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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 <wtf/Noncopyable.h>
#include <wtf/PassOwnPtr.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 {
WTF_MAKE_NONCOPYABLE(CCInputHandlerClient);
public:
enum ScrollStatus { ScrollOnMainThread, ScrollStarted, ScrollIgnored };
enum ScrollInputType { Gesture, Wheel };
// Selects a layer to be scrolled at a given point in window 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 window coordinate. 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() { }
};
class CCInputHandler {
WTF_MAKE_NONCOPYABLE(CCInputHandler);
public:
virtual ~CCInputHandler() { }
virtual void bindToClient(CCInputHandlerClient*) = 0;
virtual void animate(double monotonicTime) = 0;
protected:
CCInputHandler() { }
};
}
#endif
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