<?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>textedit.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-tools-customcompleter-example.html">Custom Completer Example</a></td><td >textedit.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">textedit.cpp Example File</h1> <span class="subtitle">tools/customcompleter/textedit.cpp</span> <!-- $$$tools/customcompleter/textedit.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 "textedit.h"</span> <span class="preprocessor">#include <QCompleter></span> <span class="preprocessor">#include <QKeyEvent></span> <span class="preprocessor">#include <QAbstractItemView></span> <span class="preprocessor">#include <QtDebug></span> <span class="preprocessor">#include <QApplication></span> <span class="preprocessor">#include <QModelIndex></span> <span class="preprocessor">#include <QAbstractItemModel></span> <span class="preprocessor">#include <QScrollBar></span> TextEdit<span class="operator">::</span>TextEdit(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="qtextedit.html">QTextEdit</a></span>(parent)<span class="operator">,</span> c(<span class="number">0</span>) { setPlainText(tr(<span class="string">"This TextEdit provides autocompletions for words that have more than"</span> <span class="string">" 3 characters. You can trigger autocompletion using "</span>) <span class="operator">+</span> <span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span>(<span class="string">"Ctrl+E"</span>)<span class="operator">.</span>toString(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>NativeText)); } TextEdit<span class="operator">::</span><span class="operator">~</span>TextEdit() { } <span class="type">void</span> TextEdit<span class="operator">::</span>setCompleter(<span class="type"><a href="qcompleter.html">QCompleter</a></span> <span class="operator">*</span>completer) { <span class="keyword">if</span> (c) <span class="type"><a href="../qtcore/qobject.html">QObject</a></span><span class="operator">::</span>disconnect(c<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="number">0</span>); c <span class="operator">=</span> completer; <span class="keyword">if</span> (<span class="operator">!</span>c) <span class="keyword">return</span>; c<span class="operator">-</span><span class="operator">></span>setWidget(<span class="keyword">this</span>); c<span class="operator">-</span><span class="operator">></span>setCompletionMode(<span class="type"><a href="qcompleter.html">QCompleter</a></span><span class="operator">::</span>PopupCompletion); c<span class="operator">-</span><span class="operator">></span>setCaseSensitivity(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>CaseInsensitive); <span class="type"><a href="../qtcore/qobject.html">QObject</a></span><span class="operator">::</span>connect(c<span class="operator">,</span> SIGNAL(activated(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(insertCompletion(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>))); } <span class="type"><a href="qcompleter.html">QCompleter</a></span> <span class="operator">*</span>TextEdit<span class="operator">::</span>completer() <span class="keyword">const</span> { <span class="keyword">return</span> c; } <span class="type">void</span> TextEdit<span class="operator">::</span>insertCompletion(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">&</span> completion) { <span class="keyword">if</span> (c<span class="operator">-</span><span class="operator">></span>widget() <span class="operator">!</span><span class="operator">=</span> <span class="keyword">this</span>) <span class="keyword">return</span>; <span class="type"><a href="../qtgui/qtextcursor.html">QTextCursor</a></span> tc <span class="operator">=</span> textCursor(); <span class="type">int</span> extra <span class="operator">=</span> completion<span class="operator">.</span>length() <span class="operator">-</span> c<span class="operator">-</span><span class="operator">></span>completionPrefix()<span class="operator">.</span>length(); tc<span class="operator">.</span>movePosition(<span class="type"><a href="../qtgui/qtextcursor.html">QTextCursor</a></span><span class="operator">::</span>Left); tc<span class="operator">.</span>movePosition(<span class="type"><a href="../qtgui/qtextcursor.html">QTextCursor</a></span><span class="operator">::</span>EndOfWord); tc<span class="operator">.</span>insertText(completion<span class="operator">.</span>right(extra)); setTextCursor(tc); } <span class="type"><a href="../qtcore/qstring.html">QString</a></span> TextEdit<span class="operator">::</span>textUnderCursor() <span class="keyword">const</span> { <span class="type"><a href="../qtgui/qtextcursor.html">QTextCursor</a></span> tc <span class="operator">=</span> textCursor(); tc<span class="operator">.</span>select(<span class="type"><a href="../qtgui/qtextcursor.html">QTextCursor</a></span><span class="operator">::</span>WordUnderCursor); <span class="keyword">return</span> tc<span class="operator">.</span>selectedText(); } <span class="type">void</span> TextEdit<span class="operator">::</span>focusInEvent(<span class="type"><a href="../qtgui/qfocusevent.html">QFocusEvent</a></span> <span class="operator">*</span>e) { <span class="keyword">if</span> (c) c<span class="operator">-</span><span class="operator">></span>setWidget(<span class="keyword">this</span>); <span class="type"><a href="qtextedit.html">QTextEdit</a></span><span class="operator">::</span>focusInEvent(e); } <span class="type">void</span> TextEdit<span class="operator">::</span>keyPressEvent(<span class="type"><a href="../qtgui/qkeyevent.html">QKeyEvent</a></span> <span class="operator">*</span>e) { <span class="keyword">if</span> (c <span class="operator">&</span><span class="operator">&</span> c<span class="operator">-</span><span class="operator">></span>popup()<span class="operator">-</span><span class="operator">></span>isVisible()) { <span class="comment">// The following keys are forwarded by the completer to the widget</span> <span class="keyword">switch</span> (e<span class="operator">-</span><span class="operator">></span>key()) { <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Enter: <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Return: <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Escape: <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Tab: <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Backtab: e<span class="operator">-</span><span class="operator">></span>ignore(); <span class="keyword">return</span>; <span class="comment">// let the completer do default behavior</span> <span class="keyword">default</span>: <span class="keyword">break</span>; } } bool isShortcut <span class="operator">=</span> ((e<span class="operator">-</span><span class="operator">></span>modifiers() <span class="operator">&</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ControlModifier) <span class="operator">&</span><span class="operator">&</span> e<span class="operator">-</span><span class="operator">></span>key() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_E); <span class="comment">// CTRL+E</span> <span class="keyword">if</span> (<span class="operator">!</span>c <span class="operator">|</span><span class="operator">|</span> <span class="operator">!</span>isShortcut) <span class="comment">// do not process the shortcut when we have a completer</span> <span class="type"><a href="qtextedit.html">QTextEdit</a></span><span class="operator">::</span>keyPressEvent(e); <span class="keyword">const</span> bool ctrlOrShift <span class="operator">=</span> e<span class="operator">-</span><span class="operator">></span>modifiers() <span class="operator">&</span> (<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ControlModifier <span class="operator">|</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ShiftModifier); <span class="keyword">if</span> (<span class="operator">!</span>c <span class="operator">|</span><span class="operator">|</span> (ctrlOrShift <span class="operator">&</span><span class="operator">&</span> e<span class="operator">-</span><span class="operator">></span>text()<span class="operator">.</span>isEmpty())) <span class="keyword">return</span>; <span class="keyword">static</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> eow(<span class="string">"~!@#$%^&*()_+{}|:\"<>?,./;'[]\\-="</span>); <span class="comment">// end of word</span> bool hasModifier <span class="operator">=</span> (e<span class="operator">-</span><span class="operator">></span>modifiers() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoModifier) <span class="operator">&</span><span class="operator">&</span> <span class="operator">!</span>ctrlOrShift; <span class="type"><a href="../qtcore/qstring.html">QString</a></span> completionPrefix <span class="operator">=</span> textUnderCursor(); <span class="keyword">if</span> (<span class="operator">!</span>isShortcut <span class="operator">&</span><span class="operator">&</span> (hasModifier <span class="operator">|</span><span class="operator">|</span> e<span class="operator">-</span><span class="operator">></span>text()<span class="operator">.</span>isEmpty()<span class="operator">|</span><span class="operator">|</span> completionPrefix<span class="operator">.</span>length() <span class="operator"><</span> <span class="number">3</span> <span class="operator">|</span><span class="operator">|</span> eow<span class="operator">.</span>contains(e<span class="operator">-</span><span class="operator">></span>text()<span class="operator">.</span>right(<span class="number">1</span>)))) { c<span class="operator">-</span><span class="operator">></span>popup()<span class="operator">-</span><span class="operator">></span>hide(); <span class="keyword">return</span>; } <span class="keyword">if</span> (completionPrefix <span class="operator">!</span><span class="operator">=</span> c<span class="operator">-</span><span class="operator">></span>completionPrefix()) { c<span class="operator">-</span><span class="operator">></span>setCompletionPrefix(completionPrefix); c<span class="operator">-</span><span class="operator">></span>popup()<span class="operator">-</span><span class="operator">></span>setCurrentIndex(c<span class="operator">-</span><span class="operator">></span>completionModel()<span class="operator">-</span><span class="operator">></span>index(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)); } <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> cr <span class="operator">=</span> cursorRect(); cr<span class="operator">.</span>setWidth(c<span class="operator">-</span><span class="operator">></span>popup()<span class="operator">-</span><span class="operator">></span>sizeHintForColumn(<span class="number">0</span>) <span class="operator">+</span> c<span class="operator">-</span><span class="operator">></span>popup()<span class="operator">-</span><span class="operator">></span>verticalScrollBar()<span class="operator">-</span><span class="operator">></span>sizeHint()<span class="operator">.</span>width()); c<span class="operator">-</span><span class="operator">></span>complete(cr); <span class="comment">// popup it up!</span> } </pre> </div> <!-- @@@tools/customcompleter/textedit.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>