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()); }