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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_BROWSER_RENDERER_HOST_INPUT_TOUCHSCREEN_TAP_SUPPRESSION_CONTROLLER_H_
      6 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCHSCREEN_TAP_SUPPRESSION_CONTROLLER_H_
      7 
      8 #include "base/memory/scoped_ptr.h"
      9 #include "content/browser/renderer_host/input/gesture_event_filter.h"
     10 #include "content/browser/renderer_host/input/tap_suppression_controller_client.h"
     11 
     12 namespace content {
     13 
     14 class GestureEventFilter;
     15 class TapSuppressionController;
     16 
     17 // Controls the suppression of touchscreen taps immediately following the
     18 // dispatch of a GestureFlingCancel event.
     19 class TouchscreenTapSuppressionController
     20     : public TapSuppressionControllerClient {
     21  public:
     22   explicit TouchscreenTapSuppressionController(GestureEventFilter* gef);
     23   virtual ~TouchscreenTapSuppressionController();
     24 
     25   // Should be called on arrival of GestureFlingCancel events.
     26   void GestureFlingCancel();
     27 
     28   // Should be called on arrival of ACK for a GestureFlingCancel event.
     29   // |processed| is true if the GestureFlingCancel successfully stopped a fling.
     30   void GestureFlingCancelAck(bool processed);
     31 
     32   // Should be called on arrival of GestureTapDown events. Returns true if the
     33   // caller should stop normal handling of the GestureTapDown. In this case, the
     34   // caller is responsible for saving the event for later use, if needed.
     35   bool ShouldDeferGestureTapDown(const GestureEventWithLatencyInfo& event);
     36 
     37   // Should be called on arrival of GestureTap events. Returns true if the
     38   // caller should stop normal handling of the GestureTap.
     39   bool ShouldSuppressGestureTap();
     40 
     41   // Should be called on arrival of GestureTapCancel events. Returns true if the
     42   // caller should stop normal handling of the GestureTapCancel.
     43   bool ShouldSuppressGestureTapCancel();
     44 
     45  private:
     46   // TapSuppressionControllerClient implementation.
     47   virtual int MaxCancelToDownTimeInMs() OVERRIDE;
     48   virtual int MaxTapGapTimeInMs() OVERRIDE;
     49   virtual void DropStashedTapDown() OVERRIDE;
     50   virtual void ForwardStashedTapDownForDeferral() OVERRIDE;
     51   virtual void ForwardStashedTapDownSkipDeferral() OVERRIDE;
     52 
     53   GestureEventFilter* gesture_event_filter_;
     54   GestureEventWithLatencyInfo stashed_tap_down_;
     55 
     56   // The core controller of tap suppression.
     57   scoped_ptr<TapSuppressionController> controller_;
     58 
     59   DISALLOW_COPY_AND_ASSIGN(TouchscreenTapSuppressionController);
     60 };
     61 
     62 }  // namespace content
     63 
     64 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCHSCREEN_TAP_SUPPRESSION_CONTROLLER_H_
     65