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/*
* Copyright (C) 2006, 2007, 2009, 2010, 2011 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. ``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
* 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 "IntPoint.h"
#include "Timer.h"
#include <wtf/CheckedPtr.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/WallTime.h>
namespace WebCore {
class EventHandler;
class LocalFrame;
class LocalFrameView;
class Node;
class PlatformMouseEvent;
class RenderBox;
class RenderObject;
enum class AutoscrollType : uint8_t {
None,
DragAndDrop,
Selection,
#if ENABLE(PAN_SCROLLING)
PanCanStop,
Pan,
#endif
};
// When the autoscroll or the panScroll is triggered when do the scroll every 50ms to make it smooth.
constexpr Seconds autoscrollInterval { 50_ms };
// AutscrollController handles autoscroll and pan scroll for EventHandler.
class AutoscrollController final : public CanMakeCheckedPtr<AutoscrollController> {
WTF_MAKE_TZONE_ALLOCATED(AutoscrollController);
WTF_OVERRIDE_DELETE_FOR_CHECKED_PTR(AutoscrollController);
public:
AutoscrollController();
RenderBox* autoscrollRenderer() const;
bool autoscrollInProgress() const;
bool panScrollInProgress() const;
void startAutoscrollForSelection(RenderObject*);
void stopAutoscrollTimer(bool rendererIsBeingDestroyed = false);
void updateAutoscrollRenderer();
void updateDragAndDrop(Node* targetNode, const IntPoint& eventPosition, WallTime eventTime);
#if ENABLE(PAN_SCROLLING)
void didPanScrollStart();
void didPanScrollStop();
void handleMouseReleaseEvent(const PlatformMouseEvent&);
void setPanScrollInProgress(bool);
void startPanScrolling(RenderBox&, const IntPoint&);
#endif
private:
void autoscrollTimerFired();
void startAutoscrollTimer();
#if ENABLE(PAN_SCROLLING)
void updatePanScrollState(LocalFrameView*, const IntPoint&);
#endif
Timer m_autoscrollTimer;
SingleThreadWeakPtr<RenderBox> m_autoscrollRenderer;
AutoscrollType m_autoscrollType { AutoscrollType::None };
IntPoint m_dragAndDropAutoscrollReferencePosition;
WallTime m_dragAndDropAutoscrollStartTime;
#if ENABLE(PAN_SCROLLING)
IntPoint m_panScrollStartPos;
#endif
};
} // namespace WebCore
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