<?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>playlistmodel.cpp Example File | Qt Multimedia 5.12.2</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="qtmultimedia-index.html">Qt Multimedia</a></td><td ><a href="qtmultimedia-multimediawidgets-player-example.html">Media Player Example</a></td><td >playlistmodel.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtmultimedia-index.html">Qt 5.12.2 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">playlistmodel.cpp Example File</h1> <span class="subtitle">multimediawidgets/player/playlistmodel.cpp</span> <!-- $$$multimediawidgets/player/playlistmodel.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2017 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 "playlistmodel.h"</span> <span class="preprocessor">#include <QFileInfo></span> <span class="preprocessor">#include <QUrl></span> <span class="preprocessor">#include <QMediaPlaylist></span> PlaylistModel<span class="operator">::</span>PlaylistModel(<span class="type">QObject</span> <span class="operator">*</span>parent) : <span class="type">QAbstractItemModel</span>(parent) { } PlaylistModel<span class="operator">::</span><span class="operator">~</span>PlaylistModel() { } <span class="type">int</span> PlaylistModel<span class="operator">::</span>rowCount(<span class="keyword">const</span> <span class="type">QModelIndex</span> <span class="operator">&</span>parent) <span class="keyword">const</span> { <span class="keyword">return</span> m_playlist <span class="operator">&</span><span class="operator">&</span> <span class="operator">!</span>parent<span class="operator">.</span>isValid() <span class="operator">?</span> m_playlist<span class="operator">-</span><span class="operator">></span>mediaCount() : <span class="number">0</span>; } <span class="type">int</span> PlaylistModel<span class="operator">::</span>columnCount(<span class="keyword">const</span> <span class="type">QModelIndex</span> <span class="operator">&</span>parent) <span class="keyword">const</span> { <span class="keyword">return</span> <span class="operator">!</span>parent<span class="operator">.</span>isValid() <span class="operator">?</span> ColumnCount : <span class="number">0</span>; } <span class="type">QModelIndex</span> PlaylistModel<span class="operator">::</span>index(<span class="type">int</span> row<span class="operator">,</span> <span class="type">int</span> column<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QModelIndex</span> <span class="operator">&</span>parent) <span class="keyword">const</span> { <span class="keyword">return</span> m_playlist <span class="operator">&</span><span class="operator">&</span> <span class="operator">!</span>parent<span class="operator">.</span>isValid() <span class="operator">&</span><span class="operator">&</span> row <span class="operator">></span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> row <span class="operator"><</span> m_playlist<span class="operator">-</span><span class="operator">></span>mediaCount() <span class="operator">&</span><span class="operator">&</span> column <span class="operator">></span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> column <span class="operator"><</span> ColumnCount <span class="operator">?</span> createIndex(row<span class="operator">,</span> column) : <span class="type">QModelIndex</span>(); } <span class="type">QModelIndex</span> PlaylistModel<span class="operator">::</span>parent(<span class="keyword">const</span> <span class="type">QModelIndex</span> <span class="operator">&</span>child) <span class="keyword">const</span> { Q_UNUSED(child); <span class="keyword">return</span> <span class="type">QModelIndex</span>(); } <span class="type">QVariant</span> PlaylistModel<span class="operator">::</span>data(<span class="keyword">const</span> <span class="type">QModelIndex</span> <span class="operator">&</span>index<span class="operator">,</span> <span class="type">int</span> role) <span class="keyword">const</span> { <span class="keyword">if</span> (index<span class="operator">.</span>isValid() <span class="operator">&</span><span class="operator">&</span> role <span class="operator">=</span><span class="operator">=</span> <span class="type">Qt</span><span class="operator">::</span>DisplayRole) { <span class="type">QVariant</span> value <span class="operator">=</span> m_data<span class="operator">[</span>index<span class="operator">]</span>; <span class="keyword">if</span> (<span class="operator">!</span>value<span class="operator">.</span>isValid() <span class="operator">&</span><span class="operator">&</span> index<span class="operator">.</span>column() <span class="operator">=</span><span class="operator">=</span> Title) { <span class="type">QUrl</span> location <span class="operator">=</span> m_playlist<span class="operator">-</span><span class="operator">></span>media(index<span class="operator">.</span>row())<span class="operator">.</span>canonicalUrl(); <span class="keyword">return</span> <span class="type">QFileInfo</span>(location<span class="operator">.</span>path())<span class="operator">.</span>fileName(); } <span class="keyword">return</span> value; } <span class="keyword">return</span> <span class="type">QVariant</span>(); } <span class="type"><a href="qmediaplaylist.html">QMediaPlaylist</a></span> <span class="operator">*</span>PlaylistModel<span class="operator">::</span>playlist() <span class="keyword">const</span> { <span class="keyword">return</span> m_playlist<span class="operator">.</span>data(); } <span class="type">void</span> PlaylistModel<span class="operator">::</span>setPlaylist(<span class="type"><a href="qmediaplaylist.html">QMediaPlaylist</a></span> <span class="operator">*</span>playlist) { <span class="keyword">if</span> (m_playlist) { disconnect(m_playlist<span class="operator">.</span>data()<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qmediaplaylist.html">QMediaPlaylist</a></span><span class="operator">::</span>mediaAboutToBeInserted<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>PlaylistModel<span class="operator">::</span>beginInsertItems); disconnect(m_playlist<span class="operator">.</span>data()<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qmediaplaylist.html">QMediaPlaylist</a></span><span class="operator">::</span>mediaInserted<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>PlaylistModel<span class="operator">::</span>endInsertItems); disconnect(m_playlist<span class="operator">.</span>data()<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qmediaplaylist.html">QMediaPlaylist</a></span><span class="operator">::</span>mediaAboutToBeRemoved<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>PlaylistModel<span class="operator">::</span>beginRemoveItems); disconnect(m_playlist<span class="operator">.</span>data()<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qmediaplaylist.html">QMediaPlaylist</a></span><span class="operator">::</span>mediaRemoved<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>PlaylistModel<span class="operator">::</span>endRemoveItems); disconnect(m_playlist<span class="operator">.</span>data()<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qmediaplaylist.html">QMediaPlaylist</a></span><span class="operator">::</span>mediaChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>PlaylistModel<span class="operator">::</span>changeItems); } beginResetModel(); m_playlist<span class="operator">.</span>reset(playlist); <span class="keyword">if</span> (m_playlist) { connect(m_playlist<span class="operator">.</span>data()<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qmediaplaylist.html">QMediaPlaylist</a></span><span class="operator">::</span>mediaAboutToBeInserted<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>PlaylistModel<span class="operator">::</span>beginInsertItems); connect(m_playlist<span class="operator">.</span>data()<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qmediaplaylist.html">QMediaPlaylist</a></span><span class="operator">::</span>mediaInserted<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>PlaylistModel<span class="operator">::</span>endInsertItems); connect(m_playlist<span class="operator">.</span>data()<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qmediaplaylist.html">QMediaPlaylist</a></span><span class="operator">::</span>mediaAboutToBeRemoved<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>PlaylistModel<span class="operator">::</span>beginRemoveItems); connect(m_playlist<span class="operator">.</span>data()<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qmediaplaylist.html">QMediaPlaylist</a></span><span class="operator">::</span>mediaRemoved<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>PlaylistModel<span class="operator">::</span>endRemoveItems); connect(m_playlist<span class="operator">.</span>data()<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qmediaplaylist.html">QMediaPlaylist</a></span><span class="operator">::</span>mediaChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>PlaylistModel<span class="operator">::</span>changeItems); } endResetModel(); } bool PlaylistModel<span class="operator">::</span>setData(<span class="keyword">const</span> <span class="type">QModelIndex</span> <span class="operator">&</span>index<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QVariant</span> <span class="operator">&</span>value<span class="operator">,</span> <span class="type">int</span> role) { Q_UNUSED(role); m_data<span class="operator">[</span>index<span class="operator">]</span> <span class="operator">=</span> value; <span class="keyword">emit</span> dataChanged(index<span class="operator">,</span> index); <span class="keyword">return</span> <span class="keyword">true</span>; } <span class="type">void</span> PlaylistModel<span class="operator">::</span>beginInsertItems(<span class="type">int</span> start<span class="operator">,</span> <span class="type">int</span> end) { m_data<span class="operator">.</span>clear(); beginInsertRows(<span class="type">QModelIndex</span>()<span class="operator">,</span> start<span class="operator">,</span> end); } <span class="type">void</span> PlaylistModel<span class="operator">::</span>endInsertItems() { endInsertRows(); } <span class="type">void</span> PlaylistModel<span class="operator">::</span>beginRemoveItems(<span class="type">int</span> start<span class="operator">,</span> <span class="type">int</span> end) { m_data<span class="operator">.</span>clear(); beginRemoveRows(<span class="type">QModelIndex</span>()<span class="operator">,</span> start<span class="operator">,</span> end); } <span class="type">void</span> PlaylistModel<span class="operator">::</span>endRemoveItems() { endInsertRows(); } <span class="type">void</span> PlaylistModel<span class="operator">::</span>changeItems(<span class="type">int</span> start<span class="operator">,</span> <span class="type">int</span> end) { m_data<span class="operator">.</span>clear(); <span class="keyword">emit</span> dataChanged(index(start<span class="operator">,</span><span class="number">0</span>)<span class="operator">,</span> index(end<span class="operator">,</span>ColumnCount)); } </pre> </div> <!-- @@@multimediawidgets/player/playlistmodel.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>