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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_SIDE_SWIPE_DETECTOR_H_
#define CHROMECAST_GRAPHICS_GESTURES_SIDE_SWIPE_DETECTOR_H_
#include <deque>
#include "base/timer/elapsed_timer.h"
#include "chromecast/graphics/gestures/cast_gesture_handler.h"
#include "ui/events/event_rewriter.h"
namespace aura {
class Window;
} // namespace aura
namespace chromecast {
// An event rewriter for detecting system-wide gestures performed on the margins
// of the root window.
// Recognizes swipe gestures that originate from the top, left, bottom, and
// right of the root window. Stashes copies of touch events that occur during
// the side swipe, and replays them if the finger releases before leaving the
// margin area.
class SideSwipeDetector : public ui::EventRewriter {
public:
SideSwipeDetector(CastGestureHandler* gesture_handler,
aura::Window* root_window);
~SideSwipeDetector() override;
CastSideSwipeOrigin GetDragPosition(const gfx::Point& point,
const gfx::Rect& screen_bounds) const;
// Overridden from ui::EventRewriter
ui::EventDispatchDetails RewriteEvent(
const ui::Event& event,
const Continuation continuation) override;
private:
void StashEvent(const ui::TouchEvent& event);
const int gesture_start_width_;
const int gesture_start_height_;
const int bottom_gesture_start_height_;
CastGestureHandler* gesture_handler_;
aura::Window* root_window_;
CastSideSwipeOrigin current_swipe_;
ui::PointerId current_pointer_id_;
base::ElapsedTimer current_swipe_time_;
std::deque<ui::TouchEvent> stashed_events_;
DISALLOW_COPY_AND_ASSIGN(SideSwipeDetector);
};
} // namespace chromecast
#endif // CHROMECAST_GRAPHICS_GESTURES_SIDE_SWIPE_DETECTOR_H_