<?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>coloritem.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-graphicsview-dragdroprobot-example.html">Drag and Drop Robot Example</a></td><td >coloritem.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">coloritem.cpp Example File</h1> <span class="subtitle">graphicsview/dragdroprobot/coloritem.cpp</span> <!-- $$$graphicsview/dragdroprobot/coloritem.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 <QtWidgets></span> <span class="preprocessor">#include "coloritem.h"</span> ColorItem<span class="operator">::</span>ColorItem() : color(<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">256</span>)<span class="operator">,</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">256</span>)<span class="operator">,</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">256</span>)) { setToolTip(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"QColor(%1, %2, %3)\n%4"</span>) <span class="operator">.</span>arg(color<span class="operator">.</span>red())<span class="operator">.</span>arg(color<span class="operator">.</span>green())<span class="operator">.</span>arg(color<span class="operator">.</span>blue()) <span class="operator">.</span>arg(<span class="string">"Click and drag this color onto the robot!"</span>)); setCursor(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>OpenHandCursor); setAcceptedMouseButtons(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>LeftButton); } <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> ColorItem<span class="operator">::</span>boundingRect() <span class="keyword">const</span> { <span class="keyword">return</span> <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span>(<span class="operator">-</span><span class="number">15.5</span><span class="operator">,</span> <span class="operator">-</span><span class="number">15.5</span><span class="operator">,</span> <span class="number">34</span><span class="operator">,</span> <span class="number">34</span>); } <span class="type">void</span> ColorItem<span class="operator">::</span>paint(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstyleoptiongraphicsitem.html">QStyleOptionGraphicsItem</a></span> <span class="operator">*</span>option<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>widget) { Q_UNUSED(option); Q_UNUSED(widget); painter<span class="operator">-</span><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><span class="operator">></span>setBrush(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>darkGray); painter<span class="operator">-</span><span class="operator">></span>drawEllipse(<span class="operator">-</span><span class="number">12</span><span class="operator">,</span> <span class="operator">-</span><span class="number">12</span><span class="operator">,</span> <span class="number">30</span><span class="operator">,</span> <span class="number">30</span>); painter<span class="operator">-</span><span class="operator">></span>setPen(<span class="type"><a href="../qtgui/qpen.html">QPen</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black<span class="operator">,</span> <span class="number">1</span>)); painter<span class="operator">-</span><span class="operator">></span>setBrush(<span class="type"><a href="../qtgui/qbrush.html">QBrush</a></span>(color)); painter<span class="operator">-</span><span class="operator">></span>drawEllipse(<span class="operator">-</span><span class="number">15</span><span class="operator">,</span> <span class="operator">-</span><span class="number">15</span><span class="operator">,</span> <span class="number">30</span><span class="operator">,</span> <span class="number">30</span>); } <span class="type">void</span> ColorItem<span class="operator">::</span>mousePressEvent(<span class="type"><a href="qgraphicsscenemouseevent.html">QGraphicsSceneMouseEvent</a></span> <span class="operator">*</span>) { setCursor(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ClosedHandCursor); } <span class="type">void</span> ColorItem<span class="operator">::</span>mouseMoveEvent(<span class="type"><a href="qgraphicsscenemouseevent.html">QGraphicsSceneMouseEvent</a></span> <span class="operator">*</span>event) { <span class="keyword">if</span> (<span class="type"><a href="../qtcore/qlinef.html">QLineF</a></span>(event<span class="operator">-</span><span class="operator">></span>screenPos()<span class="operator">,</span> event<span class="operator">-</span><span class="operator">></span>buttonDownScreenPos(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>LeftButton)) <span class="operator">.</span>length() <span class="operator"><</span> <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>startDragDistance()) { <span class="keyword">return</span>; } <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>(event<span class="operator">-</span><span class="operator">></span>widget()); <span class="type"><a href="../qtcore/qmimedata.html">QMimeData</a></span> <span class="operator">*</span>mime <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qmimedata.html">QMimeData</a></span>; drag<span class="operator">-</span><span class="operator">></span>setMimeData(mime); <span class="keyword">static</span> <span class="type">int</span> n <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">if</span> (n<span class="operator">+</span><span class="operator">+</span> <span class="operator">></span> <span class="number">2</span> <span class="operator">&</span><span class="operator">&</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">3</span>) <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) { <span class="type"><a href="../qtgui/qimage.html">QImage</a></span> image(<span class="string">":/images/head.png"</span>); mime<span class="operator">-</span><span class="operator">></span>setImageData(image); drag<span class="operator">-</span><span class="operator">></span>setPixmap(<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span><span class="operator">::</span>fromImage(image)<span class="operator">.</span>scaled(<span class="number">30</span><span class="operator">,</span> <span class="number">40</span>)); drag<span class="operator">-</span><span class="operator">></span>setHotSpot(<span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span>(<span class="number">15</span><span class="operator">,</span> <span class="number">30</span>)); } <span class="keyword">else</span> { mime<span class="operator">-</span><span class="operator">></span>setColorData(color); mime<span class="operator">-</span><span class="operator">></span>setText(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"#%1%2%3"</span>) <span class="operator">.</span>arg(color<span class="operator">.</span>red()<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">16</span><span class="operator">,</span> QLatin1Char(<span class="char">'0'</span>)) <span class="operator">.</span>arg(color<span class="operator">.</span>green()<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">16</span><span class="operator">,</span> QLatin1Char(<span class="char">'0'</span>)) <span class="operator">.</span>arg(color<span class="operator">.</span>blue()<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">16</span><span class="operator">,</span> QLatin1Char(<span class="char">'0'</span>))); <span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> pixmap(<span class="number">34</span><span class="operator">,</span> <span class="number">34</span>); pixmap<span class="operator">.</span>fill(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white); <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>pixmap); painter<span class="operator">.</span>translate(<span class="number">15</span><span class="operator">,</span> <span class="number">15</span>); painter<span class="operator">.</span>setRenderHint(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing); paint(<span class="operator">&</span>painter<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>); painter<span class="operator">.</span>end(); pixmap<span class="operator">.</span>setMask(pixmap<span class="operator">.</span>createHeuristicMask()); drag<span class="operator">-</span><span class="operator">></span>setPixmap(pixmap); drag<span class="operator">-</span><span class="operator">></span>setHotSpot(<span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span>(<span class="number">15</span><span class="operator">,</span> <span class="number">20</span>)); } drag<span class="operator">-</span><span class="operator">></span>exec(); setCursor(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>OpenHandCursor); } <span class="type">void</span> ColorItem<span class="operator">::</span>mouseReleaseEvent(<span class="type"><a href="qgraphicsscenemouseevent.html">QGraphicsSceneMouseEvent</a></span> <span class="operator">*</span>) { setCursor(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>OpenHandCursor); } </pre> </div> <!-- @@@graphicsview/dragdroprobot/coloritem.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>