blob: 407b830aad9252817a8297b435279078a856f7c5 (
plain)
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
81
82
|
// Copyright (c) 2011 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 VIEWS_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_THUMB_H_
#define VIEWS_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_THUMB_H_
#pragma once
#include "ui/gfx/size.h"
#include "views/controls/button/custom_button.h"
#include "views/controls/scrollbar/scroll_bar.h"
#include "views/view.h"
namespace gfx {
class Canvas;
}
namespace views {
class BaseScrollBar;
///////////////////////////////////////////////////////////////////////////////
//
// BaseScrollBarThumb
//
// A view that acts as the thumb in the scroll bar track that the user can
// drag to scroll the associated contents view within the viewport.
//
///////////////////////////////////////////////////////////////////////////////
class VIEWS_EXPORT BaseScrollBarThumb : public View {
public:
explicit BaseScrollBarThumb(BaseScrollBar* scroll_bar);
virtual ~BaseScrollBarThumb();
// Sets the size (width or height) of the thumb to the specified value.
void SetSize(int size);
// Retrieves the size (width or height) of the thumb.
int GetSize() const;
// Sets the position of the thumb on the x or y axis.
void SetPosition(int position);
// Gets the position of the thumb on the x or y axis.
int GetPosition() const;
// View overrides:
virtual gfx::Size GetPreferredSize() OVERRIDE = 0;
protected:
// View overrides:
virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE = 0;
virtual void OnMouseEntered(const MouseEvent& event) OVERRIDE;
virtual void OnMouseExited(const MouseEvent& event) OVERRIDE;
virtual bool OnMousePressed(const MouseEvent& event) OVERRIDE;
virtual bool OnMouseDragged(const MouseEvent& event) OVERRIDE;
virtual void OnMouseReleased(const MouseEvent& event) OVERRIDE;
virtual void OnMouseCaptureLost() OVERRIDE;
CustomButton::ButtonState GetState() const;
// Update our state and schedule a repaint when the mouse moves over us.
void SetState(CustomButton::ButtonState state);
private:
// The BaseScrollBar that owns us.
BaseScrollBar* scroll_bar_;
int drag_start_position_;
// The position of the mouse on the scroll axis relative to the top of this
// View when the drag started.
int mouse_offset_;
// The current state of the thumb button.
CustomButton::ButtonState state_;
DISALLOW_COPY_AND_ASSIGN(BaseScrollBarThumb);
};
} // namespace views
#endif // VIEWS_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_THUMB_H_
|
