path: root/src/ui/window.c

/* 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. */

#include "window.h"

#include "labelwidget.h"
#include "inputwidget.h"
#include "documentwidget.h"
#include "sidebarwidget.h"
#include "lookupwidget.h"
#include "embedded.h"
#include "command.h"
#include "paint.h"
#include "util.h"
#include "keys.h"
#include "../app.h"
#include "../visited.h"
#include "../gmcerts.h"
#include "../gmutil.h"
#include "../visited.h"
#if defined (iPlatformMsys)
#   include "../win32.h"
#endif
#if defined (iPlatformApple) && !defined (iPlatformIOS)
#   include "macos.h"
#endif

#include <the_Foundation/file.h>
#include <the_Foundation/path.h>
#include <SDL_hints.h>
#include <SDL_timer.h>
#include <SDL_syswm.h>

#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"

static iWindow *theWindow_ = NULL;

#if defined (iPlatformApple)
static float initialUiScale_ = 1.0f;
#else
static float initialUiScale_ = 1.1f;
#endif

iDefineTypeConstructionArgs(Window, (iRect rect), rect)

static iBool handleRootCommands_(iWidget *root, const char *cmd) {
    iUnused(root);
    if (equal_Command(cmd, "menu.open")) {
        iWidget *button = pointer_Command(cmd);
        iWidget *menu = findChild_Widget(button, "menu");
        iAssert(menu);
        if (!isVisible_Widget(menu)) {
            openMenu_Widget(menu, init_I2(0, button->rect.size.y));
        }
        else {
            closeMenu_Widget(menu);
        }
        return iTrue;
    }
    else if (equal_Command(cmd, "focus.set")) {
        setFocus_Widget(findWidget_App(cstr_Rangecc(range_Command(cmd, "id"))));
        return iTrue;
    }
    else if (equal_Command(cmd, "window.focus.lost")) {
        setFocus_Widget(NULL);
        return iFalse;
    }
    else if (handleCommand_App(cmd)) {
        return iTrue;
    }
    return iFalse;
}

#if defined (iPlatformApple)
#  define iHaveNativeMenus
#endif

#if !defined (iHaveNativeMenus)
/* TODO: Submenus wouldn't hurt here. */
static const iMenuItem navMenuItems_[] = {
    { "New Tab", 't', KMOD_PRIMARY, "tabs.new" },
    { "Open Location...", SDLK_l, KMOD_PRIMARY, "navigate.focus" },
    { "---", 0, 0, NULL },
    { "Save to Downloads", SDLK_s, KMOD_PRIMARY, "document.save" },
    { "Copy Source Text", SDLK_c, KMOD_PRIMARY, "copy" },
    { "---", 0, 0, NULL },
    { "Toggle Left Sidebar", SDLK_l, KMOD_PRIMARY | KMOD_SHIFT, "sidebar.toggle" },
    { "Toggle Right Sidebar", SDLK_p, KMOD_PRIMARY | KMOD_SHIFT, "sidebar2.toggle" },
    { "Zoom In", SDLK_EQUALS, KMOD_PRIMARY, "zoom.delta arg:10" },
    { "Zoom Out", SDLK_MINUS, KMOD_PRIMARY, "zoom.delta arg:-10" },
    { "Reset Zoom", SDLK_0, KMOD_PRIMARY, "zoom.set arg:100" },
    { "---", 0, 0, NULL },
    { "List All Bookmarks", 0, 0, "!open url:about:bookmarks" },
    { "List Bookmarks by Tag", 0, 0, "!open url:about:bookmarks?tags" },
    { "List Bookmarks by Creation Time", 0, 0, "!open url:about:bookmarks?created" },
    { "---", 0, 0, NULL },
    { "Show Feed Entries", 0, 0, "!open url:about:feeds" },
    { "---", 0, 0, NULL },
    { "Preferences...", SDLK_COMMA, KMOD_PRIMARY, "preferences" },
    { "Help", SDLK_F1, 0, "!open url:about:help" },
    { "Release Notes", 0, 0, "!open url:about:version" },
    { "---", 0, 0, NULL },
    { "Quit Lagrange", 'q', KMOD_PRIMARY, "quit" }
};
#endif

#if defined (iHaveNativeMenus)
/* Using native menus. */
static const iMenuItem fileMenuItems_[] = {
    { "New Tab", SDLK_t, KMOD_PRIMARY, "tabs.new" },
    { "Open Location...", SDLK_l, KMOD_PRIMARY, "navigate.focus" },
    { "---", 0, 0, NULL },
    { "Save to Downloads", SDLK_s, KMOD_PRIMARY, "document.save" },
};

static const iMenuItem editMenuItems_[] = {
    { "Copy", SDLK_c, KMOD_PRIMARY, "copy" },
    { "Copy Link to Page", SDLK_c, KMOD_PRIMARY | KMOD_SHIFT, "document.copylink" },
    { "---", 0, 0, NULL },
    { "Find", SDLK_f, KMOD_PRIMARY, "focus.set id:find.input" },
};

static const iMenuItem viewMenuItems_[] = {
    { "Show Bookmarks", '1', KMOD_PRIMARY, "sidebar.mode arg:0 toggle:1" },
    { "Show Feeds", '2', KMOD_PRIMARY, "sidebar.mode arg:1 toggle:1" },
    { "Show History", '3', KMOD_PRIMARY, "sidebar.mode arg:2 toggle:1" },
    { "Show Identities", '4', KMOD_PRIMARY, "sidebar.mode arg:3 toggle:1" },
    { "Show Page Outline", '5', KMOD_PRIMARY, "sidebar.mode arg:4 toggle:1" },
    { "Toggle Left Sidebar", SDLK_l, KMOD_PRIMARY | KMOD_SHIFT, "sidebar.toggle" },
    { "Toggle Right Sidebar", SDLK_p, KMOD_PRIMARY | KMOD_SHIFT, "sidebar2.toggle" },
    { "---", 0, 0, NULL },
    { "Go Back", SDLK_LEFTBRACKET, KMOD_PRIMARY, "navigate.back" },
    { "Go Forward", SDLK_RIGHTBRACKET, KMOD_PRIMARY, "navigate.forward" },
    { "Go to Parent", navigateParent_KeyShortcut, "navigate.parent" },
    { "Go to Root", navigateRoot_KeyShortcut, "navigate.root" },
    { "Reload Page", reload_KeyShortcut, "navigate.reload" },
    { "---", 0, 0, NULL },
    { "Zoom In", SDLK_EQUALS, KMOD_PRIMARY, "zoom.delta arg:10" },
    { "Zoom Out", SDLK_MINUS, KMOD_PRIMARY, "zoom.delta arg:-10" },
    { "Reset Zoom", SDLK_0, KMOD_PRIMARY, "zoom.set arg:100" },
};

static iMenuItem bookmarksMenuItems_[] = {
    { "Bookmark This Page...", SDLK_d, KMOD_PRIMARY, "bookmark.add" },
    { "Import All Links on Page", 0, 0, "bookmark.links confirm:1" },
    { "---", 0, 0, NULL },
    { "List All", 0, 0, "open url:about:bookmarks" },
    { "List by Tag", 0, 0, "open url:about:bookmarks?tags" },
    { "List by Creation Time", 0, 0, "open url:about:bookmarks?created" },
    { "Refresh Remote Sources", 0, 0, "bookmarks.reload.remote" },
    { "---", 0, 0, NULL },
    { "Subscribe to This Page...", subscribeToPage_KeyModifier, "feeds.subscribe" },
    { "---", 0, 0, NULL },
    { "Show Feed Entries", 0, 0, "open url:about:feeds" },
    { "Refresh Feeds", SDLK_r, KMOD_PRIMARY | KMOD_SHIFT, "feeds.refresh" },
};

static const iMenuItem identityMenuItems_[] = {
    { "New Identity...", SDLK_n, KMOD_PRIMARY | KMOD_SHIFT, "ident.new" },
};

static const iMenuItem helpMenuItems_[] = {
    { "Help", 0, 0, "!open url:about:help" },
    { "Release Notes", 0, 0, "!open url:about:version" },
};
#endif

static const iMenuItem identityButtonMenuItems_[] = {
    { "No Active Identity", 0, 0, "ident.showactive" },
    { "---", 0, 0, NULL },
#if !defined (iHaveNativeMenus)
    { "New Identity...", SDLK_n, KMOD_PRIMARY | KMOD_SHIFT, "ident.new" },
    { "---", 0, 0, NULL },
    { "Show Identities", '4', KMOD_PRIMARY, "sidebar.mode arg:3 show:1" },
#else
    { "New Identity...", 0, 0, "ident.new" },
    { "---", 0, 0, NULL },
    { "Show Identities", 0, 0, "sidebar.mode arg:3 show:1" },
#endif
};

static const char *reloadCStr_ = "\U0001f503";

/* TODO: A preference for these, maybe? */
static const char *stopSeqCStr_[] = {
    /* Corners */
    uiTextCaution_ColorEscape "\U0000230c",
    uiTextCaution_ColorEscape "\U0000230d",
    uiTextCaution_ColorEscape "\U0000230f",
    uiTextCaution_ColorEscape "\U0000230e",
#if 0
    /* Rotating arrow */
    uiTextCaution_ColorEscape "\U00002b62",
    uiTextCaution_ColorEscape "\U00002b68",
    uiTextCaution_ColorEscape "\U00002b63",
    uiTextCaution_ColorEscape "\U00002b69",
    uiTextCaution_ColorEscape "\U00002b60",
    uiTextCaution_ColorEscape "\U00002b66",
    uiTextCaution_ColorEscape "\U00002b61",
    uiTextCaution_ColorEscape "\U00002b67",
#endif
#if 0
    /* Star */
    uiTextCaution_ColorEscape "\u2bcc",
    uiTextCaution_ColorEscape "\u2bcd",
    uiTextCaution_ColorEscape "\u2bcc",
    uiTextCaution_ColorEscape "\u2bcd",
    uiTextCaution_ColorEscape "\u2bcc",
    uiTextCaution_ColorEscape "\u2bcd",
    uiTextCaution_ColorEscape "\u2bce",
    uiTextCaution_ColorEscape "\u2bcf",
    uiTextCaution_ColorEscape "\u2bce",
    uiTextCaution_ColorEscape "\u2bcf",
    uiTextCaution_ColorEscape "\u2bce",
    uiTextCaution_ColorEscape "\u2bcf",
#endif
#if 0
    /* Pulsing circle */
    uiTextCaution_ColorEscape "\U0001f785",
    uiTextCaution_ColorEscape "\U0001f786",
    uiTextCaution_ColorEscape "\U0001f787",
    uiTextCaution_ColorEscape "\U0001f788",
    uiTextCaution_ColorEscape "\U0001f789",
    uiTextCaution_ColorEscape "\U0001f789",
    uiTextCaution_ColorEscape "\U0001f788",
    uiTextCaution_ColorEscape "\U0001f787",
    uiTextCaution_ColorEscape "\U0001f786",
#endif
#if 0
    /* Dancing dots */
    uiTextCaution_ColorEscape "\U0001fb00",
    uiTextCaution_ColorEscape "\U0001fb01",
    uiTextCaution_ColorEscape "\U0001fb07",
    uiTextCaution_ColorEscape "\U0001fb1e",
    uiTextCaution_ColorEscape "\U0001fb0f",
    uiTextCaution_ColorEscape "\U0001fb03",
    uiTextCaution_ColorEscape "\U0001fb00",
    uiTextCaution_ColorEscape "\U0001fb01",
    uiTextCaution_ColorEscape "\U0001fb07",
    uiTextCaution_ColorEscape "\U0001fb1e",
    uiTextCaution_ColorEscape "\U0001fb0f",
    uiTextCaution_ColorEscape "\U0001fb03",

    uiTextCaution_ColorEscape "\U0001fb7d",
    uiTextCaution_ColorEscape "\U0001fb7e",
    uiTextCaution_ColorEscape "\U0001fb7f",
    uiTextCaution_ColorEscape "\U0001fb7c",
    uiTextCaution_ColorEscape "\U0001fb7d",
    uiTextCaution_ColorEscape "\U0001fb7e",
    uiTextCaution_ColorEscape "\U0001fb7f",
    uiTextCaution_ColorEscape "\U0001fb7c",

    uiTextCaution_ColorEscape "\U0001fb00",
    uiTextCaution_ColorEscape "\U0001fb01",
    uiTextCaution_ColorEscape "\U0001fb07",
    uiTextCaution_ColorEscape "\U0001fb03",
    uiTextCaution_ColorEscape "\U0001fb0f",
    uiTextCaution_ColorEscape "\U0001fb1e",
    uiTextCaution_ColorEscape "\U0001fb07",
    uiTextCaution_ColorEscape "\U0001fb03",
#endif
};

static void updateNavBarIdentity_(iWidget *navBar) {
    const iGmIdentity *ident =
        identityForUrl_GmCerts(certs_App(), url_DocumentWidget(document_App()));
    iWidget *button = findChild_Widget(navBar, "navbar.ident");
    setFlags_Widget(button, selected_WidgetFlag, ident != NULL);
    /* Update menu. */
    iLabelWidget *idItem = child_Widget(findChild_Widget(button, "menu"), 0);
    setTextCStr_LabelWidget(
        idItem,
        ident ? format_CStr(uiTextAction_ColorEscape "%s",
                            cstrCollect_String(subject_TlsCertificate(ident->cert)))
              : "No Active Identity");
    setFlags_Widget(as_Widget(idItem), disabled_WidgetFlag, !ident);
}

static const int loadAnimIntervalMs_ = 133;
static int       loadAnimIndex_      = 0;

static const char *loadAnimationCStr_(void) {
    return stopSeqCStr_[loadAnimIndex_ % iElemCount(stopSeqCStr_)];
}

static uint32_t updateReloadAnimation_Window_(uint32_t interval, void *window) {
    iUnused(window);
    loadAnimIndex_++;
    postCommand_App("window.reload.update");
    return interval;
}

static void setReloadLabel_Window_(iWindow *d, iBool animating) {
    updateTextCStr_LabelWidget(findChild_Widget(d->root, "reload"),
                               animating ? loadAnimationCStr_() : reloadCStr_);
}

static void checkLoadAnimation_Window_(iWindow *d) {
    const iBool isOngoing = isRequestOngoing_DocumentWidget(document_App());
    if (isOngoing && !d->loadAnimTimer) {
        d->loadAnimTimer = SDL_AddTimer(loadAnimIntervalMs_, updateReloadAnimation_Window_, d);
    }
    else if (!isOngoing && d->loadAnimTimer) {
        SDL_RemoveTimer(d->loadAnimTimer);
        d->loadAnimTimer = 0;
    }
    setReloadLabel_Window_(d, isOngoing);
}

static iBool handleNavBarCommands_(iWidget *navBar, const char *cmd) {
    if (equal_Command(cmd, "window.resized")) {
        const iBool isNarrow = width_Rect(bounds_Widget(navBar)) / gap_UI < 140;
        if (isNarrow ^ ((flags_Widget(navBar) & tight_WidgetFlag) != 0)) {
            setFlags_Widget(navBar, tight_WidgetFlag, isNarrow);
            iForEach(ObjectList, i, navBar->children) {
                iWidget *child = as_Widget(i.object);
                setFlags_Widget(
                    child, tight_WidgetFlag, isNarrow || !cmp_String(id_Widget(child), "lock"));
                if (isInstance_Object(i.object, &Class_LabelWidget)) {
                    iLabelWidget *label = i.object;
                    updateSize_LabelWidget(label);
                }
            }
        }
        arrange_Widget(navBar);
        refresh_Widget(navBar);
        postCommand_Widget(navBar, "layout.changed id:navbar");
        return iFalse;
    }
    else if (equal_Command(cmd, "window.reload.update")) {
        checkLoadAnimation_Window_(get_Window());
        return iTrue;
    }
    else if (equal_Command(cmd, "navigate.focus")) {
        iWidget *url = findChild_Widget(navBar, "url");
        if (focus_Widget() != url) {
            setFocus_Widget(findChild_Widget(navBar, "url"));
        }
        else {
            selectAll_InputWidget((iInputWidget *) url);
        }
        return iTrue;
    }
    else if (equal_Command(cmd, "input.edited")) {
        iAnyObject *url = findChild_Widget(navBar, "url");
        if (pointer_Command(cmd) == url) {
            submit_LookupWidget(findWidget_App("lookup"), text_InputWidget(url));
            return iTrue;
        }
    }
    else if (startsWith_CStr(cmd, "input.ended id:url ")) {
        iInputWidget *url = findChild_Widget(navBar, "url");
        if (isEmpty_String(text_InputWidget(url))) {
            /* User entered nothing; restore the current URL. */
            setText_InputWidget(url, url_DocumentWidget(document_App()));
            return iTrue;
        }
        if (arg_Command(cmd) && argLabel_Command(cmd, "enter") &&
            !isFocused_Widget(findWidget_App("lookup"))) {
            iString *newUrl = copy_String(text_InputWidget(url));
            trim_String(newUrl);
            postCommandf_App(
                "open url:%s",
                cstr_String(absoluteUrl_String(&iStringLiteral(""), collect_String(newUrl))));
            return iTrue;
        }
    }
    else if (startsWith_CStr(cmd, "document.")) {
        /* React to the current document only. */
        if (document_Command(cmd) == document_App()) {
            if (equal_Command(cmd, "document.changed")) {
                iInputWidget *url = findWidget_App("url");
                const iString *urlStr = collect_String(suffix_Command(cmd, "url"));
                visitUrl_Visited(visited_App(), urlStr, 0);
                postCommand_App("visited.changed"); /* sidebar will update */
                setText_InputWidget(url, urlStr);
                checkLoadAnimation_Window_(get_Window());
                updateNavBarIdentity_(navBar);
                return iFalse;
            }
            else if (equal_Command(cmd, "document.request.cancelled")) {
                checkLoadAnimation_Window_(get_Window());
                return iFalse;
            }
            else if (equal_Command(cmd, "document.request.started")) {
                iInputWidget *url = findChild_Widget(navBar, "url");
                setTextCStr_InputWidget(url, suffixPtr_Command(cmd, "url"));
                checkLoadAnimation_Window_(get_Window());
                return iFalse;
            }
        }
    }
    else if (equal_Command(cmd, "tabs.changed")) {
        /* Update navbar according to the current tab. */
        iDocumentWidget *doc = document_App();
        if (doc) {
            setText_InputWidget(findChild_Widget(navBar, "url"), url_DocumentWidget(doc));
            checkLoadAnimation_Window_(get_Window());
            updateNavBarIdentity_(navBar);
        }
        setFocus_Widget(NULL);
    }
    else if (equal_Command(cmd, "mouse.clicked") && arg_Command(cmd)) {
        iWidget *widget = pointer_Command(cmd);
        iWidget *menu = findWidget_App("doctabs.menu");
        if (isTabButton_Widget(widget) && !isVisible_Widget(menu)) {
            iWidget *tabs = findWidget_App("doctabs");
            showTabPage_Widget(tabs,
                               tabPage_Widget(tabs, childIndex_Widget(widget->parent, widget)));
            openMenu_Widget(menu, coord_Command(cmd));
        }
    }
    else if (equal_Command(cmd, "navigate.reload")) {
        iDocumentWidget *doc = document_Command(cmd);
        if (isRequestOngoing_DocumentWidget(doc)) {
            postCommand_App("document.stop");
        }
        else {
            postCommand_App("document.reload");
        }
        return iTrue;
    }
    return iFalse;
}

static iBool handleSearchBarCommands_(iWidget *searchBar, const char *cmd) {
    if (equal_Command(cmd, "input.ended") &&
        equal_Rangecc(range_Command(cmd, "id"), "find.input")) {
        iInputWidget *input = findChild_Widget(searchBar, "find.input");
        if (arg_Command(cmd) && argLabel_Command(cmd, "enter") && isVisible_Widget(input)) {
            postCommand_App("find.next");
            /* Keep focus when pressing Enter. */
            if (!isEmpty_String(text_InputWidget(input))) {
                postCommand_App("focus.set id:find.input");
            }
        }
        else {
            postCommand_App("find.clearmark");
        }
        return iTrue;
    }
    else if (equal_Command(cmd, "focus.gained")) {
        if (pointer_Command(cmd) == findChild_Widget(searchBar, "find.input")) {
            if (!isVisible_Widget(searchBar)) {
                setFlags_Widget(searchBar, hidden_WidgetFlag | disabled_WidgetFlag, iFalse);
                arrange_Widget(get_Window()->root);
                postRefresh_App();
            }
        }
    }
    else if (equal_Command(cmd, "find.close")) {
        if (isVisible_Widget(searchBar)) {
            setFlags_Widget(searchBar, hidden_WidgetFlag | disabled_WidgetFlag, iTrue);
            arrange_Widget(searchBar->parent);
            if (isFocused_Widget(findChild_Widget(searchBar, "find.input"))) {
                setFocus_Widget(NULL);
            }
            refresh_Widget(searchBar->parent);
        }
        return iTrue;
    }
    return iFalse;
}

static void setupUserInterface_Window(iWindow *d) {
    /* Children of root cover the entire window. */
    setFlags_Widget(d->root, resizeChildren_WidgetFlag, iTrue);
    setCommandHandler_Widget(d->root, handleRootCommands_);

    iWidget *div = makeVDiv_Widget();
    setId_Widget(div, "navdiv");
    addChild_Widget(d->root, iClob(div));

    /* Navigation bar. */ {
        iWidget *navBar = new_Widget();
        setId_Widget(navBar, "navbar");
        /*setPadding_Widget(navBar, gap_UI / 2, 0, gap_UI / 2, 0);*/
        setPadding_Widget(navBar, gap_UI, gap_UI / 2, gap_UI, gap_UI / 2);
        setFlags_Widget(navBar,
                        arrangeHeight_WidgetFlag | resizeChildren_WidgetFlag |
                            arrangeHorizontal_WidgetFlag,
                        iTrue);
        addChild_Widget(div, iClob(navBar));
        setBackgroundColor_Widget(navBar, uiBackground_ColorId);
        setCommandHandler_Widget(navBar, handleNavBarCommands_);
        addChild_Widget(navBar, iClob(newIcon_LabelWidget("\U0001f870", 0, 0, "navigate.back")));
        addChild_Widget(navBar, iClob(newIcon_LabelWidget("\U0001f872", 0, 0, "navigate.forward")));
        iLabelWidget *idMenu = makeMenuButton_LabelWidget(
            "\U0001f464", identityButtonMenuItems_, iElemCount(identityButtonMenuItems_));
        setAlignVisually_LabelWidget(idMenu, iTrue);
        addChild_Widget(navBar, iClob(idMenu));
        setId_Widget(as_Widget(idMenu), "navbar.ident");
        iLabelWidget *lock =
            addChildFlags_Widget(navBar,
                                 iClob(newIcon_LabelWidget("\U0001f513", 0, 0, "server.showcert")),
                                 frameless_WidgetFlag | tight_WidgetFlag);
        setId_Widget(as_Widget(lock), "navbar.lock");
        setFont_LabelWidget(lock, defaultSymbols_FontId);
        updateTextCStr_LabelWidget(lock, "\U0001f512");
        /* URL input field. */ {
            iInputWidget *url = new_InputWidget(0);
            setSelectAllOnFocus_InputWidget(url, iTrue);
            setId_Widget(as_Widget(url), "url");
            setUrlContent_InputWidget(url, iTrue);
            setNotifyEdits_InputWidget(url, iTrue);
            setTextCStr_InputWidget(url, "gemini://");
            addChildFlags_Widget(navBar, iClob(url), expand_WidgetFlag);
            setPadding_Widget(as_Widget(url),0, 0, gap_UI * 1, 0);
            /* Feeds refresh indicator is inside the input field. */ {
                iLabelWidget *fprog = new_LabelWidget(uiTextCaution_ColorEscape
                                                      "\u2605 Refreshing Feeds...", NULL);
                setId_Widget(as_Widget(fprog), "feeds.progress");
                setBackgroundColor_Widget(as_Widget(fprog), uiBackground_ColorId);
                setAlignVisually_LabelWidget(fprog, iTrue);
                shrink_Rect(&as_Widget(fprog)->rect, init_I2(0, gap_UI));
                addChildFlags_Widget(as_Widget(url),
                                     iClob(fprog),
                                     moveToParentRightEdge_WidgetFlag | hidden_WidgetFlag);
            }
            /* Download progress indicator is also inside the input field, but hidden normally.
               TODO: It shouldn't overlap the feeds indicator... */ {
                iLabelWidget *progress = new_LabelWidget(uiTextCaution_ColorEscape "00.000 MB", NULL);
                setId_Widget(as_Widget(progress), "document.progress");
                setBackgroundColor_Widget(as_Widget(progress), uiBackground_ColorId);
                setAlignVisually_LabelWidget(progress, iTrue);
                shrink_Rect(&as_Widget(progress)->rect, init_I2(0, gap_UI));
                addChildFlags_Widget(as_Widget(url),
                                     iClob(progress),
                                     moveToParentRightEdge_WidgetFlag);
            }
        }
        setId_Widget(addChild_Widget(
                         navBar, iClob(newIcon_LabelWidget(reloadCStr_, 0, 0, "navigate.reload"))),
                     "reload");
        addChild_Widget(navBar,
                        iClob(newIcon_LabelWidget(
                            "\U0001f3e0", SDLK_h, KMOD_PRIMARY | KMOD_SHIFT, "navigate.home")));
#if !defined (iHaveNativeMenus)
        iLabelWidget *navMenu =
            makeMenuButton_LabelWidget("\U0001d362", navMenuItems_, iElemCount(navMenuItems_));
        setAlignVisually_LabelWidget(navMenu, iTrue);
        addChild_Widget(navBar, iClob(navMenu));
#else
        insertMenuItems_MacOS("File", 1, fileMenuItems_, iElemCount(fileMenuItems_));
        insertMenuItems_MacOS("Edit", 2, editMenuItems_, iElemCount(editMenuItems_));
        insertMenuItems_MacOS("View", 3, viewMenuItems_, iElemCount(viewMenuItems_));
        insertMenuItems_MacOS("Bookmarks", 4, bookmarksMenuItems_, iElemCount(bookmarksMenuItems_));
        insertMenuItems_MacOS("Identity", 5, identityMenuItems_, iElemCount(identityMenuItems_));
        insertMenuItems_MacOS("Help", 7, helpMenuItems_, iElemCount(helpMenuItems_));
#endif
    }
    /* Tab bar. */ {
        iWidget *tabBar = makeTabs_Widget(div);
        setId_Widget(tabBar, "doctabs");
        setFlags_Widget(tabBar, expand_WidgetFlag, iTrue);
        setBackgroundColor_Widget(tabBar, uiBackground_ColorId);
        appendTabPage_Widget(tabBar, iClob(new_DocumentWidget()), "Document", 0, 0);
        iWidget *buttons = findChild_Widget(tabBar, "tabs.buttons");
        setFlags_Widget(buttons, collapse_WidgetFlag | hidden_WidgetFlag, iTrue);
        setId_Widget(
            addChild_Widget(buttons, iClob(newIcon_LabelWidget("\u2795", 0, 0, "tabs.new"))),
            "newtab");
    }
    /* Side bars. */ {
        iWidget *content = findChild_Widget(d->root, "tabs.content");
        iSidebarWidget *sidebar1 = new_SidebarWidget(left_SideBarSide);
        addChildPos_Widget(content, iClob(sidebar1), front_WidgetAddPos);
        iSidebarWidget *sidebar2 = new_SidebarWidget(right_SideBarSide);
        addChildPos_Widget(content, iClob(sidebar2), back_WidgetAddPos);
    }
    /* Lookup results. */ {
        iLookupWidget *lookup = new_LookupWidget();
        addChildFlags_Widget(div, iClob(lookup), fixedPosition_WidgetFlag | hidden_WidgetFlag);
    }
    /* Search bar. */ {
        iWidget *searchBar = new_Widget();
        setId_Widget(searchBar, "search");
        setFlags_Widget(searchBar,
                        hidden_WidgetFlag | disabled_WidgetFlag | collapse_WidgetFlag |
                            arrangeHeight_WidgetFlag | resizeChildren_WidgetFlag |
                            arrangeHorizontal_WidgetFlag,
                        iTrue);
        addChild_Widget(div, iClob(searchBar));
        setBackgroundColor_Widget(searchBar, uiBackground_ColorId);
        setCommandHandler_Widget(searchBar, handleSearchBarCommands_);
        addChildFlags_Widget(
            searchBar, iClob(new_LabelWidget("\U0001f50d Text", NULL)), frameless_WidgetFlag);
        iInputWidget *input = new_InputWidget(0);
        setSelectAllOnFocus_InputWidget(input, iTrue);
        setEatEscape_InputWidget(input, iFalse); /* unfocus and close with one keypress */
        setId_Widget(addChildFlags_Widget(searchBar, iClob(input), expand_WidgetFlag),
                     "find.input");
        addChild_Widget(searchBar, iClob(newIcon_LabelWidget("  \u2b9f  ", 'g', KMOD_PRIMARY, "find.next")));
        addChild_Widget(searchBar, iClob(newIcon_LabelWidget("  \u2b9d  ", 'g', KMOD_PRIMARY | KMOD_SHIFT, "find.prev")));
        addChild_Widget(searchBar, iClob(newIcon_LabelWidget("\u2a2f", SDLK_ESCAPE, 0, "find.close")));
    }
    iWidget *tabsMenu = makeMenu_Widget(d->root,
                                        (iMenuItem[]){
                                            { "Close Tab", 0, 0, "tabs.close" },
                                            { "Duplicate Tab", 0, 0, "tabs.new duplicate:1" },
                                            { "---", 0, 0, NULL },
                                            { "Close Other Tabs", 0, 0, "tabs.close toleft:1 toright:1" },
                                            { "Close Tabs To Left", 0, 0, "tabs.close toleft:1" },
                                            { "Close Tabs To Right", 0, 0, "tabs.close toright:1" },
                                        },
                                        6);
    setId_Widget(tabsMenu, "doctabs.menu");
    /* Global keyboard shortcuts. */ {
        addAction_Widget(d->root, 'l', KMOD_PRIMARY, "navigate.focus");
        addAction_Widget(d->root, 'f', KMOD_PRIMARY, "focus.set id:find.input");
        addAction_Widget(d->root, '1', KMOD_PRIMARY, "sidebar.mode arg:0 toggle:1");
        addAction_Widget(d->root, '2', KMOD_PRIMARY, "sidebar.mode arg:1 toggle:1");
        addAction_Widget(d->root, '3', KMOD_PRIMARY, "sidebar.mode arg:2 toggle:1");
        addAction_Widget(d->root, '4', KMOD_PRIMARY, "sidebar.mode arg:3 toggle:1");
        addAction_Widget(d->root, '5', KMOD_PRIMARY, "sidebar.mode arg:4 toggle:1");
        addAction_Widget(d->root, '1', rightSidebar_KeyModifier, "sidebar2.mode arg:0 toggle:1");
        addAction_Widget(d->root, '2', rightSidebar_KeyModifier, "sidebar2.mode arg:1 toggle:1");
        addAction_Widget(d->root, '3', rightSidebar_KeyModifier, "sidebar2.mode arg:2 toggle:1");
        addAction_Widget(d->root, '4', rightSidebar_KeyModifier, "sidebar2.mode arg:3 toggle:1");
        addAction_Widget(d->root, '5', rightSidebar_KeyModifier, "sidebar2.mode arg:4 toggle:1");
    }
}

static void updateRootSize_Window_(iWindow *d, iBool notifyAlways) {
    iInt2 *size = &d->root->rect.size;
    const iInt2 oldSize = *size;
    SDL_GetRendererOutputSize(d->render, &size->x, &size->y);
    if (notifyAlways || !isEqual_I2(oldSize, *size)) {
        arrange_Widget(d->root);
        postCommandf_App("window.resized width:%d height:%d", size->x, size->y);
        postRefresh_App();
    }
}

void drawWhileResizing_Window(iWindow *d, int w, int h) {
    /* This is called while a window resize is in progress, so we can be pretty confident
       the size has actually changed. */
    d->root->rect.size = coord_Window(d, w, h);
    arrange_Widget(d->root);
    draw_Window(d);
}

static float pixelRatio_Window_(const iWindow *d) {
#if defined (iPlatformMsys)
    iUnused(d);
    return desktopDPI_Win32();
#else
    int dx, x;
    SDL_GetRendererOutputSize(d->render, &dx, NULL);
    SDL_GetWindowSize(d->win, &x, NULL);
    return (float) dx / (float) x;
#endif
}

static void drawBlank_Window_(iWindow *d) {
    const iColor bg = get_Color(uiBackground_ColorId);
    SDL_SetRenderDrawColor(d->render, bg.r, bg.g, bg.b, 255);
    SDL_RenderClear(d->render);
    SDL_RenderPresent(d->render);
}

iBool create_Window_(iWindow *d, iRect rect, uint32_t flags) {
    flags |= SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI | SDL_WINDOW_HIDDEN;
    if (SDL_CreateWindowAndRenderer(
            width_Rect(rect), height_Rect(rect), flags, &d->win, &d->render)) {
        return iFalse;
    }
    return iTrue;
}

void init_Window(iWindow *d, iRect rect) {
    theWindow_ = d;
    iZap(d->cursors);
    d->initialPos = rect.pos;
    d->lastRect = rect;
    d->pendingCursor = NULL;
    d->isDrawFrozen = iTrue;
    d->isMouseInside = iTrue;
    d->focusGainedAt = 0;
    uint32_t flags = 0;
#if defined (iPlatformApple)
    SDL_SetHint(SDL_HINT_RENDER_DRIVER, shouldDefaultToMetalRenderer_MacOS() ? "metal" : "opengl");
#else
    flags |= SDL_WINDOW_OPENGL;
#endif
    SDL_SetHint(SDL_HINT_RENDER_VSYNC, "1");
    /* First try SDL's default renderer that should be the best option. */
    if (forceSoftwareRender_App() || !create_Window_(d, rect, flags)) {
        /* No luck, maybe software only? This should always work as long as there is a display. */
        SDL_SetHint(SDL_HINT_RENDER_DRIVER, "software");
        if (!create_Window_(d, rect, 0)) {
            fprintf(stderr, "Error when creating window: %s\n", SDL_GetError());
            exit(-2);
        }
    }
    if (left_Rect(rect) >= 0 || top_Rect(rect) >= 0) {
        SDL_SetWindowPosition(d->win, left_Rect(rect), top_Rect(rect));
    }
    const iInt2 minSize = init_I2(425, 300);
    SDL_SetWindowMinimumSize(d->win, minSize.x, minSize.y);
    SDL_SetWindowTitle(d->win, "Lagrange");
    /* Some info. */ {
        SDL_RendererInfo info;
        SDL_GetRendererInfo(d->render, &info);
        printf("[window] renderer: %s%s\n", info.name,
               info.flags & SDL_RENDERER_ACCELERATED ? " (accelerated)" : "");
#if !defined (NDEBUG)
        printf("[window] max texture size: %d x %d\n",
               info.max_texture_width,
               info.max_texture_height);
        for (size_t i = 0; i < info.num_texture_formats; ++i) {
            printf("[window] supported texture format: %s\n", SDL_GetPixelFormatName(
                       info.texture_formats[i]));
        }
#endif
    }
    drawBlank_Window_(d);
    d->uiScale = initialUiScale_;
    d->pixelRatio = pixelRatio_Window_(d);
    setPixelRatio_Metrics(d->pixelRatio * d->uiScale);
#if defined (iPlatformMsys)
    SDL_SetWindowMinimumSize(d->win, minSize.x * d->pixelRatio, minSize.y * d->pixelRatio);
    useExecutableIconResource_SDLWindow(d->win);
#endif
#if defined (iPlatformLinux)
    /* Load the window icon. */ {
        int w, h, num;
        const iBlock *icon = &imageLagrange64_Embedded;
        stbi_uc *pixels = stbi_load_from_memory(constData_Block(icon),
                                                size_Block(icon),
                                                &w,
                                                &h,
                                                &num,
                                                STBI_rgb_alpha);
        SDL_Surface *surf =
            SDL_CreateRGBSurfaceWithFormatFrom(pixels, w, h, 32, 4 * w, SDL_PIXELFORMAT_RGBA32);
        SDL_SetWindowIcon(d->win, surf);
        SDL_FreeSurface(surf);
        stbi_image_free(pixels);
    }
#endif
    d->root = new_Widget();
    d->presentTime = 0.0;
    d->frameTime = SDL_GetTicks();
    d->loadAnimTimer = 0;
    setId_Widget(d->root, "root");
    init_Text(d->render);
    setupUserInterface_Window(d);
    postCommand_App("bindings.changed"); /* update from bindings */
    updateRootSize_Window_(d, iFalse);
}

void deinit_Window(iWindow *d) {
    iRecycle();
    if (theWindow_ == d) {
        theWindow_ = NULL;
    }
    iForIndices(i, d->cursors) {
        if (d->cursors[i]) {
            SDL_FreeCursor(d->cursors[i]);
        }
    }
    iReleasePtr(&d->root);
    deinit_Text();
    SDL_DestroyRenderer(d->render);
    SDL_DestroyWindow(d->win);
}

SDL_Renderer *renderer_Window(const iWindow *d) {
    return d->render;
}

static iBool isMaximized_Window_(const iWindow *d) {
#if !defined (iPlatformApple)
    return (SDL_GetWindowFlags(d->win) & (SDL_WINDOW_MINIMIZED | SDL_WINDOW_MAXIMIZED)) != 0;
#else
    iUnused(d);
    return iFalse; /* There is fullscreen mode but that is not handled at the moment. */
#endif
}

static iBool handleWindowEvent_Window_(iWindow *d, const SDL_WindowEvent *ev) {
    switch (ev->event) {
        case SDL_WINDOWEVENT_EXPOSED:
            /* Since we are manually controlling when to redraw the window, we are responsible
               for ensuring that window contents get redrawn after expose events. Under certain
               circumstances (e.g., under openbox), not doing this would mean that the window
               is missing contents until other events trigger a refresh. */
            postRefresh_App();
#if defined (LAGRANGE_ENABLE_WINDOWPOS_FIX)
            if (d->initialPos.x >= 0) {
                int bx, by;
                SDL_GetWindowBordersSize(d->win, &by, &bx, NULL, NULL);
                SDL_SetWindowPosition(d->win, d->initialPos.x + bx, d->initialPos.y + by);
                d->initialPos = init1_I2(-1);
            }
#endif
            return iFalse;
        case SDL_WINDOWEVENT_MOVED: {
            if (!isMaximized_Window_(d) && !d->isDrawFrozen) {
                d->lastRect.pos = init_I2(ev->data1, ev->data2);
                iInt2 border = zero_I2();
#if !defined (iPlatformApple)
                SDL_GetWindowBordersSize(d->win, &border.y, &border.x, NULL, NULL);
#endif
                d->lastRect.pos = max_I2(zero_I2(), sub_I2(d->lastRect.pos, border));
            }
            return iTrue;
        }
        case SDL_WINDOWEVENT_RESIZED:
            if (!isMaximized_Window_(d) && !d->isDrawFrozen) {
                d->lastRect.size = init_I2(ev->data1, ev->data2);
            }
            updateRootSize_Window_(d, iTrue /* we were already redrawing during the resize */);
            return iTrue;
        case SDL_WINDOWEVENT_LEAVE:
            unhover_Widget();
            d->isMouseInside = iFalse;
            postCommand_App("window.mouse.exited");
            return iTrue;
        case SDL_WINDOWEVENT_ENTER:
            d->isMouseInside = iTrue;
            postCommand_App("window.mouse.entered");
            return iTrue;
        case SDL_WINDOWEVENT_TAKE_FOCUS:
            SDL_SetWindowInputFocus(d->win);
            return iTrue;
        case SDL_WINDOWEVENT_FOCUS_GAINED:
            d->focusGainedAt = SDL_GetTicks();
            postCommand_App("window.focus.gained");
            return iFalse;
        case SDL_WINDOWEVENT_FOCUS_LOST:
            postCommand_App("window.focus.lost");
            return iFalse;
        default:
            break;
    }
    return iFalse;
}

static void applyCursor_Window_(iWindow *d) {
    if (d->pendingCursor) {
        SDL_SetCursor(d->pendingCursor);
        d->pendingCursor = NULL;
    }
}

iBool processEvent_Window(iWindow *d, const SDL_Event *ev) {
    switch (ev->type) {
        case SDL_WINDOWEVENT: {
            return handleWindowEvent_Window_(d, &ev->window);
        }
        case SDL_RENDER_TARGETS_RESET:
        case SDL_RENDER_DEVICE_RESET: {
            resetFonts_Text();
            postCommand_App("theme.changed"); /* forces UI invalidation */
            break;
        }
        default: {
            SDL_Event event = *ev;
            if (event.type == SDL_USEREVENT && isCommand_UserEvent(ev, "window.unfreeze")) {
                d->isDrawFrozen = iFalse;
                /* When the window is shown for the first time, ensure glyphs get
                   re-cached correctly. */
                if (SDL_GetWindowFlags(d->win) & SDL_WINDOW_HIDDEN) {
                    SDL_ShowWindow(d->win);
                    resetFonts_Text();
                    postCommand_App("theme.changed");
                }
                postRefresh_App();
                return iTrue;
            }
            if (event.type == SDL_KEYDOWN && SDL_GetTicks() - d->focusGainedAt < 10) {
                /* Suspiciously close to when input focus was received. For example under openbox,
                   closing xterm with Ctrl+D will cause the keydown event to "spill" over to us.
                   As a workaround, ignore these events. */
                return iTrue; /* won't go to bindings, either */
            }
            /* Map mouse pointer coordinate to our coordinate system. */
            if (event.type == SDL_MOUSEMOTION) {
                setCursor_Window(d, SDL_SYSTEM_CURSOR_ARROW); /* default cursor */
                const iInt2 pos = coord_Window(d, event.motion.x, event.motion.y);
                event.motion.x = pos.x;
                event.motion.y = pos.y;
            }
            else if (event.type == SDL_MOUSEBUTTONUP || event.type == SDL_MOUSEBUTTONDOWN) {
                const iInt2 pos = coord_Window(d, event.button.x, event.button.y);
                event.button.x = pos.x;
                event.button.y = pos.y;
            }
            iWidget *widget = d->root;
            if (event.type == SDL_MOUSEMOTION || event.type == SDL_MOUSEWHEEL ||
                event.type == SDL_MOUSEBUTTONUP || event.type == SDL_MOUSEBUTTONDOWN) {
                if (mouseGrab_Widget()) {
                    widget = mouseGrab_Widget();
                }
            }
            iWidget *oldHover = hover_Widget();
            /* Dispatch the event to the tree of widgets. */
            iBool wasUsed = dispatchEvent_Widget(widget, &event);
            if (!wasUsed) {
                /* As a special case, clicking the middle mouse button can be used for pasting
                   from the clipboard. */
                if (event.type == SDL_MOUSEBUTTONDOWN && event.button.button == SDL_BUTTON_MIDDLE) {
                    SDL_Event paste;
                    iZap(paste);
                    paste.type           = SDL_KEYDOWN;
                    paste.key.keysym.sym = SDLK_v;
                    paste.key.keysym.mod = KMOD_PRIMARY;
                    paste.key.state      = SDL_PRESSED;
                    paste.key.timestamp  = SDL_GetTicks();
                    wasUsed = dispatchEvent_Widget(widget, &paste);
                }
            }
            if (oldHover != hover_Widget()) {
                postRefresh_App();
            }
            if (event.type == SDL_MOUSEMOTION) {
                applyCursor_Window_(d);
            }
            return wasUsed;
        }
    }
    return iFalse;
}

void draw_Window(iWindow *d) {
    if (d->isDrawFrozen) {
        return;
    }
//#if !defined (NDEBUG)
//    printf("draw %d\n", d->frameTime); fflush(stdout);
//#endif
    /* Clear the window. */
    SDL_SetRenderDrawColor(d->render, 0, 0, 0, 255);
    SDL_RenderClear(d->render);
    /* Draw widgets. */
    d->frameTime = SDL_GetTicks();
    draw_Widget(d->root);
#if 0
    /* Text cache debugging. */ {
        SDL_Texture *cache = glyphCache_Text();
        SDL_Rect rect = { d->root->rect.size.x - 640, 0, 640, 5 * 640 };
        SDL_SetRenderDrawColor(d->render, 0, 0, 0, 255);
        SDL_RenderFillRect(d->render, &rect);
        SDL_RenderCopy(d->render, glyphCache_Text(), NULL, &rect);
    }
#endif
    SDL_RenderPresent(d->render);
}

void resize_Window(iWindow *d, int w, int h) {
    SDL_SetWindowSize(d->win, w, h);
    updateRootSize_Window_(d, iFalse);
}

void setTitle_Window(iWindow *d, const iString *title) {
    SDL_SetWindowTitle(d->win, cstr_String(title));
}

void setUiScale_Window(iWindow *d, float uiScale) {
    uiScale = iClamp(uiScale, 0.5f, 4.0f);
    if (d) {
        d->uiScale = uiScale;
#if 0
        deinit_Text();
        setPixelRatio_Metrics(d->pixelRatio * d->uiScale);
        init_Text(d->render);
        postCommand_App("metrics.changed");
        /* TODO: Dynamic UI metrics change. Widgets need to update themselves. */
#endif
    }
    else {
        initialUiScale_ = uiScale;
    }
}

void setFreezeDraw_Window(iWindow *d, iBool freezeDraw) {
    d->isDrawFrozen = freezeDraw;
}

void setCursor_Window(iWindow *d, int cursor) {
    if (!d->cursors[cursor]) {
        d->cursors[cursor] = SDL_CreateSystemCursor(cursor);
    }
    d->pendingCursor = d->cursors[cursor];
}

iInt2 rootSize_Window(const iWindow *d) {
    return d->root->rect.size;
}

iInt2 coord_Window(const iWindow *d, int x, int y) {
#if defined (iPlatformMsys)
    /* On Windows, surface coordinates are in pixels. */
    return init_I2(x, y);
#else
    /* Coordinates are in points. */
    return mulf_I2(init_I2(x, y), d->pixelRatio);
#endif
}

iInt2 mouseCoord_Window(const iWindow *d) {
    if (!d->isMouseInside) {
        return init_I2(-1000000, -1000000);
    }
    int x, y;
    SDL_GetMouseState(&x, &y);
    return coord_Window(d, x, y);
}

float uiScale_Window(const iWindow *d) {
    return d->uiScale;
}

uint32_t frameTime_Window(const iWindow *d) {
    return d->frameTime;
}

iWindow *get_Window(void) {
    return theWindow_;
}