IntSize ScrollbarThemeAura::buttonSize(const ScrollbarThemeClient& scrollbar)
{
if (scrollbar.orientation() == VerticalScrollbar) {
IntSize size = Platform::current()->themeEngine()->getSize(WebThemeEngine::PartScrollbarUpArrow);
return IntSize(size.width(), scrollbar.height() < 2 * size.height() ? scrollbar.height() / 2 : size.height());
}
// HorizontalScrollbar
IntSize size = Platform::current()->themeEngine()->getSize(WebThemeEngine::PartScrollbarLeftArrow);
return IntSize(scrollbar.width() < 2 * size.width() ? scrollbar.width() / 2 : size.width(), size.height());
}
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());
}
void ScrollbarTheme::splitTrack(const ScrollbarThemeClient& scrollbar,
const IntRect& unconstrainedTrackRect,
IntRect& beforeThumbRect,
IntRect& thumbRect,
IntRect& afterThumbRect) {
// This function won't even get called unless we're big enough to have some
// combination of these three rects where at least one of them is non-empty.
IntRect trackRect =
constrainTrackRectToTrackPieces(scrollbar, unconstrainedTrackRect);
int thumbPos = thumbPosition(scrollbar);
if (scrollbar.orientation() == HorizontalScrollbar) {
thumbRect = IntRect(trackRect.x() + thumbPos, trackRect.y(),
thumbLength(scrollbar), scrollbar.height());
beforeThumbRect =
IntRect(trackRect.x(), trackRect.y(), thumbPos + thumbRect.width() / 2,
trackRect.height());
afterThumbRect =
IntRect(trackRect.x() + beforeThumbRect.width(), trackRect.y(),
trackRect.maxX() - beforeThumbRect.maxX(), trackRect.height());
} else {
thumbRect = IntRect(trackRect.x(), trackRect.y() + thumbPos,
scrollbar.width(), thumbLength(scrollbar));
beforeThumbRect = IntRect(trackRect.x(), trackRect.y(), trackRect.width(),
thumbPos + thumbRect.height() / 2);
afterThumbRect =
IntRect(trackRect.x(), trackRect.y() + beforeThumbRect.height(),
trackRect.width(), trackRect.maxY() - beforeThumbRect.maxY());
}
}
IntSize ScrollbarThemeAura::buttonSize(const ScrollbarThemeClient& scrollbar) {
if (!hasScrollbarButtons(scrollbar.orientation()))
return IntSize(0, 0);
if (scrollbar.orientation() == VerticalScrollbar) {
int squareSize = scrollbar.width();
return IntSize(squareSize, scrollbar.height() < 2 * squareSize
? scrollbar.height() / 2
: squareSize);
}
// HorizontalScrollbar
int squareSize = scrollbar.height();
return IntSize(
scrollbar.width() < 2 * squareSize ? scrollbar.width() / 2 : squareSize,
squareSize);
}
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());
}
