<?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>view.cpp Example File | Qt SQL 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="qtsql-index.html">Qt SQL</a></td><td ><a href="qtsql-drilldown-example.html">Drill Down Example</a></td><td >view.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtsql-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">view.cpp Example File</h1> <span class="subtitle">drilldown/view.cpp</span> <!-- $$$drilldown/view.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 "informationwindow.h"</span> <span class="preprocessor">#include "imageitem.h"</span> <span class="preprocessor">#include "view.h"</span> View<span class="operator">::</span>View(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>items<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>images<span class="operator">,</span> <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="../qtwidgets/qgraphicsview.html">QGraphicsView</a></span>(parent) { itemTable <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsqlrelationaltablemodel.html">QSqlRelationalTableModel</a></span>(<span class="keyword">this</span>); itemTable<span class="operator">-</span><span class="operator">></span>setTable(items); itemTable<span class="operator">-</span><span class="operator">></span>setRelation(<span class="number">1</span><span class="operator">,</span> <span class="type"><a href="qsqlrelation.html">QSqlRelation</a></span>(images<span class="operator">,</span> <span class="string">"itemid"</span><span class="operator">,</span> <span class="string">"file"</span>)); itemTable<span class="operator">-</span><span class="operator">></span>select(); scene <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qgraphicsscene.html">QGraphicsScene</a></span>(<span class="keyword">this</span>); scene<span class="operator">-</span><span class="operator">></span>setSceneRect(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">465</span><span class="operator">,</span> <span class="number">365</span>); setScene(scene); addItems(); setMinimumSize(<span class="number">470</span><span class="operator">,</span> <span class="number">370</span>); setMaximumSize(<span class="number">470</span><span class="operator">,</span> <span class="number">370</span>); <span class="type">QLinearGradient</span> gradient(<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> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">370</span>)); gradient<span class="operator">.</span>setColorAt(<span class="number">0</span><span class="operator">,</span> <span class="type">QColor</span>(<span class="string">"#868482"</span>)); gradient<span class="operator">.</span>setColorAt(<span class="number">1</span><span class="operator">,</span> <span class="type">QColor</span>(<span class="string">"#5d5b59"</span>)); setBackgroundBrush(gradient); } <span class="type">void</span> View<span class="operator">::</span>addItems() { <span class="type">int</span> itemCount <span class="operator">=</span> itemTable<span class="operator">-</span><span class="operator">></span>rowCount(); <span class="type">int</span> imageOffset <span class="operator">=</span> <span class="number">150</span>; <span class="type">int</span> leftMargin <span class="operator">=</span> <span class="number">70</span>; <span class="type">int</span> topMargin <span class="operator">=</span> <span class="number">40</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> itemCount; i<span class="operator">+</span><span class="operator">+</span>) { <span class="type"><a href="qsqlrecord.html">QSqlRecord</a></span> record <span class="operator">=</span> itemTable<span class="operator">-</span><span class="operator">></span>record(i); <span class="type">int</span> id <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">"id"</span>)<span class="operator">.</span>toInt(); <span class="type"><a href="../qtcore/qstring.html">QString</a></span> file <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">"file"</span>)<span class="operator">.</span>toString(); <span class="type"><a href="../qtcore/qstring.html">QString</a></span> item <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">"itemtype"</span>)<span class="operator">.</span>toString(); <span class="type">int</span> columnOffset <span class="operator">=</span> ((i <span class="operator">%</span> <span class="number">2</span>) <span class="operator">*</span> <span class="number">37</span>); <span class="type">int</span> x <span class="operator">=</span> ((i <span class="operator">%</span> <span class="number">2</span>) <span class="operator">*</span> imageOffset) <span class="operator">+</span> leftMargin <span class="operator">+</span> columnOffset; <span class="type">int</span> y <span class="operator">=</span> ((i <span class="operator">/</span> <span class="number">2</span>) <span class="operator">*</span> imageOffset) <span class="operator">+</span> topMargin; ImageItem <span class="operator">*</span>image <span class="operator">=</span> <span class="keyword">new</span> ImageItem(id<span class="operator">,</span> <span class="type">QPixmap</span>(<span class="string">":/"</span> <span class="operator">+</span> file)); image<span class="operator">-</span><span class="operator">></span>setData(<span class="number">0</span><span class="operator">,</span> i); image<span class="operator">-</span><span class="operator">></span>setPos(x<span class="operator">,</span> y); scene<span class="operator">-</span><span class="operator">></span>addItem(image); <span class="type"><a href="../qtwidgets/qgraphicstextitem.html">QGraphicsTextItem</a></span> <span class="operator">*</span>label <span class="operator">=</span> scene<span class="operator">-</span><span class="operator">></span>addText(item); label<span class="operator">-</span><span class="operator">></span>setDefaultTextColor(<span class="type">QColor</span>(<span class="string">"#d7d6d5"</span>)); <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span> labelOffset((<span class="number">120</span> <span class="operator">-</span> label<span class="operator">-</span><span class="operator">></span>boundingRect()<span class="operator">.</span>width()) <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> <span class="number">120.0</span>); label<span class="operator">-</span><span class="operator">></span>setPos(<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(x<span class="operator">,</span> y) <span class="operator">+</span> labelOffset); } } <span class="type">void</span> View<span class="operator">::</span>mouseReleaseEvent(<span class="type">QMouseEvent</span> <span class="operator">*</span>event) { <span class="keyword">if</span> (<span class="type"><a href="../qtwidgets/qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> itemAt(event<span class="operator">-</span><span class="operator">></span>pos())) { <span class="keyword">if</span> (ImageItem <span class="operator">*</span>image <span class="operator">=</span> qgraphicsitem_cast<span class="operator"><</span>ImageItem <span class="operator">*</span><span class="operator">></span>(item)) showInformation(image); } <span class="type"><a href="../qtwidgets/qgraphicsview.html">QGraphicsView</a></span><span class="operator">::</span>mouseReleaseEvent(event); } <span class="type">void</span> View<span class="operator">::</span>showInformation(ImageItem <span class="operator">*</span>image) { <span class="type">int</span> id <span class="operator">=</span> image<span class="operator">-</span><span class="operator">></span>id(); <span class="keyword">if</span> (id <span class="operator"><</span> <span class="number">0</span> <span class="operator">|</span><span class="operator">|</span> id <span class="operator">></span><span class="operator">=</span> itemTable<span class="operator">-</span><span class="operator">></span>rowCount()) <span class="keyword">return</span>; InformationWindow <span class="operator">*</span>window <span class="operator">=</span> findWindow(id); <span class="keyword">if</span> (<span class="operator">!</span>window) { window <span class="operator">=</span> <span class="keyword">new</span> InformationWindow(id<span class="operator">,</span> itemTable<span class="operator">,</span> <span class="keyword">this</span>); connect(window<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="type">int</span><span class="operator">,</span><span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span><span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span>InformationWindow<span class="operator">::</span>imageChanged)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="type">int</span><span class="operator">,</span><span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span><span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span>View<span class="operator">::</span>updateImage)); window<span class="operator">-</span><span class="operator">></span>move(pos() <span class="operator">+</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span>(<span class="number">20</span><span class="operator">,</span> <span class="number">40</span>)); window<span class="operator">-</span><span class="operator">></span>show(); informationWindows<span class="operator">.</span>append(window); } <span class="keyword">if</span> (window<span class="operator">-</span><span class="operator">></span>isVisible()) { window<span class="operator">-</span><span class="operator">></span>raise(); window<span class="operator">-</span><span class="operator">></span>activateWindow(); } <span class="keyword">else</span> window<span class="operator">-</span><span class="operator">></span>show(); } <span class="type">void</span> View<span class="operator">::</span>updateImage(<span class="type">int</span> id<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>fileName) { <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="../qtwidgets/qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span><span class="operator">></span> items <span class="operator">=</span> scene<span class="operator">-</span><span class="operator">></span>items(); <span class="keyword">while</span>(<span class="operator">!</span>items<span class="operator">.</span>empty()) { <span class="type"><a href="../qtwidgets/qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> items<span class="operator">.</span>takeFirst(); <span class="keyword">if</span> (ImageItem <span class="operator">*</span>image <span class="operator">=</span> qgraphicsitem_cast<span class="operator"><</span>ImageItem <span class="operator">*</span><span class="operator">></span>(item)) { <span class="keyword">if</span> (image<span class="operator">-</span><span class="operator">></span>id() <span class="operator">=</span><span class="operator">=</span> id){ image<span class="operator">-</span><span class="operator">></span>setPixmap(<span class="type">QPixmap</span>(<span class="string">":/"</span> <span class="operator">+</span>fileName)); image<span class="operator">-</span><span class="operator">></span>adjust(); <span class="keyword">break</span>; } } } } InformationWindow <span class="operator">*</span>View<span class="operator">::</span>findWindow(<span class="type">int</span> id) <span class="keyword">const</span> { <span class="keyword">for</span> (<span class="keyword">auto</span> window : informationWindows) { <span class="keyword">if</span> (window <span class="operator">&</span><span class="operator">&</span> (window<span class="operator">-</span><span class="operator">></span>id() <span class="operator">=</span><span class="operator">=</span> id)) <span class="keyword">return</span> window; } <span class="keyword">return</span> nullptr; } </pre> </div> <!-- @@@drilldown/view.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>