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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_SEQUENCE_H_
#define UI_AURA_GESTURES_GESTURE_SEQUENCE_H_
#pragma once
#include "ui/aura/gestures/gesture_point.h"
#include "ui/aura/gestures/gesture_recognizer.h"
#include "ui/base/events.h"
namespace aura {
class TouchEvent;
class GestureEvent;
// Gesture state.
enum GestureState {
GS_NO_GESTURE,
GS_PENDING_SYNTHETIC_CLICK,
GS_SCROLL,
GS_PINCH,
};
// A GestureSequence recognizes gestures from touch sequences.
class GestureSequence {
public:
GestureSequence();
virtual ~GestureSequence();
typedef GestureRecognizer::Gestures Gestures;
// Invoked for each touch event that could contribute to the current gesture.
// Returns list of zero or more GestureEvents identified after processing
// TouchEvent.
// Caller would be responsible for freeing up Gestures.
virtual Gestures* ProcessTouchEventForGesture(const TouchEvent& event,
ui::TouchStatus status);
private:
void Reset();
GesturePoint& GesturePointForEvent(const TouchEvent& event);
// Functions to be called to add GestureEvents, after succesful recognition.
// Tap gestures.
void AppendTapDownGestureEvent(const GesturePoint& point, Gestures* gestures);
void AppendClickGestureEvent(const GesturePoint& point, Gestures* gestures);
void AppendDoubleClickGestureEvent(const GesturePoint& point,
Gestures* gestures);
// Scroll gestures.
void AppendScrollGestureBegin(const GesturePoint& point,
const gfx::Point& location,
Gestures* gestures);
void AppendScrollGestureEnd(const GesturePoint& point,
const gfx::Point& location,
Gestures* gestures,
float x_velocity,
float y_velocity);
void AppendScrollGestureUpdate(const GesturePoint& point,
const gfx::Point& location,
Gestures* gestures);
// Pinch gestures.
void AppendPinchGestureBegin(const GesturePoint& p1,
const GesturePoint& p2,
Gestures* gestures);
void AppendPinchGestureEnd(const GesturePoint& p1,
const GesturePoint& p2,
float scale,
Gestures* gestures);
void AppendPinchGestureUpdate(const GesturePoint& p1,
const GesturePoint& p2,
float scale,
Gestures* gestures);
void set_state(const GestureState state ) { state_ = state; }
// Various GestureTransitionFunctions for a signature.
// There is, 1:many mapping from GestureTransitionFunction to Signature
// But a Signature have only one GestureTransitionFunction.
bool Click(const TouchEvent& event,
const GesturePoint& point,
Gestures* gestures);
bool InClickOrScroll(const TouchEvent& event,
const GesturePoint& point,
Gestures* gestures);
bool InScroll(const TouchEvent& event,
const GesturePoint& point,
Gestures* gestures);
bool NoGesture(const TouchEvent& event,
const GesturePoint& point,
Gestures* gestures);
bool TouchDown(const TouchEvent& event,
const GesturePoint& point,
Gestures* gestures);
bool ScrollEnd(const TouchEvent& event,
GesturePoint& point,
Gestures* gestures);
bool PinchStart(const TouchEvent& event,
const GesturePoint& point,
Gestures* gestures);
bool PinchUpdate(const TouchEvent& event,
const GesturePoint& point,
Gestures* gestures);
bool PinchEnd(const TouchEvent& event,
const GesturePoint& point,
Gestures* gestures);
// Current state of gesture recognizer.
GestureState state_;
// ui::EventFlags.
int flags_;
// The distance between the two points at PINCH_START.
float pinch_distance_start_;
// This distance is updated after each PINCH_UPDATE.
float pinch_distance_current_;
// Maximum points in a single gesture.
static const int kMaxGesturePoints = 12;
GesturePoint points_[kMaxGesturePoints];
int point_count_;
DISALLOW_COPY_AND_ASSIGN(GestureSequence);
};
} // namespace aura
#endif // UI_AURA_GESTURES_GESTURE_SEQUENCE_H_
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