IntRect ScrollbarThemeAura::trackRect(const ScrollbarThemeClient& scrollbar,
bool) {
// The track occupies all space between the two buttons.
IntSize bs = buttonSize(scrollbar);
if (scrollbar.orientation() == HorizontalScrollbar) {
if (scrollbar.width() <= 2 * bs.width())
return IntRect();
return IntRect(scrollbar.x() + bs.width(), scrollbar.y(),
scrollbar.width() - 2 * bs.width(), scrollbar.height());
}
if (scrollbar.height() <= 2 * bs.height())
return IntRect();
return IntRect(scrollbar.x(), scrollbar.y() + bs.height(), scrollbar.width(),
scrollbar.height() - 2 * bs.height());
}
int ScrollbarTheme::trackPosition(const ScrollbarThemeClient& scrollbar) {
IntRect constrainedTrackRect =
constrainTrackRectToTrackPieces(scrollbar, trackRect(scrollbar));
return (scrollbar.orientation() == HorizontalScrollbar)
? constrainedTrackRect.x() - scrollbar.x()
: constrainedTrackRect.y() - scrollbar.y();
}
bool ScrollbarTheme::shouldSnapBackToDragOrigin(
const ScrollbarThemeClient& scrollbar,
const PlatformMouseEvent& evt) {
IntPoint mousePosition = scrollbar.convertFromRootFrame(evt.position());
mousePosition.move(scrollbar.x(), scrollbar.y());
return Platform::current()->scrollbarBehavior()->shouldSnapBackToDragOrigin(
mousePosition, trackRect(scrollbar),
scrollbar.orientation() == HorizontalScrollbar);
}
IntRect ScrollbarThemeAura::forwardButtonRect(
const ScrollbarThemeClient& scrollbar,
ScrollbarPart part,
bool) {
// Windows and Linux just have single arrows.
if (part == ForwardButtonStartPart)
return IntRect();
IntSize size = buttonSize(scrollbar);
int x, y;
if (scrollbar.orientation() == HorizontalScrollbar) {
x = scrollbar.x() + scrollbar.width() - size.width();
y = scrollbar.y();
} else {
x = scrollbar.x();
y = scrollbar.y() + scrollbar.height() - size.height();
}
return IntRect(x, y, size.width(), size.height());
}
IntRect ScrollbarThemeAura::backButtonRect(
const ScrollbarThemeClient& scrollbar,
ScrollbarPart part,
bool) {
// Windows and Linux just have single arrows.
if (part == BackButtonEndPart)
return IntRect();
IntSize size = buttonSize(scrollbar);
return IntRect(scrollbar.x(), scrollbar.y(), size.width(), size.height());
}
ScrollbarPart ScrollbarTheme::hitTest(const ScrollbarThemeClient& scrollbar,
const IntPoint& positionInRootFrame) {
ScrollbarPart result = NoPart;
if (!scrollbar.enabled())
return result;
IntPoint testPosition = scrollbar.convertFromRootFrame(positionInRootFrame);
testPosition.move(scrollbar.x(), scrollbar.y());
if (!scrollbar.frameRect().contains(testPosition))
return NoPart;
result = ScrollbarBGPart;
IntRect track = trackRect(scrollbar);
if (track.contains(testPosition)) {
IntRect beforeThumbRect;
IntRect thumbRect;
IntRect afterThumbRect;
splitTrack(scrollbar, track, beforeThumbRect, thumbRect, afterThumbRect);
if (thumbRect.contains(testPosition))
result = ThumbPart;
else if (beforeThumbRect.contains(testPosition))
result = BackTrackPart;
else if (afterThumbRect.contains(testPosition))
result = ForwardTrackPart;
else
result = TrackBGPart;
} else if (backButtonRect(scrollbar, BackButtonStartPart)
.contains(testPosition)) {
result = BackButtonStartPart;
} else if (backButtonRect(scrollbar, BackButtonEndPart)
.contains(testPosition)) {
result = BackButtonEndPart;
} else if (forwardButtonRect(scrollbar, ForwardButtonStartPart)
.contains(testPosition)) {
result = ForwardButtonStartPart;
} else if (forwardButtonRect(scrollbar, ForwardButtonEndPart)
.contains(testPosition)) {
result = ForwardButtonEndPart;
}
return result;
}
