WindowManagerApp should recognize gestures

ui/events/gestures/gesture_provider_aura.cc

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ui/events/gestures/gesture_provider_aura.h"
-
-#include "base/auto_reset.h"
-#include "base/logging.h"
-#include "ui/events/event.h"
-#include "ui/events/gesture_detection/gesture_config_helper.h"
-#include "ui/events/gesture_detection/gesture_event_data.h"
-#include "ui/events/gestures/gesture_configuration.h"
-
-namespace ui {
-
-GestureProviderAura::GestureProviderAura(GestureProviderAuraClient* client)
-    : client_(client),
-      filtered_gesture_provider_(ui::DefaultGestureProviderConfig(), this),
-      handling_event_(false) {
-  filtered_gesture_provider_.SetDoubleTapSupportForPlatformEnabled(false);
-}
-
-GestureProviderAura::~GestureProviderAura() {}
-
-bool GestureProviderAura::OnTouchEvent(const TouchEvent& event) {
-  int index = pointer_state_.FindPointerIndexOfId(event.touch_id());
-  bool pointer_id_is_active = index != -1;
-
-  if (event.type() == ET_TOUCH_PRESSED && pointer_id_is_active) {
-    // Ignore touch press events if we already believe the pointer is down.
-    return false;
-  } else if (event.type() != ET_TOUCH_PRESSED && !pointer_id_is_active) {
-    // We could have an active touch stream transfered to us, resulting in touch
-    // move or touch up events without associated touch down events. Ignore
-    // them.
-    return false;
-  }
-
-  // If this is a touchmove event, and it isn't different from the last
-  // event, ignore it.
-  if (event.type() == ET_TOUCH_MOVED &&
-      event.x() == pointer_state_.GetX(index) &&
-      event.y() == pointer_state_.GetY(index)) {
-    return false;
-  }
-
-  last_touch_event_latency_info_ = *event.latency();
-  pointer_state_.OnTouch(event);
-
-  bool result = filtered_gesture_provider_.OnTouchEvent(pointer_state_);
-  pointer_state_.CleanupRemovedTouchPoints(event);
-  return result;
-}
-
-void GestureProviderAura::OnTouchEventAck(bool event_consumed) {
-  DCHECK(pending_gestures_.empty());
-  DCHECK(!handling_event_);
-  base::AutoReset<bool> handling_event(&handling_event_, true);
-  filtered_gesture_provider_.OnTouchEventAck(event_consumed);
-  last_touch_event_latency_info_.Clear();
-}
-
-void GestureProviderAura::OnGestureEvent(
-    const GestureEventData& gesture) {
-  GestureEventDetails details = gesture.details;
-  details.set_oldest_touch_id(gesture.motion_event_id);
-
-  if (gesture.type() == ET_GESTURE_TAP) {
-    int tap_count = 1;
-    if (previous_tap_ && IsConsideredDoubleTap(*previous_tap_, gesture))
-      tap_count = 1 + (previous_tap_->details.tap_count() % 3);
-    details.set_tap_count(tap_count);
-    if (!previous_tap_)
-      previous_tap_.reset(new GestureEventData(gesture));
-    else
-      *previous_tap_ = gesture;
-    previous_tap_->details = details;
-  } else if (gesture.type() == ET_GESTURE_TAP_CANCEL) {
-    previous_tap_.reset();
-  }
-
-  scoped_ptr<ui::GestureEvent> event(
-      new ui::GestureEvent(gesture.x,
-                           gesture.y,
-                           gesture.flags,
-                           gesture.time - base::TimeTicks(),
-                           details));
-
-  ui::LatencyInfo* gesture_latency = event->latency();
-
-  gesture_latency->CopyLatencyFrom(
-      last_touch_event_latency_info_,
-      ui::INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT);
-  gesture_latency->CopyLatencyFrom(
-      last_touch_event_latency_info_,
-      ui::INPUT_EVENT_LATENCY_UI_COMPONENT);
-  gesture_latency->CopyLatencyFrom(
-      last_touch_event_latency_info_,
-      ui::INPUT_EVENT_LATENCY_ACKED_TOUCH_COMPONENT);
-
-  if (!handling_event_) {
-    // Dispatching event caused by timer.
-    client_->OnGestureEvent(event.get());
-  } else {
-    // Memory managed by ScopedVector pending_gestures_.
-    pending_gestures_.push_back(event.release());
-  }
-}
-
-ScopedVector<GestureEvent>* GestureProviderAura::GetAndResetPendingGestures() {
-  if (pending_gestures_.empty())
-    return NULL;
-  // Caller is responsible for deleting old_pending_gestures.
-  ScopedVector<GestureEvent>* old_pending_gestures =
-      new ScopedVector<GestureEvent>();
-  old_pending_gestures->swap(pending_gestures_);
-  return old_pending_gestures;
-}
-
-bool GestureProviderAura::IsConsideredDoubleTap(
-    const GestureEventData& previous_tap,
-    const GestureEventData& current_tap) const {
-  if (current_tap.time - previous_tap.time >
-      base::TimeDelta::FromMilliseconds(
-          ui::GestureConfiguration::max_time_between_double_click_in_ms())) {
-    return false;
-  }
-
-  float double_tap_slop_square =
-      GestureConfiguration::max_distance_between_taps_for_double_tap();
-  double_tap_slop_square *= double_tap_slop_square;
-  const float delta_x = previous_tap.x - current_tap.x;
-  const float delta_y = previous_tap.y - current_tap.y;
-  return (delta_x * delta_x + delta_y * delta_y < double_tap_slop_square);
-}
-
-}  // namespace content