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
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
// Copyright (c) 2006-2008 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.
#include "views/controls/button/button_dropdown.h"
#include "app/l10n_util.h"
#include "base/message_loop.h"
#include "grit/generated_resources.h"
#include "views/controls/menu/view_menu_delegate.h"
#include "views/widget/widget.h"
namespace views {
// How long to wait before showing the menu
static const int kMenuTimerDelay = 500;
////////////////////////////////////////////////////////////////////////////////
//
// ButtonDropDown - constructors, destructors, initialization, cleanup
//
////////////////////////////////////////////////////////////////////////////////
ButtonDropDown::ButtonDropDown(ButtonListener* listener,
Menu::Delegate* menu_delegate)
: ImageButton(listener),
menu_delegate_(menu_delegate),
y_position_on_lbuttondown_(0),
show_menu_factory_(this) {
}
ButtonDropDown::~ButtonDropDown() {
}
////////////////////////////////////////////////////////////////////////////////
//
// ButtonDropDown - Events
//
////////////////////////////////////////////////////////////////////////////////
bool ButtonDropDown::OnMousePressed(const MouseEvent& e) {
if (IsEnabled() && e.IsLeftMouseButton() && HitTest(e.location())) {
// Store the y pos of the mouse coordinates so we can use them later to
// determine if the user dragged the mouse down (which should pop up the
// drag down menu immediately, instead of waiting for the timer)
y_position_on_lbuttondown_ = e.y();
// Schedule a task that will show the menu.
MessageLoop::current()->PostDelayedTask(FROM_HERE,
show_menu_factory_.NewRunnableMethod(&ButtonDropDown::ShowDropDownMenu,
GetWidget()->GetNativeView()),
kMenuTimerDelay);
}
return ImageButton::OnMousePressed(e);
}
void ButtonDropDown::OnMouseReleased(const MouseEvent& e, bool canceled) {
ImageButton::OnMouseReleased(e, canceled);
if (canceled)
return;
if (e.IsLeftMouseButton())
show_menu_factory_.RevokeAll();
if (IsEnabled() && e.IsRightMouseButton() && HitTest(e.location())) {
show_menu_factory_.RevokeAll();
// Make the button look depressed while the menu is open.
// NOTE: SetState() schedules a paint, but it won't occur until after the
// context menu message loop has terminated, so we PaintNow() to
// update the appearance synchronously.
SetState(BS_PUSHED);
PaintNow();
ShowDropDownMenu(GetWidget()->GetNativeView());
}
}
bool ButtonDropDown::OnMouseDragged(const MouseEvent& e) {
bool result = ImageButton::OnMouseDragged(e);
if (!show_menu_factory_.empty()) {
// SM_CYDRAG is a pixel value for minimum dragging distance before operation
// counts as a drag, and not just as a click and accidental move of a mouse.
// See http://msdn2.microsoft.com/en-us/library/ms724385.aspx for details.
int dragging_threshold = GetSystemMetrics(SM_CYDRAG);
// If the mouse is dragged to a y position lower than where it was when
// clicked then we should not wait for the menu to appear but show
// it immediately.
if (e.y() > y_position_on_lbuttondown_ + dragging_threshold) {
show_menu_factory_.RevokeAll();
ShowDropDownMenu(GetWidget()->GetNativeView());
}
}
return result;
}
////////////////////////////////////////////////////////////////////////////////
//
// ButtonDropDown - Menu functions
//
////////////////////////////////////////////////////////////////////////////////
void ButtonDropDown::ShowContextMenu(int x, int y, bool is_mouse_gesture) {
show_menu_factory_.RevokeAll();
// Make the button look depressed while the menu is open.
// NOTE: SetState() schedules a paint, but it won't occur until after the
// context menu message loop has terminated, so we PaintNow() to
// update the appearance synchronously.
SetState(BS_PUSHED);
PaintNow();
ShowDropDownMenu(GetWidget()->GetNativeView());
SetState(BS_HOT);
}
void ButtonDropDown::ShowDropDownMenu(HWND window) {
if (menu_delegate_) {
gfx::Rect lb = GetLocalBounds(true);
// Both the menu position and the menu anchor type change if the UI layout
// is right-to-left.
gfx::Point menu_position(lb.origin());
menu_position.Offset(0, lb.height() - 1);
if (UILayoutIsRightToLeft())
menu_position.Offset(lb.width() - 1, 0);
Menu::AnchorPoint anchor = Menu::TOPLEFT;
if (UILayoutIsRightToLeft())
anchor = Menu::TOPRIGHT;
View::ConvertPointToScreen(this, &menu_position);
int left_bound = GetSystemMetrics(SM_XVIRTUALSCREEN);
if (menu_position.x() < left_bound)
menu_position.set_x(left_bound);
Menu menu(menu_delegate_, anchor, window);
// ID's for AppendMenu is 1-based because RunMenu will ignore the user
// selection if id=0 is selected (0 = NO-OP) so we add 1 here and subtract 1
// in the handlers above to get the actual index
int item_count = menu_delegate_->GetItemCount();
for (int i = 0; i < item_count; i++) {
if (menu_delegate_->IsItemSeparator(i + 1)) {
menu.AppendSeparator();
} else {
if (menu_delegate_->HasIcon(i + 1))
menu.AppendMenuItemWithIcon(i + 1, L"", SkBitmap());
else
menu.AppendMenuItem(i+1, L"", Menu::NORMAL);
}
}
menu.RunMenuAt(menu_position.x(), menu_position.y());
// Need to explicitly clear mouse handler so that events get sent
// properly after the menu finishes running. If we don't do this, then
// the first click to other parts of the UI is eaten.
SetMouseHandler(NULL);
}
}
////////////////////////////////////////////////////////////////////////////////
//
// ButtonDropDown - Accessibility
//
////////////////////////////////////////////////////////////////////////////////
bool ButtonDropDown::GetAccessibleDefaultAction(std::wstring* action) {
DCHECK(action);
action->assign(l10n_util::GetString(IDS_ACCACTION_PRESS));
return true;
}
bool ButtonDropDown::GetAccessibleRole(AccessibilityTypes::Role* role) {
DCHECK(role);
*role = AccessibilityTypes::ROLE_BUTTONDROPDOWN;
return true;
}
bool ButtonDropDown::GetAccessibleState(AccessibilityTypes::State* state) {
DCHECK(state);
*state = AccessibilityTypes::STATE_HASPOPUP;
return true;
}
} // namespace views
|
