<?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>bookdelegate.cpp Example File | Qt SQL 5.9</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 5.9</td><td ><a href="qtsql-index.html">Qt SQL</a></td><td ><a href="qtsql-books-example.html">Books</a></td><td >bookdelegate.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</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">bookdelegate.cpp Example File</h1> <span class="subtitle">books/bookdelegate.cpp</span> <!-- $$$books/bookdelegate.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 demonstration applications 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 "bookdelegate.h"</span> <span class="preprocessor">#include <QtWidgets></span> BookDelegate<span class="operator">::</span>BookDelegate(<span class="type"><a href="../qtcore/qobject.html">QObject</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="qsqlrelationaldelegate.html">QSqlRelationalDelegate</a></span>(parent)<span class="operator">,</span> star(<span class="type">QPixmap</span>(<span class="string">":images/star.png"</span>)) { } <span class="type">void</span> BookDelegate<span class="operator">::</span>paint(<span class="type">QPainter</span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtwidgets/qstyleoptionviewitem.html">QStyleOptionViewItem</a></span> <span class="operator">&</span>option<span class="operator">,</span> <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>column() <span class="operator">!</span><span class="operator">=</span> <span class="number">5</span>) { <span class="type"><a href="../qtwidgets/qstyleoptionviewitem.html">QStyleOptionViewItem</a></span> opt <span class="operator">=</span> option; opt<span class="operator">.</span>rect<span class="operator">.</span>adjust(<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="comment">// since we draw the grid ourselves</span> <span class="type"><a href="qsqlrelationaldelegate.html">QSqlRelationalDelegate</a></span><span class="operator">::</span>paint(painter<span class="operator">,</span> opt<span class="operator">,</span> index); } <span class="keyword">else</span> { <span class="keyword">const</span> <span class="type"><a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a></span> <span class="operator">*</span>model <span class="operator">=</span> index<span class="operator">.</span>model(); <span class="type">QPalette</span><span class="operator">::</span>ColorGroup cg <span class="operator">=</span> (option<span class="operator">.</span>state <span class="operator">&</span> <span class="type"><a href="../qtwidgets/qstyle.html">QStyle</a></span><span class="operator">::</span>State_Enabled) <span class="operator">?</span> (option<span class="operator">.</span>state <span class="operator">&</span> <span class="type"><a href="../qtwidgets/qstyle.html">QStyle</a></span><span class="operator">::</span>State_Active) <span class="operator">?</span> <span class="type">QPalette</span><span class="operator">::</span>Normal : <span class="type">QPalette</span><span class="operator">::</span>Inactive : <span class="type">QPalette</span><span class="operator">::</span>Disabled; <span class="keyword">if</span> (option<span class="operator">.</span>state <span class="operator">&</span> <span class="type"><a href="../qtwidgets/qstyle.html">QStyle</a></span><span class="operator">::</span>State_Selected) painter<span class="operator">-</span><span class="operator">></span>fillRect(option<span class="operator">.</span>rect<span class="operator">,</span> option<span class="operator">.</span>palette<span class="operator">.</span>color(cg<span class="operator">,</span> <span class="type">QPalette</span><span class="operator">::</span>Highlight)); <span class="type">int</span> rating <span class="operator">=</span> model<span class="operator">-</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>DisplayRole)<span class="operator">.</span>toInt(); <span class="type">int</span> width <span class="operator">=</span> star<span class="operator">.</span>width(); <span class="type">int</span> height <span class="operator">=</span> star<span class="operator">.</span>height(); <span class="type">int</span> x <span class="operator">=</span> option<span class="operator">.</span>rect<span class="operator">.</span>x(); <span class="type">int</span> y <span class="operator">=</span> option<span class="operator">.</span>rect<span class="operator">.</span>y() <span class="operator">+</span> (option<span class="operator">.</span>rect<span class="operator">.</span>height() <span class="operator">/</span> <span class="number">2</span>) <span class="operator">-</span> (height <span class="operator">/</span> <span class="number">2</span>); <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> rating; <span class="operator">+</span><span class="operator">+</span>i) { painter<span class="operator">-</span><span class="operator">></span>drawPixmap(x<span class="operator">,</span> y<span class="operator">,</span> star); x <span class="operator">+</span><span class="operator">=</span> width; } drawFocus(painter<span class="operator">,</span> option<span class="operator">,</span> option<span class="operator">.</span>rect<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="comment">// since we draw the grid ourselves</span> } <span class="type">QPen</span> pen <span class="operator">=</span> painter<span class="operator">-</span><span class="operator">></span>pen(); painter<span class="operator">-</span><span class="operator">></span>setPen(option<span class="operator">.</span>palette<span class="operator">.</span>color(<span class="type">QPalette</span><span class="operator">::</span>Mid)); painter<span class="operator">-</span><span class="operator">></span>drawLine(option<span class="operator">.</span>rect<span class="operator">.</span>bottomLeft()<span class="operator">,</span> option<span class="operator">.</span>rect<span class="operator">.</span>bottomRight()); painter<span class="operator">-</span><span class="operator">></span>drawLine(option<span class="operator">.</span>rect<span class="operator">.</span>topRight()<span class="operator">,</span> option<span class="operator">.</span>rect<span class="operator">.</span>bottomRight()); painter<span class="operator">-</span><span class="operator">></span>setPen(pen); } <span class="type"><a href="../qtcore/qsize.html">QSize</a></span> BookDelegate<span class="operator">::</span>sizeHint(<span class="keyword">const</span> <span class="type"><a href="../qtwidgets/qstyleoptionviewitem.html">QStyleOptionViewItem</a></span> <span class="operator">&</span>option<span class="operator">,</span> <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>column() <span class="operator">=</span><span class="operator">=</span> <span class="number">5</span>) <span class="keyword">return</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(<span class="number">5</span> <span class="operator">*</span> star<span class="operator">.</span>width()<span class="operator">,</span> star<span class="operator">.</span>height()) <span class="operator">+</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(<span class="number">1</span><span class="operator">,</span> <span class="number">1</span>); <span class="keyword">return</span> <span class="type"><a href="qsqlrelationaldelegate.html">QSqlRelationalDelegate</a></span><span class="operator">::</span>sizeHint(option<span class="operator">,</span> index) <span class="operator">+</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(<span class="number">1</span><span class="operator">,</span> <span class="number">1</span>); <span class="comment">// since we draw the grid ourselves</span> } bool BookDelegate<span class="operator">::</span>editorEvent(<span class="type"><a href="../qtcore/qevent.html">QEvent</a></span> <span class="operator">*</span>event<span class="operator">,</span> <span class="type"><a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a></span> <span class="operator">*</span>model<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtwidgets/qstyleoptionviewitem.html">QStyleOptionViewItem</a></span> <span class="operator">&</span>option<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>index) { <span class="keyword">if</span> (index<span class="operator">.</span>column() <span class="operator">!</span><span class="operator">=</span> <span class="number">5</span>) <span class="keyword">return</span> <span class="type"><a href="qsqlrelationaldelegate.html">QSqlRelationalDelegate</a></span><span class="operator">::</span>editorEvent(event<span class="operator">,</span> model<span class="operator">,</span> option<span class="operator">,</span> index); <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>type() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>MouseButtonPress) { <span class="type">QMouseEvent</span> <span class="operator">*</span>mouseEvent <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type">QMouseEvent</span><span class="operator">*</span><span class="operator">></span>(event); <span class="type">int</span> stars <span class="operator">=</span> <a href="../qtcore/qtglobal.html#qBound">qBound</a>(<span class="number">0</span><span class="operator">,</span> <span class="type">int</span>(<span class="number">0.7</span> <span class="operator">+</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span>(mouseEvent<span class="operator">-</span><span class="operator">></span>pos()<span class="operator">.</span>x() <span class="operator">-</span> option<span class="operator">.</span>rect<span class="operator">.</span>x()) <span class="operator">/</span> star<span class="operator">.</span>width())<span class="operator">,</span> <span class="number">5</span>); model<span class="operator">-</span><span class="operator">></span>setData(index<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(stars)); <span class="keyword">return</span> <span class="keyword">false</span>; <span class="comment">//so that the selection can change</span> } <span class="keyword">return</span> <span class="keyword">true</span>; } <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>BookDelegate<span class="operator">::</span>createEditor(<span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>parent<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtwidgets/qstyleoptionviewitem.html">QStyleOptionViewItem</a></span> <span class="operator">&</span>option<span class="operator">,</span> <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>column() <span class="operator">!</span><span class="operator">=</span> <span class="number">4</span>) <span class="keyword">return</span> <span class="type"><a href="qsqlrelationaldelegate.html">QSqlRelationalDelegate</a></span><span class="operator">::</span>createEditor(parent<span class="operator">,</span> option<span class="operator">,</span> index); <span class="comment">// for editing the year, return a spinbox with a range from -1000 to 2100.</span> <span class="type"><a href="../qtwidgets/qspinbox.html">QSpinBox</a></span> <span class="operator">*</span>sb <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qspinbox.html">QSpinBox</a></span>(parent); sb<span class="operator">-</span><span class="operator">></span>setFrame(<span class="keyword">false</span>); sb<span class="operator">-</span><span class="operator">></span>setMaximum(<span class="number">2100</span>); sb<span class="operator">-</span><span class="operator">></span>setMinimum(<span class="operator">-</span><span class="number">1000</span>); <span class="keyword">return</span> sb; } </pre> </div> <!-- @@@books/bookdelegate.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 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>