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// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CCInputHandler_h
#define CCInputHandler_h
#include "base/basictypes.h"
namespace cc {
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 on the main thread and used only on the impl thread.
//
// The CCInputHandler is constructed with a CCInputHandlerClient, which is the
// interface by which the handler can manipulate the LayerTree.
class CCInputHandlerClient {
public:
enum ScrollStatus { ScrollOnMainThread, ScrollStarted, ScrollIgnored };
enum ScrollInputType { Gesture, Wheel };
// Selects a layer to be scrolled at a given point in viewport (logical
// pixel) coordinates. Returns ScrollStarted if the layer at the coordinates
// can be scrolled, ScrollOnMainThread 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&, ScrollInputType) = 0;
// Scroll the selected layer starting at the given position. If the scroll
// type given to scrollBegin was a gesture, then the scroll point and delta
// should be in viewport (logical pixel) coordinates. Otherwise they are in
// scrolling layer's (logical pixel) space. 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 IntPoint&, const IntSize&) = 0;
// Stop scrolling the selected layer. Should only be called if scrollBegin()
// returned ScrollStarted.
virtual void scrollEnd() = 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 startTime,
double duration) = 0;
// Request another callback to CCInputHandler::animate().
virtual void scheduleAnimation() = 0;
protected:
CCInputHandlerClient() { }
virtual ~CCInputHandlerClient() { }
private:
DISALLOW_COPY_AND_ASSIGN(CCInputHandlerClient);
};
class CCInputHandler {
public:
virtual ~CCInputHandler() { }
virtual void bindToClient(CCInputHandlerClient*) = 0;
virtual void animate(double monotonicTime) = 0;
protected:
CCInputHandler() { }
private:
DISALLOW_COPY_AND_ASSIGN(CCInputHandler);
};
}
#endif
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