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<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>
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<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.
**
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** 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.
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<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>
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<!-- @@@books/bookdelegate.cpp -->
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