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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 CC_INPUT_INPUT_HANDLER_H_
#define CC_INPUT_INPUT_HANDLER_H_
#include "base/basictypes.h"
#include "base/time.h"
#include "cc/base/cc_export.h"
#include "third_party/WebKit/Source/Platform/chromium/public/WebScrollbar.h"
namespace gfx {
class Point;
class PointF;
class Vector2d;
class Vector2dF;
}
namespace cc {
// The InputHandler is a way for the embedders to interact with
// the impl thread side of the compositor implementation.
//
// There is one InputHandler for every LayerTreeHost. It is
// created on the main thread and used only on the impl thread.
//
// The InputHandler is constructed with a InputHandlerClient, which is the
// interface by which the handler can manipulate the LayerTree.
class CC_EXPORT InputHandlerClient {
public:
enum ScrollStatus { ScrollOnMainThread, ScrollStarted, ScrollIgnored };
enum ScrollInputType { Gesture, Wheel, NonBubblingGesture };
// 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(gfx::Point viewport_point,
ScrollInputType type) = 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. If no layer can be moved in the requested
// direction at all, then false is returned. If any layer is moved, then
// true is returned.
// Should only be called if ScrollBegin() returned ScrollStarted.
virtual bool ScrollBy(gfx::Point viewport_point,
gfx::Vector2dF scroll_delta) = 0;
virtual bool ScrollVerticallyByPage(
gfx::Point viewport_point,
WebKit::WebScrollbar::ScrollDirection direction) = 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 magnify_delta, gfx::Point anchor) = 0;
virtual void PinchGestureEnd() = 0;
virtual void StartPageScaleAnimation(gfx::Vector2d target_offset,
bool anchor_point,
float page_scale,
base::TimeTicks start_time,
base::TimeDelta duration) = 0;
// Request another callback to InputHandler::Animate().
virtual void ScheduleAnimation() = 0;
virtual bool HaveTouchEventHandlersAt(gfx::Point viewport_point) = 0;
protected:
InputHandlerClient() {}
virtual ~InputHandlerClient() {}
private:
DISALLOW_COPY_AND_ASSIGN(InputHandlerClient);
};
class CC_EXPORT InputHandler {
public:
virtual ~InputHandler() {}
virtual void BindToClient(InputHandlerClient* client) = 0;
virtual void Animate(base::TimeTicks time) = 0;
virtual void MainThreadHasStoppedFlinging() = 0;
protected:
InputHandler() {}
private:
DISALLOW_COPY_AND_ASSIGN(InputHandler);
};
} // namespace cc
#endif // CC_INPUT_INPUT_HANDLER_H_
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