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/* Copyright (C) 2011 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:
* 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.
*/
#ifndef CCInputHandler_h
#define CCInputHandler_h
#include <wtf/Noncopyable.h>
#include <wtf/PassOwnPtr.h>
namespace WebCore {
class IntPoint;
class IntSize;
// The CCInputHandler is a way for the embedders to interact with
// the impl thread side of the compositor implementation.
//
// There is one CCInputHandler for every CCLayerTreeHost. It is
// created and used only on the impl thread.
//
// The CCInputHandler is constructed with an InputHandlerClient, which is the
// interface by which the handler can manipulate the LayerTree.
class CCInputHandlerClient {
WTF_MAKE_NONCOPYABLE(CCInputHandlerClient);
public:
virtual void setNeedsRedraw() = 0;
enum ScrollStatus { ScrollFailed, ScrollStarted, ScrollIgnored };
// Attempt to start scrolling a layer at a given point in window
// coordinates. Returns ScrollStarted if the layer at the coordinates can
// be scrolled, ScrollFailed if the scroll event should instead be
// delegated to the main thread, or ScrollIgnored if there is nothing to
// be scrolled at the given coordinates.
virtual ScrollStatus scrollBegin(const IntPoint&) = 0;
// Scroll the layer selected with scrollBegin(). If there is no room to
// move the layer in the requested direction, its first ancestor layer that
// can be scrolled will be moved instead. Should only be called if
// scrollBegin() returned ScrollStarted.
virtual void scrollBy(const IntSize&) = 0;
// Stop scrolling the layer selected with scrollBegin(). Should only be
// called if scrollBegin() returned ScrollStarted.
virtual void scrollEnd() = 0;
virtual bool haveWheelEventHandlers() = 0;
virtual void pinchGestureBegin() = 0;
virtual void pinchGestureUpdate(float magnifyDelta, const IntPoint& anchor) = 0;
virtual void pinchGestureEnd() = 0;
virtual void startPageScaleAnimation(const IntSize& targetPosition,
bool anchorPoint,
float pageScale,
double startTimeMs,
double durationMs) = 0;
protected:
CCInputHandlerClient() { }
virtual ~CCInputHandlerClient() { }
};
class CCInputHandler {
WTF_MAKE_NONCOPYABLE(CCInputHandler);
public:
static PassOwnPtr<CCInputHandler> create(CCInputHandlerClient*);
virtual ~CCInputHandler() { }
virtual int identifier() const = 0;
virtual void willDraw(double frameDisplayTimeMs) = 0;
protected:
CCInputHandler() { }
};
}
#endif
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