<?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 5.12.6</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-widgets-charactermap-example.html">Character Map 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 5.12.6 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">widgets/charactermap/mainwindow.cpp</span> <!-- $$$widgets/charactermap/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 "characterwidget.h"</span> <span class="preprocessor">#include "mainwindow.h"</span> Q_DECLARE_METATYPE(<span class="type"><a href="qfontcombobox.html">QFontComboBox</a></span><span class="operator">::</span>FontFilter) MainWindow<span class="operator">::</span>MainWindow() { <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">"Quit"</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">::</span>close); <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(tr(<span class="string">"&Help"</span>)); helpMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"Show Font Info"</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>showInfo); helpMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"About &Qt"</span>)<span class="operator">,</span> <a href="qapplication.html#qApp">qApp</a><span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>aboutQt); <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>centralWidget <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qwidget.html">QWidget</a></span>; <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>filterLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"Filter:"</span>)); filterCombo <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcombobox.html">QComboBox</a></span>; filterCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"All"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">::</span>fromValue(<span class="type"><a href="qfontcombobox.html">QFontComboBox</a></span><span class="operator">::</span>AllFonts)); filterCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Scalable"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">::</span>fromValue(<span class="type"><a href="qfontcombobox.html">QFontComboBox</a></span><span class="operator">::</span>ScalableFonts)); filterCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Monospaced"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">::</span>fromValue(<span class="type"><a href="qfontcombobox.html">QFontComboBox</a></span><span class="operator">::</span>MonospacedFonts)); filterCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Proportional"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">::</span>fromValue(<span class="type"><a href="qfontcombobox.html">QFontComboBox</a></span><span class="operator">::</span>ProportionalFonts)); filterCombo<span class="operator">-</span><span class="operator">></span>setCurrentIndex(<span class="number">0</span>); connect(filterCombo<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type"><a href="qcombobox.html">QComboBox</a></span><span class="operator">::</span>currentIndexChanged)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>filterChanged); <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>fontLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"Font:"</span>)); fontCombo <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qfontcombobox.html">QFontComboBox</a></span>; <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>sizeLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"Size:"</span>)); sizeCombo <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcombobox.html">QComboBox</a></span>; <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>styleLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"Style:"</span>)); styleCombo <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcombobox.html">QComboBox</a></span>; <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>fontMergingLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"Automatic Font Merging:"</span>)); fontMerging <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcheckbox.html">QCheckBox</a></span>; fontMerging<span class="operator">-</span><span class="operator">></span>setChecked(<span class="keyword">true</span>); scrollArea <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qscrollarea.html">QScrollArea</a></span>; characterWidget <span class="operator">=</span> <span class="keyword">new</span> CharacterWidget; scrollArea<span class="operator">-</span><span class="operator">></span>setWidget(characterWidget); findStyles(fontCombo<span class="operator">-</span><span class="operator">></span>currentFont()); findSizes(fontCombo<span class="operator">-</span><span class="operator">></span>currentFont()); lineEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineedit.html">QLineEdit</a></span>; lineEdit<span class="operator">-</span><span class="operator">></span>setClearButtonEnabled(<span class="keyword">true</span>); <span class="preprocessor">#ifndef QT_NO_CLIPBOARD</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>clipboardButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(tr(<span class="string">"&To clipboard"</span>)); <span class="preprocessor">#endif</span> connect(fontCombo<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qfontcombobox.html">QFontComboBox</a></span><span class="operator">::</span>currentFontChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>findStyles); connect(fontCombo<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qfontcombobox.html">QFontComboBox</a></span><span class="operator">::</span>currentFontChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>findSizes); connect(fontCombo<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qfontcombobox.html">QFontComboBox</a></span><span class="operator">::</span>currentFontChanged<span class="operator">,</span> characterWidget<span class="operator">,</span> <span class="operator">&</span>CharacterWidget<span class="operator">::</span>updateFont); connect(sizeCombo<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span><span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type"><a href="qcombobox.html">QComboBox</a></span><span class="operator">::</span>currentIndexChanged)<span class="operator">,</span> characterWidget<span class="operator">,</span> <span class="operator">&</span>CharacterWidget<span class="operator">::</span>updateSize); connect(styleCombo<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span><span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type"><a href="qcombobox.html">QComboBox</a></span><span class="operator">::</span>currentIndexChanged)<span class="operator">,</span> characterWidget<span class="operator">,</span> <span class="operator">&</span>CharacterWidget<span class="operator">::</span>updateStyle); connect(characterWidget<span class="operator">,</span> <span class="operator">&</span>CharacterWidget<span class="operator">::</span>characterSelected<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>insertCharacter); <span class="preprocessor">#ifndef QT_NO_CLIPBOARD</span> connect(clipboardButton<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qabstractbutton.html">QAbstractButton</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>updateClipboard); <span class="preprocessor">#endif</span> connect(fontMerging<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qabstractbutton.html">QAbstractButton</a></span><span class="operator">::</span>toggled<span class="operator">,</span> characterWidget<span class="operator">,</span> <span class="operator">&</span>CharacterWidget<span class="operator">::</span>updateFontMerging); <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span> <span class="operator">*</span>controlsLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span>; controlsLayout<span class="operator">-</span><span class="operator">></span>addWidget(filterLabel); controlsLayout<span class="operator">-</span><span class="operator">></span>addWidget(filterCombo<span class="operator">,</span> <span class="number">1</span>); controlsLayout<span class="operator">-</span><span class="operator">></span>addWidget(fontLabel); controlsLayout<span class="operator">-</span><span class="operator">></span>addWidget(fontCombo<span class="operator">,</span> <span class="number">1</span>); controlsLayout<span class="operator">-</span><span class="operator">></span>addWidget(sizeLabel); controlsLayout<span class="operator">-</span><span class="operator">></span>addWidget(sizeCombo<span class="operator">,</span> <span class="number">1</span>); controlsLayout<span class="operator">-</span><span class="operator">></span>addWidget(styleLabel); controlsLayout<span class="operator">-</span><span class="operator">></span>addWidget(styleCombo<span class="operator">,</span> <span class="number">1</span>); controlsLayout<span class="operator">-</span><span class="operator">></span>addWidget(fontMergingLabel); controlsLayout<span class="operator">-</span><span class="operator">></span>addWidget(fontMerging<span class="operator">,</span> <span class="number">1</span>); controlsLayout<span class="operator">-</span><span class="operator">></span>addStretch(<span class="number">1</span>); <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span> <span class="operator">*</span>lineLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span>; lineLayout<span class="operator">-</span><span class="operator">></span>addWidget(lineEdit<span class="operator">,</span> <span class="number">1</span>); lineLayout<span class="operator">-</span><span class="operator">></span>addSpacing(<span class="number">12</span>); <span class="preprocessor">#ifndef QT_NO_CLIPBOARD</span> lineLayout<span class="operator">-</span><span class="operator">></span>addWidget(clipboardButton); <span class="preprocessor">#endif</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>centralLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>; centralLayout<span class="operator">-</span><span class="operator">></span>addLayout(controlsLayout); centralLayout<span class="operator">-</span><span class="operator">></span>addWidget(scrollArea<span class="operator">,</span> <span class="number">1</span>); centralLayout<span class="operator">-</span><span class="operator">></span>addSpacing(<span class="number">4</span>); centralLayout<span class="operator">-</span><span class="operator">></span>addLayout(lineLayout); centralWidget<span class="operator">-</span><span class="operator">></span>setLayout(centralLayout); setCentralWidget(centralWidget); setWindowTitle(tr(<span class="string">"Character Map"</span>)); } <span class="type">void</span> MainWindow<span class="operator">::</span>findStyles(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qfont.html">QFont</a></span> <span class="operator">&</span>font) { <span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span> fontDatabase; <span class="type"><a href="../qtcore/qstring.html">QString</a></span> currentItem <span class="operator">=</span> styleCombo<span class="operator">-</span><span class="operator">></span>currentText(); styleCombo<span class="operator">-</span><span class="operator">></span>clear(); <span class="type"><a href="../qtcore/qstring.html">QString</a></span> style; foreach (style<span class="operator">,</span> fontDatabase<span class="operator">.</span>styles(font<span class="operator">.</span>family())) styleCombo<span class="operator">-</span><span class="operator">></span>addItem(style); <span class="type">int</span> styleIndex <span class="operator">=</span> styleCombo<span class="operator">-</span><span class="operator">></span>findText(currentItem); <span class="keyword">if</span> (styleIndex <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) styleCombo<span class="operator">-</span><span class="operator">></span>setCurrentIndex(<span class="number">0</span>); <span class="keyword">else</span> styleCombo<span class="operator">-</span><span class="operator">></span>setCurrentIndex(styleIndex); } <span class="type">void</span> MainWindow<span class="operator">::</span>filterChanged(<span class="type">int</span> f) { <span class="keyword">const</span> <span class="type"><a href="qfontcombobox.html">QFontComboBox</a></span><span class="operator">::</span>FontFilter filter <span class="operator">=</span> filterCombo<span class="operator">-</span><span class="operator">></span>itemData(f)<span class="operator">.</span>value<span class="operator"><</span><span class="type"><a href="qfontcombobox.html">QFontComboBox</a></span><span class="operator">::</span>FontFilter<span class="operator">></span>(); fontCombo<span class="operator">-</span><span class="operator">></span>setFontFilters(filter); statusBar()<span class="operator">-</span><span class="operator">></span>showMessage(tr(<span class="string">"%n font(s) found"</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> fontCombo<span class="operator">-</span><span class="operator">></span>count())); } <span class="type">void</span> MainWindow<span class="operator">::</span>findSizes(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qfont.html">QFont</a></span> <span class="operator">&</span>font) { <span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span> fontDatabase; <span class="type"><a href="../qtcore/qstring.html">QString</a></span> currentSize <span class="operator">=</span> sizeCombo<span class="operator">-</span><span class="operator">></span>currentText(); { <span class="keyword">const</span> <span class="type"><a href="../qtcore/qsignalblocker.html">QSignalBlocker</a></span> blocker(sizeCombo); <span class="comment">// sizeCombo signals are now blocked until end of scope</span> sizeCombo<span class="operator">-</span><span class="operator">></span>clear(); <span class="type">int</span> size; <span class="keyword">if</span> (fontDatabase<span class="operator">.</span>isSmoothlyScalable(font<span class="operator">.</span>family()<span class="operator">,</span> fontDatabase<span class="operator">.</span>styleString(font))) { foreach (size<span class="operator">,</span> <span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span><span class="operator">::</span>standardSizes()) { sizeCombo<span class="operator">-</span><span class="operator">></span>addItem(<span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(size)<span class="operator">.</span>toString()); sizeCombo<span class="operator">-</span><span class="operator">></span>setEditable(<span class="keyword">true</span>); } } <span class="keyword">else</span> { foreach (size<span class="operator">,</span> fontDatabase<span class="operator">.</span>smoothSizes(font<span class="operator">.</span>family()<span class="operator">,</span> fontDatabase<span class="operator">.</span>styleString(font))) { sizeCombo<span class="operator">-</span><span class="operator">></span>addItem(<span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(size)<span class="operator">.</span>toString()); sizeCombo<span class="operator">-</span><span class="operator">></span>setEditable(<span class="keyword">false</span>); } } } <span class="type">int</span> sizeIndex <span class="operator">=</span> sizeCombo<span class="operator">-</span><span class="operator">></span>findText(currentSize); <span class="keyword">if</span>(sizeIndex <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) sizeCombo<span class="operator">-</span><span class="operator">></span>setCurrentIndex(<a href="../qtcore/qtglobal.html#qMax">qMax</a>(<span class="number">0</span><span class="operator">,</span> sizeCombo<span class="operator">-</span><span class="operator">></span>count() <span class="operator">/</span> <span class="number">3</span>)); <span class="keyword">else</span> sizeCombo<span class="operator">-</span><span class="operator">></span>setCurrentIndex(sizeIndex); } <span class="type">void</span> MainWindow<span class="operator">::</span>insertCharacter(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>character) { lineEdit<span class="operator">-</span><span class="operator">></span>insert(character); } <span class="preprocessor">#ifndef QT_NO_CLIPBOARD</span> <span class="type">void</span> MainWindow<span class="operator">::</span>updateClipboard() { <span class="type"><a href="../qtgui/qguiapplication.html">QGuiApplication</a></span><span class="operator">::</span>clipboard()<span class="operator">-</span><span class="operator">></span>setText(lineEdit<span class="operator">-</span><span class="operator">></span>text()<span class="operator">,</span> <span class="type"><a href="../qtgui/qclipboard.html">QClipboard</a></span><span class="operator">::</span>Clipboard); <span class="type"><a href="../qtgui/qguiapplication.html">QGuiApplication</a></span><span class="operator">::</span>clipboard()<span class="operator">-</span><span class="operator">></span>setText(lineEdit<span class="operator">-</span><span class="operator">></span>text()<span class="operator">,</span> <span class="type"><a href="../qtgui/qclipboard.html">QClipboard</a></span><span class="operator">::</span>Selection); } <span class="preprocessor">#endif</span> <span class="keyword">class</span> FontInfoDialog : <span class="keyword">public</span> <span class="type"><a href="qdialog.html">QDialog</a></span> { <span class="keyword">public</span>: <span class="keyword">explicit</span> FontInfoDialog(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> nullptr); <span class="keyword">private</span>: <span class="type"><a href="../qtcore/qstring.html">QString</a></span> text() <span class="keyword">const</span>; }; FontInfoDialog<span class="operator">::</span>FontInfoDialog(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="qdialog.html">QDialog</a></span>(parent) { setWindowFlags(windowFlags() <span class="operator">&</span> <span class="operator">~</span><span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WindowContextHelpButtonHint); <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>(<span class="keyword">this</span>); <span class="type"><a href="qplaintextedit.html">QPlainTextEdit</a></span> <span class="operator">*</span>textEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qplaintextedit.html">QPlainTextEdit</a></span>(text()<span class="operator">,</span> <span class="keyword">this</span>); textEdit<span class="operator">-</span><span class="operator">></span>setReadOnly(<span class="keyword">true</span>); textEdit<span class="operator">-</span><span class="operator">></span>setFont(<span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span><span class="operator">::</span>systemFont(<span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span><span class="operator">::</span>FixedFont)); mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(textEdit); <span class="type"><a href="qdialogbuttonbox.html">QDialogButtonBox</a></span> <span class="operator">*</span>buttonBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qdialogbuttonbox.html">QDialogButtonBox</a></span>(<span class="type"><a href="qdialogbuttonbox.html">QDialogButtonBox</a></span><span class="operator">::</span>Close<span class="operator">,</span> <span class="keyword">this</span>); connect(buttonBox<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qdialogbuttonbox.html">QDialogButtonBox</a></span><span class="operator">::</span>rejected<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qdialog.html">QDialog</a></span><span class="operator">::</span>reject); mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(buttonBox); } <span class="type"><a href="../qtcore/qstring.html">QString</a></span> FontInfoDialog<span class="operator">::</span>text() <span class="keyword">const</span> { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> text; <span class="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> str(<span class="operator">&</span>text); <span class="keyword">const</span> <span class="type"><a href="../qtgui/qfont.html">QFont</a></span> defaultFont <span class="operator">=</span> <span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span><span class="operator">::</span>systemFont(<span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span><span class="operator">::</span>GeneralFont); <span class="keyword">const</span> <span class="type"><a href="../qtgui/qfont.html">QFont</a></span> fixedFont <span class="operator">=</span> <span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span><span class="operator">::</span>systemFont(<span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span><span class="operator">::</span>FixedFont); <span class="keyword">const</span> <span class="type"><a href="../qtgui/qfont.html">QFont</a></span> titleFont <span class="operator">=</span> <span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span><span class="operator">::</span>systemFont(<span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span><span class="operator">::</span>TitleFont); <span class="keyword">const</span> <span class="type"><a href="../qtgui/qfont.html">QFont</a></span> smallestReadableFont <span class="operator">=</span> <span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span><span class="operator">::</span>systemFont(<span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span><span class="operator">::</span>SmallestReadableFont); str <span class="operator"><</span><span class="operator"><</span> <span class="string">"Qt "</span> <span class="operator"><</span><span class="operator"><</span> QT_VERSION_STR <span class="operator"><</span><span class="operator"><</span> <span class="string">" on "</span> <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qguiapplication.html">QGuiApplication</a></span><span class="operator">::</span>platformName() <span class="operator"><</span><span class="operator"><</span> <span class="string">", "</span> <span class="operator"><</span><span class="operator"><</span> logicalDpiX() <span class="operator"><</span><span class="operator"><</span> <span class="string">"DPI"</span>; <span class="keyword">if</span> (<span class="operator">!</span><a href="../qtcore/qtglobal.html#qFuzzyCompare">qFuzzyCompare</a>(devicePixelRatioF()<span class="operator">,</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span>(<span class="number">1</span>))) str <span class="operator"><</span><span class="operator"><</span> <span class="string">", device pixel ratio: "</span> <span class="operator"><</span><span class="operator"><</span> devicePixelRatioF(); str <span class="operator"><</span><span class="operator"><</span> <span class="string">"\n\nDefault font : "</span> <span class="operator"><</span><span class="operator"><</span> defaultFont<span class="operator">.</span>family() <span class="operator"><</span><span class="operator"><</span> <span class="string">", "</span> <span class="operator"><</span><span class="operator"><</span> defaultFont<span class="operator">.</span>pointSizeF() <span class="operator"><</span><span class="operator"><</span> <span class="string">"pt\n"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"Fixed font : "</span> <span class="operator"><</span><span class="operator"><</span> fixedFont<span class="operator">.</span>family() <span class="operator"><</span><span class="operator"><</span> <span class="string">", "</span> <span class="operator"><</span><span class="operator"><</span> fixedFont<span class="operator">.</span>pointSizeF() <span class="operator"><</span><span class="operator"><</span> <span class="string">"pt\n"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"Title font : "</span> <span class="operator"><</span><span class="operator"><</span> titleFont<span class="operator">.</span>family() <span class="operator"><</span><span class="operator"><</span> <span class="string">", "</span> <span class="operator"><</span><span class="operator"><</span> titleFont<span class="operator">.</span>pointSizeF() <span class="operator"><</span><span class="operator"><</span> <span class="string">"pt\n"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"Smallest font: "</span> <span class="operator"><</span><span class="operator"><</span> smallestReadableFont<span class="operator">.</span>family() <span class="operator"><</span><span class="operator"><</span> <span class="string">", "</span> <span class="operator"><</span><span class="operator"><</span> smallestReadableFont<span class="operator">.</span>pointSizeF() <span class="operator"><</span><span class="operator"><</span> <span class="string">"pt\n"</span>; <span class="keyword">return</span> text; } <span class="type">void</span> MainWindow<span class="operator">::</span>showInfo() { <span class="keyword">const</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> screenGeometry <span class="operator">=</span> <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>desktop()<span class="operator">-</span><span class="operator">></span>screenGeometry(<span class="keyword">this</span>); FontInfoDialog <span class="operator">*</span>dialog <span class="operator">=</span> <span class="keyword">new</span> FontInfoDialog(<span class="keyword">this</span>); dialog<span class="operator">-</span><span class="operator">></span>setWindowTitle(tr(<span class="string">"Fonts"</span>)); dialog<span class="operator">-</span><span class="operator">></span>setAttribute(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WA_DeleteOnClose); dialog<span class="operator">-</span><span class="operator">></span>resize(screenGeometry<span class="operator">.</span>width() <span class="operator">/</span> <span class="number">4</span><span class="operator">,</span> screenGeometry<span class="operator">.</span>height() <span class="operator">/</span> <span class="number">4</span>); dialog<span class="operator">-</span><span class="operator">></span>show(); } </pre> </div> <!-- @@@widgets/charactermap/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>