<?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>droparea.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-draganddrop-dropsite-example.html">Drop Site Example</a></td><td >droparea.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">droparea.cpp Example File</h1> <span class="subtitle">draganddrop/dropsite/droparea.cpp</span> <!-- $$$draganddrop/dropsite/droparea.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 "droparea.h"</span> <span class="preprocessor">#include <QDragEnterEvent></span> <span class="preprocessor">#include <QMimeData></span> DropArea<span class="operator">::</span>DropArea(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="qlabel.html">QLabel</a></span>(parent) { setMinimumSize(<span class="number">200</span><span class="operator">,</span> <span class="number">200</span>); setFrameStyle(<span class="type"><a href="qframe.html">QFrame</a></span><span class="operator">::</span>Sunken <span class="operator">|</span> <span class="type"><a href="qframe.html">QFrame</a></span><span class="operator">::</span>StyledPanel); setAlignment(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AlignCenter); setAcceptDrops(<span class="keyword">true</span>); setAutoFillBackground(<span class="keyword">true</span>); clear(); } <span class="type">void</span> DropArea<span class="operator">::</span>dragEnterEvent(<span class="type"><a href="../qtgui/qdragenterevent.html">QDragEnterEvent</a></span> <span class="operator">*</span>event) { setText(tr(<span class="string">"<drop content>"</span>)); setBackgroundRole(<span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>Highlight); event<span class="operator">-</span><span class="operator">></span>acceptProposedAction(); <span class="keyword">emit</span> changed(event<span class="operator">-</span><span class="operator">></span>mimeData()); } <span class="type">void</span> DropArea<span class="operator">::</span>dragMoveEvent(<span class="type"><a href="../qtgui/qdragmoveevent.html">QDragMoveEvent</a></span> <span class="operator">*</span>event) { event<span class="operator">-</span><span class="operator">></span>acceptProposedAction(); } <span class="type">void</span> DropArea<span class="operator">::</span>dropEvent(<span class="type"><a href="../qtgui/qdropevent.html">QDropEvent</a></span> <span class="operator">*</span>event) { <span class="keyword">const</span> <span class="type"><a href="../qtcore/qmimedata.html">QMimeData</a></span> <span class="operator">*</span>mimeData <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>mimeData(); <span class="keyword">if</span> (mimeData<span class="operator">-</span><span class="operator">></span>hasImage()) { setPixmap(qvariant_cast<span class="operator"><</span><span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span><span class="operator">></span>(mimeData<span class="operator">-</span><span class="operator">></span>imageData())); } <span class="keyword">else</span> <span class="keyword">if</span> (mimeData<span class="operator">-</span><span class="operator">></span>hasHtml()) { setText(mimeData<span class="operator">-</span><span class="operator">></span>html()); setTextFormat(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>RichText); } <span class="keyword">else</span> <span class="keyword">if</span> (mimeData<span class="operator">-</span><span class="operator">></span>hasText()) { setText(mimeData<span class="operator">-</span><span class="operator">></span>text()); setTextFormat(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>PlainText); } <span class="keyword">else</span> <span class="keyword">if</span> (mimeData<span class="operator">-</span><span class="operator">></span>hasUrls()) { <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qurl.html">QUrl</a></span><span class="operator">></span> urlList <span class="operator">=</span> mimeData<span class="operator">-</span><span class="operator">></span>urls(); <span class="type"><a href="../qtcore/qstring.html">QString</a></span> text; <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> urlList<span class="operator">.</span>size() <span class="operator">&</span><span class="operator">&</span> i <span class="operator"><</span> <span class="number">32</span>; <span class="operator">+</span><span class="operator">+</span>i) text <span class="operator">+</span><span class="operator">=</span> urlList<span class="operator">.</span>at(i)<span class="operator">.</span>path() <span class="operator">+</span> QLatin1Char(<span class="char">'\n'</span>); setText(text); } <span class="keyword">else</span> { setText(tr(<span class="string">"Cannot display data"</span>)); } setBackgroundRole(<span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>Dark); event<span class="operator">-</span><span class="operator">></span>acceptProposedAction(); } <span class="type">void</span> DropArea<span class="operator">::</span>dragLeaveEvent(<span class="type"><a href="../qtgui/qdragleaveevent.html">QDragLeaveEvent</a></span> <span class="operator">*</span>event) { clear(); event<span class="operator">-</span><span class="operator">></span>accept(); } <span class="type">void</span> DropArea<span class="operator">::</span>clear() { setText(tr(<span class="string">"<drop content>"</span>)); setBackgroundRole(<span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>Dark); <span class="keyword">emit</span> changed(); } </pre> </div> <!-- @@@draganddrop/dropsite/droparea.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>