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
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
|
/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui 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 "qsplashscreen.h"
#ifndef QT_NO_SPLASHSCREEN
#include "qapplication.h"
#include "qdesktopwidget.h"
#include "qpainter.h"
#include "qpixmap.h"
#include "qtextdocument.h"
#include "qtextcursor.h"
#include <QtCore/qdebug.h>
#include <private/qwidget_p.h>
QT_BEGIN_NAMESPACE
class QSplashScreenPrivate : public QWidgetPrivate
{
Q_DECLARE_PUBLIC(QSplashScreen)
public:
QPixmap pixmap;
QString currStatus;
QColor currColor;
int currAlign;
inline QSplashScreenPrivate();
};
/*!
\class QSplashScreen
\brief The QSplashScreen widget provides a splash screen that can
be shown during application startup.
A splash screen is a widget that is usually displayed when an
application is being started. Splash screens are often used for
applications that have long start up times (e.g. database or
networking applications that take time to establish connections) to
provide the user with feedback that the application is loading.
The splash screen appears in the center of the screen. It may be
useful to add the Qt::WindowStaysOnTopHint to the splash widget's
window flags if you want to keep it above all the other windows on
the desktop.
Some X11 window managers do not support the "stays on top" flag. A
solution is to set up a timer that periodically calls raise() on
the splash screen to simulate the "stays on top" effect.
The most common usage is to show a splash screen before the main
widget is displayed on the screen. This is illustrated in the
following code snippet in which a splash screen is displayed and
some initialization tasks are performed before the application's
main window is shown:
\snippet doc/src/snippets/qsplashscreen/main.cpp 0
\dots
\snippet doc/src/snippets/qsplashscreen/main.cpp 1
The user can hide the splash screen by clicking on it with the
mouse. Since the splash screen is typically displayed before the
event loop has started running, it is necessary to periodically
call QApplication::processEvents() to receive the mouse clicks.
It is sometimes useful to update the splash screen with messages,
for example, announcing connections established or modules loaded
as the application starts up:
\snippet doc/src/snippets/code/src_gui_widgets_qsplashscreen.cpp 0
QSplashScreen supports this with the showMessage() function. If you
wish to do your own drawing you can get a pointer to the pixmap
used in the splash screen with pixmap(). Alternatively, you can
subclass QSplashScreen and reimplement drawContents().
*/
/*!
Construct a splash screen that will display the \a pixmap.
There should be no need to set the widget flags, \a f, except
perhaps Qt::WindowStaysOnTopHint.
*/
QSplashScreen::QSplashScreen(const QPixmap &pixmap, Qt::WindowFlags f)
: QWidget(*(new QSplashScreenPrivate()), 0, Qt::SplashScreen | Qt::FramelessWindowHint | f)
{
setPixmap(pixmap); // Does an implicit repaint
}
/*!
\overload
This function allows you to specify a parent for your splashscreen. The
typical use for this constructor is if you have a multiple screens and
prefer to have the splash screen on a different screen than your primary
one. In that case pass the proper desktop() as the \a parent.
*/
QSplashScreen::QSplashScreen(QWidget *parent, const QPixmap &pixmap, Qt::WindowFlags f)
: QWidget(*new QSplashScreenPrivate, parent, Qt::SplashScreen | f)
{
d_func()->pixmap = pixmap;
setPixmap(d_func()->pixmap); // Does an implicit repaint
}
/*!
Destructor.
*/
QSplashScreen::~QSplashScreen()
{
}
/*!
\reimp
*/
void QSplashScreen::mousePressEvent(QMouseEvent *)
{
hide();
}
/*!
This overrides QWidget::repaint(). It differs from the standard
repaint function in that it also calls QApplication::flush() to
ensure the updates are displayed, even when there is no event loop
present.
*/
void QSplashScreen::repaint()
{
QWidget::repaint();
QApplication::flush();
}
/*!
\fn QSplashScreen::messageChanged(const QString &message)
This signal is emitted when the message on the splash screen
changes. \a message is the new message and is a null-string
when the message has been removed.
\sa showMessage(), clearMessage()
*/
/*!
Draws the \a message text onto the splash screen with color \a
color and aligns the text according to the flags in \a alignment.
To make sure the splash screen is repainted immediately, you can
call \l{QCoreApplication}'s
\l{QCoreApplication::}{processEvents()} after the call to
showMessage(). You usually want this to make sure that the message
is kept up to date with what your application is doing (e.g.,
loading files).
\sa Qt::Alignment, clearMessage()
*/
void QSplashScreen::showMessage(const QString &message, int alignment,
const QColor &color)
{
Q_D(QSplashScreen);
d->currStatus = message;
d->currAlign = alignment;
d->currColor = color;
emit messageChanged(d->currStatus);
repaint();
}
/*!
Removes the message being displayed on the splash screen
\sa showMessage()
*/
void QSplashScreen::clearMessage()
{
d_func()->currStatus.clear();
emit messageChanged(d_func()->currStatus);
repaint();
}
/*!
Makes the splash screen wait until the widget \a mainWin is displayed
before calling close() on itself.
*/
void QSplashScreen::finish(QWidget *mainWin)
{
if (mainWin) {
#if defined(Q_WS_X11)
extern void qt_x11_wait_for_window_manager(QWidget *mainWin);
qt_x11_wait_for_window_manager(mainWin);
#endif
}
close();
}
/*!
Sets the pixmap that will be used as the splash screen's image to
\a pixmap.
*/
void QSplashScreen::setPixmap(const QPixmap &pixmap)
{
Q_D(QSplashScreen);
d->pixmap = pixmap;
setAttribute(Qt::WA_TranslucentBackground, pixmap.hasAlpha());
QRect r(QPoint(), d->pixmap.size());
resize(r.size());
move(QApplication::desktop()->screenGeometry().center() - r.center());
if (isVisible())
repaint();
}
/*!
Returns the pixmap that is used in the splash screen. The image
does not have any of the text drawn by showMessage() calls.
*/
const QPixmap QSplashScreen::pixmap() const
{
return d_func()->pixmap;
}
/*!
\internal
*/
inline QSplashScreenPrivate::QSplashScreenPrivate() : currAlign(Qt::AlignLeft)
{
}
/*!
Draw the contents of the splash screen using painter \a painter.
The default implementation draws the message passed by showMessage().
Reimplement this function if you want to do your own drawing on
the splash screen.
*/
void QSplashScreen::drawContents(QPainter *painter)
{
Q_D(QSplashScreen);
painter->setPen(d->currColor);
QRect r = rect().adjusted(5, 5, -5, -5);
if (Qt::mightBeRichText(d->currStatus)) {
QTextDocument doc;
#ifdef QT_NO_TEXTHTMLPARSER
doc.setPlainText(d->currStatus);
#else
doc.setHtml(d->currStatus);
#endif
doc.setTextWidth(r.width());
QTextCursor cursor(&doc);
cursor.select(QTextCursor::Document);
QTextBlockFormat fmt;
fmt.setAlignment(Qt::Alignment(d->currAlign));
cursor.mergeBlockFormat(fmt);
painter->save();
painter->translate(r.topLeft());
doc.drawContents(painter);
painter->restore();
} else {
painter->drawText(r, d->currAlign, d->currStatus);
}
}
/*!
\fn void QSplashScreen::message(const QString &message, int alignment,
const QColor &color)
\compat
Use showMessage() instead.
*/
/*!
\fn void QSplashScreen::clear()
\compat
Use clearMessage() instead.
*/
/*! \reimp */
bool QSplashScreen::event(QEvent *e)
{
if (e->type() == QEvent::Paint) {
Q_D(QSplashScreen);
QPainter painter(this);
if (!d->pixmap.isNull())
painter.drawPixmap(QPoint(), d->pixmap);
drawContents(&painter);
}
return QWidget::event(e);
}
QT_END_NAMESPACE
#endif //QT_NO_SPLASHSCREEN
|