content/browser/renderer_host/input/synthetic_gesture_target.h

   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_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_TARGET_H_
   6 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_TARGET_H_
   7
   8 #include "base/time/time.h"
   9 #include "content/browser/renderer_host/input/synthetic_gesture.h"
  10 #include "content/common/content_export.h"
  11 #include "content/common/input/synthetic_gesture_params.h"
  12
  13 namespace blink {
  14 class WebInputEvent;
  15 }
  16
  17 namespace content {
  18
  19 // Interface between the synthetic gesture controller and the RenderWidgetHost.
  20 class CONTENT_EXPORT SyntheticGestureTarget {
  21  public:
  22   SyntheticGestureTarget() {}
  23   virtual ~SyntheticGestureTarget() {}
  24
  25   // Allows synthetic gestures to insert input events in the highest level of
  26   // input processing on the target platform (e.g. Java on Android), so that
  27   // the event traverses the entire input processing stack.
  28   virtual void DispatchInputEventToPlatform(
  29       const blink::WebInputEvent& event) = 0;
  30
  31   // Called by SyntheticGestureController to request a flush at a time
  32   // appropriate for the platform, e.g. aligned with vsync.
  33   virtual void SetNeedsFlush() = 0;
  34
  35   // Returns the default gesture source type for the target.
  36   virtual SyntheticGestureParams::GestureSourceType
  37       GetDefaultSyntheticGestureSourceType() const = 0;
  38
  39   // After how much time of inaction does the target assume that a pointer has
  40   // stopped moving.
  41   virtual base::TimeDelta PointerAssumedStoppedTime() const = 0;
  42
  43   // Returns the maximum number of DIPs a touch pointer can move without being
  44   // considered moving by the platform.
  45   virtual float GetTouchSlopInDips() const = 0;
  46
  47   // Returns the minimum number of DIPs two touch pointers have to be apart
  48   // to perform a pinch-zoom.
  49   virtual float GetMinScalingSpanInDips() const = 0;
  50 };
  51
  52 }  // namespace content
  53
  54 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_TARGET_H_