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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_GESTURE_EVENT_FILTER_H_ | |
| 6 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_EVENT_FILTER_H_ | |
| 7 | |
| 8 #include <deque> | |
| 9 | |
| 10 #include "base/basictypes.h" | |
| 11 #include "base/memory/scoped_ptr.h" | |
| 12 #include "base/timer/timer.h" | |
| 13 #include "content/browser/renderer_host/input/base_gesture_event_filter.h" | |
| 14 #include "content/browser/renderer_host/input/gesture_event_filter_client.h" | |
| 15 #include "content/common/content_export.h" | |
| 16 #include "content/port/browser/event_with_latency_info.h" | |
| 17 #include "content/port/common/input_event_ack_state.h" | |
| 18 #include "third_party/WebKit/public/web/WebInputEvent.h" | |
| 19 #include "ui/gfx/transform.h" | |
| 20 | |
| 21 namespace content { | |
| 22 class GestureEventFilterTest; | |
| 23 class InputRouter; | |
| 24 class MockRenderWidgetHost; | |
| 25 class TouchpadTapSuppressionController; | |
| 26 class TouchpadTapSuppressionControllerClient; | |
| 27 class TouchscreenTapSuppressionController; | |
| 28 | |
| 29 // Adds the following filters on top of BaseGestureEventFilter's filtering | |
| 30 // 1. Zero-velocity fling-starts from touchpad are filtered. | |
| 31 // 2. Unnecessary GestureFlingCancel events are filtered. These are | |
| 32 // GestureFlingCancels that have no corresponding GestureFlingStart in the | |
| 33 // queue. | |
| 34 // 3. Taps immediately after a GestureFlingCancel (caused by the same tap) are | |
| 35 // filtered. | |
| 36 class CONTENT_EXPORT GestureEventFilter : public BaseGestureEventFilter { | |
| 37 public: | |
| 38 // Both |client| and |touchpad_client| must outlive the GestureEventFilter. | |
| 39 GestureEventFilter(GestureEventFilterClient* client, | |
| 40 TouchpadTapSuppressionControllerClient* touchpad_client); | |
| 41 ~GestureEventFilter(); | |
| 42 | |
| 43 // Overridden from BaseGestureEventFilter. | |
| 44 virtual bool ShouldForward(const GestureEventWithLatencyInfo&) OVERRIDE; | |
| 45 virtual void ProcessGestureAck(InputEventAckState ack_result, | |
| 46 WebKit::WebInputEvent::Type type, | |
| 47 const ui::LatencyInfo& latency) OVERRIDE; | |
| 48 | |
| 49 // Sets the state of the |fling_in_progress_| field to indicate that a fling | |
| 50 // is definitely not in progress. | |
| 51 void FlingHasBeenHalted(); | |
| 52 | |
| 53 // Returns the |TouchpadTapSuppressionController| instance. | |
| 54 TouchpadTapSuppressionController* GetTouchpadTapSuppressionController(); | |
| 55 | |
| 56 private: | |
| 57 friend class MockRenderWidgetHost; | |
| 58 friend class GestureEventFilterTest; | |
| 59 | |
| 60 // Overridden from BaseGestureEventFilter. | |
| 61 virtual bool ShouldForwardScrollEndingEvent( | |
| 62 const GestureEventWithLatencyInfo& event) OVERRIDE; | |
| 63 virtual bool ShouldForwardForCoalescing( | |
| 64 const GestureEventWithLatencyInfo& gesture_event) OVERRIDE; | |
| 65 | |
| 66 // Returns |true| if the given GestureFlingCancel should be discarded | |
| 67 // as unnecessary. | |
| 68 bool ShouldDiscardFlingCancelEvent( | |
| 69 const GestureEventWithLatencyInfo& gesture_event) const; | |
| 70 | |
| 71 // Sub-filter for removing zero-velocity fling-starts from touchpad. | |
| 72 bool ShouldForwardForZeroVelocityFlingStart( | |
| 73 const GestureEventWithLatencyInfo& gesture_event) const; | |
| 74 | |
| 75 // Sub-filter for removing unnecessary GestureFlingCancels. | |
| 76 bool ShouldForwardForGFCFiltering( | |
| 77 const GestureEventWithLatencyInfo& gesture_event) const; | |
| 78 | |
| 79 // Sub-filter for suppressing taps immediately after a GestureFlingCancel. | |
| 80 bool ShouldForwardForTapSuppression( | |
| 81 const GestureEventWithLatencyInfo& gesture_event); | |
| 82 | |
| 83 // True if a GestureFlingStart is in progress on the renderer or | |
| 84 // queued without a subsequent queued GestureFlingCancel event. | |
| 85 bool fling_in_progress_; | |
| 86 | |
| 87 // An object tracking the state of touchpad on the delivery of mouse events to | |
| 88 // the renderer to filter mouse immediately after a touchpad fling canceling | |
| 89 // tap. | |
| 90 // TODO(mohsen): Move touchpad tap suppression out of GestureEventFilter since | |
| 91 // GEF is meant to only be used for touchscreen gesture events. | |
| 92 scoped_ptr<TouchpadTapSuppressionController> | |
| 93 touchpad_tap_suppression_controller_; | |
| 94 | |
| 95 // An object tracking the state of touchscreen on the delivery of gesture tap | |
| 96 // events to the renderer to filter taps immediately after a touchscreen fling | |
| 97 // canceling tap. | |
| 98 scoped_ptr<TouchscreenTapSuppressionController> | |
| 99 touchscreen_tap_suppression_controller_; | |
| 100 | |
| 101 DISALLOW_COPY_AND_ASSIGN(GestureEventFilter); | |
| 102 }; | |
| 103 | |
| 104 } // namespace content | |
| 105 | |
| 106 #endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_EVENT_FILTER_H_ | |
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Chromium Code Reviews
Issue 43203004:
Remove GestureEventFilter and clean up related bits assuming that we turn on
Base URL: svn://svn.chromium.org/chrome/trunk/src