<?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>main.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-validators-example.html">Validators Example</a></td><td >main.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">main.cpp Example File</h1> <span class="subtitle">widgets/validators/main.cpp</span> <!-- $$$widgets/validators/main.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 <qdebug.h></span> <span class="preprocessor">#include <QApplication></span> <span class="preprocessor">#include <QLineEdit></span> <span class="preprocessor">#include <QValidator></span> <span class="preprocessor">#include "ui_validators.h"</span> <span class="keyword">class</span> ValidatorWidget : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">,</span> <span class="keyword">public</span> Ui<span class="operator">::</span>ValidatorsForm { Q_OBJECT <span class="keyword">public</span>: ValidatorWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>); <span class="keyword">private</span> <span class="keyword">slots</span>: <span class="type">void</span> updateValidator(); <span class="type">void</span> updateDoubleValidator(); <span class="type">void</span> _setLocale(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qlocale.html">QLocale</a></span> <span class="operator">&</span>l) { setLocale(l); updateValidator(); updateDoubleValidator(); } <span class="keyword">private</span>: <span class="type"><a href="../qtgui/qintvalidator.html">QIntValidator</a></span> <span class="operator">*</span>validator; <span class="type"><a href="../qtgui/qdoublevalidator.html">QDoubleValidator</a></span> <span class="operator">*</span>doubleValidator; }; ValidatorWidget<span class="operator">::</span>ValidatorWidget(<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) { setupUi(<span class="keyword">this</span>); connect(localeSelector<span class="operator">,</span> SIGNAL(localeSelected(<span class="type"><a href="../qtcore/qlocale.html">QLocale</a></span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(_setLocale(<span class="type"><a href="../qtcore/qlocale.html">QLocale</a></span>))); connect(minVal<span class="operator">,</span> SIGNAL(editingFinished())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateValidator())); connect(maxVal<span class="operator">,</span> SIGNAL(editingFinished())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateValidator())); connect(editor<span class="operator">,</span> SIGNAL(editingFinished())<span class="operator">,</span> ledWidget<span class="operator">,</span> SLOT(flash())); connect(doubleMaxVal<span class="operator">,</span> SIGNAL(editingFinished())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateDoubleValidator())); connect(doubleMinVal<span class="operator">,</span> SIGNAL(editingFinished())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateDoubleValidator())); connect(doubleDecimals<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateDoubleValidator())); connect(doubleFormat<span class="operator">,</span> SIGNAL(activated(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateDoubleValidator())); connect(doubleEditor<span class="operator">,</span> SIGNAL(editingFinished())<span class="operator">,</span> doubleLedWidget<span class="operator">,</span> SLOT(flash())); validator <span class="operator">=</span> <span class="number">0</span>; doubleValidator <span class="operator">=</span> <span class="number">0</span>; updateValidator(); updateDoubleValidator(); }; <span class="type">void</span> ValidatorWidget<span class="operator">::</span>updateValidator() { <span class="type"><a href="../qtgui/qintvalidator.html">QIntValidator</a></span> <span class="operator">*</span>v <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtgui/qintvalidator.html">QIntValidator</a></span>(minVal<span class="operator">-</span><span class="operator">></span>value()<span class="operator">,</span> maxVal<span class="operator">-</span><span class="operator">></span>value()<span class="operator">,</span> <span class="keyword">this</span>); v<span class="operator">-</span><span class="operator">></span>setLocale(locale()); editor<span class="operator">-</span><span class="operator">></span>setValidator(v); <span class="keyword">delete</span> validator; validator <span class="operator">=</span> v; <span class="type"><a href="../qtcore/qstring.html">QString</a></span> s <span class="operator">=</span> editor<span class="operator">-</span><span class="operator">></span>text(); <span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">if</span> (validator<span class="operator">-</span><span class="operator">></span>validate(s<span class="operator">,</span> i) <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtgui/qvalidator.html">QValidator</a></span><span class="operator">::</span>Invalid) { editor<span class="operator">-</span><span class="operator">></span>clear(); } <span class="keyword">else</span> { editor<span class="operator">-</span><span class="operator">></span>setText(s); } } <span class="type">void</span> ValidatorWidget<span class="operator">::</span>updateDoubleValidator() { <span class="type"><a href="../qtgui/qdoublevalidator.html">QDoubleValidator</a></span> <span class="operator">*</span>v <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtgui/qdoublevalidator.html">QDoubleValidator</a></span>(doubleMinVal<span class="operator">-</span><span class="operator">></span>value()<span class="operator">,</span> doubleMaxVal<span class="operator">-</span><span class="operator">></span>value()<span class="operator">,</span> doubleDecimals<span class="operator">-</span><span class="operator">></span>value()<span class="operator">,</span> <span class="keyword">this</span>); v<span class="operator">-</span><span class="operator">></span>setNotation(<span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="../qtgui/qdoublevalidator.html">QDoubleValidator</a></span><span class="operator">::</span>Notation<span class="operator">></span>(doubleFormat<span class="operator">-</span><span class="operator">></span>currentIndex())); v<span class="operator">-</span><span class="operator">></span>setLocale(locale()); doubleEditor<span class="operator">-</span><span class="operator">></span>setValidator(v); <span class="keyword">delete</span> doubleValidator; doubleValidator <span class="operator">=</span> v; <span class="type"><a href="../qtcore/qstring.html">QString</a></span> s <span class="operator">=</span> doubleEditor<span class="operator">-</span><span class="operator">></span>text(); <span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">if</span> (doubleValidator<span class="operator">-</span><span class="operator">></span>validate(s<span class="operator">,</span> i) <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtgui/qvalidator.html">QValidator</a></span><span class="operator">::</span>Invalid) { doubleEditor<span class="operator">-</span><span class="operator">></span>clear(); } <span class="keyword">else</span> { doubleEditor<span class="operator">-</span><span class="operator">></span>setText(s); } } <span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span><span class="operator">*</span>argv) { Q_INIT_RESOURCE(validators); <span class="type"><a href="qapplication.html">QApplication</a></span> app(argc<span class="operator">,</span> argv); ValidatorWidget w; w<span class="operator">.</span>show(); <span class="keyword">return</span> app<span class="operator">.</span>exec(); } <span class="preprocessor">#include "main.moc"</span> </pre> </div> <!-- @@@widgets/validators/main.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>