<?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>piecesmodel.cpp Example File | Qt Widgets 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="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-itemviews-puzzle-example.html">Item Views Puzzle Example</a></td><td >piecesmodel.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtwidgets-index.html">Qt 5.12.2 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">piecesmodel.cpp Example File</h1> <span class="subtitle">itemviews/puzzle/piecesmodel.cpp</span> <!-- $$$itemviews/puzzle/piecesmodel.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 "piecesmodel.h"</span> <span class="preprocessor">#include <QIcon></span> <span class="preprocessor">#include <QMimeData></span> <span class="preprocessor">#include <QRandomGenerator></span> PiecesModel<span class="operator">::</span>PiecesModel(<span class="type">int</span> pieceSize<span class="operator">,</span> <span class="type"><a href="../qtcore/qobject.html">QObject</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="../qtcore/qabstractlistmodel.html">QAbstractListModel</a></span>(parent)<span class="operator">,</span> m_PieceSize(pieceSize) { } <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> PiecesModel<span class="operator">::</span>data(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></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> (<span class="operator">!</span>index<span class="operator">.</span>isValid()) <span class="keyword">return</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(); <span class="keyword">if</span> (role <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DecorationRole) <span class="keyword">return</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span>(pixmaps<span class="operator">.</span>value(index<span class="operator">.</span>row())<span class="operator">.</span>scaled(m_PieceSize<span class="operator">,</span> m_PieceSize<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>KeepAspectRatio<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>SmoothTransformation)); <span class="keyword">else</span> <span class="keyword">if</span> (role <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole) <span class="keyword">return</span> pixmaps<span class="operator">.</span>value(index<span class="operator">.</span>row()); <span class="keyword">else</span> <span class="keyword">if</span> (role <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole <span class="operator">+</span> <span class="number">1</span>) <span class="keyword">return</span> locations<span class="operator">.</span>value(index<span class="operator">.</span>row()); <span class="keyword">return</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(); } <span class="type">void</span> PiecesModel<span class="operator">::</span>addPiece(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> <span class="operator">&</span>pixmap<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> <span class="operator">&</span>location) { <span class="type">int</span> row; <span class="keyword">if</span> (<span class="type"><a href="../qtcore/qrandomgenerator.html">QRandomGenerator</a></span><span class="operator">::</span>global()<span class="operator">-</span><span class="operator">></span>bounded(<span class="number">2</span>) <span class="operator">=</span><span class="operator">=</span> <span class="number">1</span>) row <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">else</span> row <span class="operator">=</span> pixmaps<span class="operator">.</span>size(); beginInsertRows(<span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>()<span class="operator">,</span> row<span class="operator">,</span> row); pixmaps<span class="operator">.</span>insert(row<span class="operator">,</span> pixmap); locations<span class="operator">.</span>insert(row<span class="operator">,</span> location); endInsertRows(); } <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ItemFlags PiecesModel<span class="operator">::</span>flags(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>index) <span class="keyword">const</span> { <span class="keyword">if</span> (index<span class="operator">.</span>isValid()) <span class="keyword">return</span> (<span class="type"><a href="../qtcore/qabstractlistmodel.html">QAbstractListModel</a></span><span class="operator">::</span>flags(index)<span class="operator">|</span><span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ItemIsDragEnabled); <span class="keyword">return</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ItemIsDropEnabled; } bool PiecesModel<span class="operator">::</span>removeRows(<span class="type">int</span> row<span class="operator">,</span> <span class="type">int</span> count<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>parent) { <span class="keyword">if</span> (parent<span class="operator">.</span>isValid()) <span class="keyword">return</span> <span class="keyword">false</span>; <span class="keyword">if</span> (row <span class="operator">></span><span class="operator">=</span> pixmaps<span class="operator">.</span>size() <span class="operator">|</span><span class="operator">|</span> row <span class="operator">+</span> count <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span>) <span class="keyword">return</span> <span class="keyword">false</span>; <span class="type">int</span> beginRow <span class="operator">=</span> <a href="../qtcore/qtglobal.html#qMax">qMax</a>(<span class="number">0</span><span class="operator">,</span> row); <span class="type">int</span> endRow <span class="operator">=</span> <a href="../qtcore/qtglobal.html#qMin">qMin</a>(row <span class="operator">+</span> count <span class="operator">-</span> <span class="number">1</span><span class="operator">,</span> pixmaps<span class="operator">.</span>size() <span class="operator">-</span> <span class="number">1</span>); beginRemoveRows(parent<span class="operator">,</span> beginRow<span class="operator">,</span> endRow); <span class="keyword">while</span> (beginRow <span class="operator"><</span><span class="operator">=</span> endRow) { pixmaps<span class="operator">.</span>removeAt(beginRow); locations<span class="operator">.</span>removeAt(beginRow); <span class="operator">+</span><span class="operator">+</span>beginRow; } endRemoveRows(); <span class="keyword">return</span> <span class="keyword">true</span>; } <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> PiecesModel<span class="operator">::</span>mimeTypes() <span class="keyword">const</span> { <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> types; types <span class="operator"><</span><span class="operator"><</span> <span class="string">"image/x-puzzle-piece"</span>; <span class="keyword">return</span> types; } <span class="type"><a href="../qtcore/qmimedata.html">QMimeData</a></span> <span class="operator">*</span>PiecesModel<span class="operator">::</span>mimeData(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html#QModelIndexList-typedef">QModelIndexList</a></span> <span class="operator">&</span>indexes) <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> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qmimedata.html">QMimeData</a></span>(); <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> encodedData; <span class="type"><a href="../qtcore/qdatastream.html">QDataStream</a></span> stream(<span class="operator">&</span>encodedData<span class="operator">,</span> <span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>WriteOnly); foreach (<span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> index<span class="operator">,</span> indexes) { <span class="keyword">if</span> (index<span class="operator">.</span>isValid()) { <span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> pixmap <span class="operator">=</span> qvariant_cast<span class="operator"><</span><span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span><span class="operator">></span>(data(index<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole)); <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> location <span class="operator">=</span> data(index<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole<span class="operator">+</span><span class="number">1</span>)<span class="operator">.</span>toPoint(); stream <span class="operator"><</span><span class="operator"><</span> pixmap <span class="operator"><</span><span class="operator"><</span> location; } } mimeData<span class="operator">-</span><span class="operator">></span>setData(<span class="string">"image/x-puzzle-piece"</span><span class="operator">,</span> encodedData); <span class="keyword">return</span> mimeData; } bool PiecesModel<span class="operator">::</span>dropMimeData(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmimedata.html">QMimeData</a></span> <span class="operator">*</span>data<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DropAction action<span class="operator">,</span> <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"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>parent) { <span class="keyword">if</span> (<span class="operator">!</span>data<span class="operator">-</span><span class="operator">></span>hasFormat(<span class="string">"image/x-puzzle-piece"</span>)) <span class="keyword">return</span> <span class="keyword">false</span>; <span class="keyword">if</span> (action <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>IgnoreAction) <span class="keyword">return</span> <span class="keyword">true</span>; <span class="keyword">if</span> (column <span class="operator">></span> <span class="number">0</span>) <span class="keyword">return</span> <span class="keyword">false</span>; <span class="type">int</span> endRow; <span class="keyword">if</span> (<span class="operator">!</span>parent<span class="operator">.</span>isValid()) { <span class="keyword">if</span> (row <span class="operator"><</span> <span class="number">0</span>) endRow <span class="operator">=</span> pixmaps<span class="operator">.</span>size(); <span class="keyword">else</span> endRow <span class="operator">=</span> <a href="../qtcore/qtglobal.html#qMin">qMin</a>(row<span class="operator">,</span> pixmaps<span class="operator">.</span>size()); } <span class="keyword">else</span> { endRow <span class="operator">=</span> parent<span class="operator">.</span>row(); } <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> encodedData <span class="operator">=</span> data<span class="operator">-</span><span class="operator">></span>data(<span class="string">"image/x-puzzle-piece"</span>); <span class="type"><a href="../qtcore/qdatastream.html">QDataStream</a></span> stream(<span class="operator">&</span>encodedData<span class="operator">,</span> <span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly); <span class="keyword">while</span> (<span class="operator">!</span>stream<span class="operator">.</span>atEnd()) { <span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> pixmap; <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> location; stream <span class="operator">></span><span class="operator">></span> pixmap <span class="operator">></span><span class="operator">></span> location; beginInsertRows(<span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>()<span class="operator">,</span> endRow<span class="operator">,</span> endRow); pixmaps<span class="operator">.</span>insert(endRow<span class="operator">,</span> pixmap); locations<span class="operator">.</span>insert(endRow<span class="operator">,</span> location); endInsertRows(); <span class="operator">+</span><span class="operator">+</span>endRow; } <span class="keyword">return</span> <span class="keyword">true</span>; } <span class="type">int</span> PiecesModel<span class="operator">::</span>rowCount(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>parent) <span class="keyword">const</span> { <span class="keyword">if</span> (parent<span class="operator">.</span>isValid()) <span class="keyword">return</span> <span class="number">0</span>; <span class="keyword">else</span> <span class="keyword">return</span> pixmaps<span class="operator">.</span>size(); } <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DropActions PiecesModel<span class="operator">::</span>supportedDropActions() <span class="keyword">const</span> { <span class="keyword">return</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>CopyAction <span class="operator">|</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>MoveAction; } <span class="type">void</span> PiecesModel<span class="operator">::</span>addPieces(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span><span class="operator">&</span> pixmap) { <span class="keyword">if</span> (<span class="operator">!</span>pixmaps<span class="operator">.</span>isEmpty()) { beginRemoveRows(<span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>()<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> pixmaps<span class="operator">.</span>size() <span class="operator">-</span> <span class="number">1</span>); pixmaps<span class="operator">.</span>clear(); locations<span class="operator">.</span>clear(); endRemoveRows(); } <span class="keyword">for</span> (<span class="type">int</span> y <span class="operator">=</span> <span class="number">0</span>; y <span class="operator"><</span> <span class="number">5</span>; <span class="operator">+</span><span class="operator">+</span>y) { <span class="keyword">for</span> (<span class="type">int</span> x <span class="operator">=</span> <span class="number">0</span>; x <span class="operator"><</span> <span class="number">5</span>; <span class="operator">+</span><span class="operator">+</span>x) { <span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> pieceImage <span class="operator">=</span> pixmap<span class="operator">.</span>copy(x<span class="operator">*</span>m_PieceSize<span class="operator">,</span> y<span class="operator">*</span>m_PieceSize<span class="operator">,</span> m_PieceSize<span class="operator">,</span> m_PieceSize); addPiece(pieceImage<span class="operator">,</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span>(x<span class="operator">,</span> y)); } } } </pre> </div> <!-- @@@itemviews/puzzle/piecesmodel.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>