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<h1 class="title">screenshot.cpp Example File</h1>
<span class="small-subtitle">desktop/screenshot/screenshot.cpp</span>
<!-- $$$desktop/screenshot/screenshot.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include <QtGui></span>
<span class="preprocessor">#include "screenshot.h"</span>
Screenshot<span class="operator">::</span>Screenshot()
{
screenshotLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
screenshotLabel<span class="operator">-</span><span class="operator">></span>setSizePolicy(<span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Expanding<span class="operator">,</span>
<span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Expanding);
screenshotLabel<span class="operator">-</span><span class="operator">></span>setAlignment(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>AlignCenter);
screenshotLabel<span class="operator">-</span><span class="operator">></span>setMinimumSize(<span class="number">240</span><span class="operator">,</span> <span class="number">160</span>);
createOptionsGroupBox();
createButtonsLayout();
mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>;
mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(screenshotLabel);
mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(optionsGroupBox);
mainLayout<span class="operator">-</span><span class="operator">></span>addLayout(buttonsLayout);
setLayout(mainLayout);
shootScreen();
delaySpinBox<span class="operator">-</span><span class="operator">></span>setValue(<span class="number">5</span>);
setWindowTitle(tr(<span class="string">"Screenshot"</span>));
resize(<span class="number">300</span><span class="operator">,</span> <span class="number">200</span>);
}
<span class="type">void</span> Screenshot<span class="operator">::</span>resizeEvent(<span class="type"><a href="qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span> <span class="comment">/* event */</span>)
{
<span class="type"><a href="qsize.html">QSize</a></span> scaledSize <span class="operator">=</span> originalPixmap<span class="operator">.</span>size();
scaledSize<span class="operator">.</span>scale(screenshotLabel<span class="operator">-</span><span class="operator">></span>size()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>KeepAspectRatio);
<span class="keyword">if</span> (<span class="operator">!</span>screenshotLabel<span class="operator">-</span><span class="operator">></span>pixmap()
<span class="operator">|</span><span class="operator">|</span> scaledSize <span class="operator">!</span><span class="operator">=</span> screenshotLabel<span class="operator">-</span><span class="operator">></span>pixmap()<span class="operator">-</span><span class="operator">></span>size())
updateScreenshotLabel();
}
<span class="type">void</span> Screenshot<span class="operator">::</span>newScreenshot()
{
<span class="keyword">if</span> (hideThisWindowCheckBox<span class="operator">-</span><span class="operator">></span>isChecked())
hide();
newScreenshotButton<span class="operator">-</span><span class="operator">></span>setDisabled(<span class="keyword">true</span>);
<span class="type"><a href="qtimer.html">QTimer</a></span><span class="operator">::</span>singleShot(delaySpinBox<span class="operator">-</span><span class="operator">></span>value() <span class="operator">*</span> <span class="number">1000</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(shootScreen()));
}
<span class="type">void</span> Screenshot<span class="operator">::</span>saveScreenshot()
{
<span class="type"><a href="qstring.html">QString</a></span> format <span class="operator">=</span> <span class="string">"png"</span>;
<span class="type"><a href="qstring.html">QString</a></span> initialPath <span class="operator">=</span> <span class="type"><a href="qdir.html">QDir</a></span><span class="operator">::</span>currentPath() <span class="operator">+</span> tr(<span class="string">"/untitled."</span>) <span class="operator">+</span> format;
<span class="type"><a href="qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getSaveFileName(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Save As"</span>)<span class="operator">,</span>
initialPath<span class="operator">,</span>
tr(<span class="string">"%1 Files (*.%2);;All Files (*)"</span>)
<span class="operator">.</span>arg(format<span class="operator">.</span>toUpper())
<span class="operator">.</span>arg(format));
<span class="keyword">if</span> (<span class="operator">!</span>fileName<span class="operator">.</span>isEmpty())
originalPixmap<span class="operator">.</span>save(fileName<span class="operator">,</span> format<span class="operator">.</span>toAscii());
}
<span class="type">void</span> Screenshot<span class="operator">::</span>shootScreen()
{
<span class="keyword">if</span> (delaySpinBox<span class="operator">-</span><span class="operator">></span>value() <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>)
qApp<span class="operator">-</span><span class="operator">></span>beep();
originalPixmap <span class="operator">=</span> <span class="type"><a href="qpixmap.html">QPixmap</a></span>(); <span class="comment">// clear image for low memory situations</span>
<span class="comment">// on embedded devices.</span>
originalPixmap <span class="operator">=</span> <span class="type"><a href="qpixmap.html">QPixmap</a></span><span class="operator">::</span>grabWindow(<span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>desktop()<span class="operator">-</span><span class="operator">></span>winId());
updateScreenshotLabel();
newScreenshotButton<span class="operator">-</span><span class="operator">></span>setDisabled(<span class="keyword">false</span>);
<span class="keyword">if</span> (hideThisWindowCheckBox<span class="operator">-</span><span class="operator">></span>isChecked())
show();
}
<span class="type">void</span> Screenshot<span class="operator">::</span>updateCheckBox()
{
<span class="keyword">if</span> (delaySpinBox<span class="operator">-</span><span class="operator">></span>value() <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) {
hideThisWindowCheckBox<span class="operator">-</span><span class="operator">></span>setDisabled(<span class="keyword">true</span>);
hideThisWindowCheckBox<span class="operator">-</span><span class="operator">></span>setChecked(<span class="keyword">false</span>);
}
<span class="keyword">else</span>
hideThisWindowCheckBox<span class="operator">-</span><span class="operator">></span>setDisabled(<span class="keyword">false</span>);
}
<span class="type">void</span> Screenshot<span class="operator">::</span>createOptionsGroupBox()
{
optionsGroupBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgroupbox.html">QGroupBox</a></span>(tr(<span class="string">"Options"</span>));
delaySpinBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qspinbox.html">QSpinBox</a></span>;
delaySpinBox<span class="operator">-</span><span class="operator">></span>setSuffix(tr(<span class="string">" s"</span>));
delaySpinBox<span class="operator">-</span><span class="operator">></span>setMaximum(<span class="number">60</span>);
connect(delaySpinBox<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateCheckBox()));
delaySpinBoxLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"Screenshot Delay:"</span>));
hideThisWindowCheckBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcheckbox.html">QCheckBox</a></span>(tr(<span class="string">"Hide This Window"</span>));
optionsGroupBoxLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>;
optionsGroupBoxLayout<span class="operator">-</span><span class="operator">></span>addWidget(delaySpinBoxLabel<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
optionsGroupBoxLayout<span class="operator">-</span><span class="operator">></span>addWidget(delaySpinBox<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span>);
optionsGroupBoxLayout<span class="operator">-</span><span class="operator">></span>addWidget(hideThisWindowCheckBox<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span>);
optionsGroupBox<span class="operator">-</span><span class="operator">></span>setLayout(optionsGroupBoxLayout);
}
<span class="type">void</span> Screenshot<span class="operator">::</span>createButtonsLayout()
{
newScreenshotButton <span class="operator">=</span> createButton(tr(<span class="string">"New Screenshot"</span>)<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(newScreenshot()));
saveScreenshotButton <span class="operator">=</span> createButton(tr(<span class="string">"Save Screenshot"</span>)<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(saveScreenshot()));
quitScreenshotButton <span class="operator">=</span> createButton(tr(<span class="string">"Quit"</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(close()));
buttonsLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span>;
buttonsLayout<span class="operator">-</span><span class="operator">></span>addStretch();
buttonsLayout<span class="operator">-</span><span class="operator">></span>addWidget(newScreenshotButton);
buttonsLayout<span class="operator">-</span><span class="operator">></span>addWidget(saveScreenshotButton);
buttonsLayout<span class="operator">-</span><span class="operator">></span>addWidget(quitScreenshotButton);
}
<span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>Screenshot<span class="operator">::</span>createButton(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>text<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>receiver<span class="operator">,</span>
<span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>member)
{
<span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>button <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(text);
button<span class="operator">-</span><span class="operator">></span>connect(button<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> receiver<span class="operator">,</span> member);
<span class="keyword">return</span> button;
}
<span class="type">void</span> Screenshot<span class="operator">::</span>updateScreenshotLabel()
{
screenshotLabel<span class="operator">-</span><span class="operator">></span>setPixmap(originalPixmap<span class="operator">.</span>scaled(screenshotLabel<span class="operator">-</span><span class="operator">></span>size()<span class="operator">,</span>
<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>KeepAspectRatio<span class="operator">,</span>
<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>SmoothTransformation));
}</pre>
</div>
<!-- @@@desktop/screenshot/screenshot.cpp -->
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