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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_AURA_GESTURES_GESTURE_POINT_H_
#define UI_AURA_GESTURES_GESTURE_POINT_H_
#pragma once
#include "base/basictypes.h"
#include "ui/gfx/point.h"
namespace aura {
class TouchEvent;
// Gesture state.
enum GestureState {
GS_NO_GESTURE,
GS_PENDING_SYNTHETIC_CLICK,
GS_SCROLL,
};
// A GesturePoint represents a single touch-point/finger during a gesture
// recognition process.
class GesturePoint {
public:
GesturePoint();
virtual ~GesturePoint() {}
// Resets various states.
void Reset();
// Updates some states when a Tap gesture has been recognized for this point.
void UpdateForTap();
// Updates some states when a Scroll gesture has been recognized for this
// point.
void UpdateForScroll();
// Updates states depending on the event and the gesture-state.
void UpdateValues(const TouchEvent& event, GestureState state);
// Responds according to the state of the gesture point (i.e. the point can
// represent a click or scroll etc.)
bool IsInClickWindow(const TouchEvent& event) const;
bool IsInDoubleClickWindow(const TouchEvent& event) const;
bool IsInScrollWindow(const TouchEvent& event) const;
bool IsInFlickWindow(const TouchEvent& event) const;
bool DidScroll(const TouchEvent& event) const;
const gfx::Point& first_touch_position() const {
return first_touch_position_;
}
double last_touch_time() const { return last_touch_time_; }
const gfx::Point& last_touch_position() const { return last_touch_position_; }
double x_delta() const {
return last_touch_position_.x() - first_touch_position_.x();
}
double y_delta() const {
return last_touch_position_.y() - first_touch_position_.y();
}
float x_velocity() const { return x_velocity_; }
float y_velocity() const { return y_velocity_; }
private:
// Various statistical functions to manipulate gestures.
bool IsInClickTimeWindow() const;
bool IsInSecondClickTimeWindow() const;
bool IsInsideManhattanSquare(const TouchEvent& event) const;
bool IsSecondClickInsideManhattanSquare(const TouchEvent& event) const;
bool IsOverMinFlickSpeed() const;
gfx::Point first_touch_position_;
double first_touch_time_;
gfx::Point last_touch_position_;
double last_touch_time_;
double last_tap_time_;
gfx::Point last_tap_position_;
float x_velocity_;
float y_velocity_;
DISALLOW_COPY_AND_ASSIGN(GesturePoint);
};
} // namespace aura
#endif // UI_AURA_GESTURES_GESTURE_POINT_H_
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