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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="small-subtitle">opengl/grabber/mainwindow.cpp</span>
<!-- $$$opengl/grabber/mainwindow.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 <QtOpenGL></span>
<span class="preprocessor">#include "glwidget.h"</span>
<span class="preprocessor">#include "mainwindow.h"</span>
MainWindow<span class="operator">::</span>MainWindow()
{
centralWidget <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qwidget.html">QWidget</a></span>;
setCentralWidget(centralWidget);
glWidget <span class="operator">=</span> <span class="keyword">new</span> GLWidget;
pixmapLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
glWidgetArea <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qscrollarea.html">QScrollArea</a></span>;
glWidgetArea<span class="operator">-</span><span class="operator">></span>setWidget(glWidget);
glWidgetArea<span class="operator">-</span><span class="operator">></span>setWidgetResizable(<span class="keyword">true</span>);
glWidgetArea<span class="operator">-</span><span class="operator">></span>setHorizontalScrollBarPolicy(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>ScrollBarAlwaysOff);
glWidgetArea<span class="operator">-</span><span class="operator">></span>setVerticalScrollBarPolicy(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>ScrollBarAlwaysOff);
glWidgetArea<span class="operator">-</span><span class="operator">></span>setSizePolicy(<span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Ignored<span class="operator">,</span> <span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Ignored);
glWidgetArea<span class="operator">-</span><span class="operator">></span>setMinimumSize(<span class="number">50</span><span class="operator">,</span> <span class="number">50</span>);
pixmapLabelArea <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qscrollarea.html">QScrollArea</a></span>;
pixmapLabelArea<span class="operator">-</span><span class="operator">></span>setWidget(pixmapLabel);
pixmapLabelArea<span class="operator">-</span><span class="operator">></span>setSizePolicy(<span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Ignored<span class="operator">,</span> <span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Ignored);
pixmapLabelArea<span class="operator">-</span><span class="operator">></span>setMinimumSize(<span class="number">50</span><span class="operator">,</span> <span class="number">50</span>);
xSlider <span class="operator">=</span> createSlider(SIGNAL(xRotationChanged(<span class="type">int</span>))<span class="operator">,</span>
SLOT(setXRotation(<span class="type">int</span>)));
ySlider <span class="operator">=</span> createSlider(SIGNAL(yRotationChanged(<span class="type">int</span>))<span class="operator">,</span>
SLOT(setYRotation(<span class="type">int</span>)));
zSlider <span class="operator">=</span> createSlider(SIGNAL(zRotationChanged(<span class="type">int</span>))<span class="operator">,</span>
SLOT(setZRotation(<span class="type">int</span>)));
createActions();
createMenus();
<span class="type"><a href="qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>centralLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>;
centralLayout<span class="operator">-</span><span class="operator">></span>addWidget(glWidgetArea<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
centralLayout<span class="operator">-</span><span class="operator">></span>addWidget(pixmapLabelArea<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span>);
centralLayout<span class="operator">-</span><span class="operator">></span>addWidget(xSlider<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>);
centralLayout<span class="operator">-</span><span class="operator">></span>addWidget(ySlider<span class="operator">,</span> <span class="number">2</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>);
centralLayout<span class="operator">-</span><span class="operator">></span>addWidget(zSlider<span class="operator">,</span> <span class="number">3</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>);
centralWidget<span class="operator">-</span><span class="operator">></span>setLayout(centralLayout);
xSlider<span class="operator">-</span><span class="operator">></span>setValue(<span class="number">15</span> <span class="operator">*</span> <span class="number">16</span>);
ySlider<span class="operator">-</span><span class="operator">></span>setValue(<span class="number">345</span> <span class="operator">*</span> <span class="number">16</span>);
zSlider<span class="operator">-</span><span class="operator">></span>setValue(<span class="number">0</span> <span class="operator">*</span> <span class="number">16</span>);
setWindowTitle(tr(<span class="string">"Grabber"</span>));
resize(<span class="number">400</span><span class="operator">,</span> <span class="number">300</span>);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>renderIntoPixmap()
{
<span class="type"><a href="qsize.html">QSize</a></span> size <span class="operator">=</span> getSize();
<span class="keyword">if</span> (size<span class="operator">.</span>isValid()) {
<span class="type"><a href="qpixmap.html">QPixmap</a></span> pixmap <span class="operator">=</span> glWidget<span class="operator">-</span><span class="operator">></span>renderPixmap(size<span class="operator">.</span>width()<span class="operator">,</span> size<span class="operator">.</span>height());
setPixmap(pixmap);
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>grabFrameBuffer()
{
<span class="type"><a href="qimage.html">QImage</a></span> image <span class="operator">=</span> glWidget<span class="operator">-</span><span class="operator">></span>grabFrameBuffer();
setPixmap(<span class="type"><a href="qpixmap.html">QPixmap</a></span><span class="operator">::</span>fromImage(image));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>clearPixmap()
{
setPixmap(<span class="type"><a href="qpixmap.html">QPixmap</a></span>());
}
<span class="type">void</span> MainWindow<span class="operator">::</span>about()
{
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>about(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"About Grabber"</span>)<span class="operator">,</span>
tr(<span class="string">"The <b>Grabber</b> example demonstrates two approaches for "</span>
<span class="string">"rendering OpenGL into a Qt pixmap."</span>));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>createActions()
{
renderIntoPixmapAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"&Render into Pixmap..."</span>)<span class="operator">,</span> <span class="keyword">this</span>);
renderIntoPixmapAct<span class="operator">-</span><span class="operator">></span>setShortcut(tr(<span class="string">"Ctrl+R"</span>));
connect(renderIntoPixmapAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(renderIntoPixmap()));
grabFrameBufferAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"&Grab Frame Buffer"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
grabFrameBufferAct<span class="operator">-</span><span class="operator">></span>setShortcut(tr(<span class="string">"Ctrl+G"</span>));
connect(grabFrameBufferAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(grabFrameBuffer()));
clearPixmapAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"&Clear Pixmap"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
clearPixmapAct<span class="operator">-</span><span class="operator">></span>setShortcut(tr(<span class="string">"Ctrl+L"</span>));
connect(clearPixmapAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(clearPixmap()));
exitAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"E&xit"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
exitAct<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Quit);
connect(exitAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(close()));
aboutAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"&About"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
connect(aboutAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(about()));
aboutQtAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"About &Qt"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
connect(aboutQtAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> qApp<span class="operator">,</span> SLOT(aboutQt()));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>createMenus()
{
fileMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"&File"</span>));
fileMenu<span class="operator">-</span><span class="operator">></span>addAction(renderIntoPixmapAct);
fileMenu<span class="operator">-</span><span class="operator">></span>addAction(grabFrameBufferAct);
fileMenu<span class="operator">-</span><span class="operator">></span>addAction(clearPixmapAct);
fileMenu<span class="operator">-</span><span class="operator">></span>addSeparator();
fileMenu<span class="operator">-</span><span class="operator">></span>addAction(exitAct);
helpMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"&Help"</span>));
helpMenu<span class="operator">-</span><span class="operator">></span>addAction(aboutAct);
helpMenu<span class="operator">-</span><span class="operator">></span>addAction(aboutQtAct);
}
<span class="type"><a href="qslider.html">QSlider</a></span> <span class="operator">*</span>MainWindow<span class="operator">::</span>createSlider(<span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>changedSignal<span class="operator">,</span>
<span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>setterSlot)
{
<span class="type"><a href="qslider.html">QSlider</a></span> <span class="operator">*</span>slider <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qslider.html">QSlider</a></span>(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Horizontal);
slider<span class="operator">-</span><span class="operator">></span>setRange(<span class="number">0</span><span class="operator">,</span> <span class="number">360</span> <span class="operator">*</span> <span class="number">16</span>);
slider<span class="operator">-</span><span class="operator">></span>setSingleStep(<span class="number">16</span>);
slider<span class="operator">-</span><span class="operator">></span>setPageStep(<span class="number">15</span> <span class="operator">*</span> <span class="number">16</span>);
slider<span class="operator">-</span><span class="operator">></span>setTickInterval(<span class="number">15</span> <span class="operator">*</span> <span class="number">16</span>);
slider<span class="operator">-</span><span class="operator">></span>setTickPosition(<span class="type"><a href="qslider.html">QSlider</a></span><span class="operator">::</span>TicksRight);
connect(slider<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span> glWidget<span class="operator">,</span> setterSlot);
connect(glWidget<span class="operator">,</span> changedSignal<span class="operator">,</span> slider<span class="operator">,</span> SLOT(setValue(<span class="type">int</span>)));
<span class="keyword">return</span> slider;
}
<span class="type">void</span> MainWindow<span class="operator">::</span>setPixmap(<span class="keyword">const</span> <span class="type"><a href="qpixmap.html">QPixmap</a></span> <span class="operator">&</span>pixmap)
{
pixmapLabel<span class="operator">-</span><span class="operator">></span>setPixmap(pixmap);
<span class="type"><a href="qsize.html">QSize</a></span> size <span class="operator">=</span> pixmap<span class="operator">.</span>size();
<span class="keyword">if</span> (size <span class="operator">-</span> <span class="type"><a href="qsize.html">QSize</a></span>(<span class="number">1</span><span class="operator">,</span> <span class="number">0</span>) <span class="operator">=</span><span class="operator">=</span> pixmapLabelArea<span class="operator">-</span><span class="operator">></span>maximumViewportSize())
size <span class="operator">-</span><span class="operator">=</span> <span class="type"><a href="qsize.html">QSize</a></span>(<span class="number">1</span><span class="operator">,</span> <span class="number">0</span>);
pixmapLabel<span class="operator">-</span><span class="operator">></span>resize(size);
}
<span class="type"><a href="qsize.html">QSize</a></span> MainWindow<span class="operator">::</span>getSize()
{
<span class="type">bool</span> ok;
<span class="type"><a href="qstring.html">QString</a></span> text <span class="operator">=</span> <span class="type"><a href="qinputdialog.html">QInputDialog</a></span><span class="operator">::</span>getText(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Grabber"</span>)<span class="operator">,</span>
tr(<span class="string">"Enter pixmap size:"</span>)<span class="operator">,</span>
<span class="type"><a href="qlineedit.html">QLineEdit</a></span><span class="operator">::</span>Normal<span class="operator">,</span>
tr(<span class="string">"%1 x %2"</span>)<span class="operator">.</span>arg(glWidget<span class="operator">-</span><span class="operator">></span>width())
<span class="operator">.</span>arg(glWidget<span class="operator">-</span><span class="operator">></span>height())<span class="operator">,</span>
<span class="operator">&</span>ok);
<span class="keyword">if</span> (<span class="operator">!</span>ok)
<span class="keyword">return</span> <span class="type"><a href="qsize.html">QSize</a></span>();
<span class="type"><a href="qregexp.html">QRegExp</a></span> regExp(tr(<span class="string">"([0-9]+) *x *([0-9]+)"</span>));
<span class="keyword">if</span> (regExp<span class="operator">.</span>exactMatch(text)) {
<span class="type">int</span> width <span class="operator">=</span> regExp<span class="operator">.</span>cap(<span class="number">1</span>)<span class="operator">.</span>toInt();
<span class="type">int</span> height <span class="operator">=</span> regExp<span class="operator">.</span>cap(<span class="number">2</span>)<span class="operator">.</span>toInt();
<span class="keyword">if</span> (width <span class="operator">></span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> width <span class="operator"><</span> <span class="number">2048</span> <span class="operator">&</span><span class="operator">&</span> height <span class="operator">></span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> height <span class="operator"><</span> <span class="number">2048</span>)
<span class="keyword">return</span> <span class="type"><a href="qsize.html">QSize</a></span>(width<span class="operator">,</span> height);
}
<span class="keyword">return</span> glWidget<span class="operator">-</span><span class="operator">></span>size();
}</pre>
</div>
<!-- @@@opengl/grabber/mainwindow.cpp -->
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