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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="small-subtitle">widgets/tablet/mainwindow.cpp</span>
<!-- $$$widgets/tablet/mainwindow.cpp-description -->
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<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:
**
** &quot;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
** &quot;AS IS&quot; 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.&quot;
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &lt;QtGui&gt;</span>
<span class="preprocessor">#include &quot;mainwindow.h&quot;</span>
<span class="preprocessor">#include &quot;tabletcanvas.h&quot;</span>
MainWindow<span class="operator">::</span>MainWindow(TabletCanvas <span class="operator">*</span>canvas)
{
myCanvas <span class="operator">=</span> canvas;
createActions();
createMenus();
myCanvas<span class="operator">-</span><span class="operator">&gt;</span>setColor(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>red);
myCanvas<span class="operator">-</span><span class="operator">&gt;</span>setLineWidthType(TabletCanvas<span class="operator">::</span>LineWidthPressure);
myCanvas<span class="operator">-</span><span class="operator">&gt;</span>setAlphaChannelType(TabletCanvas<span class="operator">::</span>NoAlpha);
myCanvas<span class="operator">-</span><span class="operator">&gt;</span>setColorSaturationType(TabletCanvas<span class="operator">::</span>NoSaturation);
setWindowTitle(tr(<span class="string">&quot;Tablet Example&quot;</span>));
setCentralWidget(myCanvas);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>brushColorAct()
{
<span class="type"><a href="qcolor.html">QColor</a></span> color <span class="operator">=</span> <span class="type"><a href="qcolordialog.html">QColorDialog</a></span><span class="operator">::</span>getColor(myCanvas<span class="operator">-</span><span class="operator">&gt;</span>color());
<span class="keyword">if</span> (color<span class="operator">.</span>isValid())
myCanvas<span class="operator">-</span><span class="operator">&gt;</span>setColor(color);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>alphaActionTriggered(<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>action)
{
<span class="keyword">if</span> (action <span class="operator">=</span><span class="operator">=</span> alphaChannelPressureAction) {
myCanvas<span class="operator">-</span><span class="operator">&gt;</span>setAlphaChannelType(TabletCanvas<span class="operator">::</span>AlphaPressure);
} <span class="keyword">else</span> <span class="keyword">if</span> (action <span class="operator">=</span><span class="operator">=</span> alphaChannelTiltAction) {
myCanvas<span class="operator">-</span><span class="operator">&gt;</span>setAlphaChannelType(TabletCanvas<span class="operator">::</span>AlphaTilt);
} <span class="keyword">else</span> {
myCanvas<span class="operator">-</span><span class="operator">&gt;</span>setAlphaChannelType(TabletCanvas<span class="operator">::</span>NoAlpha);
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>lineWidthActionTriggered(<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>action)
{
<span class="keyword">if</span> (action <span class="operator">=</span><span class="operator">=</span> lineWidthPressureAction) {
myCanvas<span class="operator">-</span><span class="operator">&gt;</span>setLineWidthType(TabletCanvas<span class="operator">::</span>LineWidthPressure);
} <span class="keyword">else</span> <span class="keyword">if</span> (action <span class="operator">=</span><span class="operator">=</span> lineWidthTiltAction) {
myCanvas<span class="operator">-</span><span class="operator">&gt;</span>setLineWidthType(TabletCanvas<span class="operator">::</span>LineWidthTilt);
} <span class="keyword">else</span> {
myCanvas<span class="operator">-</span><span class="operator">&gt;</span>setLineWidthType(TabletCanvas<span class="operator">::</span>NoLineWidth);
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>saturationActionTriggered(<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>action)
{
<span class="keyword">if</span> (action <span class="operator">=</span><span class="operator">=</span> colorSaturationVTiltAction) {
myCanvas<span class="operator">-</span><span class="operator">&gt;</span>setColorSaturationType(TabletCanvas<span class="operator">::</span>SaturationVTilt);
} <span class="keyword">else</span> <span class="keyword">if</span> (action <span class="operator">=</span><span class="operator">=</span> colorSaturationHTiltAction) {
myCanvas<span class="operator">-</span><span class="operator">&gt;</span>setColorSaturationType(TabletCanvas<span class="operator">::</span>SaturationHTilt);
} <span class="keyword">else</span> <span class="keyword">if</span> (action <span class="operator">=</span><span class="operator">=</span> colorSaturationPressureAction) {
myCanvas<span class="operator">-</span><span class="operator">&gt;</span>setColorSaturationType(TabletCanvas<span class="operator">::</span>SaturationPressure);
} <span class="keyword">else</span> {
myCanvas<span class="operator">-</span><span class="operator">&gt;</span>setColorSaturationType(TabletCanvas<span class="operator">::</span>NoSaturation);
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>saveAct()
{
<span class="type"><a href="qstring.html">QString</a></span> path <span class="operator">=</span> <span class="type"><a href="qdir.html">QDir</a></span><span class="operator">::</span>currentPath() <span class="operator">+</span> <span class="string">&quot;/untitled.png&quot;</span>;
<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">&quot;Save Picture&quot;</span>)<span class="operator">,</span>
path);
<span class="keyword">if</span> (<span class="operator">!</span>myCanvas<span class="operator">-</span><span class="operator">&gt;</span>saveImage(fileName))
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> <span class="string">&quot;Error Saving Picture&quot;</span><span class="operator">,</span>
<span class="string">&quot;Could not save the image&quot;</span>);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>loadAct()
{
<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>getOpenFileName(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;Open Picture&quot;</span>)<span class="operator">,</span>
<span class="type"><a href="qdir.html">QDir</a></span><span class="operator">::</span>currentPath());
<span class="keyword">if</span> (<span class="operator">!</span>myCanvas<span class="operator">-</span><span class="operator">&gt;</span>loadImage(fileName))
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> <span class="string">&quot;Error Opening Picture&quot;</span><span class="operator">,</span>
<span class="string">&quot;Could not open picture&quot;</span>);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>aboutAct()
{
<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">&quot;About Tablet Example&quot;</span>)<span class="operator">,</span>
tr(<span class="string">&quot;This example shows use of a Wacom tablet in Qt&quot;</span>));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>createActions()
{
brushColorAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Brush Color...&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
brushColorAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcut(tr(<span class="string">&quot;Ctrl+C&quot;</span>));
connect(brushColorAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(brushColorAct()));
alphaChannelPressureAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Pressure&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
alphaChannelPressureAction<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
alphaChannelTiltAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Tilt&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
alphaChannelTiltAction<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
noAlphaChannelAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;No Alpha Channel&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
noAlphaChannelAction<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
noAlphaChannelAction<span class="operator">-</span><span class="operator">&gt;</span>setChecked(<span class="keyword">true</span>);
alphaChannelGroup <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qactiongroup.html">QActionGroup</a></span>(<span class="keyword">this</span>);
alphaChannelGroup<span class="operator">-</span><span class="operator">&gt;</span>addAction(alphaChannelPressureAction);
alphaChannelGroup<span class="operator">-</span><span class="operator">&gt;</span>addAction(alphaChannelTiltAction);
alphaChannelGroup<span class="operator">-</span><span class="operator">&gt;</span>addAction(noAlphaChannelAction);
connect(alphaChannelGroup<span class="operator">,</span> SIGNAL(triggered(<span class="type"><a href="qaction.html">QAction</a></span><span class="operator">*</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(alphaActionTriggered(<span class="type"><a href="qaction.html">QAction</a></span><span class="operator">*</span>)));
colorSaturationVTiltAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Vertical Tilt&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
colorSaturationVTiltAction<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
colorSaturationHTiltAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Horizontal Tilt&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
colorSaturationHTiltAction<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
colorSaturationPressureAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Pressure&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
colorSaturationPressureAction<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
noColorSaturationAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;No Color Saturation&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
noColorSaturationAction<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
noColorSaturationAction<span class="operator">-</span><span class="operator">&gt;</span>setChecked(<span class="keyword">true</span>);
colorSaturationGroup <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qactiongroup.html">QActionGroup</a></span>(<span class="keyword">this</span>);
colorSaturationGroup<span class="operator">-</span><span class="operator">&gt;</span>addAction(colorSaturationVTiltAction);
colorSaturationGroup<span class="operator">-</span><span class="operator">&gt;</span>addAction(colorSaturationHTiltAction);
colorSaturationGroup<span class="operator">-</span><span class="operator">&gt;</span>addAction(colorSaturationPressureAction);
colorSaturationGroup<span class="operator">-</span><span class="operator">&gt;</span>addAction(noColorSaturationAction);
connect(colorSaturationGroup<span class="operator">,</span> SIGNAL(triggered(<span class="type"><a href="qaction.html">QAction</a></span><span class="operator">*</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(saturationActionTriggered(<span class="type"><a href="qaction.html">QAction</a></span><span class="operator">*</span>)));
lineWidthPressureAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Pressure&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
lineWidthPressureAction<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
lineWidthPressureAction<span class="operator">-</span><span class="operator">&gt;</span>setChecked(<span class="keyword">true</span>);
lineWidthTiltAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Tilt&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
lineWidthTiltAction<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
lineWidthFixedAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Fixed&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
lineWidthFixedAction<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
lineWidthGroup <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qactiongroup.html">QActionGroup</a></span>(<span class="keyword">this</span>);
lineWidthGroup<span class="operator">-</span><span class="operator">&gt;</span>addAction(lineWidthPressureAction);
lineWidthGroup<span class="operator">-</span><span class="operator">&gt;</span>addAction(lineWidthTiltAction);
lineWidthGroup<span class="operator">-</span><span class="operator">&gt;</span>addAction(lineWidthFixedAction);
connect(lineWidthGroup<span class="operator">,</span> SIGNAL(triggered(<span class="type"><a href="qaction.html">QAction</a></span><span class="operator">*</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(lineWidthActionTriggered(<span class="type"><a href="qaction.html">QAction</a></span><span class="operator">*</span>)));
exitAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;E&amp;xit&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
exitAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Quit);
connect(exitAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(close()));
loadAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Open...&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
loadAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Open);
connect(loadAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(loadAct()));
saveAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Save As...&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
saveAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>SaveAs);
connect(saveAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(saveAct()));
aboutAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;A&amp;bout&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
aboutAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcut(tr(<span class="string">&quot;Ctrl+B&quot;</span>));
connect(aboutAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(aboutAct()));
aboutQtAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;About &amp;Qt&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
aboutQtAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcut(tr(<span class="string">&quot;Ctrl+Q&quot;</span>));
connect(aboutQtAction<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">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;File&quot;</span>));
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(loadAction);
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(saveAction);
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addSeparator();
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(exitAction);
brushMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;Brush&quot;</span>));
brushMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(brushColorAction);
tabletMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;Tablet&quot;</span>));
lineWidthMenu <span class="operator">=</span> tabletMenu<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;Line Width&quot;</span>));
lineWidthMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(lineWidthPressureAction);
lineWidthMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(lineWidthTiltAction);
lineWidthMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(lineWidthFixedAction);
alphaChannelMenu <span class="operator">=</span> tabletMenu<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;Alpha Channel&quot;</span>));
alphaChannelMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(alphaChannelPressureAction);
alphaChannelMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(alphaChannelTiltAction);
alphaChannelMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(noAlphaChannelAction);
colorSaturationMenu <span class="operator">=</span> tabletMenu<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;Color Saturation&quot;</span>));
colorSaturationMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(colorSaturationVTiltAction);
colorSaturationMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(colorSaturationHTiltAction);
colorSaturationMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(noColorSaturationAction);
helpMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(<span class="string">&quot;&amp;Help&quot;</span>);
helpMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(aboutAction);
helpMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(aboutQtAction);
}</pre>
</div>
<!-- @@@widgets/tablet/mainwindow.cpp -->
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