<?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>main.cpp Example File | Qt Quick 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="qtquick-index.html">Qt Quick</a></td><td ><a href="qtquick-quickwidgets-quickwidget-example.html">Qt Quick Widgets Example</a></td><td >main.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">main.cpp Example File</h1> <span class="subtitle">quickwidgets/quickwidget/main.cpp</span> <!-- $$$quickwidgets/quickwidget/main.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2017 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 <QQuickWidget></span> <span class="preprocessor">#include <QQuickItem></span> <span class="preprocessor">#include <QQmlError></span> <span class="preprocessor">#include <QtWidgets></span> <span class="preprocessor">#include "fbitem.h"</span> <span class="keyword">class</span> MainWindow : <span class="keyword">public</span> <span class="type">QMainWindow</span> { Q_OBJECT <span class="keyword">public</span>: MainWindow(); <span class="keyword">private</span> <span class="keyword">slots</span>: <span class="type">void</span> quickWidgetStatusChanged(<span class="type"><a href="qquickwidget.html">QQuickWidget</a></span><span class="operator">::</span>Status); <span class="type">void</span> sceneGraphError(<span class="type"><a href="qquickwindow.html">QQuickWindow</a></span><span class="operator">::</span>SceneGraphError error<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>message); <span class="type">void</span> grabFramebuffer(); <span class="type">void</span> renderToPixmap(); <span class="type">void</span> grabToImage(); <span class="type">void</span> createQuickWidgetsInTabs(<span class="type">QMdiArea</span> <span class="operator">*</span>mdiArea); <span class="keyword">private</span>: <span class="type"><a href="qquickwidget.html">QQuickWidget</a></span> <span class="operator">*</span>m_quickWidget; }; MainWindow<span class="operator">::</span>MainWindow() : m_quickWidget(<span class="keyword">new</span> <span class="type"><a href="qquickwidget.html">QQuickWidget</a></span>) { <span class="type">QSurfaceFormat</span> format; <span class="keyword">if</span> (<span class="type">QCoreApplication</span><span class="operator">::</span>arguments()<span class="operator">.</span>contains(<span class="type">QStringLiteral</span>(<span class="string">"--coreprofile"</span>))) { format<span class="operator">.</span>setVersion(<span class="number">4</span><span class="operator">,</span> <span class="number">4</span>); format<span class="operator">.</span>setProfile(<span class="type">QSurfaceFormat</span><span class="operator">::</span>CoreProfile); } <span class="keyword">if</span> (<span class="type">QCoreApplication</span><span class="operator">::</span>arguments()<span class="operator">.</span>contains(<span class="type">QStringLiteral</span>(<span class="string">"--multisample"</span>))) format<span class="operator">.</span>setSamples(<span class="number">4</span>); m_quickWidget<span class="operator">-</span><span class="operator">></span>setFormat(format); <span class="type">QMdiArea</span> <span class="operator">*</span>centralWidget <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QMdiArea</span>; <span class="type">QLCDNumber</span> <span class="operator">*</span>lcd <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QLCDNumber</span>; lcd<span class="operator">-</span><span class="operator">></span>display(<span class="number">1337</span>); lcd<span class="operator">-</span><span class="operator">></span>setMinimumSize(<span class="number">250</span><span class="operator">,</span><span class="number">100</span>); centralWidget<span class="operator">-</span><span class="operator">></span>addSubWindow(lcd); <span class="type">QUrl</span> source(<span class="string">"qrc:quickwidget/rotatingsquare.qml"</span>); connect(m_quickWidget<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qquickwidget.html">QQuickWidget</a></span><span class="operator">::</span>statusChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>quickWidgetStatusChanged); connect(m_quickWidget<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qquickwidget.html">QQuickWidget</a></span><span class="operator">::</span>sceneGraphError<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>sceneGraphError); m_quickWidget<span class="operator">-</span><span class="operator">></span>resize(<span class="number">300</span><span class="operator">,</span><span class="number">300</span>); m_quickWidget<span class="operator">-</span><span class="operator">></span>setResizeMode(<span class="type"><a href="qquickwidget.html">QQuickWidget</a></span><span class="operator">::</span>SizeRootObjectToView ); m_quickWidget<span class="operator">-</span><span class="operator">></span>setSource(source); centralWidget<span class="operator">-</span><span class="operator">></span>addSubWindow(m_quickWidget); setCentralWidget(centralWidget); <span class="type">QMenu</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">"Grab framebuffer"</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>grabFramebuffer); fileMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"Render to pixmap"</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>renderToPixmap); fileMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"Grab via grabToImage"</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>grabToImage); fileMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"Quit"</span>)<span class="operator">,</span> qApp<span class="operator">,</span> <span class="operator">&</span><span class="type">QCoreApplication</span><span class="operator">::</span>quit); <span class="type">QMenu</span> <span class="operator">*</span>windowMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"&Window"</span>)); windowMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"Add tab widget"</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">[</span><span class="keyword">this</span><span class="operator">,</span> centralWidget<span class="operator">]</span> { createQuickWidgetsInTabs(centralWidget); }); } <span class="type">void</span> MainWindow<span class="operator">::</span>createQuickWidgetsInTabs(<span class="type">QMdiArea</span> <span class="operator">*</span>mdiArea) { <span class="type">QTabWidget</span> <span class="operator">*</span>tabWidget <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QTabWidget</span>; <span class="keyword">const</span> <span class="type">QSize</span> size(<span class="number">400</span><span class="operator">,</span> <span class="number">400</span>); <span class="type"><a href="qquickwidget.html">QQuickWidget</a></span> <span class="operator">*</span>w <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qquickwidget.html">QQuickWidget</a></span>; w<span class="operator">-</span><span class="operator">></span>resize(size); w<span class="operator">-</span><span class="operator">></span>setResizeMode(<span class="type"><a href="qquickwidget.html">QQuickWidget</a></span><span class="operator">::</span>SizeRootObjectToView); w<span class="operator">-</span><span class="operator">></span>setSource(<span class="type">QUrl</span>(<span class="string">"qrc:quickwidget/rotatingsquaretab.qml"</span>)); tabWidget<span class="operator">-</span><span class="operator">></span>addTab(w<span class="operator">,</span> tr(<span class="string">"Plain Quick content"</span>)); w <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qquickwidget.html">QQuickWidget</a></span>; w<span class="operator">-</span><span class="operator">></span>resize(size); w<span class="operator">-</span><span class="operator">></span>setResizeMode(<span class="type"><a href="qquickwidget.html">QQuickWidget</a></span><span class="operator">::</span>SizeRootObjectToView); w<span class="operator">-</span><span class="operator">></span>setSource(<span class="type">QUrl</span>(<span class="string">"qrc:quickwidget/customgl.qml"</span>)); tabWidget<span class="operator">-</span><span class="operator">></span>addTab(w<span class="operator">,</span> tr(<span class="string">"Custom OpenGL drawing"</span>)); mdiArea<span class="operator">-</span><span class="operator">></span>addSubWindow(tabWidget); tabWidget<span class="operator">-</span><span class="operator">></span>show(); } <span class="type">void</span> MainWindow<span class="operator">::</span>quickWidgetStatusChanged(<span class="type"><a href="qquickwidget.html">QQuickWidget</a></span><span class="operator">::</span>Status status) { <span class="keyword">if</span> (status <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qquickwidget.html">QQuickWidget</a></span><span class="operator">::</span>Error) { <span class="type">QStringList</span> errors; <span class="keyword">const</span> <span class="keyword">auto</span> widgetErrors <span class="operator">=</span> m_quickWidget<span class="operator">-</span><span class="operator">></span>errors(); <span class="keyword">for</span> (<span class="keyword">const</span> <span class="type">QQmlError</span> <span class="operator">&</span>error : widgetErrors) errors<span class="operator">.</span>append(error<span class="operator">.</span>toString()); statusBar()<span class="operator">-</span><span class="operator">></span>showMessage(errors<span class="operator">.</span>join(<span class="type">QStringLiteral</span>(<span class="string">", "</span>))); } } <span class="type">void</span> MainWindow<span class="operator">::</span>sceneGraphError(<span class="type"><a href="qquickwindow.html">QQuickWindow</a></span><span class="operator">::</span>SceneGraphError<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>message) { statusBar()<span class="operator">-</span><span class="operator">></span>showMessage(message); } <span class="keyword">template</span><span class="operator"><</span><span class="keyword">class</span> T<span class="operator">></span> <span class="type">void</span> saveToFile(<span class="type">QWidget</span> <span class="operator">*</span>parent<span class="operator">,</span> T <span class="operator">*</span>saveable) { <span class="type">QFileDialog</span> fd(parent); fd<span class="operator">.</span>setAcceptMode(<span class="type">QFileDialog</span><span class="operator">::</span>AcceptSave); fd<span class="operator">.</span>setDefaultSuffix(<span class="string">"png"</span>); fd<span class="operator">.</span>selectFile(<span class="string">"test.png"</span>); <span class="keyword">if</span> (fd<span class="operator">.</span>exec() <span class="operator">=</span><span class="operator">=</span> <span class="type">QDialog</span><span class="operator">::</span>Accepted) saveable<span class="operator">-</span><span class="operator">></span>save(fd<span class="operator">.</span>selectedFiles()<span class="operator">.</span>first()); } <span class="type">void</span> MainWindow<span class="operator">::</span>grabFramebuffer() { <span class="type">QImage</span> image <span class="operator">=</span> m_quickWidget<span class="operator">-</span><span class="operator">></span>grabFramebuffer(); saveToFile(<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>image); } <span class="type">void</span> MainWindow<span class="operator">::</span>renderToPixmap() { <span class="type">QPixmap</span> pixmap(m_quickWidget<span class="operator">-</span><span class="operator">></span>size()); m_quickWidget<span class="operator">-</span><span class="operator">></span>render(<span class="operator">&</span>pixmap); saveToFile(<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>pixmap); } <span class="type">void</span> MainWindow<span class="operator">::</span>grabToImage() { <span class="type">QFileDialog</span> fd(<span class="keyword">this</span>); fd<span class="operator">.</span>setAcceptMode(<span class="type">QFileDialog</span><span class="operator">::</span>AcceptSave); fd<span class="operator">.</span>setDefaultSuffix(<span class="string">"png"</span>); fd<span class="operator">.</span>selectFile(<span class="string">"test_grabToImage.png"</span>); <span class="keyword">if</span> (fd<span class="operator">.</span>exec() <span class="operator">=</span><span class="operator">=</span> <span class="type">QDialog</span><span class="operator">::</span>Accepted) { <span class="type">QMetaObject</span><span class="operator">::</span>invokeMethod(m_quickWidget<span class="operator">-</span><span class="operator">></span>rootObject()<span class="operator">,</span> <span class="string">"performLayerBasedGrab"</span><span class="operator">,</span> Q_ARG(<span class="type">QVariant</span><span class="operator">,</span> fd<span class="operator">.</span>selectedFiles()<span class="operator">.</span>first())); } } <span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span><span class="operator">*</span>argv) { <span class="type">QApplication</span> app(argc<span class="operator">,</span> argv); qmlRegisterType<span class="operator"><</span>FbItem<span class="operator">></span>(<span class="string">"QuickWidgetExample"</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="string">"FbItem"</span>); MainWindow mainWindow; mainWindow<span class="operator">.</span>show(); <span class="keyword">return</span> app<span class="operator">.</span>exec(); } <span class="preprocessor">#include "main.moc"</span> </pre> </div> <!-- @@@quickwidgets/quickwidget/main.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>