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<h1 class="title">window.cpp Example File</h1>
<span class="subtitle">sqlwidgetmapper/window.cpp</span>
<!-- $$$sqlwidgetmapper/window.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
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<span class="preprocessor">#include <QtWidgets></span>
<span class="preprocessor">#include <QtSql></span>
<span class="preprocessor">#include "window.h"</span>
Window<span class="operator">::</span>Window(<span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span>(parent)
{
setupModel();
nameLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qlabel.html">QLabel</a></span>(tr(<span class="string">"Na&me:"</span>));
nameEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qlineedit.html">QLineEdit</a></span>();
addressLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qlabel.html">QLabel</a></span>(tr(<span class="string">"&Address:"</span>));
addressEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qtextedit.html">QTextEdit</a></span>();
typeLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qlabel.html">QLabel</a></span>(tr(<span class="string">"&Type:"</span>));
typeComboBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qcombobox.html">QComboBox</a></span>();
nextButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qpushbutton.html">QPushButton</a></span>(tr(<span class="string">"&Next"</span>));
previousButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qpushbutton.html">QPushButton</a></span>(tr(<span class="string">"&Previous"</span>));
nameLabel<span class="operator">-</span><span class="operator">></span>setBuddy(nameEdit);
addressLabel<span class="operator">-</span><span class="operator">></span>setBuddy(addressEdit);
typeLabel<span class="operator">-</span><span class="operator">></span>setBuddy(typeComboBox);
<span class="type"><a href="qsqltablemodel.html">QSqlTableModel</a></span> <span class="operator">*</span>relModel <span class="operator">=</span> model<span class="operator">-</span><span class="operator">></span>relationModel(typeIndex);
typeComboBox<span class="operator">-</span><span class="operator">></span>setModel(relModel);
typeComboBox<span class="operator">-</span><span class="operator">></span>setModelColumn(relModel<span class="operator">-</span><span class="operator">></span>fieldIndex(<span class="string">"description"</span>));
mapper <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qdatawidgetmapper.html">QDataWidgetMapper</a></span>(<span class="keyword">this</span>);
mapper<span class="operator">-</span><span class="operator">></span>setModel(model);
mapper<span class="operator">-</span><span class="operator">></span>setItemDelegate(<span class="keyword">new</span> <span class="type"><a href="qsqlrelationaldelegate.html">QSqlRelationalDelegate</a></span>(<span class="keyword">this</span>));
mapper<span class="operator">-</span><span class="operator">></span>addMapping(nameEdit<span class="operator">,</span> model<span class="operator">-</span><span class="operator">></span>fieldIndex(<span class="string">"name"</span>));
mapper<span class="operator">-</span><span class="operator">></span>addMapping(addressEdit<span class="operator">,</span> model<span class="operator">-</span><span class="operator">></span>fieldIndex(<span class="string">"address"</span>));
mapper<span class="operator">-</span><span class="operator">></span>addMapping(typeComboBox<span class="operator">,</span> typeIndex);
connect(previousButton<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qpushbutton.html">QPushButton</a></span><span class="operator">::</span>clicked<span class="operator">,</span>
mapper<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qdatawidgetmapper.html">QDataWidgetMapper</a></span><span class="operator">::</span>toPrevious);
connect(nextButton<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qpushbutton.html">QPushButton</a></span><span class="operator">::</span>clicked<span class="operator">,</span>
mapper<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qdatawidgetmapper.html">QDataWidgetMapper</a></span><span class="operator">::</span>toNext);
connect(mapper<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qdatawidgetmapper.html">QDataWidgetMapper</a></span><span class="operator">::</span>currentIndexChanged<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Window<span class="operator">::</span>updateButtons);
<span class="type"><a href="../qtwidgets/qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qgridlayout.html">QGridLayout</a></span>();
layout<span class="operator">-</span><span class="operator">></span>addWidget(nameLabel<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(nameEdit<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(previousButton<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(addressLabel<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(addressEdit<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">1</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(nextButton<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(typeLabel<span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(typeComboBox<span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
setLayout(layout);
setWindowTitle(tr(<span class="string">"SQL Widget Mapper"</span>));
mapper<span class="operator">-</span><span class="operator">></span>toFirst();
}
<span class="type">void</span> Window<span class="operator">::</span>setupModel()
{
<span class="type"><a href="qsqldatabase.html">QSqlDatabase</a></span> db <span class="operator">=</span> <span class="type"><a href="qsqldatabase.html">QSqlDatabase</a></span><span class="operator">::</span>addDatabase(<span class="string">"QSQLITE"</span>);
db<span class="operator">.</span>setDatabaseName(<span class="string">":memory:"</span>);
<span class="keyword">if</span> (<span class="operator">!</span>db<span class="operator">.</span>open()) {
<span class="type"><a href="../qtwidgets/qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>critical(<span class="number">0</span><span class="operator">,</span> tr(<span class="string">"Cannot open database"</span>)<span class="operator">,</span>
tr(<span class="string">"Unable to establish a database connection.\n"</span>
<span class="string">"This example needs SQLite support. Please read "</span>
<span class="string">"the Qt SQL driver documentation for information how "</span>
<span class="string">"to build it."</span>)<span class="operator">,</span> <span class="type"><a href="../qtwidgets/qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Cancel);
<span class="keyword">return</span>;
}
<span class="type"><a href="qsqlquery.html">QSqlQuery</a></span> query;
query<span class="operator">.</span>exec(<span class="string">"create table person (id int primary key, "</span>
<span class="string">"name varchar(20), address varchar(200), typeid int)"</span>);
query<span class="operator">.</span>exec(<span class="string">"insert into person values(1, 'Alice', "</span>
<span class="string">"'<qt>123 Main Street<br/>Market Town</qt>', 101)"</span>);
query<span class="operator">.</span>exec(<span class="string">"insert into person values(2, 'Bob', "</span>
<span class="string">"'<qt>PO Box 32<br/>Mail Handling Service"</span>
<span class="string">"<br/>Service City</qt>', 102)"</span>);
query<span class="operator">.</span>exec(<span class="string">"insert into person values(3, 'Carol', "</span>
<span class="string">"'<qt>The Lighthouse<br/>Remote Island</qt>', 103)"</span>);
query<span class="operator">.</span>exec(<span class="string">"insert into person values(4, 'Donald', "</span>
<span class="string">"'<qt>47338 Park Avenue<br/>Big City</qt>', 101)"</span>);
query<span class="operator">.</span>exec(<span class="string">"insert into person values(5, 'Emma', "</span>
<span class="string">"'<qt>Research Station<br/>Base Camp<br/>"</span>
<span class="string">"Big Mountain</qt>', 103)"</span>);
query<span class="operator">.</span>exec(<span class="string">"create table addresstype (id int, description varchar(20))"</span>);
query<span class="operator">.</span>exec(<span class="string">"insert into addresstype values(101, 'Home')"</span>);
query<span class="operator">.</span>exec(<span class="string">"insert into addresstype values(102, 'Work')"</span>);
query<span class="operator">.</span>exec(<span class="string">"insert into addresstype values(103, 'Other')"</span>);
model <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsqlrelationaltablemodel.html">QSqlRelationalTableModel</a></span>(<span class="keyword">this</span>);
model<span class="operator">-</span><span class="operator">></span>setTable(<span class="string">"person"</span>);
model<span class="operator">-</span><span class="operator">></span>setEditStrategy(<span class="type"><a href="qsqltablemodel.html">QSqlTableModel</a></span><span class="operator">::</span>OnManualSubmit);
typeIndex <span class="operator">=</span> model<span class="operator">-</span><span class="operator">></span>fieldIndex(<span class="string">"typeid"</span>);
model<span class="operator">-</span><span class="operator">></span>setRelation(typeIndex<span class="operator">,</span>
<span class="type"><a href="qsqlrelation.html">QSqlRelation</a></span>(<span class="string">"addresstype"</span><span class="operator">,</span> <span class="string">"id"</span><span class="operator">,</span> <span class="string">"description"</span>));
model<span class="operator">-</span><span class="operator">></span>select();
}
<span class="type">void</span> Window<span class="operator">::</span>updateButtons(<span class="type">int</span> row)
{
previousButton<span class="operator">-</span><span class="operator">></span>setEnabled(row <span class="operator">></span> <span class="number">0</span>);
nextButton<span class="operator">-</span><span class="operator">></span>setEnabled(row <span class="operator"><</span> model<span class="operator">-</span><span class="operator">></span>rowCount() <span class="operator">-</span> <span class="number">1</span>);
}
</pre>
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<!-- @@@sqlwidgetmapper/window.cpp -->
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