Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/ScrollbarsControllerCoordinated.cpp

/*
 * Copyright (C) 2023 Apple Inc. All rights reserved.
 * Copyright (C) 2026 Igalia S.L.
 *
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#include "config.h"
#include "ScrollbarsControllerCoordinated.h"

#if USE(COORDINATED_GRAPHICS_ASYNC_SCROLLBAR)

#include <WebCore/ScrollableArea.h>
#include <WebCore/ScrollbarTheme.h>
#include <WebCore/ScrollbarsControllerInlines.h>
#include <WebCore/ScrollingCoordinator.h>
#include <wtf/TZoneMallocInlines.h>

namespace WebKit {

WTF_MAKE_TZONE_ALLOCATED_IMPL(ScrollbarsControllerCoordinated);

ScrollbarsControllerCoordinated::ScrollbarsControllerCoordinated(WebCore::ScrollableArea& scrollableArea, WebCore::ScrollingCoordinator* coordinator)
    : WebCore::ScrollbarsControllerGeneric(scrollableArea)
    , m_coordinator(ThreadSafeWeakPtr<WebCore::ScrollingCoordinator>(coordinator))
{
    if (auto scrollingCoordinator = m_coordinator.get())
        scrollingCoordinator->setScrollbarWidth(scrollableArea, scrollableArea.scrollbarWidthStyle());
}

void ScrollbarsControllerCoordinated::scrollbarLayoutDirectionChanged(WebCore::UserInterfaceLayoutDirection scrollbarLayoutDirection)
{
    WebCore::ScrollbarsControllerGeneric::scrollbarLayoutDirectionChanged(scrollbarLayoutDirection);

    if (RefPtr scrollingCoordinator = m_coordinator.get())
        scrollingCoordinator->setScrollbarLayoutDirection(checkedScrollableArea(), scrollbarLayoutDirection);
}

bool ScrollbarsControllerCoordinated::shouldDrawIntoScrollbarLayer(WebCore::Scrollbar& scrollbar) const
{
    return scrollbar.isCustomScrollbar() || scrollbar.isMockScrollbar();
}

void ScrollbarsControllerCoordinated::updateScrollbarEnabledState(WebCore::Scrollbar& scrollbar)
{
    if (auto scrollingCoordinator = m_coordinator.get())
        scrollingCoordinator->setScrollbarEnabled(scrollbar);
}

void ScrollbarsControllerCoordinated::updateScrollbarStyle()
{
    auto& theme = WebCore::ScrollbarTheme::theme();
    if (theme.isMockTheme())
        return;

    // The different scrollbar styles have different thicknesses, so we must re-set the
    // frameRect to the new thickness, and the re-layout below will ensure the position
    // and length are properly updated.
    updateScrollbarsThickness();

    checkedScrollableArea()->scrollbarStyleChanged(theme.usesOverlayScrollbars() ? WebCore::ScrollbarStyle::Overlay : WebCore::ScrollbarStyle::AlwaysVisible, true);
}

void ScrollbarsControllerCoordinated::scrollbarOpacityChanged()
{
    if (auto scrollingCoordinator = m_coordinator.get())
        scrollingCoordinator->setScrollbarOpacity(checkedScrollableArea());
}

void ScrollbarsControllerCoordinated::hoveredPartChanged(WebCore::Scrollbar& scrollbar)
{
    if (auto scrollingCoordinator = m_coordinator.get())
        scrollingCoordinator->setHoveredAndPressedScrollbarParts(checkedScrollableArea());
}

void ScrollbarsControllerCoordinated::pressedPartChanged(WebCore::Scrollbar& scrollbar)
{
    if (auto scrollingCoordinator = m_coordinator.get())
        scrollingCoordinator->setHoveredAndPressedScrollbarParts(checkedScrollableArea());
}

}
#endif // USE(COORDINATED_GRAPHICS_ASYNC_SCROLLBAR)