ui/events/gestures/gesture_provider_aura.cc

   1 // Copyright 2014 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 #include "ui/events/gestures/gesture_provider_aura.h"
   6
   7 #include "base/auto_reset.h"
   8 #include "base/logging.h"
   9 #include "ui/events/event.h"
  10 #include "ui/events/gesture_detection/gesture_configuration.h"
  11 #include "ui/events/gesture_detection/gesture_event_data.h"
  12 #include "ui/events/gesture_detection/gesture_provider_config_helper.h"
  13
  14 namespace ui {
  15
  16 GestureProviderAura::GestureProviderAura(GestureProviderAuraClient* client)
  17     : client_(client),
  18       filtered_gesture_provider_(
  19           GetGestureProviderConfig(GestureProviderConfigType::CURRENT_PLATFORM),
  20           this),
  21       handling_event_(false),
  22       last_unique_touch_event_id_(
  23           std::numeric_limits<unsigned long long>::max()) {
  24   filtered_gesture_provider_.SetDoubleTapSupportForPlatformEnabled(false);
  25 }
  26
  27 GestureProviderAura::~GestureProviderAura() {}
  28
  29 bool GestureProviderAura::OnTouchEvent(TouchEvent* event) {
  30   if (!pointer_state_.OnTouch(*event))
  31     return false;
  32
  33   last_unique_touch_event_id_ = event->unique_event_id();
  34   last_touch_event_latency_info_ = *event->latency();
  35
  36   auto result = filtered_gesture_provider_.OnTouchEvent(pointer_state_);
  37   if (!result.succeeded)
  38     return false;
  39
  40   event->set_may_cause_scrolling(result.did_generate_scroll);
  41   pointer_state_.CleanupRemovedTouchPoints(*event);
  42   return true;
  43 }
  44
  45 void GestureProviderAura::OnAsyncTouchEventAck(bool event_consumed) {
  46   DCHECK(pending_gestures_.empty());
  47   DCHECK(!handling_event_);
  48   base::AutoReset<bool> handling_event(&handling_event_, true);
  49   filtered_gesture_provider_.OnAsyncTouchEventAck(event_consumed);
  50   last_touch_event_latency_info_.Clear();
  51 }
  52
  53 void GestureProviderAura::OnSyncTouchEventAck(const uint64 unique_event_id,
  54                                               bool event_consumed) {
  55   DCHECK_EQ(last_unique_touch_event_id_, unique_event_id);
  56   DCHECK(pending_gestures_.empty());
  57   DCHECK(!handling_event_);
  58   base::AutoReset<bool> handling_event(&handling_event_, true);
  59   filtered_gesture_provider_.OnSyncTouchEventAck(event_consumed);
  60   last_touch_event_latency_info_.Clear();
  61 }
  62
  63 void GestureProviderAura::OnGestureEvent(
  64     const GestureEventData& gesture) {
  65   GestureEventDetails details = gesture.details;
  66   details.set_oldest_touch_id(gesture.motion_event_id);
  67
  68   if (gesture.type() == ET_GESTURE_TAP) {
  69     int tap_count = 1;
  70     if (previous_tap_ && IsConsideredDoubleTap(*previous_tap_, gesture))
  71       tap_count = 1 + (previous_tap_->details.tap_count() % 3);
  72     details.set_tap_count(tap_count);
  73     if (!previous_tap_)
  74       previous_tap_.reset(new GestureEventData(gesture));
  75     else
  76       *previous_tap_ = gesture;
  77     previous_tap_->details = details;
  78   } else if (gesture.type() == ET_GESTURE_TAP_CANCEL) {
  79     previous_tap_.reset();
  80   }
  81
  82   scoped_ptr<ui::GestureEvent> event(
  83       new ui::GestureEvent(gesture.x,
  84                            gesture.y,
  85                            gesture.flags,
  86                            gesture.time - base::TimeTicks(),
  87                            details));
  88
  89   ui::LatencyInfo* gesture_latency = event->latency();
  90
  91   gesture_latency->CopyLatencyFrom(
  92       last_touch_event_latency_info_,
  93       ui::INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT);
  94   gesture_latency->CopyLatencyFrom(
  95       last_touch_event_latency_info_,
  96       ui::INPUT_EVENT_LATENCY_UI_COMPONENT);
  97   gesture_latency->CopyLatencyFrom(
  98       last_touch_event_latency_info_,
  99       ui::INPUT_EVENT_LATENCY_ACK_RWH_COMPONENT);
 100
 101   if (!handling_event_) {
 102     // Dispatching event caused by timer.
 103     client_->OnGestureEvent(event.get());
 104   } else {
 105     // Memory managed by ScopedVector pending_gestures_.
 106     pending_gestures_.push_back(event.release());
 107   }
 108 }
 109
 110 ScopedVector<GestureEvent>* GestureProviderAura::GetAndResetPendingGestures() {
 111   if (pending_gestures_.empty())
 112     return NULL;
 113   // Caller is responsible for deleting old_pending_gestures.
 114   ScopedVector<GestureEvent>* old_pending_gestures =
 115       new ScopedVector<GestureEvent>();
 116   old_pending_gestures->swap(pending_gestures_);
 117   return old_pending_gestures;
 118 }
 119
 120 bool GestureProviderAura::IsConsideredDoubleTap(
 121     const GestureEventData& previous_tap,
 122     const GestureEventData& current_tap) const {
 123   if (current_tap.time - previous_tap.time >
 124       base::TimeDelta::FromMilliseconds(
 125           GestureConfiguration::GetInstance()
 126               ->max_time_between_double_click_in_ms())) {
 127     return false;
 128   }
 129
 130   float double_tap_slop_square =
 131       GestureConfiguration::GetInstance()
 132           ->max_distance_between_taps_for_double_tap();
 133   double_tap_slop_square *= double_tap_slop_square;
 134   const float delta_x = previous_tap.x - current_tap.x;
 135   const float delta_y = previous_tap.y - current_tap.y;
 136   return (delta_x * delta_x + delta_y * delta_y < double_tap_slop_square);
 137 }
 138
 139 }  // namespace content