<?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>characterwidget.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 >characterwidget.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">characterwidget.cpp Example File</h1> <span class="subtitle">widgets/charactermap/characterwidget.cpp</span> <!-- $$$widgets/charactermap/characterwidget.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> CharacterWidget<span class="operator">::</span>CharacterWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)<span class="operator">,</span> columns(<span class="number">16</span>)<span class="operator">,</span> lastKey(<span class="operator">-</span><span class="number">1</span>) { calculateSquareSize(); setMouseTracking(<span class="keyword">true</span>); } <span class="type">void</span> CharacterWidget<span class="operator">::</span>updateFont(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qfont.html">QFont</a></span> <span class="operator">&</span>font) { displayFont<span class="operator">.</span>setFamily(font<span class="operator">.</span>family()); calculateSquareSize(); adjustSize(); update(); } <span class="type">void</span> CharacterWidget<span class="operator">::</span>updateSize(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>fontSize) { displayFont<span class="operator">.</span>setPointSize(fontSize<span class="operator">.</span>toInt()); calculateSquareSize(); adjustSize(); update(); } <span class="type">void</span> CharacterWidget<span class="operator">::</span>updateStyle(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>fontStyle) { <span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span> fontDatabase; <span class="keyword">const</span> <span class="type"><a href="../qtgui/qfont.html">QFont</a></span><span class="operator">::</span>StyleStrategy oldStrategy <span class="operator">=</span> displayFont<span class="operator">.</span>styleStrategy(); displayFont <span class="operator">=</span> fontDatabase<span class="operator">.</span>font(displayFont<span class="operator">.</span>family()<span class="operator">,</span> fontStyle<span class="operator">,</span> displayFont<span class="operator">.</span>pointSize()); displayFont<span class="operator">.</span>setStyleStrategy(oldStrategy); calculateSquareSize(); adjustSize(); update(); } <span class="type">void</span> CharacterWidget<span class="operator">::</span>updateFontMerging(bool enable) { <span class="keyword">if</span> (enable) displayFont<span class="operator">.</span>setStyleStrategy(<span class="type"><a href="../qtgui/qfont.html">QFont</a></span><span class="operator">::</span>PreferDefault); <span class="keyword">else</span> displayFont<span class="operator">.</span>setStyleStrategy(<span class="type"><a href="../qtgui/qfont.html">QFont</a></span><span class="operator">::</span>NoFontMerging); adjustSize(); update(); } <span class="type">void</span> CharacterWidget<span class="operator">::</span>calculateSquareSize() { squareSize <span class="operator">=</span> <a href="../qtcore/qtglobal.html#qMax">qMax</a>(<span class="number">16</span><span class="operator">,</span> <span class="number">4</span> <span class="operator">+</span> <span class="type"><a href="../qtgui/qfontmetrics.html">QFontMetrics</a></span>(displayFont<span class="operator">,</span> <span class="keyword">this</span>)<span class="operator">.</span>height()); } <span class="type"><a href="../qtcore/qsize.html">QSize</a></span> CharacterWidget<span class="operator">::</span>sizeHint() <span class="keyword">const</span> { <span class="keyword">return</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(columns<span class="operator">*</span>squareSize<span class="operator">,</span> (<span class="number">65536</span><span class="operator">/</span>columns)<span class="operator">*</span>squareSize); } <span class="type">void</span> CharacterWidget<span class="operator">::</span>mouseMoveEvent(<span class="type"><a href="../qtgui/qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event) { <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> widgetPosition <span class="operator">=</span> mapFromGlobal(event<span class="operator">-</span><span class="operator">></span>globalPos()); <span class="type"><a href="../qtcore/qtglobal.html#uint-typedef">uint</a></span> key <span class="operator">=</span> (widgetPosition<span class="operator">.</span>y()<span class="operator">/</span>squareSize)<span class="operator">*</span>columns <span class="operator">+</span> widgetPosition<span class="operator">.</span>x()<span class="operator">/</span>squareSize; <span class="type"><a href="../qtcore/qstring.html">QString</a></span> text <span class="operator">=</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>fromLatin1(<span class="string">"<p>Character: <span style=\"font-size: 24pt; font-family: %1\">"</span>)<span class="operator">.</span>arg(displayFont<span class="operator">.</span>family()) <span class="operator">+</span> <span class="type"><a href="../qtcore/qchar.html">QChar</a></span>(key) <span class="operator">+</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>fromLatin1(<span class="string">"</span><p>Value: 0x"</span>) <span class="operator">+</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>number(key<span class="operator">,</span> <span class="number">16</span>); <span class="type"><a href="qtooltip.html">QToolTip</a></span><span class="operator">::</span>showText(event<span class="operator">-</span><span class="operator">></span>globalPos()<span class="operator">,</span> text<span class="operator">,</span> <span class="keyword">this</span>); } <span class="type">void</span> CharacterWidget<span class="operator">::</span>mousePressEvent(<span class="type"><a href="../qtgui/qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event) { <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>button() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>LeftButton) { lastKey <span class="operator">=</span> (event<span class="operator">-</span><span class="operator">></span>y()<span class="operator">/</span>squareSize)<span class="operator">*</span>columns <span class="operator">+</span> event<span class="operator">-</span><span class="operator">></span>x()<span class="operator">/</span>squareSize; <span class="keyword">if</span> (<span class="type"><a href="../qtcore/qchar.html">QChar</a></span>(lastKey)<span class="operator">.</span>category() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qchar.html">QChar</a></span><span class="operator">::</span>Other_NotAssigned) <span class="keyword">emit</span> characterSelected(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="type"><a href="../qtcore/qchar.html">QChar</a></span>(lastKey))); update(); } <span class="keyword">else</span> <span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">::</span>mousePressEvent(event); } <span class="type">void</span> CharacterWidget<span class="operator">::</span>paintEvent(<span class="type"><a href="../qtgui/qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event) { <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="keyword">this</span>); painter<span class="operator">.</span>fillRect(event<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">,</span> <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>white)); painter<span class="operator">.</span>setFont(displayFont); <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> redrawRect <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>rect(); <span class="type">int</span> beginRow <span class="operator">=</span> redrawRect<span class="operator">.</span>top()<span class="operator">/</span>squareSize; <span class="type">int</span> endRow <span class="operator">=</span> redrawRect<span class="operator">.</span>bottom()<span class="operator">/</span>squareSize; <span class="type">int</span> beginColumn <span class="operator">=</span> redrawRect<span class="operator">.</span>left()<span class="operator">/</span>squareSize; <span class="type">int</span> endColumn <span class="operator">=</span> redrawRect<span class="operator">.</span>right()<span class="operator">/</span>squareSize; painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtgui/qpen.html">QPen</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>gray)); <span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> beginRow; row <span class="operator"><</span><span class="operator">=</span> endRow; <span class="operator">+</span><span class="operator">+</span>row) { <span class="keyword">for</span> (<span class="type">int</span> column <span class="operator">=</span> beginColumn; column <span class="operator"><</span><span class="operator">=</span> endColumn; <span class="operator">+</span><span class="operator">+</span>column) { painter<span class="operator">.</span>drawRect(column<span class="operator">*</span>squareSize<span class="operator">,</span> row<span class="operator">*</span>squareSize<span class="operator">,</span> squareSize<span class="operator">,</span> squareSize); } } <span class="type"><a href="../qtgui/qfontmetrics.html">QFontMetrics</a></span> fontMetrics(displayFont); painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtgui/qpen.html">QPen</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black)); <span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> beginRow; row <span class="operator"><</span><span class="operator">=</span> endRow; <span class="operator">+</span><span class="operator">+</span>row) { <span class="keyword">for</span> (<span class="type">int</span> column <span class="operator">=</span> beginColumn; column <span class="operator"><</span><span class="operator">=</span> endColumn; <span class="operator">+</span><span class="operator">+</span>column) { <span class="type">int</span> key <span class="operator">=</span> row<span class="operator">*</span>columns <span class="operator">+</span> column; painter<span class="operator">.</span>setClipRect(column<span class="operator">*</span>squareSize<span class="operator">,</span> row<span class="operator">*</span>squareSize<span class="operator">,</span> squareSize<span class="operator">,</span> squareSize); <span class="keyword">if</span> (key <span class="operator">=</span><span class="operator">=</span> lastKey) painter<span class="operator">.</span>fillRect(column<span class="operator">*</span>squareSize <span class="operator">+</span> <span class="number">1</span><span class="operator">,</span> row<span class="operator">*</span>squareSize <span class="operator">+</span> <span class="number">1</span><span class="operator">,</span> squareSize<span class="operator">,</span> squareSize<span class="operator">,</span> <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>red)); painter<span class="operator">.</span>drawText(column<span class="operator">*</span>squareSize <span class="operator">+</span> (squareSize <span class="operator">/</span> <span class="number">2</span>) <span class="operator">-</span> fontMetrics<span class="operator">.</span>horizontalAdvance(<span class="type"><a href="../qtcore/qchar.html">QChar</a></span>(key))<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> row<span class="operator">*</span>squareSize <span class="operator">+</span> <span class="number">4</span> <span class="operator">+</span> fontMetrics<span class="operator">.</span>ascent()<span class="operator">,</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="type"><a href="../qtcore/qchar.html">QChar</a></span>(key))); } } } </pre> </div> <!-- @@@widgets/charactermap/characterwidget.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>