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// Copyright 2018 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 CHROMECAST_GRAPHICS_GESTURES_MULTIPLE_TAP_DETECTOR_H_
#define CHROMECAST_GRAPHICS_GESTURES_MULTIPLE_TAP_DETECTOR_H_
#include <deque>
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/timer/timer.h"
#include "base/values.h"
#include "ui/events/event.h"
#include "ui/events/event_rewriter.h"
#include "ui/events/gesture_detection/gesture_detector.h"
#include "ui/events/gestures/gesture_provider_aura.h"
#include "ui/gfx/geometry/point.h"
namespace aura {
class Window;
}
namespace ui {
class Event;
class TouchEvent;
} // namespace ui
namespace chromecast {
class MultipleTapDetectorDelegate {
public:
virtual ~MultipleTapDetectorDelegate() = default;
virtual void OnTripleTap(const gfx::Point& touch_location) = 0;
virtual void OnDoubleTap(const gfx::Point& touch_location) {}
};
enum class MultiTapState {
NONE,
TOUCH,
INTERVAL_WAIT,
};
// An event rewriter responsible for detecting triple-tap or double-tap events
// on the root window.
class MultipleTapDetector : public ui::EventRewriter {
public:
MultipleTapDetector(aura::Window* root_window,
MultipleTapDetectorDelegate* delegate);
~MultipleTapDetector() override;
void set_enabled(bool enabled) { enabled_ = enabled; }
bool enabled() const { return enabled_; }
// Overridden from ui::EventRewriter
ui::EventDispatchDetails RewriteEvent(
const ui::Event& event,
const Continuation continuation) override;
private:
friend class MultipleTapDetectorTest;
// Expiration event for maximum time between taps in a tap.
void OnTapIntervalTimerFired();
// Expiration event for a finger that is pressed too long during a multi tap.
void OnLongPressIntervalTimerFired();
void TapDetectorStateReset();
void DispatchEvent(ui::TouchEvent* event);
// A default gesture detector config, so we can share the same
// timeout and pixel slop constants.
ui::GestureDetector::Config gesture_detector_config_;
aura::Window* root_window_;
MultipleTapDetectorDelegate* delegate_;
bool enabled_;
MultiTapState tap_state_;
int tap_count_;
gfx::Point last_tap_location_;
base::OneShotTimer triple_tap_timer_;
class Stash {
public:
Stash(const ui::TouchEvent& e, const Continuation c);
~Stash();
const ui::TouchEvent event;
const Continuation continuation;
};
std::deque<Stash> stashed_events_;
DISALLOW_COPY_AND_ASSIGN(MultipleTapDetector);
};
} // namespace chromecast
#endif // CHROMECAST_GRAPHICS_GESTURES_MULTIPLE_TAP_DETECTOR_H_