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/*
* Copyright (C) 2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "FloatPoint.h"
#include "FloatSize.h"
#include <wtf/FastMalloc.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
class Scrollbar;
class ScrollableArea;
enum class ScrollbarOrientation : uint8_t;
class ScrollbarsController {
WTF_MAKE_FAST_ALLOCATED;
WTF_MAKE_NONCOPYABLE(ScrollbarsController);
public:
WEBCORE_EXPORT static std::unique_ptr<ScrollbarsController> create(ScrollableArea&);
WEBCORE_EXPORT explicit ScrollbarsController(ScrollableArea&);
virtual ~ScrollbarsController() = default;
ScrollableArea& scrollableArea() const { return m_scrollableArea; }
bool scrollbarAnimationsUnsuspendedByUserInteraction() const { return m_scrollbarAnimationsUnsuspendedByUserInteraction; }
void setScrollbarAnimationsUnsuspendedByUserInteraction(bool unsuspended) { m_scrollbarAnimationsUnsuspendedByUserInteraction = unsuspended; }
bool shouldSuspendScrollbarAnimations() const;
virtual void notifyContentAreaScrolled(const FloatSize&) { }
WEBCORE_EXPORT virtual void cancelAnimations();
WEBCORE_EXPORT virtual void didBeginScrollGesture();
WEBCORE_EXPORT virtual void didEndScrollGesture();
WEBCORE_EXPORT virtual void mayBeginScrollGesture();
WEBCORE_EXPORT virtual void contentAreaWillPaint() const { }
WEBCORE_EXPORT virtual void mouseEnteredContentArea() { }
WEBCORE_EXPORT virtual void mouseExitedContentArea() { }
WEBCORE_EXPORT virtual void mouseMovedInContentArea() { }
WEBCORE_EXPORT virtual void mouseEnteredScrollbar(Scrollbar*) const { }
WEBCORE_EXPORT virtual void mouseExitedScrollbar(Scrollbar*) const { }
WEBCORE_EXPORT virtual void mouseIsDownInScrollbar(Scrollbar*, bool) const { }
WEBCORE_EXPORT virtual void willStartLiveResize() { }
WEBCORE_EXPORT virtual void contentsSizeChanged() const { }
WEBCORE_EXPORT virtual void willEndLiveResize() { }
WEBCORE_EXPORT virtual void contentAreaDidShow() { }
WEBCORE_EXPORT virtual void contentAreaDidHide() { }
WEBCORE_EXPORT virtual void lockOverlayScrollbarStateToHidden(bool) { }
WEBCORE_EXPORT virtual bool scrollbarsCanBeActive() const { return true; }
WEBCORE_EXPORT virtual void didAddVerticalScrollbar(Scrollbar*) { }
WEBCORE_EXPORT virtual void willRemoveVerticalScrollbar(Scrollbar*) { }
WEBCORE_EXPORT virtual void didAddHorizontalScrollbar(Scrollbar*) { }
WEBCORE_EXPORT virtual void willRemoveHorizontalScrollbar(Scrollbar*) { }
WEBCORE_EXPORT virtual void invalidateScrollbarPartLayers(Scrollbar*) { }
WEBCORE_EXPORT virtual void verticalScrollbarLayerDidChange() { }
WEBCORE_EXPORT virtual void horizontalScrollbarLayerDidChange() { }
WEBCORE_EXPORT virtual bool shouldScrollbarParticipateInHitTesting(Scrollbar*) { return true; }
WEBCORE_EXPORT virtual String horizontalScrollbarStateForTesting() const { return emptyString(); }
WEBCORE_EXPORT virtual String verticalScrollbarStateForTesting() const { return emptyString(); }
WEBCORE_EXPORT virtual void setScrollbarVisibilityState(ScrollbarOrientation, bool) { }
WEBCORE_EXPORT virtual bool shouldDrawIntoScrollbarLayer(Scrollbar&) const { return true; }
WEBCORE_EXPORT virtual bool shouldRegisterScrollbars() const { return true; }
WEBCORE_EXPORT virtual void updateScrollbarEnabledState(Scrollbar&) { }
WEBCORE_EXPORT virtual void setScrollbarMinimumThumbLength(WebCore::ScrollbarOrientation, int) { }
WEBCORE_EXPORT virtual int minimumThumbLength(WebCore::ScrollbarOrientation) { return 0; }
private:
ScrollableArea& m_scrollableArea;
bool m_scrollbarAnimationsUnsuspendedByUserInteraction { true };
};
} // namespace WebCore
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