content/browser/renderer_host/smooth_scroll_gesture_controller.h

   1 // Copyright (c) 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_BROWSER_RENDERER_HOST_SMOOTH_SCROLL_GESTURE_CONTROLLER_H_
   6 #define CONTENT_BROWSER_RENDERER_HOST_SMOOTH_SCROLL_GESTURE_CONTROLLER_H_
   7
   8 #include <map>
   9
  10 #include "base/memory/weak_ptr.h"
  11 #include "base/time.h"
  12 #include "base/timer.h"
  13 #include "content/common/content_export.h"
  14
  15 struct ViewHostMsg_BeginSmoothScroll_Params;
  16
  17 namespace content {
  18
  19 class RenderWidgetHost;
  20 class RenderWidgetHostViewPort;
  21 class SmoothScrollGesture;
  22
  23 // Controls SmoothScrollGestures, used to inject synthetic events
  24 // for performance test harness.
  25 class CONTENT_EXPORT SmoothScrollGestureController {
  26  public:
  27   SmoothScrollGestureController();
  28   ~SmoothScrollGestureController();
  29
  30   // Initiates a synthetic event stream.
  31   void BeginSmoothScroll(RenderWidgetHostViewPort* view,
  32                          const ViewHostMsg_BeginSmoothScroll_Params& params);
  33
  34   base::TimeDelta GetSyntheticScrollMessageInterval() const;
  35
  36  private:
  37   // Called periodically to advance the active scroll gesture after being
  38   // initiated by OnBeginSmoothScroll.
  39   void OnTimer();
  40
  41   base::RepeatingTimer<SmoothScrollGestureController> timer_;
  42
  43   RenderWidgetHost* rwh_;
  44
  45   scoped_refptr<SmoothScrollGesture> pending_smooth_scroll_gesture_;
  46
  47   DISALLOW_COPY_AND_ASSIGN(SmoothScrollGestureController);
  48 };
  49
  50 }  // namespace content
  51
  52 #endif  // CONTENT_BROWSER_RENDERER_HOST_SMOOTH_SCROLL_GESTURE_CONTROLLER_H_