<?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>codeeditor.cpp Example File | Qt Widgets 5.9</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.9</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-widgets-codeeditor-example.html">Code Editor Example</a></td><td >codeeditor.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">codeeditor.cpp Example File</h1> <span class="subtitle">widgets/codeeditor/codeeditor.cpp</span> <!-- $$$widgets/codeeditor/codeeditor.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 "codeeditor.h"</span> CodeEditor<span class="operator">::</span>CodeEditor(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="qplaintextedit.html">QPlainTextEdit</a></span>(parent) { lineNumberArea <span class="operator">=</span> <span class="keyword">new</span> LineNumberArea(<span class="keyword">this</span>); connect(<span class="keyword">this</span><span class="operator">,</span> SIGNAL(blockCountChanged(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateLineNumberAreaWidth(<span class="type">int</span>))); connect(<span class="keyword">this</span><span class="operator">,</span> SIGNAL(updateRequest(<span class="type"><a href="../qtcore/qrect.html">QRect</a></span><span class="operator">,</span><span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateLineNumberArea(<span class="type"><a href="../qtcore/qrect.html">QRect</a></span><span class="operator">,</span><span class="type">int</span>))); connect(<span class="keyword">this</span><span class="operator">,</span> SIGNAL(cursorPositionChanged())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(highlightCurrentLine())); updateLineNumberAreaWidth(<span class="number">0</span>); highlightCurrentLine(); } <span class="type">int</span> CodeEditor<span class="operator">::</span>lineNumberAreaWidth() { <span class="type">int</span> digits <span class="operator">=</span> <span class="number">1</span>; <span class="type">int</span> max <span class="operator">=</span> <a href="../qtcore/qtglobal.html#qMax">qMax</a>(<span class="number">1</span><span class="operator">,</span> blockCount()); <span class="keyword">while</span> (max <span class="operator">></span><span class="operator">=</span> <span class="number">10</span>) { max <span class="operator">/</span><span class="operator">=</span> <span class="number">10</span>; <span class="operator">+</span><span class="operator">+</span>digits; } <span class="type">int</span> space <span class="operator">=</span> <span class="number">3</span> <span class="operator">+</span> fontMetrics()<span class="operator">.</span>width(QLatin1Char(<span class="char">'9'</span>)) <span class="operator">*</span> digits; <span class="keyword">return</span> space; } <span class="type">void</span> CodeEditor<span class="operator">::</span>updateLineNumberAreaWidth(<span class="type">int</span> <span class="comment">/* newBlockCount */</span>) { setViewportMargins(lineNumberAreaWidth()<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>); } <span class="type">void</span> CodeEditor<span class="operator">::</span>updateLineNumberArea(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> <span class="operator">&</span>rect<span class="operator">,</span> <span class="type">int</span> dy) { <span class="keyword">if</span> (dy) lineNumberArea<span class="operator">-</span><span class="operator">></span>scroll(<span class="number">0</span><span class="operator">,</span> dy); <span class="keyword">else</span> lineNumberArea<span class="operator">-</span><span class="operator">></span>update(<span class="number">0</span><span class="operator">,</span> rect<span class="operator">.</span>y()<span class="operator">,</span> lineNumberArea<span class="operator">-</span><span class="operator">></span>width()<span class="operator">,</span> rect<span class="operator">.</span>height()); <span class="keyword">if</span> (rect<span class="operator">.</span>contains(viewport()<span class="operator">-</span><span class="operator">></span>rect())) updateLineNumberAreaWidth(<span class="number">0</span>); } <span class="type">void</span> CodeEditor<span class="operator">::</span>resizeEvent(<span class="type"><a href="../qtgui/qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span>e) { <span class="type"><a href="qplaintextedit.html">QPlainTextEdit</a></span><span class="operator">::</span>resizeEvent(e); <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> cr <span class="operator">=</span> contentsRect(); lineNumberArea<span class="operator">-</span><span class="operator">></span>setGeometry(<span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(cr<span class="operator">.</span>left()<span class="operator">,</span> cr<span class="operator">.</span>top()<span class="operator">,</span> lineNumberAreaWidth()<span class="operator">,</span> cr<span class="operator">.</span>height())); } <span class="type">void</span> CodeEditor<span class="operator">::</span>highlightCurrentLine() { <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qtextedit.html">QTextEdit</a></span><span class="operator">::</span>ExtraSelection<span class="operator">></span> extraSelections; <span class="keyword">if</span> (<span class="operator">!</span>isReadOnly()) { <span class="type"><a href="qtextedit.html">QTextEdit</a></span><span class="operator">::</span>ExtraSelection selection; <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> lineColor <span class="operator">=</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>yellow)<span class="operator">.</span>lighter(<span class="number">160</span>); selection<span class="operator">.</span>format<span class="operator">.</span>setBackground(lineColor); selection<span class="operator">.</span>format<span class="operator">.</span>setProperty(<span class="type"><a href="../qtgui/qtextformat.html">QTextFormat</a></span><span class="operator">::</span>FullWidthSelection<span class="operator">,</span> <span class="keyword">true</span>); selection<span class="operator">.</span>cursor <span class="operator">=</span> textCursor(); selection<span class="operator">.</span>cursor<span class="operator">.</span>clearSelection(); extraSelections<span class="operator">.</span>append(selection); } setExtraSelections(extraSelections); } <span class="type">void</span> CodeEditor<span class="operator">::</span>lineNumberAreaPaintEvent(<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(lineNumberArea); 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="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>lightGray); <span class="type"><a href="../qtgui/qtextblock.html">QTextBlock</a></span> block <span class="operator">=</span> firstVisibleBlock(); <span class="type">int</span> blockNumber <span class="operator">=</span> block<span class="operator">.</span>blockNumber(); <span class="type">int</span> top <span class="operator">=</span> (<span class="type">int</span>) blockBoundingGeometry(block)<span class="operator">.</span>translated(contentOffset())<span class="operator">.</span>top(); <span class="type">int</span> bottom <span class="operator">=</span> top <span class="operator">+</span> (<span class="type">int</span>) blockBoundingRect(block)<span class="operator">.</span>height(); <span class="keyword">while</span> (block<span class="operator">.</span>isValid() <span class="operator">&</span><span class="operator">&</span> top <span class="operator"><</span><span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">.</span>bottom()) { <span class="keyword">if</span> (block<span class="operator">.</span>isVisible() <span class="operator">&</span><span class="operator">&</span> bottom <span class="operator">></span><span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">.</span>top()) { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> number <span class="operator">=</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>number(blockNumber <span class="operator">+</span> <span class="number">1</span>); painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black); painter<span class="operator">.</span>drawText(<span class="number">0</span><span class="operator">,</span> top<span class="operator">,</span> lineNumberArea<span class="operator">-</span><span class="operator">></span>width()<span class="operator">,</span> fontMetrics()<span class="operator">.</span>height()<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AlignRight<span class="operator">,</span> number); } block <span class="operator">=</span> block<span class="operator">.</span>next(); top <span class="operator">=</span> bottom; bottom <span class="operator">=</span> top <span class="operator">+</span> (<span class="type">int</span>) blockBoundingRect(block)<span class="operator">.</span>height(); <span class="operator">+</span><span class="operator">+</span>blockNumber; } } </pre> </div> <!-- @@@widgets/codeeditor/codeeditor.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>