| // 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_HANDLER_H_ |
| #define CC_INPUT_HANDLER_H_ |
| |
| #include "base/basictypes.h" |
| #include "base/time.h" |
| #include "cc/cc_export.h" |
| |
| namespace gfx { |
| class Point; |
| class PointF; |
| class Vector2d; |
| } |
| |
| 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 }; |
| |
| // 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, 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. 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(const gfx::Point&, const gfx::Vector2d&) = 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, gfx::Point anchor) = 0; |
| virtual void pinchGestureEnd() = 0; |
| |
| virtual void startPageScaleAnimation(gfx::Vector2d targetOffset, |
| bool anchorPoint, |
| float pageScale, |
| base::TimeTicks startTime, |
| base::TimeDelta duration) = 0; |
| |
| // Request another callback to InputHandler::animate(). |
| virtual void scheduleAnimation() = 0; |
| |
| virtual bool haveTouchEventHandlersAt(const gfx::Point&) = 0; |
| |
| protected: |
| InputHandlerClient() { } |
| virtual ~InputHandlerClient() { } |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(InputHandlerClient); |
| }; |
| |
| class CC_EXPORT InputHandler { |
| public: |
| virtual ~InputHandler() { } |
| |
| virtual void bindToClient(InputHandlerClient*) = 0; |
| virtual void animate(base::TimeTicks time) = 0; |
| |
| protected: |
| InputHandler() { } |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(InputHandler); |
| }; |
| |
| } |
| |
| #endif // CC_INPUT_HANDLER_H_ |