<?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>puzzlewidget.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-draganddrop-puzzle-example.html">Drag and Drop Puzzle Example</a></td><td >puzzlewidget.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">puzzlewidget.cpp Example File</h1> <span class="subtitle">draganddrop/puzzle/puzzlewidget.cpp</span> <!-- $$$draganddrop/puzzle/puzzlewidget.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 "puzzlewidget.h"</span> <span class="preprocessor">#include "pieceslist.h"</span> <span class="preprocessor">#include <QDrag></span> <span class="preprocessor">#include <QDragEnterEvent></span> <span class="preprocessor">#include <QMimeData></span> <span class="preprocessor">#include <QPainter></span> PuzzleWidget<span class="operator">::</span>PuzzleWidget(<span class="type">int</span> imageSize<span class="operator">,</span> <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)<span class="operator">,</span> m_ImageSize(imageSize) { setAcceptDrops(<span class="keyword">true</span>); setMinimumSize(m_ImageSize<span class="operator">,</span> m_ImageSize); setMaximumSize(m_ImageSize<span class="operator">,</span> m_ImageSize); } <span class="type">void</span> PuzzleWidget<span class="operator">::</span>clear() { pieces<span class="operator">.</span>clear(); highlightedRect <span class="operator">=</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(); inPlace <span class="operator">=</span> <span class="number">0</span>; update(); } <span class="type">void</span> PuzzleWidget<span class="operator">::</span>dragEnterEvent(<span class="type"><a href="../qtgui/qdragenterevent.html">QDragEnterEvent</a></span> <span class="operator">*</span>event) { <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>mimeData()<span class="operator">-</span><span class="operator">></span>hasFormat(PiecesList<span class="operator">::</span>puzzleMimeType())) event<span class="operator">-</span><span class="operator">></span>accept(); <span class="keyword">else</span> event<span class="operator">-</span><span class="operator">></span>ignore(); } <span class="type">void</span> PuzzleWidget<span class="operator">::</span>dragLeaveEvent(<span class="type"><a href="../qtgui/qdragleaveevent.html">QDragLeaveEvent</a></span> <span class="operator">*</span>event) { <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> updateRect <span class="operator">=</span> highlightedRect; highlightedRect <span class="operator">=</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(); update(updateRect); event<span class="operator">-</span><span class="operator">></span>accept(); } <span class="type">void</span> PuzzleWidget<span class="operator">::</span>dragMoveEvent(<span class="type"><a href="../qtgui/qdragmoveevent.html">QDragMoveEvent</a></span> <span class="operator">*</span>event) { <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> updateRect <span class="operator">=</span> highlightedRect<span class="operator">.</span>united(targetSquare(event<span class="operator">-</span><span class="operator">></span>pos())); <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>mimeData()<span class="operator">-</span><span class="operator">></span>hasFormat(PiecesList<span class="operator">::</span>puzzleMimeType()) <span class="operator">&</span><span class="operator">&</span> findPiece(targetSquare(event<span class="operator">-</span><span class="operator">></span>pos())) <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) { highlightedRect <span class="operator">=</span> targetSquare(event<span class="operator">-</span><span class="operator">></span>pos()); event<span class="operator">-</span><span class="operator">></span>setDropAction(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>MoveAction); event<span class="operator">-</span><span class="operator">></span>accept(); } <span class="keyword">else</span> { highlightedRect <span class="operator">=</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(); event<span class="operator">-</span><span class="operator">></span>ignore(); } update(updateRect); } <span class="type">void</span> PuzzleWidget<span class="operator">::</span>dropEvent(<span class="type"><a href="../qtgui/qdropevent.html">QDropEvent</a></span> <span class="operator">*</span>event) { <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>mimeData()<span class="operator">-</span><span class="operator">></span>hasFormat(PiecesList<span class="operator">::</span>puzzleMimeType()) <span class="operator">&</span><span class="operator">&</span> findPiece(targetSquare(event<span class="operator">-</span><span class="operator">></span>pos())) <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) { <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> pieceData <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>mimeData()<span class="operator">-</span><span class="operator">></span>data(PiecesList<span class="operator">::</span>puzzleMimeType()); <span class="type"><a href="../qtcore/qdatastream.html">QDataStream</a></span> dataStream(<span class="operator">&</span>pieceData<span class="operator">,</span> <span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly); Piece piece; piece<span class="operator">.</span>rect <span class="operator">=</span> targetSquare(event<span class="operator">-</span><span class="operator">></span>pos()); dataStream <span class="operator">></span><span class="operator">></span> piece<span class="operator">.</span>pixmap <span class="operator">></span><span class="operator">></span> piece<span class="operator">.</span>location; pieces<span class="operator">.</span>append(piece); highlightedRect <span class="operator">=</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(); update(piece<span class="operator">.</span>rect); event<span class="operator">-</span><span class="operator">></span>setDropAction(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>MoveAction); event<span class="operator">-</span><span class="operator">></span>accept(); <span class="keyword">if</span> (piece<span class="operator">.</span>location <span class="operator">=</span><span class="operator">=</span> piece<span class="operator">.</span>rect<span class="operator">.</span>topLeft() <span class="operator">/</span> pieceSize()) { inPlace<span class="operator">+</span><span class="operator">+</span>; <span class="keyword">if</span> (inPlace <span class="operator">=</span><span class="operator">=</span> <span class="number">25</span>) <span class="keyword">emit</span> puzzleCompleted(); } } <span class="keyword">else</span> { highlightedRect <span class="operator">=</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(); event<span class="operator">-</span><span class="operator">></span>ignore(); } } <span class="type">int</span> PuzzleWidget<span class="operator">::</span>findPiece(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> <span class="operator">&</span>pieceRect) <span class="keyword">const</span> { <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span><span class="operator">,</span> size <span class="operator">=</span> pieces<span class="operator">.</span>size(); i <span class="operator"><</span> size; <span class="operator">+</span><span class="operator">+</span>i) { <span class="keyword">if</span> (pieces<span class="operator">.</span>at(i)<span class="operator">.</span>rect <span class="operator">=</span><span class="operator">=</span> pieceRect) <span class="keyword">return</span> i; } <span class="keyword">return</span> <span class="operator">-</span><span class="number">1</span>; } <span class="type">void</span> PuzzleWidget<span class="operator">::</span>mousePressEvent(<span class="type"><a href="../qtgui/qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event) { <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> square <span class="operator">=</span> targetSquare(event<span class="operator">-</span><span class="operator">></span>pos()); <span class="keyword">const</span> <span class="type">int</span> found <span class="operator">=</span> findPiece(square); <span class="keyword">if</span> (found <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) <span class="keyword">return</span>; Piece piece <span class="operator">=</span> pieces<span class="operator">.</span>takeAt(found); <span class="keyword">if</span> (piece<span class="operator">.</span>location <span class="operator">=</span><span class="operator">=</span> square<span class="operator">.</span>topLeft() <span class="operator">/</span> pieceSize()) inPlace<span class="operator">-</span><span class="operator">-</span>; update(square); <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> itemData; <span class="type"><a href="../qtcore/qdatastream.html">QDataStream</a></span> dataStream(<span class="operator">&</span>itemData<span class="operator">,</span> <span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>WriteOnly); dataStream <span class="operator"><</span><span class="operator"><</span> piece<span class="operator">.</span>pixmap <span class="operator"><</span><span class="operator"><</span> piece<span class="operator">.</span>location; <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>; mimeData<span class="operator">-</span><span class="operator">></span>setData(PiecesList<span class="operator">::</span>puzzleMimeType()<span class="operator">,</span> itemData); <span class="type"><a href="../qtgui/qdrag.html">QDrag</a></span> <span class="operator">*</span>drag <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtgui/qdrag.html">QDrag</a></span>(<span class="keyword">this</span>); drag<span class="operator">-</span><span class="operator">></span>setMimeData(mimeData); drag<span class="operator">-</span><span class="operator">></span>setHotSpot(event<span class="operator">-</span><span class="operator">></span>pos() <span class="operator">-</span> square<span class="operator">.</span>topLeft()); drag<span class="operator">-</span><span class="operator">></span>setPixmap(piece<span class="operator">.</span>pixmap); <span class="keyword">if</span> (drag<span class="operator">-</span><span class="operator">></span>exec(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>MoveAction) <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>MoveAction) { pieces<span class="operator">.</span>insert(found<span class="operator">,</span> piece); update(targetSquare(event<span class="operator">-</span><span class="operator">></span>pos())); <span class="keyword">if</span> (piece<span class="operator">.</span>location <span class="operator">=</span><span class="operator">=</span> square<span class="operator">.</span>topLeft() <span class="operator">/</span> pieceSize()) inPlace<span class="operator">+</span><span class="operator">+</span>; } } <span class="type">void</span> PuzzleWidget<span class="operator">::</span>paintEvent(<span class="type"><a href="../qtgui/qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event) { <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="keyword">this</span>); painter<span class="operator">.</span>fillRect(event<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white); <span class="keyword">if</span> (highlightedRect<span class="operator">.</span>isValid()) { painter<span class="operator">.</span>setBrush(<span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="string">"#ffcccc"</span>)); painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoPen); painter<span class="operator">.</span>drawRect(highlightedRect<span class="operator">.</span>adjusted(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1</span>)); } <span class="keyword">for</span> (<span class="keyword">const</span> Piece <span class="operator">&</span>piece : pieces) painter<span class="operator">.</span>drawPixmap(piece<span class="operator">.</span>rect<span class="operator">,</span> piece<span class="operator">.</span>pixmap); } <span class="keyword">const</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> PuzzleWidget<span class="operator">::</span>targetSquare(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> <span class="operator">&</span>position) <span class="keyword">const</span> { <span class="keyword">return</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(position <span class="operator">/</span> pieceSize() <span class="operator">*</span> pieceSize()<span class="operator">,</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(pieceSize()<span class="operator">,</span> pieceSize())); } <span class="type">int</span> PuzzleWidget<span class="operator">::</span>pieceSize() <span class="keyword">const</span> { <span class="keyword">return</span> m_ImageSize <span class="operator">/</span> <span class="number">5</span>; } <span class="type">int</span> PuzzleWidget<span class="operator">::</span>imageSize() <span class="keyword">const</span> { <span class="keyword">return</span> m_ImageSize; } </pre> </div> <!-- @@@draganddrop/puzzle/puzzlewidget.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>