<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>mainwindow.cpp Example File | Qt Widgets 5.9</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.9</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-widgets-tablet-example.html">Tablet Example</a></td><td >mainwindow.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">mainwindow.cpp Example File</h1> <span class="subtitle">widgets/tablet/mainwindow.cpp</span> <!-- $$$widgets/tablet/mainwindow.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** BSD License Usage ** Alternatively, 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 <QtWidgets></span> <span class="preprocessor">#include "mainwindow.h"</span> <span class="preprocessor">#include "tabletcanvas.h"</span> MainWindow<span class="operator">::</span>MainWindow(TabletCanvas <span class="operator">*</span>canvas) : m_canvas(canvas)<span class="operator">,</span> m_colorDialog(Q_NULLPTR) { createMenus(); setWindowTitle(tr(<span class="string">"Tablet Example"</span>)); setCentralWidget(m_canvas); } <span class="type">void</span> MainWindow<span class="operator">::</span>setBrushColor() { <span class="keyword">if</span> (<span class="operator">!</span>m_colorDialog) { m_colorDialog <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcolordialog.html">QColorDialog</a></span>(<span class="keyword">this</span>); m_colorDialog<span class="operator">-</span><span class="operator">></span>setModal(<span class="keyword">false</span>); m_colorDialog<span class="operator">-</span><span class="operator">></span>setCurrentColor(m_canvas<span class="operator">-</span><span class="operator">></span>color()); connect(m_colorDialog<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qcolordialog.html">QColorDialog</a></span><span class="operator">::</span>colorSelected<span class="operator">,</span> m_canvas<span class="operator">,</span> <span class="operator">&</span>TabletCanvas<span class="operator">::</span>setColor); } m_colorDialog<span class="operator">-</span><span class="operator">></span>setVisible(<span class="keyword">true</span>); } <span class="type">void</span> MainWindow<span class="operator">::</span>setAlphaValuator(<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>action) { m_canvas<span class="operator">-</span><span class="operator">></span>setAlphaChannelValuator(action<span class="operator">-</span><span class="operator">></span>data()<span class="operator">.</span>value<span class="operator"><</span>TabletCanvas<span class="operator">::</span>Valuator<span class="operator">></span>()); } <span class="type">void</span> MainWindow<span class="operator">::</span>setLineWidthValuator(<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>action) { m_canvas<span class="operator">-</span><span class="operator">></span>setLineWidthType(action<span class="operator">-</span><span class="operator">></span>data()<span class="operator">.</span>value<span class="operator"><</span>TabletCanvas<span class="operator">::</span>Valuator<span class="operator">></span>()); } <span class="type">void</span> MainWindow<span class="operator">::</span>setSaturationValuator(<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>action) { m_canvas<span class="operator">-</span><span class="operator">></span>setColorSaturationValuator(action<span class="operator">-</span><span class="operator">></span>data()<span class="operator">.</span>value<span class="operator"><</span>TabletCanvas<span class="operator">::</span>Valuator<span class="operator">></span>()); } <span class="type">void</span> MainWindow<span class="operator">::</span>save() { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> path <span class="operator">=</span> <span class="type"><a href="../qtcore/qdir.html">QDir</a></span><span class="operator">::</span>currentPath() <span class="operator">+</span> <span class="string">"/untitled.png"</span>; <span class="type"><a href="../qtcore/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 Picture"</span>)<span class="operator">,</span> path); <span class="keyword">if</span> (<span class="operator">!</span>m_canvas<span class="operator">-</span><span class="operator">></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">"Error Saving Picture"</span><span class="operator">,</span> <span class="string">"Could not save the image"</span>); } <span class="type">void</span> MainWindow<span class="operator">::</span>load() { <span class="type"><a href="../qtcore/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">"Open Picture"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qdir.html">QDir</a></span><span class="operator">::</span>currentPath()); <span class="keyword">if</span> (<span class="operator">!</span>m_canvas<span class="operator">-</span><span class="operator">></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">"Error Opening Picture"</span><span class="operator">,</span> <span class="string">"Could not open picture"</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 Tablet Example"</span>)<span class="operator">,</span> tr(<span class="string">"This example shows how to use a graphics drawing tablet in Qt."</span>)); } <span class="type">void</span> MainWindow<span class="operator">::</span>createMenus() { <span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>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(tr(<span class="string">"&Open..."</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>load<span class="operator">,</span> <span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Open); fileMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&Save As..."</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>save<span class="operator">,</span> <span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>SaveAs); fileMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"E&xit"</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>close<span class="operator">,</span> <span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Quit); <span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>brushMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"&Brush"</span>)); brushMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&Brush Color..."</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>setBrushColor<span class="operator">,</span> tr(<span class="string">"Ctrl+B"</span>)); <span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>tabletMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"&Tablet"</span>)); <span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>lineWidthMenu <span class="operator">=</span> tabletMenu<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"&Line Width"</span>)); <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>lineWidthPressureAction <span class="operator">=</span> lineWidthMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&Pressure"</span>)); lineWidthPressureAction<span class="operator">-</span><span class="operator">></span>setData(TabletCanvas<span class="operator">::</span>PressureValuator); lineWidthPressureAction<span class="operator">-</span><span class="operator">></span>setCheckable(<span class="keyword">true</span>); lineWidthPressureAction<span class="operator">-</span><span class="operator">></span>setChecked(<span class="keyword">true</span>); <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>lineWidthTiltAction <span class="operator">=</span> lineWidthMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&Tilt"</span>)); lineWidthTiltAction<span class="operator">-</span><span class="operator">></span>setData(TabletCanvas<span class="operator">::</span>TiltValuator); lineWidthTiltAction<span class="operator">-</span><span class="operator">></span>setCheckable(<span class="keyword">true</span>); <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>lineWidthFixedAction <span class="operator">=</span> lineWidthMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&Fixed"</span>)); lineWidthFixedAction<span class="operator">-</span><span class="operator">></span>setData(TabletCanvas<span class="operator">::</span>NoValuator); lineWidthFixedAction<span class="operator">-</span><span class="operator">></span>setCheckable(<span class="keyword">true</span>); <span class="type"><a href="qactiongroup.html">QActionGroup</a></span> <span class="operator">*</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">></span>addAction(lineWidthPressureAction); lineWidthGroup<span class="operator">-</span><span class="operator">></span>addAction(lineWidthTiltAction); lineWidthGroup<span class="operator">-</span><span class="operator">></span>addAction(lineWidthFixedAction); connect(lineWidthGroup<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qactiongroup.html">QActionGroup</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>setLineWidthValuator); <span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>alphaChannelMenu <span class="operator">=</span> tabletMenu<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"&Alpha Channel"</span>)); <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>alphaChannelPressureAction <span class="operator">=</span> alphaChannelMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&Pressure"</span>)); alphaChannelPressureAction<span class="operator">-</span><span class="operator">></span>setData(TabletCanvas<span class="operator">::</span>PressureValuator); alphaChannelPressureAction<span class="operator">-</span><span class="operator">></span>setCheckable(<span class="keyword">true</span>); <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>alphaChannelTangentialPressureAction <span class="operator">=</span> alphaChannelMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"T&angential Pressure"</span>)); alphaChannelTangentialPressureAction<span class="operator">-</span><span class="operator">></span>setData(TabletCanvas<span class="operator">::</span>TangentialPressureValuator); alphaChannelTangentialPressureAction<span class="operator">-</span><span class="operator">></span>setCheckable(<span class="keyword">true</span>); alphaChannelTangentialPressureAction<span class="operator">-</span><span class="operator">></span>setChecked(<span class="keyword">true</span>); <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>alphaChannelTiltAction <span class="operator">=</span> alphaChannelMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&Tilt"</span>)); alphaChannelTiltAction<span class="operator">-</span><span class="operator">></span>setData(TabletCanvas<span class="operator">::</span>TiltValuator); alphaChannelTiltAction<span class="operator">-</span><span class="operator">></span>setCheckable(<span class="keyword">true</span>); <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>noAlphaChannelAction <span class="operator">=</span> alphaChannelMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"No Alpha Channel"</span>)); noAlphaChannelAction<span class="operator">-</span><span class="operator">></span>setData(TabletCanvas<span class="operator">::</span>NoValuator); noAlphaChannelAction<span class="operator">-</span><span class="operator">></span>setCheckable(<span class="keyword">true</span>); <span class="type"><a href="qactiongroup.html">QActionGroup</a></span> <span class="operator">*</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">></span>addAction(alphaChannelPressureAction); alphaChannelGroup<span class="operator">-</span><span class="operator">></span>addAction(alphaChannelTangentialPressureAction); alphaChannelGroup<span class="operator">-</span><span class="operator">></span>addAction(alphaChannelTiltAction); alphaChannelGroup<span class="operator">-</span><span class="operator">></span>addAction(noAlphaChannelAction); connect(alphaChannelGroup<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qactiongroup.html">QActionGroup</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>setAlphaValuator); <span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>colorSaturationMenu <span class="operator">=</span> tabletMenu<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"&Color Saturation"</span>)); <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>colorSaturationVTiltAction <span class="operator">=</span> colorSaturationMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&Vertical Tilt"</span>)); colorSaturationVTiltAction<span class="operator">-</span><span class="operator">></span>setData(TabletCanvas<span class="operator">::</span>VTiltValuator); colorSaturationVTiltAction<span class="operator">-</span><span class="operator">></span>setCheckable(<span class="keyword">true</span>); <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>colorSaturationHTiltAction <span class="operator">=</span> colorSaturationMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&Horizontal Tilt"</span>)); colorSaturationHTiltAction<span class="operator">-</span><span class="operator">></span>setData(TabletCanvas<span class="operator">::</span>HTiltValuator); colorSaturationHTiltAction<span class="operator">-</span><span class="operator">></span>setCheckable(<span class="keyword">true</span>); <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>colorSaturationPressureAction <span class="operator">=</span> colorSaturationMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&Pressure"</span>)); colorSaturationPressureAction<span class="operator">-</span><span class="operator">></span>setData(TabletCanvas<span class="operator">::</span>PressureValuator); colorSaturationPressureAction<span class="operator">-</span><span class="operator">></span>setCheckable(<span class="keyword">true</span>); <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>noColorSaturationAction <span class="operator">=</span> colorSaturationMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&No Color Saturation"</span>)); noColorSaturationAction<span class="operator">-</span><span class="operator">></span>setData(TabletCanvas<span class="operator">::</span>NoValuator); noColorSaturationAction<span class="operator">-</span><span class="operator">></span>setCheckable(<span class="keyword">true</span>); noColorSaturationAction<span class="operator">-</span><span class="operator">></span>setChecked(<span class="keyword">true</span>); <span class="type"><a href="qactiongroup.html">QActionGroup</a></span> <span class="operator">*</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">></span>addAction(colorSaturationVTiltAction); colorSaturationGroup<span class="operator">-</span><span class="operator">></span>addAction(colorSaturationHTiltAction); colorSaturationGroup<span class="operator">-</span><span class="operator">></span>addAction(colorSaturationPressureAction); colorSaturationGroup<span class="operator">-</span><span class="operator">></span>addAction(noColorSaturationAction); connect(colorSaturationGroup<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qactiongroup.html">QActionGroup</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>setSaturationValuator); <span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>helpMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(<span class="string">"&Help"</span>); helpMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"A&bout"</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>about); helpMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"About &Qt"</span>)<span class="operator">,</span> qApp<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>aboutQt); } </pre> </div> <!-- @@@widgets/tablet/mainwindow.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>