ScrollbarThemeAdwaita.cpp [plain text]
#include "config.h"
#include "ScrollbarThemeAdwaita.h"
#include "Color.h"
#include "FloatRoundedRect.h"
#include "GraphicsContext.h"
#include "PlatformMouseEvent.h"
#include "ScrollableArea.h"
#include "Scrollbar.h"
#include "ThemeAdwaita.h"
namespace WebCore {
static const unsigned scrollbarSize = 13;
static const unsigned hoveredScrollbarBorderSize = 1;
static const unsigned thumbBorderSize = 1;
static const unsigned overlayThumbSize = 5;
static const unsigned minimumThumbSize = 40;
static const unsigned thumbSize = 6;
static const double scrollbarOpacity = 0.8;
static constexpr auto scrollbarBackgroundColor = SRGBA<uint8_t> { 252, 252, 252 };
static constexpr auto scrollbarBorderColor = SRGBA<uint8_t> { 220, 223, 227 };
static constexpr auto overlayThumbBorderColor = Color::white.colorWithAlphaByte(100);
static constexpr auto overlayThumbColor = SRGBA<uint8_t> { 46, 52, 54, 100 };
static constexpr auto thumbHoveredColor = SRGBA<uint8_t> { 86, 91, 92 };
static constexpr auto thumbPressedColor = SRGBA<uint8_t> { 27, 106, 203 };
static constexpr auto thumbColor = SRGBA<uint8_t> { 126, 129, 130 };
bool ScrollbarThemeAdwaita::usesOverlayScrollbars() const
{
#if PLATFORM(GTK)
static bool shouldUuseOverlayScrollbars = g_strcmp0(g_getenv("GTK_OVERLAY_SCROLLING"), "0");
return shouldUuseOverlayScrollbars;
#else
return true;
#endif
}
int ScrollbarThemeAdwaita::scrollbarThickness(ScrollbarControlSize, ScrollbarExpansionState)
{
return scrollbarSize;
}
int ScrollbarThemeAdwaita::minimumThumbLength(Scrollbar&)
{
return minimumThumbSize;
}
bool ScrollbarThemeAdwaita::hasButtons(Scrollbar&)
{
return false;
}
bool ScrollbarThemeAdwaita::hasThumb(Scrollbar& scrollbar)
{
return thumbLength(scrollbar) > 0;
}
IntRect ScrollbarThemeAdwaita::backButtonRect(Scrollbar&, ScrollbarPart, bool)
{
return { };
}
IntRect ScrollbarThemeAdwaita::forwardButtonRect(Scrollbar&, ScrollbarPart, bool)
{
return { };
}
IntRect ScrollbarThemeAdwaita::trackRect(Scrollbar& scrollbar, bool)
{
return scrollbar.frameRect();
}
bool ScrollbarThemeAdwaita::paint(Scrollbar& scrollbar, GraphicsContext& graphicsContext, const IntRect& damageRect)
{
if (graphicsContext.paintingDisabled())
return false;
if (!scrollbar.enabled())
return true;
IntRect rect = scrollbar.frameRect();
if (!rect.intersects(damageRect))
return true;
double opacity;
if (usesOverlayScrollbars())
opacity = scrollbar.hoveredPart() == NoPart ? scrollbar.opacity() : scrollbarOpacity;
else
opacity = 1;
if (!opacity)
return true;
GraphicsContextStateSaver stateSaver(graphicsContext);
if (opacity != 1) {
graphicsContext.clip(damageRect);
graphicsContext.beginTransparencyLayer(opacity);
}
if (scrollbar.hoveredPart() != NoPart || !usesOverlayScrollbars()) {
graphicsContext.fillRect(rect, scrollbarBackgroundColor);
IntRect frame = rect;
if (scrollbar.orientation() == VerticalScrollbar) {
if (scrollbar.scrollableArea().shouldPlaceBlockDirectionScrollbarOnLeft())
frame.move(frame.width() - hoveredScrollbarBorderSize, 0);
frame.setWidth(hoveredScrollbarBorderSize);
} else
frame.setHeight(hoveredScrollbarBorderSize);
graphicsContext.fillRect(frame, scrollbarBorderColor);
}
int thumbPos = thumbPosition(scrollbar);
int thumbLen = thumbLength(scrollbar);
IntRect thumb = rect;
if (scrollbar.hoveredPart() == NoPart && usesOverlayScrollbars()) {
if (scrollbar.orientation() == VerticalScrollbar) {
if (scrollbar.scrollableArea().shouldPlaceBlockDirectionScrollbarOnLeft())
thumb.move(hoveredScrollbarBorderSize, thumbPos + thumbBorderSize);
else
thumb.move(scrollbarSize - (overlayThumbSize + thumbBorderSize) + hoveredScrollbarBorderSize, thumbPos + thumbBorderSize);
thumb.setWidth(overlayThumbSize);
thumb.setHeight(thumbLen - thumbBorderSize * 2);
} else {
thumb.move(thumbPos + thumbBorderSize, scrollbarSize - (overlayThumbSize + thumbBorderSize) + hoveredScrollbarBorderSize);
thumb.setWidth(thumbLen - thumbBorderSize * 2);
thumb.setHeight(overlayThumbSize);
}
} else {
if (scrollbar.orientation() == VerticalScrollbar) {
if (scrollbar.scrollableArea().shouldPlaceBlockDirectionScrollbarOnLeft())
thumb.move(scrollbarSize - (scrollbarSize / 2 + thumbSize / 2) - hoveredScrollbarBorderSize, thumbPos + thumbBorderSize);
else
thumb.move(scrollbarSize - (scrollbarSize / 2 + thumbSize / 2), thumbPos + thumbBorderSize);
thumb.setWidth(thumbSize);
thumb.setHeight(thumbLen - thumbBorderSize * 2);
} else {
thumb.move(thumbPos + thumbBorderSize, scrollbarSize - (scrollbarSize / 2 + thumbSize / 2));
thumb.setWidth(thumbLen - thumbBorderSize * 2);
thumb.setHeight(thumbSize);
}
}
FloatSize corner(4, 4);
Path path;
if (scrollbar.hoveredPart() == NoPart && usesOverlayScrollbars()) {
path.addRoundedRect(thumb, corner);
thumb.inflate(-1);
path.addRoundedRect(thumb, corner);
graphicsContext.setFillRule(WindRule::EvenOdd);
graphicsContext.setFillColor(overlayThumbBorderColor);
graphicsContext.fillPath(path);
path.clear();
}
path.addRoundedRect(thumb, corner);
graphicsContext.setFillRule(WindRule::NonZero);
if (scrollbar.hoveredPart() == NoPart && usesOverlayScrollbars())
graphicsContext.setFillColor(overlayThumbColor);
else if (scrollbar.pressedPart() == ThumbPart)
graphicsContext.setFillColor(static_cast<ThemeAdwaita&>(Theme::singleton()).activeSelectionBackgroundColor());
else if (scrollbar.hoveredPart() == ThumbPart)
graphicsContext.setFillColor(thumbHoveredColor);
else
graphicsContext.setFillColor(thumbColor);
graphicsContext.fillPath(path);
if (opacity != 1)
graphicsContext.endTransparencyLayer();
return true;
}
ScrollbarButtonPressAction ScrollbarThemeAdwaita::handleMousePressEvent(Scrollbar&, const PlatformMouseEvent& event, ScrollbarPart pressedPart)
{
switch (pressedPart) {
case BackTrackPart:
case ForwardTrackPart:
if (event.shiftKey() || event.button() != LeftButton)
return ScrollbarButtonPressAction::CenterOnThumb;
return ScrollbarButtonPressAction::Scroll;
case ThumbPart:
if (event.button() != RightButton)
return ScrollbarButtonPressAction::StartDrag;
break;
case BackButtonStartPart:
case ForwardButtonStartPart:
case BackButtonEndPart:
case ForwardButtonEndPart:
return ScrollbarButtonPressAction::Scroll;
default:
break;
}
return ScrollbarButtonPressAction::None;
}
#if !PLATFORM(GTK) || USE(GTK4)
ScrollbarTheme& ScrollbarTheme::nativeTheme()
{
static ScrollbarThemeAdwaita theme;
return theme;
}
#endif
}