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/*
* Copyright (c) 2010, Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER 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.
*/
#ifndef ScrollAnimatorBase_h
#define ScrollAnimatorBase_h
#include "platform/PlatformExport.h"
#include "platform/heap/Handle.h"
#include "platform/scroll/ScrollAnimatorCompositorCoordinator.h"
#include "platform/scroll/ScrollTypes.h"
#include "wtf/Forward.h"
namespace blink {
class CompositorAnimationTimeline;
class ScrollableArea;
class Scrollbar;
class PLATFORM_EXPORT ScrollAnimatorBase
: public ScrollAnimatorCompositorCoordinator {
public:
static ScrollAnimatorBase* create(ScrollableArea*);
virtual ~ScrollAnimatorBase();
virtual void dispose() {}
// A possibly animated scroll. The base class implementation always scrolls
// immediately, never animates. If the scroll is animated and currently the
// animator has an in-progress animation, the ScrollResult will always return
// no unusedDelta and didScroll=true, i.e. fully consuming the scroll request.
// This makes animations latch to a single scroller. Note, the semantics are
// currently somewhat different on Mac - see ScrollAnimatorMac.mm.
virtual ScrollResult userScroll(ScrollGranularity, const ScrollOffset& delta);
virtual void scrollToOffsetWithoutAnimation(const ScrollOffset&);
void setCurrentOffset(const ScrollOffset&);
ScrollOffset currentOffset() const;
virtual ScrollOffset desiredTargetOffset() const { return currentOffset(); }
// Returns how much of pixelDelta will be used by the underlying scrollable
// area.
virtual ScrollOffset computeDeltaToConsume(const ScrollOffset& delta) const;
// ScrollAnimatorCompositorCoordinator implementation.
ScrollableArea* getScrollableArea() const override {
return m_scrollableArea;
}
void tickAnimation(double monotonicTime) override{};
void cancelAnimation() override {}
void takeOverCompositorAnimation() override {}
void updateCompositorAnimations() override{};
void notifyCompositorAnimationFinished(int groupId) override{};
void notifyCompositorAnimationAborted(int groupId) override{};
void layerForCompositedScrollingDidChange(
CompositorAnimationTimeline*) override{};
virtual void contentAreaWillPaint() const {}
virtual void mouseEnteredContentArea() const {}
virtual void mouseExitedContentArea() const {}
virtual void mouseMovedInContentArea() const {}
virtual void mouseEnteredScrollbar(Scrollbar&) const {}
virtual void mouseExitedScrollbar(Scrollbar&) const {}
virtual void contentsResized() const {}
virtual void contentAreaDidShow() const {}
virtual void contentAreaDidHide() const {}
virtual void finishCurrentScrollAnimations() {}
virtual void didAddVerticalScrollbar(Scrollbar&) {}
virtual void willRemoveVerticalScrollbar(Scrollbar&) {}
virtual void didAddHorizontalScrollbar(Scrollbar&) {}
virtual void willRemoveHorizontalScrollbar(Scrollbar&) {}
virtual void notifyContentAreaScrolled(const ScrollOffset&) {}
virtual bool setScrollbarsVisibleForTesting(bool) { return false; }
DECLARE_VIRTUAL_TRACE();
protected:
explicit ScrollAnimatorBase(ScrollableArea*);
virtual void notifyOffsetChanged();
Member<ScrollableArea> m_scrollableArea;
ScrollOffset m_currentOffset;
};
} // namespace blink
#endif // ScrollAnimatorBase_h
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