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 <utility>

#include "base/auto_reset.h"
#include "base/logging.h"
#include "ui/events/event.h"
#include "ui/events/gesture_detection/gesture_configuration.h"
#include "ui/events/gesture_detection/gesture_event_data.h"
#include "ui/events/gesture_detection/gesture_provider_config_helper.h"

namespace ui {

GestureProviderAura::GestureProviderAura(GestureConsumer* consumer,
                                         GestureProviderAuraClient* client)
    : client_(client),
      filtered_gesture_provider_(
          GetGestureProviderConfig(GestureProviderConfigType::CURRENT_PLATFORM),
          this),
      handling_event_(false),
      gesture_consumer_(consumer) {
  filtered_gesture_provider_.SetDoubleTapSupportForPlatformEnabled(false);
}

GestureProviderAura::~GestureProviderAura() {}

bool GestureProviderAura::OnTouchEvent(TouchEvent* event) {
  if (!pointer_state_.OnTouch(*event))
    return false;

  auto result = filtered_gesture_provider_.OnTouchEvent(pointer_state_);
  if (!result.succeeded)
    return false;

  event->set_may_cause_scrolling(result.moved_beyond_slop_region);
  pointer_state_.CleanupRemovedTouchPoints(*event);
  return true;
}

void GestureProviderAura::OnTouchEventAck(uint32_t unique_event_id,
                                          bool event_consumed) {
  DCHECK(pending_gestures_.empty());
  DCHECK(!handling_event_);
  base::AutoReset<bool> handling_event(&handling_event_, true);
  filtered_gesture_provider_.OnTouchEventAck(unique_event_id, event_consumed);
}

void GestureProviderAura::OnGestureEvent(
    const GestureEventData& gesture) {
  scoped_ptr<ui::GestureEvent> event(
      new ui::GestureEvent(gesture.x, gesture.y, gesture.flags,
                           gesture.time - base::TimeTicks(), gesture.details));

  if (!handling_event_) {
    // Dispatching event caused by timer.
    client_->OnGestureEvent(gesture_consumer_, event.get());
  } else {
    // Memory managed by ScopedVector pending_gestures_.
    pending_gestures_.push_back(std::move(event));
  }
}

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;
}

}  // namespace content