<?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 5.12.2</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 5.12</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-painting-fontsampler-example.html">Font Sampler Example</a></td><td >mainwindow.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtwidgets-index.html">Qt 5.12.2 Reference Documentation</a></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">painting/fontsampler/mainwindow.cpp</span> <!-- $$$painting/fontsampler/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">#if defined(QT_PRINTSUPPORT_LIB)</span> <span class="preprocessor">#include <QtPrintSupport/qtprintsupportglobal.h></span> <span class="preprocessor">#if QT_CONFIG(printdialog)</span> <span class="preprocessor">#include <QPrinter></span> <span class="preprocessor">#include <QPrintDialog></span> <span class="preprocessor">#if QT_CONFIG(printpreviewdialog)</span> <span class="preprocessor">#include <QPrintPreviewDialog></span> <span class="preprocessor">#endif</span> <span class="preprocessor">#endif</span> <span class="preprocessor">#endif</span> <span class="preprocessor">#include "mainwindow.h"</span> MainWindow<span class="operator">::</span>MainWindow(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="qmainwindow.html">QMainWindow</a></span>(parent) { setupUi(<span class="keyword">this</span>); sampleSizes <span class="operator"><</span><span class="operator"><</span> <span class="number">32</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">24</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">16</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">14</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">12</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">8</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">4</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">2</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">1</span>; markedCount <span class="operator">=</span> <span class="number">0</span>; setupFontTree(); connect(quitAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <a href="qapplication.html#qApp">qApp</a><span class="operator">,</span> SLOT(quit())); connect(fontTree<span class="operator">,</span> SIGNAL(currentItemChanged(<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span><span class="operator">*</span><span class="operator">,</span><span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span><span class="operator">*</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(showFont(<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span><span class="operator">*</span>))); connect(fontTree<span class="operator">,</span> SIGNAL(itemChanged(<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span><span class="operator">*</span><span class="operator">,</span><span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateStyles(<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span><span class="operator">*</span><span class="operator">,</span><span class="type">int</span>))); fontTree<span class="operator">-</span><span class="operator">></span>setItemSelected(fontTree<span class="operator">-</span><span class="operator">></span>topLevelItem(<span class="number">0</span>)<span class="operator">,</span> <span class="keyword">true</span>); showFont(fontTree<span class="operator">-</span><span class="operator">></span>topLevelItem(<span class="number">0</span>)); } <span class="type">void</span> MainWindow<span class="operator">::</span>setupFontTree() { <span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span> database; fontTree<span class="operator">-</span><span class="operator">></span>setColumnCount(<span class="number">1</span>); fontTree<span class="operator">-</span><span class="operator">></span>setHeaderLabels(<span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span>() <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Font"</span>)); foreach (<span class="type"><a href="../qtcore/qstring.html">QString</a></span> family<span class="operator">,</span> database<span class="operator">.</span>families()) { <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> styles <span class="operator">=</span> database<span class="operator">.</span>styles(family); <span class="keyword">if</span> (styles<span class="operator">.</span>isEmpty()) <span class="keyword">continue</span>; <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>familyItem <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span>(fontTree); familyItem<span class="operator">-</span><span class="operator">></span>setText(<span class="number">0</span><span class="operator">,</span> family); familyItem<span class="operator">-</span><span class="operator">></span>setCheckState(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Unchecked); familyItem<span class="operator">-</span><span class="operator">></span>setFlags(familyItem<span class="operator">-</span><span class="operator">></span>flags() <span class="operator">|</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ItemIsAutoTristate); foreach (<span class="type"><a href="../qtcore/qstring.html">QString</a></span> style<span class="operator">,</span> styles) { <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>styleItem <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span>(familyItem); styleItem<span class="operator">-</span><span class="operator">></span>setText(<span class="number">0</span><span class="operator">,</span> style); styleItem<span class="operator">-</span><span class="operator">></span>setCheckState(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Unchecked); styleItem<span class="operator">-</span><span class="operator">></span>setData(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(database<span class="operator">.</span>weight(family<span class="operator">,</span> style))); styleItem<span class="operator">-</span><span class="operator">></span>setData(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole <span class="operator">+</span> <span class="number">1</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(database<span class="operator">.</span>italic(family<span class="operator">,</span> style))); } } } <span class="type">void</span> MainWindow<span class="operator">::</span>on_clearAction_triggered() { <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>currentItem <span class="operator">=</span> fontTree<span class="operator">-</span><span class="operator">></span>currentItem(); foreach (<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> fontTree<span class="operator">-</span><span class="operator">></span>selectedItems()) fontTree<span class="operator">-</span><span class="operator">></span>setItemSelected(item<span class="operator">,</span> <span class="keyword">false</span>); fontTree<span class="operator">-</span><span class="operator">></span>setItemSelected(currentItem<span class="operator">,</span> <span class="keyword">true</span>); } <span class="type">void</span> MainWindow<span class="operator">::</span>on_markAction_triggered() { markUnmarkFonts(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Checked); } <span class="type">void</span> MainWindow<span class="operator">::</span>on_unmarkAction_triggered() { markUnmarkFonts(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Unchecked); } <span class="type">void</span> MainWindow<span class="operator">::</span>markUnmarkFonts(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>CheckState state) { <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span><span class="operator">></span> items <span class="operator">=</span> fontTree<span class="operator">-</span><span class="operator">></span>selectedItems(); foreach (<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> items) { <span class="keyword">if</span> (item<span class="operator">-</span><span class="operator">></span>checkState(<span class="number">0</span>) <span class="operator">!</span><span class="operator">=</span> state) item<span class="operator">-</span><span class="operator">></span>setCheckState(<span class="number">0</span><span class="operator">,</span> state); } } <span class="type">void</span> MainWindow<span class="operator">::</span>showFont(<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item) { <span class="keyword">if</span> (<span class="operator">!</span>item) <span class="keyword">return</span>; <span class="type"><a href="../qtcore/qstring.html">QString</a></span> family; <span class="type"><a href="../qtcore/qstring.html">QString</a></span> style; <span class="type">int</span> weight; bool italic; <span class="keyword">if</span> (item<span class="operator">-</span><span class="operator">></span>parent()) { family <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>parent()<span class="operator">-</span><span class="operator">></span>text(<span class="number">0</span>); style <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>text(<span class="number">0</span>); weight <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>data(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole)<span class="operator">.</span>toInt(); italic <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>data(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole <span class="operator">+</span> <span class="number">1</span>)<span class="operator">.</span>toBool(); } <span class="keyword">else</span> { family <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>text(<span class="number">0</span>); style <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>child(<span class="number">0</span>)<span class="operator">-</span><span class="operator">></span>text(<span class="number">0</span>); weight <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>child(<span class="number">0</span>)<span class="operator">-</span><span class="operator">></span>data(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole)<span class="operator">.</span>toInt(); italic <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>child(<span class="number">0</span>)<span class="operator">-</span><span class="operator">></span>data(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole <span class="operator">+</span> <span class="number">1</span>)<span class="operator">.</span>toBool(); } <span class="type"><a href="../qtcore/qstring.html">QString</a></span> oldText <span class="operator">=</span> textEdit<span class="operator">-</span><span class="operator">></span>toPlainText()<span class="operator">.</span>trimmed(); bool modified <span class="operator">=</span> textEdit<span class="operator">-</span><span class="operator">></span>document()<span class="operator">-</span><span class="operator">></span>isModified(); textEdit<span class="operator">-</span><span class="operator">></span>clear(); <span class="type"><a href="../qtgui/qfont.html">QFont</a></span> font(family<span class="operator">,</span> <span class="number">32</span><span class="operator">,</span> weight<span class="operator">,</span> italic); font<span class="operator">.</span>setStyleName(style); textEdit<span class="operator">-</span><span class="operator">></span>document()<span class="operator">-</span><span class="operator">></span>setDefaultFont(font); <span class="type"><a href="../qtgui/qtextcursor.html">QTextCursor</a></span> cursor <span class="operator">=</span> textEdit<span class="operator">-</span><span class="operator">></span>textCursor(); <span class="type"><a href="../qtgui/qtextblockformat.html">QTextBlockFormat</a></span> blockFormat; blockFormat<span class="operator">.</span>setAlignment(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AlignCenter); cursor<span class="operator">.</span>insertBlock(blockFormat); <span class="keyword">if</span> (modified) cursor<span class="operator">.</span>insertText(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>(oldText)); <span class="keyword">else</span> cursor<span class="operator">.</span>insertText(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"%1 %2"</span>)<span class="operator">.</span>arg(family)<span class="operator">.</span>arg(style)); textEdit<span class="operator">-</span><span class="operator">></span>document()<span class="operator">-</span><span class="operator">></span>setModified(modified); } <span class="type">void</span> MainWindow<span class="operator">::</span>updateStyles(<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> <span class="type">int</span> column) { <span class="keyword">if</span> (<span class="operator">!</span>item <span class="operator">|</span><span class="operator">|</span> column <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>) <span class="keyword">return</span>; <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>CheckState state <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>checkState(<span class="number">0</span>); <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>parent <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>parent(); <span class="keyword">if</span> (parent) { <span class="comment">// Only count style items.</span> <span class="keyword">if</span> (state <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Checked) <span class="operator">+</span><span class="operator">+</span>markedCount; <span class="keyword">else</span> <span class="operator">-</span><span class="operator">-</span>markedCount; } printAction<span class="operator">-</span><span class="operator">></span>setEnabled(markedCount <span class="operator">></span> <span class="number">0</span>); printPreviewAction<span class="operator">-</span><span class="operator">></span>setEnabled(markedCount <span class="operator">></span> <span class="number">0</span>); } <span class="type"><a href="../qtcore/qmap.html">QMap</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">,</span> StyleItems<span class="operator">></span> MainWindow<span class="operator">::</span>currentPageMap() { <span class="type"><a href="../qtcore/qmap.html">QMap</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">,</span> StyleItems<span class="operator">></span> pageMap; <span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>; row <span class="operator"><</span> fontTree<span class="operator">-</span><span class="operator">></span>topLevelItemCount(); <span class="operator">+</span><span class="operator">+</span>row) { <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>familyItem <span class="operator">=</span> fontTree<span class="operator">-</span><span class="operator">></span>topLevelItem(row); <span class="type"><a href="../qtcore/qstring.html">QString</a></span> family; <span class="keyword">if</span> (familyItem<span class="operator">-</span><span class="operator">></span>checkState(<span class="number">0</span>) <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Checked) { family <span class="operator">=</span> familyItem<span class="operator">-</span><span class="operator">></span>text(<span class="number">0</span>); pageMap<span class="operator">[</span>family<span class="operator">]</span> <span class="operator">=</span> StyleItems(); } <span class="keyword">for</span> (<span class="type">int</span> childRow <span class="operator">=</span> <span class="number">0</span>; childRow <span class="operator"><</span> familyItem<span class="operator">-</span><span class="operator">></span>childCount(); <span class="operator">+</span><span class="operator">+</span>childRow) { <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>styleItem <span class="operator">=</span> familyItem<span class="operator">-</span><span class="operator">></span>child(childRow); <span class="keyword">if</span> (styleItem<span class="operator">-</span><span class="operator">></span>checkState(<span class="number">0</span>) <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Checked) pageMap<span class="operator">[</span>family<span class="operator">]</span><span class="operator">.</span>append(styleItem); } } <span class="keyword">return</span> pageMap; } <span class="type">void</span> MainWindow<span class="operator">::</span>on_printAction_triggered() { <span class="preprocessor">#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog)</span> pageMap <span class="operator">=</span> currentPageMap(); <span class="keyword">if</span> (pageMap<span class="operator">.</span>count() <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) <span class="keyword">return</span>; <span class="type">QPrinter</span> printer(<span class="type">QPrinter</span><span class="operator">::</span>HighResolution); <span class="type">QPrintDialog</span> dialog(<span class="operator">&</span>printer<span class="operator">,</span> <span class="keyword">this</span>); <span class="keyword">if</span> (dialog<span class="operator">.</span>exec() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qdialog.html">QDialog</a></span><span class="operator">::</span>Accepted) <span class="keyword">return</span>; <span class="type">int</span> from <span class="operator">=</span> printer<span class="operator">.</span>fromPage(); <span class="type">int</span> to <span class="operator">=</span> printer<span class="operator">.</span>toPage(); <span class="keyword">if</span> (from <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> to <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span>) printer<span class="operator">.</span>setFromTo(<span class="number">1</span><span class="operator">,</span> pageMap<span class="operator">.</span>keys()<span class="operator">.</span>count()); printDocument(<span class="operator">&</span>printer); <span class="preprocessor">#endif</span> } <span class="type">void</span> MainWindow<span class="operator">::</span>printDocument(<span class="type">QPrinter</span> <span class="operator">*</span>printer) { <span class="preprocessor">#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog)</span> printer<span class="operator">-</span><span class="operator">></span>setFromTo(<span class="number">1</span><span class="operator">,</span> pageMap<span class="operator">.</span>count()); <span class="type"><a href="qprogressdialog.html">QProgressDialog</a></span> progress(tr(<span class="string">"Preparing font samples..."</span>)<span class="operator">,</span> tr(<span class="string">"&Cancel"</span>)<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> pageMap<span class="operator">.</span>count()<span class="operator">,</span> <span class="keyword">this</span>); progress<span class="operator">.</span>setWindowModality(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ApplicationModal); progress<span class="operator">.</span>setWindowTitle(tr(<span class="string">"Font Sampler"</span>)); progress<span class="operator">.</span>setMinimum(printer<span class="operator">-</span><span class="operator">></span>fromPage() <span class="operator">-</span> <span class="number">1</span>); progress<span class="operator">.</span>setMaximum(printer<span class="operator">-</span><span class="operator">></span>toPage()); <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter; painter<span class="operator">.</span>begin(printer); bool firstPage <span class="operator">=</span> <span class="keyword">true</span>; <span class="keyword">for</span> (<span class="type">int</span> page <span class="operator">=</span> printer<span class="operator">-</span><span class="operator">></span>fromPage(); page <span class="operator"><</span><span class="operator">=</span> printer<span class="operator">-</span><span class="operator">></span>toPage(); <span class="operator">+</span><span class="operator">+</span>page) { <span class="keyword">if</span> (<span class="operator">!</span>firstPage) printer<span class="operator">-</span><span class="operator">></span>newPage(); <a href="qapplication.html#qApp">qApp</a><span class="operator">-</span><span class="operator">></span>processEvents(); <span class="keyword">if</span> (progress<span class="operator">.</span>wasCanceled()) <span class="keyword">break</span>; printPage(page <span class="operator">-</span> <span class="number">1</span><span class="operator">,</span> <span class="operator">&</span>painter<span class="operator">,</span> printer); progress<span class="operator">.</span>setValue(page); firstPage <span class="operator">=</span> <span class="keyword">false</span>; } painter<span class="operator">.</span>end(); <span class="preprocessor">#endif</span> } <span class="type">void</span> MainWindow<span class="operator">::</span>on_printPreviewAction_triggered() { <span class="preprocessor">#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printpreviewdialog)</span> pageMap <span class="operator">=</span> currentPageMap(); <span class="keyword">if</span> (pageMap<span class="operator">.</span>count() <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) <span class="keyword">return</span>; <span class="type">QPrinter</span> printer(<span class="type">QPrinter</span><span class="operator">::</span>HighResolution); <span class="type">QPrintPreviewDialog</span> preview(<span class="operator">&</span>printer<span class="operator">,</span> <span class="keyword">this</span>); connect(<span class="operator">&</span>preview<span class="operator">,</span> SIGNAL(paintRequested(<span class="type">QPrinter</span><span class="operator">*</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(printDocument(<span class="type">QPrinter</span><span class="operator">*</span>))); preview<span class="operator">.</span>exec(); <span class="preprocessor">#endif</span> } <span class="type">void</span> MainWindow<span class="operator">::</span>printPage(<span class="type">int</span> index<span class="operator">,</span> <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="type">QPrinter</span> <span class="operator">*</span>printer) { <span class="preprocessor">#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog)</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> family <span class="operator">=</span> pageMap<span class="operator">.</span>keys()<span class="operator">[</span>index<span class="operator">]</span>; StyleItems items <span class="operator">=</span> pageMap<span class="operator">[</span>family<span class="operator">]</span>; <span class="comment">// Find the dimensions of the text on each page.</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> width <span class="operator">=</span> <span class="number">0.0</span>; <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> height <span class="operator">=</span> <span class="number">0.0</span>; foreach (<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> items) { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> style <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>text(<span class="number">0</span>); <span class="type">int</span> weight <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>data(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole)<span class="operator">.</span>toInt(); bool italic <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>data(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole <span class="operator">+</span> <span class="number">1</span>)<span class="operator">.</span>toBool(); <span class="comment">// Calculate the maximum width and total height of the text.</span> foreach (<span class="type">int</span> size<span class="operator">,</span> sampleSizes) { <span class="type"><a href="../qtgui/qfont.html">QFont</a></span> font(family<span class="operator">,</span> size<span class="operator">,</span> weight<span class="operator">,</span> italic); font<span class="operator">.</span>setStyleName(style); font <span class="operator">=</span> <span class="type"><a href="../qtgui/qfont.html">QFont</a></span>(font<span class="operator">,</span> painter<span class="operator">-</span><span class="operator">></span>device()); <span class="type"><a href="../qtgui/qfontmetricsf.html">QFontMetricsF</a></span> fontMetrics(font); <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> rect <span class="operator">=</span> fontMetrics<span class="operator">.</span>boundingRect( <span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"%1 %2"</span>)<span class="operator">.</span>arg(family)<span class="operator">.</span>arg(style)); width <span class="operator">=</span> <a href="../qtcore/qtglobal.html#qMax">qMax</a>(rect<span class="operator">.</span>width()<span class="operator">,</span> width); height <span class="operator">+</span><span class="operator">=</span> rect<span class="operator">.</span>height(); } } <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> xScale <span class="operator">=</span> printer<span class="operator">-</span><span class="operator">></span>pageRect()<span class="operator">.</span>width() <span class="operator">/</span> width; <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> yScale <span class="operator">=</span> printer<span class="operator">-</span><span class="operator">></span>pageRect()<span class="operator">.</span>height() <span class="operator">/</span> height; <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> scale <span class="operator">=</span> <a href="../qtcore/qtglobal.html#qMin">qMin</a>(xScale<span class="operator">,</span> yScale); <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> remainingHeight <span class="operator">=</span> printer<span class="operator">-</span><span class="operator">></span>pageRect()<span class="operator">.</span>height()<span class="operator">/</span>scale <span class="operator">-</span> height; <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> spaceHeight <span class="operator">=</span> (remainingHeight <span class="operator">/</span> <span class="number">4.0</span>) <span class="operator">/</span> (items<span class="operator">.</span>count() <span class="operator">+</span> <span class="number">1</span>); <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> interLineHeight <span class="operator">=</span> (remainingHeight <span class="operator">/</span> <span class="number">4.0</span>) <span class="operator">/</span> (sampleSizes<span class="operator">.</span>count() <span class="operator">*</span> items<span class="operator">.</span>count()); painter<span class="operator">-</span><span class="operator">></span>save(); painter<span class="operator">-</span><span class="operator">></span>translate(printer<span class="operator">-</span><span class="operator">></span>pageRect()<span class="operator">.</span>width() <span class="operator">/</span> <span class="number">2.0</span><span class="operator">,</span> printer<span class="operator">-</span><span class="operator">></span>pageRect()<span class="operator">.</span>height() <span class="operator">/</span> <span class="number">2.0</span>); painter<span class="operator">-</span><span class="operator">></span>scale(scale<span class="operator">,</span> scale); painter<span class="operator">-</span><span class="operator">></span>setBrush(<span class="type"><a href="../qtgui/qbrush.html">QBrush</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black)); <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> x <span class="operator">=</span> <span class="operator">-</span>width <span class="operator">/</span> <span class="number">2.0</span>; <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> y <span class="operator">=</span> <span class="operator">-</span>height <span class="operator">/</span> <span class="number">2.0</span> <span class="operator">-</span> remainingHeight <span class="operator">/</span> <span class="number">4.0</span> <span class="operator">+</span> spaceHeight; foreach (<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> items) { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> style <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>text(<span class="number">0</span>); <span class="type">int</span> weight <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>data(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole)<span class="operator">.</span>toInt(); bool italic <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>data(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole <span class="operator">+</span> <span class="number">1</span>)<span class="operator">.</span>toBool(); <span class="comment">// Draw each line of text.</span> foreach (<span class="type">int</span> size<span class="operator">,</span> sampleSizes) { <span class="type"><a href="../qtgui/qfont.html">QFont</a></span> font(family<span class="operator">,</span> size<span class="operator">,</span> weight<span class="operator">,</span> italic); font<span class="operator">.</span>setStyleName(style); font <span class="operator">=</span> <span class="type"><a href="../qtgui/qfont.html">QFont</a></span>(font<span class="operator">,</span> painter<span class="operator">-</span><span class="operator">></span>device()); <span class="type"><a href="../qtgui/qfontmetricsf.html">QFontMetricsF</a></span> fontMetrics(font); <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> rect <span class="operator">=</span> fontMetrics<span class="operator">.</span>boundingRect(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"%1 %2"</span>)<span class="operator">.</span>arg( font<span class="operator">.</span>family())<span class="operator">.</span>arg(style)); y <span class="operator">+</span><span class="operator">=</span> rect<span class="operator">.</span>height(); painter<span class="operator">-</span><span class="operator">></span>setFont(font); painter<span class="operator">-</span><span class="operator">></span>drawText(<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(x<span class="operator">,</span> y)<span class="operator">,</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"%1 %2"</span>)<span class="operator">.</span>arg(family)<span class="operator">.</span>arg(style)); y <span class="operator">+</span><span class="operator">=</span> interLineHeight; } y <span class="operator">+</span><span class="operator">=</span> spaceHeight; } painter<span class="operator">-</span><span class="operator">></span>restore(); <span class="preprocessor">#endif</span> } </pre> </div> <!-- @@@painting/fontsampler/mainwindow.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 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>