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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_RENDERER_INPUT_INPUT_HANDLER_PROXY_CLIENT_H_
      6 #define CONTENT_RENDERER_INPUT_INPUT_HANDLER_PROXY_CLIENT_H_
      7 
      8 namespace blink {
      9 class WebGestureCurve;
     10 struct WebActiveWheelFlingParameters;
     11 struct WebFloatPoint;
     12 struct WebSize;
     13 }
     14 
     15 namespace content {
     16 
     17 struct DidOverscrollParams;
     18 
     19 // All callbacks invoked from the compositor thread.
     20 class InputHandlerProxyClient {
     21  public:
     22   // Called just before the InputHandlerProxy shuts down.
     23   virtual void WillShutdown() = 0;
     24 
     25   // Transfers an active wheel fling animation initiated by a previously
     26   // handled input event out to the client.
     27   virtual void TransferActiveWheelFlingAnimation(
     28       const blink::WebActiveWheelFlingParameters& params) = 0;
     29 
     30   // Creates a new fling animation curve instance for device |device_source|
     31   // with |velocity| and already scrolled |cumulative_scroll| pixels.
     32   virtual blink::WebGestureCurve* CreateFlingAnimationCurve(
     33       blink::WebGestureDevice device_source,
     34       const blink::WebFloatPoint& velocity,
     35       const blink::WebSize& cumulative_scroll) = 0;
     36 
     37   virtual void DidOverscroll(const DidOverscrollParams& params) = 0;
     38 
     39   virtual void DidStopFlinging() = 0;
     40 
     41  protected:
     42   virtual ~InputHandlerProxyClient() {}
     43 };
     44 
     45 }  // namespace content
     46 
     47 #endif  // CONTENT_RENDERER_INPUT_INPUT_HANDLER_PROXY_CLIENT_H_
     48