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// Copyright (c) 2012 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.
#ifndef UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_IMPL_H_
#define UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_IMPL_H_
#include <stdint.h>
#include <map>
#include <memory>
#include <vector>
#include "base/macros.h"
#include "ui/events/event_constants.h"
#include "ui/events/events_export.h"
#include "ui/events/gestures/gesture_provider_aura.h"
#include "ui/events/gestures/gesture_recognizer.h"
#include "ui/events/types/event_type.h"
#include "ui/gfx/geometry/point.h"
namespace ui {
class GestureConsumer;
class GestureEvent;
class GestureEventHelper;
class TouchEvent;
// TODO(tdresser): Once the unified gesture recognition process sticks
// (crbug.com/332418), GestureRecognizerImpl can be cleaned up
// significantly.
class EVENTS_EXPORT GestureRecognizerImpl : public GestureRecognizer,
public GestureProviderAuraClient {
public:
typedef std::map<int, GestureConsumer*> TouchIdToConsumerMap;
GestureRecognizerImpl();
~GestureRecognizerImpl() override;
std::vector<GestureEventHelper*>& helpers() { return helpers_; }
// Returns a list of events of type |type|, one for each pointer down on
// |consumer|. Event locations are pulled from the active pointers.
std::vector<std::unique_ptr<TouchEvent>> GetEventPerPointForConsumer(
GestureConsumer* consumer,
EventType type);
// Overridden from GestureRecognizer
GestureConsumer* GetTouchLockedTarget(const TouchEvent& event) override;
GestureConsumer* GetTargetForLocation(const gfx::PointF& location,
int source_device_id) override;
void CancelActiveTouchesExcept(GestureConsumer* not_cancelled) override;
void CancelActiveTouchesOn(
const std::vector<GestureConsumer*>& consumers) override;
void TransferEventsTo(
GestureConsumer* current_consumer,
GestureConsumer* new_consumer,
TransferTouchesBehavior transfer_touches_behavior) override;
std::vector<std::unique_ptr<ui::TouchEvent>> ExtractTouches(
GestureConsumer* consumer) override;
void TransferTouches(GestureConsumer* consumer,
const std::vector<std::unique_ptr<ui::TouchEvent>>&
touch_events) override;
bool GetLastTouchPointForTarget(GestureConsumer* consumer,
gfx::PointF* point) override;
bool CancelActiveTouches(GestureConsumer* consumer) override;
protected:
virtual GestureProviderAura* GetGestureProviderForConsumer(
GestureConsumer* c);
// Overridden from GestureRecognizer
bool ProcessTouchEventPreDispatch(TouchEvent* event,
GestureConsumer* consumer) override;
private:
// Sets up the target consumer for gestures based on the touch-event.
void SetupTargets(const TouchEvent& event, GestureConsumer* consumer);
void DispatchGestureEvent(GestureConsumer* raw_input_consumer,
GestureEvent* event);
Gestures AckTouchEvent(uint32_t unique_event_id,
ui::EventResult result,
bool is_source_touch_event_set_blocking,
GestureConsumer* consumer) override;
void CancelActiveTouchesExceptImpl(GestureConsumer* not_cancelled);
bool CancelActiveTouchesImpl(GestureConsumer* consumer);
bool CleanupStateForConsumer(GestureConsumer* consumer) override;
void AddGestureEventHelper(GestureEventHelper* helper) override;
void RemoveGestureEventHelper(GestureEventHelper* helper) override;
bool DoesConsumerHaveActiveTouch(GestureConsumer* consumer) const override;
void SendSynthesizedEndEvents(GestureConsumer* consumer) override;
// Overridden from GestureProviderAuraClient
void OnGestureEvent(GestureConsumer* raw_input_consumer,
GestureEvent* event) override;
// Convenience method to find the GestureEventHelper that can dispatch events
// to a specific |consumer|.
GestureEventHelper* FindDispatchHelperForConsumer(GestureConsumer* consumer);
std::map<GestureConsumer*, std::unique_ptr<GestureProviderAura>>
consumer_gesture_provider_;
// Maps an event via its |unique_event_id| to the corresponding gesture
// provider. This avoids any invalid reference while routing ACKs for events
// that may arise post |TransferEventsTo()| function call.
// See http://crbug.com/698843 for more info.
std::map<uint32_t, GestureProviderAura*> event_to_gesture_provider_;
// |touch_id_target_| maps a touch-id to its target window.
// touch-ids are removed from |touch_id_target_| on
// ET_TOUCH_RELEASE and ET_TOUCH_CANCEL.
TouchIdToConsumerMap touch_id_target_;
std::vector<GestureEventHelper*> helpers_;
DISALLOW_COPY_AND_ASSIGN(GestureRecognizerImpl);
};
} // namespace ui
#endif // UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_IMPL_H_
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