<?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>layoutitem.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-basicgraphicslayouts-example.html">Basic Graphics Layouts Example</a></td><td >layoutitem.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">layoutitem.cpp Example File</h1> <span class="subtitle">graphicsview/basicgraphicslayouts/layoutitem.cpp</span> <!-- $$$graphicsview/basicgraphicslayouts/layoutitem.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 "layoutitem.h"</span> <span class="preprocessor">#include <QGradient></span> <span class="preprocessor">#include <QGraphicsLinearLayout></span> <span class="preprocessor">#include <QPainter></span> LayoutItem<span class="operator">::</span>LayoutItem(<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>parent<span class="comment">/* = 0*/</span>) : <span class="type"><a href="qgraphicslayoutitem.html">QGraphicsLayoutItem</a></span>()<span class="operator">,</span> <span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span>(parent) { m_pix <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span>(QLatin1String(<span class="string">":/images/block.png"</span>)); setGraphicsItem(<span class="keyword">this</span>); } LayoutItem<span class="operator">::</span><span class="operator">~</span>LayoutItem() { <span class="keyword">delete</span> m_pix; } <span class="type">void</span> LayoutItem<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 <span class="comment">/*= 0*/</span>) { Q_UNUSED(widget); Q_UNUSED(option); <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> frame(<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span><span class="number">0</span>)<span class="operator">,</span> geometry()<span class="operator">.</span>size()); <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> w <span class="operator">=</span> m_pix<span class="operator">-</span><span class="operator">></span>width(); <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> h <span class="operator">=</span> m_pix<span class="operator">-</span><span class="operator">></span>height(); <span class="type"><a href="../qtgui/qgradient.html#QGradientStops-typedef">QGradientStops</a></span> stops; <span class="comment">// paint a background rect (with gradient)</span> <span class="type"><a href="../qtgui/qlineargradient.html">QLinearGradient</a></span> gradient(frame<span class="operator">.</span>topLeft()<span class="operator">,</span> frame<span class="operator">.</span>topLeft() <span class="operator">+</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">200</span><span class="operator">,</span><span class="number">200</span>)); stops <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.0</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="number">60</span><span class="operator">,</span> <span class="number">60</span><span class="operator">,</span> <span class="number">60</span>)); stops <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(frame<span class="operator">.</span>height() <span class="operator">/</span> <span class="number">2</span> <span class="operator">/</span> frame<span class="operator">.</span>height()<span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="number">102</span><span class="operator">,</span> <span class="number">176</span><span class="operator">,</span> <span class="number">54</span>)); <span class="comment">//stops << QGradientStop(((frame.height() + h)/2 )/frame.height(), QColor(157, 195, 55));</span> stops <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">1.0</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="number">215</span><span class="operator">,</span> <span class="number">215</span><span class="operator">,</span> <span class="number">215</span>)); gradient<span class="operator">.</span>setStops(stops); painter<span class="operator">-</span><span class="operator">></span>setBrush(<span class="type"><a href="../qtgui/qbrush.html">QBrush</a></span>(gradient)); painter<span class="operator">-</span><span class="operator">></span>drawRoundedRect(frame<span class="operator">,</span> <span class="number">10.0</span><span class="operator">,</span> <span class="number">10.0</span>); <span class="comment">// paint a rect around the pixmap (with gradient)</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span> pixpos <span class="operator">=</span> frame<span class="operator">.</span>center() <span class="operator">-</span> (<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(w<span class="operator">,</span> h) <span class="operator">/</span> <span class="number">2</span>); <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> innerFrame(pixpos<span class="operator">,</span> <span class="type"><a href="../qtcore/qsizef.html">QSizeF</a></span>(w<span class="operator">,</span> h)); innerFrame<span class="operator">.</span>adjust(<span class="operator">-</span><span class="number">4</span><span class="operator">,</span> <span class="operator">-</span><span class="number">4</span><span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">4</span>); gradient<span class="operator">.</span>setStart(innerFrame<span class="operator">.</span>topLeft()); gradient<span class="operator">.</span>setFinalStop(innerFrame<span class="operator">.</span>bottomRight()); stops<span class="operator">.</span>clear(); stops <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.0</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="number">215</span><span class="operator">,</span> <span class="number">255</span><span class="operator">,</span> <span class="number">200</span>)); stops <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">0.5</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="number">102</span><span class="operator">,</span> <span class="number">176</span><span class="operator">,</span> <span class="number">54</span>)); stops <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtgui/qgradient.html#QGradientStop-typedef">QGradientStop</a></span>(<span class="number">1.0</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)); gradient<span class="operator">.</span>setStops(stops); painter<span class="operator">-</span><span class="operator">></span>setBrush(<span class="type"><a href="../qtgui/qbrush.html">QBrush</a></span>(gradient)); painter<span class="operator">-</span><span class="operator">></span>drawRoundedRect(innerFrame<span class="operator">,</span> <span class="number">10.0</span><span class="operator">,</span> <span class="number">10.0</span>); painter<span class="operator">-</span><span class="operator">></span>drawPixmap(pixpos<span class="operator">,</span> <span class="operator">*</span>m_pix); } <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> LayoutItem<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="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span><span class="number">0</span>)<span class="operator">,</span> geometry()<span class="operator">.</span>size()); } <span class="type">void</span> LayoutItem<span class="operator">::</span>setGeometry(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> <span class="operator">&</span>geom) { prepareGeometryChange(); <span class="type"><a href="qgraphicslayoutitem.html">QGraphicsLayoutItem</a></span><span class="operator">::</span>setGeometry(geom); setPos(geom<span class="operator">.</span>topLeft()); } <span class="type"><a href="../qtcore/qsizef.html">QSizeF</a></span> LayoutItem<span class="operator">::</span>sizeHint(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>SizeHint which<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qsizef.html">QSizeF</a></span> <span class="operator">&</span>constraint) <span class="keyword">const</span> { <span class="keyword">switch</span> (which) { <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>MinimumSize: <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>PreferredSize: <span class="comment">// Do not allow a size smaller than the pixmap with two frames around it.</span> <span class="keyword">return</span> m_pix<span class="operator">-</span><span class="operator">></span>size() <span class="operator">+</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(<span class="number">12</span><span class="operator">,</span> <span class="number">12</span>); <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>MaximumSize: <span class="keyword">return</span> <span class="type"><a href="../qtcore/qsizef.html">QSizeF</a></span>(<span class="number">1000</span><span class="operator">,</span><span class="number">1000</span>); <span class="keyword">default</span>: <span class="keyword">break</span>; } <span class="keyword">return</span> constraint; } </pre> </div> <!-- @@@graphicsview/basicgraphicslayouts/layoutitem.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>