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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
namespace gfx {
class Point;
} // namespace gfx
namespace chromecast {
enum class CastSideSwipeOrigin { TOP, BOTTOM, LEFT, RIGHT, NONE };
enum class CastSideSwipeEvent {
// Indicates the beginning of a side-swipe event (finger down).
// Indicates the continuance of a side-swipe event (finger drag).
// Indicates the end of a side-swipe event (finger up).
// Interface for handlers triggered on reception of gestures on the
// root window, including side-swipe and tap.
class CastGestureHandler {
// Gesture handler priority. If multiple handlers can process a gesture event,
// then the highest-priority handler is the one which receives the event.
enum class Priority {
// Handler with NONE priority will never receive a gesture event.
NONE = 0,
CastGestureHandler() = default;
CastGestureHandler(const CastGestureHandler&) = delete;
CastGestureHandler& operator=(const CastGestureHandler&) = delete;
virtual ~CastGestureHandler() = default;
// Returns the gesture handler's current priority.
virtual Priority GetPriority() = 0;
// Return true if this handler can handle swipes from the given origin.
virtual bool CanHandleSwipe(CastSideSwipeOrigin swipe_origin) = 0;
// Triggered when a user swipes from an edge on the screen.
virtual void HandleSideSwipe(CastSideSwipeEvent event,
CastSideSwipeOrigin swipe_origin,
const gfx::Point& touch_location) = 0;
// Triggered on the completion of a tap down event, fired when the
// finger is pressed.
virtual void HandleTapDownGesture(const gfx::Point& touch_location) = 0;
// Triggered on the completion of a tap event, fire after a press
// followed by a release, within the tap timeout window
virtual void HandleTapGesture(const gfx::Point& touch_location) = 0;
} // namespace chromecast