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#include "scrollwidget.h"
#include "paint.h"
#include "util.h"
iDefineObjectConstruction(ScrollWidget)
struct Impl_ScrollWidget {
iWidget widget;
iRangei range;
int thumb;
int thumbSize;
iClick click;
int startThumb;
};
void init_ScrollWidget(iScrollWidget *d) {
iWidget *w = as_Widget(d);
init_Widget(w);
setId_Widget(w, "scroll");
setFlags_Widget(w,
fixedWidth_WidgetFlag | resizeToParentHeight_WidgetFlag |
moveToParentRightEdge_WidgetFlag,
iTrue);
w->rect.size.x = gap_UI * 3;
init_Click(&d->click, d, SDL_BUTTON_LEFT);
}
void deinit_ScrollWidget(iScrollWidget *d) {
iUnused(d);
}
static int thumbSize_ScrollWidget_(const iScrollWidget *d) {
return iMax(gap_UI * 6, d->thumbSize);
}
static iRect thumbRect_ScrollWidget_(const iScrollWidget *d) {
const iRect bounds = bounds_Widget(constAs_Widget(d));
iRect rect = init_Rect(bounds.pos.x, bounds.pos.y, bounds.size.x, 0);
const int total = size_Range(&d->range);
if (total > 0) {
const int tsize = thumbSize_ScrollWidget_(d);
const int tpos =
iClamp((float) d->thumb / (float) total, 0, 1) * (height_Rect(bounds) - tsize);
rect.pos.y = bounds.pos.y + tpos;
rect.size.y = tsize;
}
return rect;
}
static void checkVisible_ScrollWidget_(iScrollWidget *d) {
setFlags_Widget(as_Widget(d), hidden_WidgetFlag, height_Rect(thumbRect_ScrollWidget_(d)) == 0);
}
void setRange_ScrollWidget(iScrollWidget *d, iRangei range) {
range.end = iMax(range.start, range.end);
d->range = range;
checkVisible_ScrollWidget_(d);
}
void setThumb_ScrollWidget(iScrollWidget *d, int thumb, int thumbSize) {
d->thumb = thumb;
d->thumbSize = thumbSize;
checkVisible_ScrollWidget_(d);
}
static iBool processEvent_ScrollWidget_(iScrollWidget *d, const SDL_Event *ev) {
iWidget *w = as_Widget(d);
switch (processEvent_Click(&d->click, ev)) {
case started_ClickResult:
setFlags_Widget(w, pressed_WidgetFlag, iTrue);
d->startThumb = d->thumb;
refresh_Widget(w);
return iTrue;
case drag_ClickResult: {
const iRect bounds = bounds_Widget(w);
const int offset = delta_Click(&d->click).y;
const int total = size_Range(&d->range);
int dpos = (float) offset / (float) (height_Rect(bounds) - thumbSize_ScrollWidget_(d)) * total;
d->thumb = iClamp(d->startThumb + dpos, d->range.start, d->range.end);
postCommand_Widget(w, "scroll.moved arg:%d", d->thumb);
refresh_Widget(w);
return iTrue;
}
case finished_ClickResult:
case aborted_ClickResult:
if (!isMoved_Click(&d->click)) {
/* Page up/down. */
const iRect tr = thumbRect_ScrollWidget_(d);
const int y = pos_Click(&d->click).y;
int pgDir = 0;
if (y < top_Rect(tr)) {
pgDir = -1;
}
else if (y > bottom_Rect(tr)) {
pgDir = +1;
}
if (pgDir) {
postCommand_Widget(w, "scroll.page arg:%d", pgDir);
}
}
setFlags_Widget(w, pressed_WidgetFlag, iFalse);
refresh_Widget(w);
return iTrue;
default:
break;
}
return processEvent_Widget(w, ev);
}
static void draw_ScrollWidget_(const iScrollWidget *d) {
const iWidget *w = constAs_Widget(d);
const iRect bounds = bounds_Widget(w);
const iBool isPressed = (flags_Widget(w) & pressed_WidgetFlag) != 0;
if (bounds.size.x > 0) {
iPaint p;
init_Paint(&p);
drawRect_Paint(&p, bounds, black_ColorId);
fillRect_Paint(&p, shrunk_Rect(thumbRect_ScrollWidget_(d), init1_I2(gap_UI / 2)),
isPressed ? orange_ColorId : gray25_ColorId);
}
}
iBeginDefineSubclass(ScrollWidget, Widget)
.processEvent = (iAny *) processEvent_ScrollWidget_,
.draw = (iAny *) draw_ScrollWidget_,
iEndDefineSubclass(ScrollWidget)
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