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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_GPU_INPUT_HANDLER_MANAGER_CLIENT_H_
      6 #define CONTENT_RENDERER_GPU_INPUT_HANDLER_MANAGER_CLIENT_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/callback.h"
     10 #include "base/callback_forward.h"
     11 #include "content/common/content_export.h"
     12 #include "ui/gfx/vector2d_f.h"
     13 
     14 namespace ui {
     15 struct LatencyInfo;
     16 }
     17 
     18 namespace cc {
     19 class InputHandler;
     20 struct DidOverscrollParams;
     21 }
     22 
     23 namespace WebKit {
     24 class WebInputEvent;
     25 }
     26 
     27 namespace content {
     28 
     29 class CONTENT_EXPORT InputHandlerManagerClient {
     30  public:
     31   virtual ~InputHandlerManagerClient() {}
     32 
     33   // The Manager will supply a |handler| when bound to the client. This is valid
     34   // until the manager shuts down, at which point it supplies a null |handler|.
     35   // The client should only makes calls to |handler| on the compositor thread.
     36   typedef base::Callback<
     37       InputEventAckState(int /*routing_id*/,
     38                          const WebKit::WebInputEvent*,
     39                          const ui::LatencyInfo& latency_info)> Handler;
     40 
     41   // Called from the main thread.
     42   virtual void SetBoundHandler(const Handler& handler) = 0;
     43 
     44   // Called from the compositor thread.
     45   virtual void DidAddInputHandler(int routing_id,
     46                                   cc::InputHandler* input_handler) = 0;
     47   virtual void DidRemoveInputHandler(int routing_id) = 0;
     48   virtual void DidOverscroll(int routing_id,
     49                              const cc::DidOverscrollParams& params) = 0;
     50 
     51  protected:
     52   InputHandlerManagerClient() {}
     53 
     54  private:
     55   DISALLOW_COPY_AND_ASSIGN(InputHandlerManagerClient);
     56 };
     57 
     58 }  // namespace content
     59 
     60 #endif  // CONTENT_COMMON_GPU_INPUT_HANDLER_MANAGER_CLIENT_H_
     61