            isHover = iFalse;
        }
    }
    const iInt2 visPos = addX_I2(add_I2(run->visBounds.pos, origin),
                                 /* Preformatted runs can be scrolled. */
                                 runOffset_DocumentWidget_(d->widget, run));
    if (run->flags & footer_GmRunFlag) {
        iRect footerBack =
            (iRect){ visPos, init_I2(width_Rect(d->widgetBounds), run->visBounds.size.y) };
        footerBack.pos.x = left_Rect(d->widgetBounds);
        fillRect_Paint(&d->paint, footerBack, tmBackground_ColorId);
        return;
    }
    fillRect_Paint(&d->paint, (iRect){ visPos, run->visBounds.size }, tmBackground_ColorId);
    if (run->linkId && ~run->flags & decoration_GmRunFlag) {
        fg = linkColor_GmDocument(doc, run->linkId, isHover ? textHover_GmLinkPart : text_GmLinkPart);
        if (linkFlags_GmDocument(doc, run->linkId) & content_GmLinkFlag) {
            fg = linkColor_GmDocument(doc, run->linkId, textHover_GmLinkPart); /* link is inactive */
        }
    }
    if (run->flags & altText_GmRunFlag) {
        const iInt2 margin = preRunMargin_GmDocument(doc, run->preId);
        fillRect_Paint(&d->paint, (iRect){ visPos, run->visBounds.size }, tmAltTextBackground_ColorId);
        drawRect_Paint(&d->paint, (iRect){ visPos, run->visBounds.size }, tmQuoteIcon_ColorId);
        drawWrapRange_Text(run->font, add_I2(visPos, margin),
                           run->visBounds.size.x - 2 * margin.x, run->color, run->text);
    }
    else if (run->flags & siteBanner_GmRunFlag) {
        /* Banner background. */
        iRect bannerBack = initCorners_Rect(topLeft_Rect(d->widgetBounds),
                                            init_I2(right_Rect(bounds_Widget(constAs_Widget(d->widget))),
                                                    visPos.y + height_Rect(run->visBounds)));
        fillRect_Paint(&d->paint, bannerBack, tmBannerBackground_ColorId);
        drawBannerRun_DrawContext_(d, run, visPos);
    }
    else {
        if (d->showLinkNumbers && run->linkId && run->flags & decoration_GmRunFlag) {
            const size_t ord = visibleLinkOrdinal_DocumentWidget_(d->widget, run->linkId);
            if (ord >= d->widget->ordinalBase) {
                const iChar ordChar =
                    linkOrdinalChar_DocumentWidget_(d->widget, ord - d->widget->ordinalBase);
                if (ordChar) {
                    drawString_Text(run->font,
                                    init_I2(d->viewPos.x - gap_UI / 3, visPos.y),
                                    tmQuote_ColorId,
                                    collect_String(newUnicodeN_String(&ordChar, 1)));
                    goto runDrawn;
                }
            }
        }
        if (run->flags & quoteBorder_GmRunFlag) {
            drawVLine_Paint(&d->paint,
                            addX_I2(visPos, -gap_Text * 5 / 2),
                            height_Rect(run->visBounds),
                            tmQuoteIcon_ColorId);
        }
        drawBoundRange_Text(run->font, visPos, width_Rect(run->bounds), fg, run->text);
    runDrawn:;
    }
    /* Presentation of links. */
    if (run->linkId && ~run->flags & decoration_GmRunFlag) {
        const int metaFont = paragraph_FontId;
        /* TODO: Show status of an ongoing media request. */
        const int flags = linkFlags_GmDocument(doc, run->linkId);
        const iRect linkRect = moved_Rect(run->visBounds, origin);
        iMediaRequest *mr = NULL;
        /* Show metadata about inline content. */
        if (flags & content_GmLinkFlag && run->flags & endOfLine_GmRunFlag) {
            fg = linkColor_GmDocument(doc, run->linkId, textHover_GmLinkPart);
            iString text;
            init_String(&text);
            iMediaId imageId = linkImage_GmDocument(doc, run->linkId);
            iMediaId audioId = !imageId ? linkAudio_GmDocument(doc, run->linkId) : 0;
            iMediaId downloadId = !imageId && !audioId ?
                findLinkDownload_Media(constMedia_GmDocument(doc), run->linkId) : 0;
            iAssert(imageId || audioId || downloadId);
            if (imageId) {
                iAssert(!isEmpty_Rect(run->bounds));
                iGmMediaInfo info;
                imageInfo_Media(constMedia_GmDocument(doc), imageId, &info);
                const iInt2 imgSize = imageSize_Media(constMedia_GmDocument(doc), imageId);
                format_String(&text, "%s \u2014 %d x %d \u2014 %.1f%s",
                              info.type, imgSize.x, imgSize.y, info.numBytes / 1.0e6f,
                              cstr_Lang("mb"));
            }
            else if (audioId) {
                iGmMediaInfo info;
                audioInfo_Media(constMedia_GmDocument(doc), audioId, &info);
                format_String(&text, "%s", info.type);
            }
            else if (downloadId) {
                iGmMediaInfo info;
                downloadInfo_Media(constMedia_GmDocument(doc), downloadId, &info);
                format_String(&text, "%s", info.type);
            }
            if (findMediaRequest_DocumentWidget_(d->widget, run->linkId)) {
                appendFormat_String(
                    &text, "  %s" close_Icon, isHover ? escape_Color(tmLinkText_ColorId) : "");
            }
            const iInt2 size = measureRange_Text(metaFont, range_String(&text));
            fillRect_Paint(
                &d->paint,
                (iRect){ add_I2(origin, addX_I2(topRight_Rect(run->bounds), -size.x - gap_UI)),
                         addX_I2(size, 2 * gap_UI) },
                tmBackground_ColorId);
            drawAlign_Text(metaFont,
                           add_I2(topRight_Rect(run->bounds), origin),
                           fg,
                           right_Alignment,
                           "%s", cstr_String(&text));
            deinit_String(&text);
        }
        else if (run->flags & endOfLine_GmRunFlag &&
                 (mr = findMediaRequest_DocumentWidget_(d->widget, run->linkId)) != NULL) {
            if (!isFinished_GmRequest(mr->req)) {
                draw_Text(metaFont,
                          topRight_Rect(linkRect),
                          tmInlineContentMetadata_ColorId,
                          translateCStr_Lang(" \u2014 ${doc.fetching}\u2026 (%.1f ${mb})"),
                          (float) bodySize_GmRequest(mr->req) / 1.0e6f);
            }
        }
        else if (isHover) {
            const iGmLinkId linkId = d->widget->hoverLink->linkId;
            const iString * url    = linkUrl_GmDocument(doc, linkId);
            const int       flags  = linkFlags_GmDocument(doc, linkId);
            iUrl parts;
            init_Url(&parts, url);
            fg                    = linkColor_GmDocument(doc, linkId, textHover_GmLinkPart);
            const iBool showHost  = (flags & humanReadable_GmLinkFlag &&
                                    (!isEmpty_Range(&parts.host) || flags & mailto_GmLinkFlag));
            const iBool showImage = (flags & imageFileExtension_GmLinkFlag) != 0;
            const iBool showAudio = (flags & audioFileExtension_GmLinkFlag) != 0;
            iString str;
            init_String(&str);
            /* Show scheme and host. */
            if (run->flags & endOfLine_GmRunFlag &&
                (flags & (imageFileExtension_GmLinkFlag | audioFileExtension_GmLinkFlag) ||
                 showHost)) {
                format_String(
                    &str,
                    " \u2014%s%s%s%s%s",
                    showHost ? " " : "",
                    showHost
                        ? (flags & mailto_GmLinkFlag    ? cstr_String(url)
                           : ~flags & gemini_GmLinkFlag ? format_CStr("%s://%s",
                                                                      cstr_Rangecc(parts.scheme),
                                                                      cstr_Rangecc(parts.host))
                                                        : cstr_Rangecc(parts.host))
                        : "",
                    showHost && (showImage || showAudio) ? " \u2014" : "",
                    showImage || showAudio
                        ? escape_Color(fg)
                        : escape_Color(linkColor_GmDocument(doc, run->linkId, domain_GmLinkPart)),
                    showImage || showAudio
                        ? format_CStr(showImage ? " %s \U0001f5bb" : " %s \U0001f3b5",
                                      cstr_Lang(showImage ? "link.hint.image" : "link.hint.audio"))
                        : "");
            }
            if (run->flags & endOfLine_GmRunFlag && flags & visited_GmLinkFlag) {
                iDate date;
                init_Date(&date, linkTime_GmDocument(doc, run->linkId));
                appendCStr_String(&str, " \u2014 ");
                appendCStr_String(
                    &str, escape_Color(linkColor_GmDocument(doc, run->linkId, visited_GmLinkPart)));
                append_String(&str, collect_String(format_Date(&date, "%b %d")));
            }
            if (!isEmpty_String(&str)) {
                const iInt2 textSize = measure_Text(metaFont, cstr_String(&str));
                int tx = topRight_Rect(linkRect).x;
                const char *msg = cstr_String(&str);
                if (tx + textSize.x > right_Rect(d->widgetBounds)) {
                    tx = right_Rect(d->widgetBounds) - textSize.x;
                    fillRect_Paint(&d->paint, (iRect){ init_I2(tx, top_Rect(linkRect)), textSize },
                                   uiBackground_ColorId);
                    msg += 4; /* skip the space and dash */
                    tx += measure_Text(metaFont, " \u2014").x / 2;
                }
                drawAlign_Text(metaFont,
                               init_I2(tx, top_Rect(linkRect)),
                               linkColor_GmDocument(doc, run->linkId, domain_GmLinkPart),
                               left_Alignment,
                               "%s",
                               msg);
                deinit_String(&str);
            }
        }
    }
//    drawRect_Paint(&d->paint, (iRect){ visPos, run->bounds.size }, green_ColorId);
//    drawRect_Paint(&d->paint, (iRect){ visPos, run->visBounds.size }, red_ColorId);
}

static int drawSideRect_(iPaint *p, iRect rect) {
    int bg = tmBannerBackground_ColorId;
    int fg = tmBannerIcon_ColorId;
    if (equal_Color(get_Color(bg), get_Color(tmBackground_ColorId))) {
        bg = tmBannerIcon_ColorId;
        fg = tmBannerBackground_ColorId;
    }
    fillRect_Paint(p, rect, bg);
    return fg;
}

static int sideElementAvailWidth_DocumentWidget_(const iDocumentWidget *d) {
    return left_Rect(documentBounds_DocumentWidget_(d)) -
           left_Rect(bounds_Widget(constAs_Widget(d))) - 2 * d->pageMargin * gap_UI;
}

static iBool isSideHeadingVisible_DocumentWidget_(const iDocumentWidget *d) {
    return sideElementAvailWidth_DocumentWidget_(d) >= lineHeight_Text(banner_FontId) * 4.5f;
}

static void updateSideIconBuf_DocumentWidget_(const iDocumentWidget *d) {
    if (!isExposed_Window(get_Window())) {
        return;
    }
    iDrawBufs *dbuf = d->drawBufs;
    dbuf->flags &= ~updateSideBuf_DrawBufsFlag;
    if (dbuf->sideIconBuf) {
        SDL_DestroyTexture(dbuf->sideIconBuf);
        dbuf->sideIconBuf = NULL;
    }
    const iGmRun *banner = siteBanner_GmDocument(d->doc);
    if (!banner) {
        return;
    }
    const int   margin           = gap_UI * d->pageMargin;
    const int   minBannerSize    = lineHeight_Text(banner_FontId) * 2;
    const iChar icon             = siteIcon_GmDocument(d->doc);
    const int   avail            = sideElementAvailWidth_DocumentWidget_(d) - margin;
    iBool       isHeadingVisible = isSideHeadingVisible_DocumentWidget_(d);
    /* Determine the required size. */
    iInt2 bufSize = init1_I2(minBannerSize);
    if (isHeadingVisible) {
        const iInt2 headingSize = advanceWrapRange_Text(heading3_FontId, avail,
                                                        currentHeading_DocumentWidget_(d));
        if (headingSize.x > 0) {
            bufSize.y += gap_Text + headingSize.y;
            bufSize.x = iMax(bufSize.x, headingSize.x);
        }
        else {
            isHeadingVisible = iFalse;
        }
    }
    SDL_Renderer *render = renderer_Window(get_Window());
    dbuf->sideIconBuf = SDL_CreateTexture(render,
                                          SDL_PIXELFORMAT_RGBA4444,
                                          SDL_TEXTUREACCESS_STATIC | SDL_TEXTUREACCESS_TARGET,
                                          bufSize.x, bufSize.y);
    iPaint p;
    init_Paint(&p);
    beginTarget_Paint(&p, dbuf->sideIconBuf);
    const iColor back = get_Color(tmBannerSideTitle_ColorId);
    SDL_SetRenderDrawColor(render, back.r, back.g, back.b, 0); /* better blending of the edge */
    SDL_RenderClear(render);
    const iRect iconRect = { zero_I2(), init1_I2(minBannerSize) };
    int fg = drawSideRect_(&p, iconRect);
    iString str;
    initUnicodeN_String(&str, &icon, 1);
    drawCentered_Text(banner_FontId, iconRect, iTrue, fg, "%s", cstr_String(&str));
    deinit_String(&str);
    if (isHeadingVisible) {
        iRangecc    text = currentHeading_DocumentWidget_(d);
        iInt2       pos  = addY_I2(bottomLeft_Rect(iconRect), gap_Text);
        const int   font = heading3_FontId;
        drawWrapRange_Text(font, pos, avail, tmBannerSideTitle_ColorId, text);
    }
    endTarget_Paint(&p);
    SDL_SetTextureBlendMode(dbuf->sideIconBuf, SDL_BLENDMODE_BLEND);
}

static void drawSideElements_DocumentWidget_(const iDocumentWidget *d) {
    const iWidget *w         = constAs_Widget(d);
    const iRect    bounds    = bounds_Widget(w);
    const iRect    docBounds = documentBounds_DocumentWidget_(d);
    const int      margin    = gap_UI * d->pageMargin;
    float          opacity   = value_Anim(&d->sideOpacity);
    const int      avail     = left_Rect(docBounds) - left_Rect(bounds) - 2 * margin;
    iDrawBufs *    dbuf      = d->drawBufs;
    iPaint         p;
    init_Paint(&p);
    setClip_Paint(&p, bounds);
    /* Side icon and current heading. */
    if (prefs_App()->sideIcon && opacity > 0 && dbuf->sideIconBuf) {
        const iInt2 texSize = size_SDLTexture(dbuf->sideIconBuf);
        if (avail > texSize.x) {
            const int minBannerSize = lineHeight_Text(banner_FontId) * 2;
            iInt2 pos = addY_I2(add_I2(topLeft_Rect(bounds), init_I2(margin, 0)),
                                height_Rect(bounds) / 2 - minBannerSize / 2 -
                                    (texSize.y > minBannerSize
                                         ? (gap_Text + lineHeight_Text(heading3_FontId)) / 2
                                         : 0));
            SDL_SetTextureAlphaMod(dbuf->sideIconBuf, 255 * opacity);
            SDL_RenderCopy(renderer_Window(get_Window()),
                           dbuf->sideIconBuf, NULL,
                           &(SDL_Rect){ pos.x, pos.y, texSize.x, texSize.y });
        }
    }
    /* Reception timestamp. */
    if (dbuf->timestampBuf && dbuf->timestampBuf->size.x <= avail) {
        draw_TextBuf(
            dbuf->timestampBuf,
            add_I2(
                bottomLeft_Rect(bounds),
                init_I2(margin,
                        -margin + -dbuf->timestampBuf->size.y +
                            iMax(0, scrollMax_DocumentWidget_(d) - value_Anim(&d->scrollY)))),
            tmQuoteIcon_ColorId);
    }
    unsetClip_Paint(&p);
}

static void drawMedia_DocumentWidget_(const iDocumentWidget *d, iPaint *p) {
    iConstForEach(PtrArray, i, &d->visibleMedia) {
        const iGmRun * run = i.ptr;
        if (run->mediaType == audio_GmRunMediaType) {
            iPlayerUI ui;
            init_PlayerUI(&ui,
                          audioPlayer_Media(media_GmDocument(d->doc), run->mediaId),
                          runRect_DocumentWidget_(d, run));
            draw_PlayerUI(&ui, p);
        }
        else if (run->mediaType == download_GmRunMediaType) {
            iDownloadUI ui;
            init_DownloadUI(&ui, d, run->mediaId, runRect_DocumentWidget_(d, run));
            draw_DownloadUI(&ui, p);
        }
    }
}

static void draw_DocumentWidget_(const iDocumentWidget *d) {
    const iWidget *w        = constAs_Widget(d);
    const iRect    bounds   = bounds_Widget(w);
    iVisBuf *      visBuf   = d->visBuf; /* will be updated now */
    if (width_Rect(bounds) <= 0) {
        return;
    }
    draw_Widget(w);
    if (d->drawBufs->flags & updateTimestampBuf_DrawBufsFlag) {
        updateTimestampBuf_DocumentWidget_(d);
    }
    if (d->drawBufs->flags & updateSideBuf_DrawBufsFlag) {
        updateSideIconBuf_DocumentWidget_(d);
    }
    allocVisBuffer_DocumentWidget_(d);
    const iRect ctxWidgetBounds = init_Rect(
        0, 0, width_Rect(bounds) - constAs_Widget(d->scroll)->rect.size.x, height_Rect(bounds));
    const iRect  docBounds = documentBounds_DocumentWidget_(d);
    iDrawContext ctx       = {
        .widget          = d,
        .showLinkNumbers = (d->flags & showLinkNumbers_DocumentWidgetFlag) != 0,
    };
    /* Currently visible region. */
    const iRangei vis  = visibleRange_DocumentWidget_(d);
    const iRangei full = { 0, size_GmDocument(d->doc).y };
    reposition_VisBuf(visBuf, vis);
    iRangei invalidRange[iElemCount(d->visBuf->buffers)];
    invalidRanges_VisBuf(visBuf, full, invalidRange);
    /* Redraw the invalid ranges. */ {
        iPaint *p = &ctx.paint;
        init_Paint(p);
        iForIndices(i, visBuf->buffers) {
            iVisBufTexture *buf = &visBuf->buffers[i];
            ctx.widgetBounds = moved_Rect(ctxWidgetBounds, init_I2(0, -buf->origin));
            ctx.viewPos      = init_I2(left_Rect(docBounds) - left_Rect(bounds), -buf->origin);
            if (!isEmpty_Rangei(invalidRange[i])) {
                beginTarget_Paint(p, buf->texture);
                if (isEmpty_Rangei(buf->validRange)) {
                    fillRect_Paint(p, (iRect){ zero_I2(), visBuf->texSize }, tmBackground_ColorId);
                }
                render_GmDocument(d->doc, invalidRange[i], drawRun_DrawContext_, &ctx);
            }
            /* Draw any invalidated runs that fall within this buffer. */ {
                const iRangei bufRange = { buf->origin, buf->origin + visBuf->texSize.y };
                /* Clear full-width backgrounds first in case there are any dynamic elements. */ {
                    iConstForEach(PtrSet, r, d->invalidRuns) {
                        const iGmRun *run = *r.value;
                        if (isOverlapping_Rangei(bufRange, ySpan_Rect(run->visBounds))) {
                            beginTarget_Paint(p, buf->texture);
                            fillRect_Paint(&ctx.paint,
                                           init_Rect(0,
                                                     run->visBounds.pos.y - buf->origin,
                                                     visBuf->texSize.x,
                                                     run->visBounds.size.y),
                                           tmBackground_ColorId);
                        }
                    }
                }
                iConstForEach(PtrSet, r, d->invalidRuns) {
                    const iGmRun *run = *r.value;
                    if (isOverlapping_Rangei(bufRange, ySpan_Rect(run->visBounds))) {
                        beginTarget_Paint(p, buf->texture);
                        drawRun_DrawContext_(&ctx, run);
                    }
                }
            }
            endTarget_Paint(&ctx.paint);
        }
        validate_VisBuf(visBuf);
        clear_PtrSet(d->invalidRuns);
    }
    setClip_Paint(&ctx.paint, bounds);
    const int yTop = docBounds.pos.y - value_Anim(&d->scrollY);
    draw_VisBuf(visBuf, init_I2(bounds.pos.x, yTop));
    /* Text markers. */
    if (!isEmpty_Range(&d->foundMark) || !isEmpty_Range(&d->selectMark)) {
        SDL_SetRenderDrawBlendMode(renderer_Window(get_Window()),
                                   isDark_ColorTheme(colorTheme_App()) ? SDL_BLENDMODE_ADD
                                                                       : SDL_BLENDMODE_BLEND);
        ctx.viewPos = topLeft_Rect(docBounds);
        /* Marker starting outside the visible range? */
        if (d->firstVisibleRun) {
            if (!isEmpty_Range(&d->selectMark) &&
                d->selectMark.start < d->firstVisibleRun->text.start &&
                d->selectMark.end > d->firstVisibleRun->text.start) {
                ctx.inSelectMark = iTrue;
            }
            if (isEmpty_Range(&d->foundMark) &&
                d->foundMark.start < d->firstVisibleRun->text.start &&
                d->foundMark.end > d->firstVisibleRun->text.start) {
                ctx.inFoundMark = iTrue;
            }
        }
        render_GmDocument(d->doc, vis, drawMark_DrawContext_, &ctx);
        SDL_SetRenderDrawBlendMode(renderer_Window(get_Window()), SDL_BLENDMODE_NONE);
    }
    drawMedia_DocumentWidget_(d, &ctx.paint);
    unsetClip_Paint(&ctx.paint);
    /* Fill the top and bottom, in case the document is short. */
    if (yTop > top_Rect(bounds)) {
        fillRect_Paint(&ctx.paint,
                       (iRect){ bounds.pos, init_I2(bounds.size.x, yTop - top_Rect(bounds)) },
                       hasSiteBanner_GmDocument(d->doc) ? tmBannerBackground_ColorId
                                                        : tmBackground_ColorId);
    }
    const int yBottom = yTop + size_GmDocument(d->doc).y + 1;
    if (yBottom < bottom_Rect(bounds)) {
        fillRect_Paint(&ctx.paint,
                       init_Rect(bounds.pos.x, yBottom, bounds.size.x, bottom_Rect(bounds) - yBottom),
                       tmBackground_ColorId);
    }
    drawSideElements_DocumentWidget_(d);
    if (prefs_App()->hoverLink && d->hoverLink) {
        const int      font     = uiLabel_FontId;
        const iRangecc linkUrl  = range_String(linkUrl_GmDocument(d->doc, d->hoverLink->linkId));
        const iInt2    size     = measureRange_Text(font, linkUrl);
        const iRect    linkRect = { addY_I2(bottomLeft_Rect(bounds), -size.y),
                                    addX_I2(size, 2 * gap_UI) };
        fillRect_Paint(&ctx.paint, linkRect, tmBackground_ColorId);
        drawRange_Text(font, addX_I2(topLeft_Rect(linkRect), gap_UI), tmParagraph_ColorId, linkUrl);
    }
    if (colorTheme_App() == pureWhite_ColorTheme) {
        drawHLine_Paint(&ctx.paint, topLeft_Rect(bounds), width_Rect(bounds), uiSeparator_ColorId);
    }
    draw_Widget(w);
    /* Alt text. */
    const float altTextOpacity = value_Anim(&d->altTextOpacity) * 6 - 5;
    if (d->hoverAltPre && altTextOpacity > 0) {
        const iGmPreMeta *meta = preMeta_GmDocument(d->doc, d->hoverAltPre->preId);
        if (meta->flags & topLeft_GmPreMetaFlag && ~meta->flags & decoration_GmRunFlag &&
            !isEmpty_Range(&meta->altText)) {
            const int   margin   = 3 * gap_UI / 2;
            const int   altFont  = uiLabel_FontId;
            const int   wrap     = docBounds.size.x - 2 * margin;
            iInt2 pos            = addY_I2(add_I2(docBounds.pos, meta->pixelRect.pos),
                                           -value_Anim(&d->scrollY));
            const iInt2 textSize = advanceWrapRange_Text(altFont, wrap, meta->altText);
            pos.y -= textSize.y + gap_UI;
            pos.y               = iMax(pos.y, top_Rect(bounds));
            const iRect altRect = { pos, init_I2(docBounds.size.x, textSize.y) };
            ctx.paint.alpha     = altTextOpacity * 255;
            if (altTextOpacity < 1) {
                SDL_SetRenderDrawBlendMode(renderer_Window(get_Window()), SDL_BLENDMODE_BLEND);
            }
            fillRect_Paint(&ctx.paint, altRect, tmAltTextBackground_ColorId);
            drawRect_Paint(&ctx.paint, altRect, tmQuoteIcon_ColorId);
            setOpacity_Text(altTextOpacity);
            drawWrapRange_Text(altFont, addX_I2(pos, margin), wrap,
                               tmQuote_ColorId, meta->altText);
            SDL_SetRenderDrawBlendMode(renderer_Window(get_Window()), SDL_BLENDMODE_NONE);
            setOpacity_Text(1.0f);
        }
    }
}

/*----------------------------------------------------------------------------------------------*/

iHistory *history_DocumentWidget(iDocumentWidget *d) {
    return d->mod.history;
}

const iString *url_DocumentWidget(const iDocumentWidget *d) {
    return d->mod.url;
}

const iGmDocument *document_DocumentWidget(const iDocumentWidget *d) {
    return d->doc;
}

const iBlock *sourceContent_DocumentWidget(const iDocumentWidget *d) {
    return &d->sourceContent;
}

int documentWidth_DocumentWidget(const iDocumentWidget *d) {
    return documentWidth_DocumentWidget_(d);
}

const iString *feedTitle_DocumentWidget(const iDocumentWidget *d) {
    if (!isEmpty_String(title_GmDocument(d->doc))) {
        return title_GmDocument(d->doc);
    }
    return bookmarkTitle_DocumentWidget(d);
}

const iString *bookmarkTitle_DocumentWidget(const iDocumentWidget *d) {
    iStringArray *title = iClob(new_StringArray());
    if (!isEmpty_String(title_GmDocument(d->doc))) {
        pushBack_StringArray(title, title_GmDocument(d->doc));
    }
    if (!isEmpty_String(d->titleUser)) {
        pushBack_StringArray(title, d->titleUser);
    }
    if (isEmpty_StringArray(title)) {
        iUrl parts;
        init_Url(&parts, d->mod.url);
        if (!isEmpty_Range(&parts.host)) {
            pushBackRange_StringArray(title, parts.host);
        }
    }
    if (isEmpty_StringArray(title)) {
        pushBackCStr_StringArray(title, cstr_Lang("bookmark.title.blank"));
    }
    return collect_String(joinCStr_StringArray(title, " \u2014 "));
}

void serializeState_DocumentWidget(const iDocumentWidget *d, iStream *outs) {
    serialize_PersistentDocumentState(&d->mod, outs);
}

void deserializeState_DocumentWidget(iDocumentWidget *d, iStream *ins) {
    deserialize_PersistentDocumentState(&d->mod, ins);
    parseUser_DocumentWidget_(d);
    updateFromHistory_DocumentWidget_(d);
}

void setUrlFromCache_DocumentWidget(iDocumentWidget *d, const iString *url, iBool isFromCache) {
    setLinkNumberMode_DocumentWidget_(d, iFalse);
    set_String(d->mod.url, urlFragmentStripped_String(url));
    /* See if there a username in the URL. */
    parseUser_DocumentWidget_(d);
    if (!isFromCache || !updateFromHistory_DocumentWidget_(d)) {
        fetch_DocumentWidget_(d);
    }
}

iDocumentWidget *duplicate_DocumentWidget(const iDocumentWidget *orig) {
    iDocumentWidget *d = new_DocumentWidget();
    delete_History(d->mod.history);
    d->initNormScrollY = normScrollPos_DocumentWidget_(d);
    d->mod.history = copy_History(orig->mod.history);
    setUrlFromCache_DocumentWidget(d, orig->mod.url, iTrue);
    return d;
}

void setUrl_DocumentWidget(iDocumentWidget *d, const iString *url) {
    setUrlFromCache_DocumentWidget(d, url, iFalse);
}

void setInitialScroll_DocumentWidget(iDocumentWidget *d, float normScrollY) {
    d->initNormScrollY = normScrollY;
}

void setRedirectCount_DocumentWidget(iDocumentWidget *d, int count) {
    d->redirectCount = count;
}

iBool isRequestOngoing_DocumentWidget(const iDocumentWidget *d) {
    return d->request != NULL;
}

void updateSize_DocumentWidget(iDocumentWidget *d) {
    updateDocumentWidthRetainingScrollPosition_DocumentWidget_(d, iFalse);
    resetWideRuns_DocumentWidget_(d);
    d->drawBufs->flags |= updateSideBuf_DrawBufsFlag;
    updateVisible_DocumentWidget_(d);
    invalidate_DocumentWidget_(d);
}

iBeginDefineSubclass(DocumentWidget, Widget)
    .processEvent = (iAny *) processEvent_DocumentWidget_,
    .draw         = (iAny *) draw_DocumentWidget_,
iEndDefineSubclass(DocumentWidget)