1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_TOUCH_SELECTION_LONGPRESS_DRAG_SELECTOR_H_
#define UI_TOUCH_SELECTION_LONGPRESS_DRAG_SELECTOR_H_
#include "base/memory/raw_ptr.h"
#include "base/time/time.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/geometry/vector2d_f.h"
#include "ui/touch_selection/touch_selection_draggable.h"
#include "ui/touch_selection/ui_touch_selection_export.h"
namespace ui {
class MotionEvent;
class UI_TOUCH_SELECTION_EXPORT LongPressDragSelectorClient
: public TouchSelectionDraggableClient {
public:
~LongPressDragSelectorClient() override {}
virtual void OnLongPressDragActiveStateChanged() = 0;
virtual gfx::PointF GetSelectionStart() const = 0;
virtual gfx::PointF GetSelectionEnd() const = 0;
};
// Supports text selection via touch dragging after a longpress- or
// doublepress-initiated selection.
class UI_TOUCH_SELECTION_EXPORT LongPressDragSelector
: public TouchSelectionDraggable {
public:
explicit LongPressDragSelector(LongPressDragSelectorClient* client);
~LongPressDragSelector() override;
// TouchSelectionDraggable implementation.
bool WillHandleTouchEvent(const MotionEvent& event) override;
bool IsActive() const override;
// Called just prior to a longpress event being handled.
void OnLongPressEvent(base::TimeTicks event_time,
const gfx::PointF& position);
// Called just prior to a double press event being handled.
void OnDoublePressEvent(base::TimeTicks event_time,
const gfx::PointF& position);
// Called when a scroll is going to happen to cancel longpress-drag gesture.
void OnScrollBeginEvent();
// Called when the active selection changes.
void OnSelectionActivated();
void OnSelectionDeactivated();
private:
enum SelectionState {
INACTIVE,
INITIATING_GESTURE_PENDING,
SELECTION_PENDING,
DRAG_PENDING,
DRAGGING
};
void SetState(SelectionState state);
const raw_ptr<LongPressDragSelectorClient> client_;
SelectionState state_;
base::TimeTicks touch_down_time_;
gfx::PointF touch_down_position_;
gfx::Vector2dF longpress_drag_selection_offset_;
gfx::PointF longpress_drag_start_anchor_;
bool has_longpress_drag_start_anchor_;
};
} // namespace ui
#endif // UI_TOUCH_SELECTION_LONGPRESS_DRAG_SELECTOR_H_
|
