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
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt3Support module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "q3whatsthis.h"
#ifndef QT_NO_WHATSTHIS
#include "qapplication.h"
#include "qwidget.h"
#include "qevent.h"
QT_BEGIN_NAMESPACE
/*! \class Q3WhatsThis
\compat
*/
/*!
Constructs a new "What's This?" object for \a widget.
*/
Q3WhatsThis::Q3WhatsThis(QWidget *widget)
: QObject(widget)
{
if (widget)
widget->installEventFilter(this);
}
/*!
Destroys the "What's This?" object.
*/
Q3WhatsThis::~Q3WhatsThis()
{
}
/*!
\internal
Handles "What's This?" events.
*/
bool Q3WhatsThis::eventFilter(QObject *o, QEvent *e)
{
if (o != parent() || !o->isWidgetType())
return false;
if (e->type() == QEvent::WhatsThis) {
QString s = text(static_cast<QHelpEvent*>(e)->pos());
if (!s.isEmpty())
QWhatsThis::showText(static_cast<QHelpEvent*>(e)->globalPos(), s, static_cast<QWidget*>(o));
} else if (e->type() == QEvent::QueryWhatsThis) {
QString s = text(static_cast<QHelpEvent*>(e)->pos());
if (s.isEmpty())
return false;
} else if (e->type() == QEvent::WhatsThisClicked) {
QString href = static_cast<QWhatsThisClickedEvent*>(e)->href();
if (clicked(href))
QWhatsThis::hideText();
} else {
return false;
}
return true;
}
/*!
This virtual function returns the text for position \a pos in the
widget that this "What's This?" object documents. If there is no
"What's This?" text for the position, an empty string is returned.
The default implementation returns an empty string.
*/
QString Q3WhatsThis::text(const QPoint & /* pos */)
{
if (parent() && parent()->isWidgetType())
return static_cast<QWidget*>(parent())->whatsThis();
return QString();
}
/*!
This virtual function is called when the user clicks inside the
"What's this?" window. \a href is the link the user clicked on, or
an empty string if there was no link.
If the function returns true (the default), the "What's this?"
window is closed, otherwise it remains visible.
The default implementation ignores \a href and returns true.
*/
bool Q3WhatsThis::clicked(const QString & /* href */)
{
return true;
}
/*!
\fn void Q3WhatsThis::enterWhatsThisMode()
Enters "What's This?" mode and returns immediately.
Qt will install a special cursor and take over mouse input until
the user clicks somewhere. It then shows any help available and
ends "What's This?" mode. Finally, Qt removes the special cursor
and help window and then restores ordinary event processing, at
which point the left mouse button is no longer pressed.
The user can also use the Esc key to leave "What's This?" mode.
\sa inWhatsThisMode(), leaveWhatsThisMode()
*/
/*!
\fn bool Q3WhatsThis::inWhatsThisMode()
Returns true if the application is in "What's This?" mode;
otherwise returns false.
\sa enterWhatsThisMode(), leaveWhatsThisMode()
*/
/*!
\fn void Q3WhatsThis::add(QWidget *widget, const QString &text)
Adds \a text as "What's This?" help for \a widget. If the text is
rich text formatted (i.e. it contains markup) it will be rendered
with the default stylesheet QStyleSheet::defaultSheet().
The text is destroyed if the widget is later destroyed, so it need
not be explicitly removed.
\sa remove()
*/
/*!
\fn void Q3WhatsThis::remove(QWidget *widget)
Removes the "What's This?" help associated with the \a widget.
This happens automatically if the widget is destroyed.
\sa add()
*/
/*!
\fn void Q3WhatsThis::leaveWhatsThisMode(const QString& text = QString(), const QPoint& pos = QCursor::pos(), QWidget* widget = 0)
This function is used internally by widgets that support
QWidget::customWhatsThis(); applications do not usually call it.
An example of such a widget is Q3PopupMenu: menus still work
normally in "What's This?" mode but also provide help texts for
individual menu items.
If \a text is not empty, a "What's This?" help window is
displayed at the global screen position \a pos. If widget \a widget is
not 0 and has its own dedicated QWhatsThis object, this object
will receive clicked() messages when the user clicks on hyperlinks
inside the help text.
\sa inWhatsThisMode(), enterWhatsThisMode(), clicked()
*/
/*!
\fn void Q3WhatsThis::display(const QString &text, const QPoint &pos, QWidget *widget)
Display \a text in a help window at the global screen position \a
pos.
If widget \a widget is not 0 and has its own dedicated QWhatsThis
object, this object will receive clicked() messages when the user
clicks on hyperlinks inside the help text.
\sa clicked()
*/
/*!
Creates a QToolButton preconfigured to enter "What's This?" mode
when clicked. You will often use this with a tool bar as \a
parent:
\snippet doc/src/snippets/code/src_qt3support_widgets_q3whatsthis.cpp 0
*/
QToolButton *Q3WhatsThis::whatsThisButton(QWidget * parent)
{
return QWhatsThis::whatsThisButton(parent);
}
QT_END_NAMESPACE
#endif // QT_NO_WHATSTHIS
|
