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<td >Qt 5.9</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-painting-fontsampler-example.html">Font Sampler Example</a></td><td >mainwindow.cpp Example File</td></tr></table><table class="buildversion"><tr>
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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="subtitle">painting/fontsampler/mainwindow.cpp</span>
<!-- $$$painting/fontsampler/mainwindow.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 <QtWidgets></span>
<span class="preprocessor">#if defined(QT_PRINTSUPPORT_LIB)</span>
<span class="preprocessor">#include <QtPrintSupport/qtprintsupportglobal.h></span>
<span class="preprocessor">#if QT_CONFIG(printdialog)</span>
<span class="preprocessor">#include <QPrinter></span>
<span class="preprocessor">#include <QPrintDialog></span>
<span class="preprocessor">#if QT_CONFIG(printpreviewdialog)</span>
<span class="preprocessor">#include <QPrintPreviewDialog></span>
<span class="preprocessor">#endif</span>
<span class="preprocessor">#endif</span>
<span class="preprocessor">#endif</span>
<span class="preprocessor">#include "mainwindow.h"</span>
MainWindow<span class="operator">::</span>MainWindow(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qmainwindow.html">QMainWindow</a></span>(parent)
{
setupUi(<span class="keyword">this</span>);
sampleSizes <span class="operator"><</span><span class="operator"><</span> <span class="number">32</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">24</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">16</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">14</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">12</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">8</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">4</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">2</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">1</span>;
markedCount <span class="operator">=</span> <span class="number">0</span>;
setupFontTree();
connect(quitAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> qApp<span class="operator">,</span> SLOT(quit()));
connect(fontTree<span class="operator">,</span> SIGNAL(currentItemChanged(<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span><span class="operator">*</span><span class="operator">,</span><span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span><span class="operator">*</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(showFont(<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span><span class="operator">*</span>)));
connect(fontTree<span class="operator">,</span> SIGNAL(itemChanged(<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span><span class="operator">*</span><span class="operator">,</span><span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(updateStyles(<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span><span class="operator">*</span><span class="operator">,</span><span class="type">int</span>)));
fontTree<span class="operator">-</span><span class="operator">></span>setItemSelected(fontTree<span class="operator">-</span><span class="operator">></span>topLevelItem(<span class="number">0</span>)<span class="operator">,</span> <span class="keyword">true</span>);
showFont(fontTree<span class="operator">-</span><span class="operator">></span>topLevelItem(<span class="number">0</span>));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>setupFontTree()
{
<span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span> database;
fontTree<span class="operator">-</span><span class="operator">></span>setColumnCount(<span class="number">1</span>);
fontTree<span class="operator">-</span><span class="operator">></span>setHeaderLabels(<span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span>() <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Font"</span>));
foreach (<span class="type"><a href="../qtcore/qstring.html">QString</a></span> family<span class="operator">,</span> database<span class="operator">.</span>families()) {
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> styles <span class="operator">=</span> database<span class="operator">.</span>styles(family);
<span class="keyword">if</span> (styles<span class="operator">.</span>isEmpty())
<span class="keyword">continue</span>;
<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>familyItem <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span>(fontTree);
familyItem<span class="operator">-</span><span class="operator">></span>setText(<span class="number">0</span><span class="operator">,</span> family);
familyItem<span class="operator">-</span><span class="operator">></span>setCheckState(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Unchecked);
familyItem<span class="operator">-</span><span class="operator">></span>setFlags(familyItem<span class="operator">-</span><span class="operator">></span>flags() <span class="operator">|</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ItemIsAutoTristate);
foreach (<span class="type"><a href="../qtcore/qstring.html">QString</a></span> style<span class="operator">,</span> styles) {
<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>styleItem <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span>(familyItem);
styleItem<span class="operator">-</span><span class="operator">></span>setText(<span class="number">0</span><span class="operator">,</span> style);
styleItem<span class="operator">-</span><span class="operator">></span>setCheckState(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Unchecked);
styleItem<span class="operator">-</span><span class="operator">></span>setData(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(database<span class="operator">.</span>weight(family<span class="operator">,</span> style)));
styleItem<span class="operator">-</span><span class="operator">></span>setData(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole <span class="operator">+</span> <span class="number">1</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(database<span class="operator">.</span>italic(family<span class="operator">,</span> style)));
}
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>on_clearAction_triggered()
{
<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>currentItem <span class="operator">=</span> fontTree<span class="operator">-</span><span class="operator">></span>currentItem();
foreach (<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> fontTree<span class="operator">-</span><span class="operator">></span>selectedItems())
fontTree<span class="operator">-</span><span class="operator">></span>setItemSelected(item<span class="operator">,</span> <span class="keyword">false</span>);
fontTree<span class="operator">-</span><span class="operator">></span>setItemSelected(currentItem<span class="operator">,</span> <span class="keyword">true</span>);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>on_markAction_triggered()
{
markUnmarkFonts(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Checked);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>on_unmarkAction_triggered()
{
markUnmarkFonts(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Unchecked);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>markUnmarkFonts(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>CheckState state)
{
<span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span><span class="operator">></span> items <span class="operator">=</span> fontTree<span class="operator">-</span><span class="operator">></span>selectedItems();
foreach (<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> items) {
<span class="keyword">if</span> (item<span class="operator">-</span><span class="operator">></span>checkState(<span class="number">0</span>) <span class="operator">!</span><span class="operator">=</span> state)
item<span class="operator">-</span><span class="operator">></span>setCheckState(<span class="number">0</span><span class="operator">,</span> state);
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>showFont(<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item)
{
<span class="keyword">if</span> (<span class="operator">!</span>item)
<span class="keyword">return</span>;
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> family;
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> style;
<span class="type">int</span> weight;
bool italic;
<span class="keyword">if</span> (item<span class="operator">-</span><span class="operator">></span>parent()) {
family <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>parent()<span class="operator">-</span><span class="operator">></span>text(<span class="number">0</span>);
style <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>text(<span class="number">0</span>);
weight <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>data(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole)<span class="operator">.</span>toInt();
italic <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>data(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole <span class="operator">+</span> <span class="number">1</span>)<span class="operator">.</span>toBool();
} <span class="keyword">else</span> {
family <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>text(<span class="number">0</span>);
style <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>child(<span class="number">0</span>)<span class="operator">-</span><span class="operator">></span>text(<span class="number">0</span>);
weight <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>child(<span class="number">0</span>)<span class="operator">-</span><span class="operator">></span>data(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole)<span class="operator">.</span>toInt();
italic <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>child(<span class="number">0</span>)<span class="operator">-</span><span class="operator">></span>data(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole <span class="operator">+</span> <span class="number">1</span>)<span class="operator">.</span>toBool();
}
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> oldText <span class="operator">=</span> textEdit<span class="operator">-</span><span class="operator">></span>toPlainText()<span class="operator">.</span>trimmed();
bool modified <span class="operator">=</span> textEdit<span class="operator">-</span><span class="operator">></span>document()<span class="operator">-</span><span class="operator">></span>isModified();
textEdit<span class="operator">-</span><span class="operator">></span>clear();
<span class="type"><a href="../qtgui/qfont.html">QFont</a></span> font(family<span class="operator">,</span> <span class="number">32</span><span class="operator">,</span> weight<span class="operator">,</span> italic);
font<span class="operator">.</span>setStyleName(style);
textEdit<span class="operator">-</span><span class="operator">></span>document()<span class="operator">-</span><span class="operator">></span>setDefaultFont(font);
<span class="type"><a href="../qtgui/qtextcursor.html">QTextCursor</a></span> cursor <span class="operator">=</span> textEdit<span class="operator">-</span><span class="operator">></span>textCursor();
<span class="type"><a href="../qtgui/qtextblockformat.html">QTextBlockFormat</a></span> blockFormat;
blockFormat<span class="operator">.</span>setAlignment(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AlignCenter);
cursor<span class="operator">.</span>insertBlock(blockFormat);
<span class="keyword">if</span> (modified)
cursor<span class="operator">.</span>insertText(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>(oldText));
<span class="keyword">else</span>
cursor<span class="operator">.</span>insertText(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"%1 %2"</span>)<span class="operator">.</span>arg(family)<span class="operator">.</span>arg(style));
textEdit<span class="operator">-</span><span class="operator">></span>document()<span class="operator">-</span><span class="operator">></span>setModified(modified);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>updateStyles(<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> <span class="type">int</span> column)
{
<span class="keyword">if</span> (<span class="operator">!</span>item <span class="operator">|</span><span class="operator">|</span> column <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span>;
<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>CheckState state <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>checkState(<span class="number">0</span>);
<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>parent <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>parent();
<span class="keyword">if</span> (parent) {
<span class="comment">// Only count style items.</span>
<span class="keyword">if</span> (state <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Checked)
<span class="operator">+</span><span class="operator">+</span>markedCount;
<span class="keyword">else</span>
<span class="operator">-</span><span class="operator">-</span>markedCount;
}
printAction<span class="operator">-</span><span class="operator">></span>setEnabled(markedCount <span class="operator">></span> <span class="number">0</span>);
printPreviewAction<span class="operator">-</span><span class="operator">></span>setEnabled(markedCount <span class="operator">></span> <span class="number">0</span>);
}
<span class="type"><a href="../qtcore/qmap.html">QMap</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">,</span> StyleItems<span class="operator">></span> MainWindow<span class="operator">::</span>currentPageMap()
{
<span class="type"><a href="../qtcore/qmap.html">QMap</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">,</span> StyleItems<span class="operator">></span> pageMap;
<span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>; row <span class="operator"><</span> fontTree<span class="operator">-</span><span class="operator">></span>topLevelItemCount(); <span class="operator">+</span><span class="operator">+</span>row) {
<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>familyItem <span class="operator">=</span> fontTree<span class="operator">-</span><span class="operator">></span>topLevelItem(row);
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> family;
<span class="keyword">if</span> (familyItem<span class="operator">-</span><span class="operator">></span>checkState(<span class="number">0</span>) <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Checked) {
family <span class="operator">=</span> familyItem<span class="operator">-</span><span class="operator">></span>text(<span class="number">0</span>);
pageMap<span class="operator">[</span>family<span class="operator">]</span> <span class="operator">=</span> StyleItems();
}
<span class="keyword">for</span> (<span class="type">int</span> childRow <span class="operator">=</span> <span class="number">0</span>; childRow <span class="operator"><</span> familyItem<span class="operator">-</span><span class="operator">></span>childCount(); <span class="operator">+</span><span class="operator">+</span>childRow) {
<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>styleItem <span class="operator">=</span> familyItem<span class="operator">-</span><span class="operator">></span>child(childRow);
<span class="keyword">if</span> (styleItem<span class="operator">-</span><span class="operator">></span>checkState(<span class="number">0</span>) <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Checked)
pageMap<span class="operator">[</span>family<span class="operator">]</span><span class="operator">.</span>append(styleItem);
}
}
<span class="keyword">return</span> pageMap;
}
<span class="type">void</span> MainWindow<span class="operator">::</span>on_printAction_triggered()
{
<span class="preprocessor">#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog)</span>
pageMap <span class="operator">=</span> currentPageMap();
<span class="keyword">if</span> (pageMap<span class="operator">.</span>count() <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span>;
<span class="type">QPrinter</span> printer(<span class="type">QPrinter</span><span class="operator">::</span>HighResolution);
<span class="type">QPrintDialog</span> dialog(<span class="operator">&</span>printer<span class="operator">,</span> <span class="keyword">this</span>);
<span class="keyword">if</span> (dialog<span class="operator">.</span>exec() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qdialog.html">QDialog</a></span><span class="operator">::</span>Accepted)
<span class="keyword">return</span>;
<span class="type">int</span> from <span class="operator">=</span> printer<span class="operator">.</span>fromPage();
<span class="type">int</span> to <span class="operator">=</span> printer<span class="operator">.</span>toPage();
<span class="keyword">if</span> (from <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> to <span class="operator"><</span><span class="operator">=</span> <span class="number">0</span>)
printer<span class="operator">.</span>setFromTo(<span class="number">1</span><span class="operator">,</span> pageMap<span class="operator">.</span>keys()<span class="operator">.</span>count());
printDocument(<span class="operator">&</span>printer);
<span class="preprocessor">#endif</span>
}
<span class="type">void</span> MainWindow<span class="operator">::</span>printDocument(<span class="type">QPrinter</span> <span class="operator">*</span>printer)
{
<span class="preprocessor">#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog)</span>
printer<span class="operator">-</span><span class="operator">></span>setFromTo(<span class="number">1</span><span class="operator">,</span> pageMap<span class="operator">.</span>count());
<span class="type"><a href="qprogressdialog.html">QProgressDialog</a></span> progress(tr(<span class="string">"Preparing font samples..."</span>)<span class="operator">,</span> tr(<span class="string">"&Cancel"</span>)<span class="operator">,</span>
<span class="number">0</span><span class="operator">,</span> pageMap<span class="operator">.</span>count()<span class="operator">,</span> <span class="keyword">this</span>);
progress<span class="operator">.</span>setWindowModality(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ApplicationModal);
progress<span class="operator">.</span>setWindowTitle(tr(<span class="string">"Font Sampler"</span>));
progress<span class="operator">.</span>setMinimum(printer<span class="operator">-</span><span class="operator">></span>fromPage() <span class="operator">-</span> <span class="number">1</span>);
progress<span class="operator">.</span>setMaximum(printer<span class="operator">-</span><span class="operator">></span>toPage());
<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter;
painter<span class="operator">.</span>begin(printer);
bool firstPage <span class="operator">=</span> <span class="keyword">true</span>;
<span class="keyword">for</span> (<span class="type">int</span> page <span class="operator">=</span> printer<span class="operator">-</span><span class="operator">></span>fromPage(); page <span class="operator"><</span><span class="operator">=</span> printer<span class="operator">-</span><span class="operator">></span>toPage(); <span class="operator">+</span><span class="operator">+</span>page) {
<span class="keyword">if</span> (<span class="operator">!</span>firstPage)
printer<span class="operator">-</span><span class="operator">></span>newPage();
qApp<span class="operator">-</span><span class="operator">></span>processEvents();
<span class="keyword">if</span> (progress<span class="operator">.</span>wasCanceled())
<span class="keyword">break</span>;
printPage(page <span class="operator">-</span> <span class="number">1</span><span class="operator">,</span> <span class="operator">&</span>painter<span class="operator">,</span> printer);
progress<span class="operator">.</span>setValue(page);
firstPage <span class="operator">=</span> <span class="keyword">false</span>;
}
painter<span class="operator">.</span>end();
<span class="preprocessor">#endif</span>
}
<span class="type">void</span> MainWindow<span class="operator">::</span>on_printPreviewAction_triggered()
{
<span class="preprocessor">#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printpreviewdialog)</span>
pageMap <span class="operator">=</span> currentPageMap();
<span class="keyword">if</span> (pageMap<span class="operator">.</span>count() <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span>;
<span class="type">QPrinter</span> printer(<span class="type">QPrinter</span><span class="operator">::</span>HighResolution);
<span class="type">QPrintPreviewDialog</span> preview(<span class="operator">&</span>printer<span class="operator">,</span> <span class="keyword">this</span>);
connect(<span class="operator">&</span>preview<span class="operator">,</span> SIGNAL(paintRequested(<span class="type">QPrinter</span><span class="operator">*</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(printDocument(<span class="type">QPrinter</span><span class="operator">*</span>)));
preview<span class="operator">.</span>exec();
<span class="preprocessor">#endif</span>
}
<span class="type">void</span> MainWindow<span class="operator">::</span>printPage(<span class="type">int</span> index<span class="operator">,</span> <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="type">QPrinter</span> <span class="operator">*</span>printer)
{
<span class="preprocessor">#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog)</span>
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> family <span class="operator">=</span> pageMap<span class="operator">.</span>keys()<span class="operator">[</span>index<span class="operator">]</span>;
StyleItems items <span class="operator">=</span> pageMap<span class="operator">[</span>family<span class="operator">]</span>;
<span class="comment">// Find the dimensions of the text on each page.</span>
<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> width <span class="operator">=</span> <span class="number">0.0</span>;
<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> height <span class="operator">=</span> <span class="number">0.0</span>;
foreach (<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> items) {
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> style <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>text(<span class="number">0</span>);
<span class="type">int</span> weight <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>data(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole)<span class="operator">.</span>toInt();
bool italic <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>data(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole <span class="operator">+</span> <span class="number">1</span>)<span class="operator">.</span>toBool();
<span class="comment">// Calculate the maximum width and total height of the text.</span>
foreach (<span class="type">int</span> size<span class="operator">,</span> sampleSizes) {
<span class="type"><a href="../qtgui/qfont.html">QFont</a></span> font(family<span class="operator">,</span> size<span class="operator">,</span> weight<span class="operator">,</span> italic);
font<span class="operator">.</span>setStyleName(style);
font <span class="operator">=</span> <span class="type"><a href="../qtgui/qfont.html">QFont</a></span>(font<span class="operator">,</span> painter<span class="operator">-</span><span class="operator">></span>device());
<span class="type"><a href="../qtgui/qfontmetricsf.html">QFontMetricsF</a></span> fontMetrics(font);
<span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> rect <span class="operator">=</span> fontMetrics<span class="operator">.</span>boundingRect(
<span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"%1 %2"</span>)<span class="operator">.</span>arg(family)<span class="operator">.</span>arg(style));
width <span class="operator">=</span> <a href="../qtcore/qtglobal.html#qMax">qMax</a>(rect<span class="operator">.</span>width()<span class="operator">,</span> width);
height <span class="operator">+</span><span class="operator">=</span> rect<span class="operator">.</span>height();
}
}
<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> xScale <span class="operator">=</span> printer<span class="operator">-</span><span class="operator">></span>pageRect()<span class="operator">.</span>width() <span class="operator">/</span> width;
<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> yScale <span class="operator">=</span> printer<span class="operator">-</span><span class="operator">></span>pageRect()<span class="operator">.</span>height() <span class="operator">/</span> height;
<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> scale <span class="operator">=</span> <a href="../qtcore/qtglobal.html#qMin">qMin</a>(xScale<span class="operator">,</span> yScale);
<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> remainingHeight <span class="operator">=</span> printer<span class="operator">-</span><span class="operator">></span>pageRect()<span class="operator">.</span>height()<span class="operator">/</span>scale <span class="operator">-</span> height;
<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> spaceHeight <span class="operator">=</span> (remainingHeight <span class="operator">/</span> <span class="number">4.0</span>) <span class="operator">/</span> (items<span class="operator">.</span>count() <span class="operator">+</span> <span class="number">1</span>);
<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> interLineHeight <span class="operator">=</span> (remainingHeight <span class="operator">/</span> <span class="number">4.0</span>) <span class="operator">/</span> (sampleSizes<span class="operator">.</span>count() <span class="operator">*</span> items<span class="operator">.</span>count());
painter<span class="operator">-</span><span class="operator">></span>save();
painter<span class="operator">-</span><span class="operator">></span>translate(printer<span class="operator">-</span><span class="operator">></span>pageRect()<span class="operator">.</span>width() <span class="operator">/</span> <span class="number">2.0</span><span class="operator">,</span> printer<span class="operator">-</span><span class="operator">></span>pageRect()<span class="operator">.</span>height() <span class="operator">/</span> <span class="number">2.0</span>);
painter<span class="operator">-</span><span class="operator">></span>scale(scale<span class="operator">,</span> scale);
painter<span class="operator">-</span><span class="operator">></span>setBrush(<span class="type"><a href="../qtgui/qbrush.html">QBrush</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black));
<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> x <span class="operator">=</span> <span class="operator">-</span>width <span class="operator">/</span> <span class="number">2.0</span>;
<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> y <span class="operator">=</span> <span class="operator">-</span>height <span class="operator">/</span> <span class="number">2.0</span> <span class="operator">-</span> remainingHeight <span class="operator">/</span> <span class="number">4.0</span> <span class="operator">+</span> spaceHeight;
foreach (<span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> items) {
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> style <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>text(<span class="number">0</span>);
<span class="type">int</span> weight <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>data(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole)<span class="operator">.</span>toInt();
bool italic <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>data(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole <span class="operator">+</span> <span class="number">1</span>)<span class="operator">.</span>toBool();
<span class="comment">// Draw each line of text.</span>
foreach (<span class="type">int</span> size<span class="operator">,</span> sampleSizes) {
<span class="type"><a href="../qtgui/qfont.html">QFont</a></span> font(family<span class="operator">,</span> size<span class="operator">,</span> weight<span class="operator">,</span> italic);
font<span class="operator">.</span>setStyleName(style);
font <span class="operator">=</span> <span class="type"><a href="../qtgui/qfont.html">QFont</a></span>(font<span class="operator">,</span> painter<span class="operator">-</span><span class="operator">></span>device());
<span class="type"><a href="../qtgui/qfontmetricsf.html">QFontMetricsF</a></span> fontMetrics(font);
<span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> rect <span class="operator">=</span> fontMetrics<span class="operator">.</span>boundingRect(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"%1 %2"</span>)<span class="operator">.</span>arg(
font<span class="operator">.</span>family())<span class="operator">.</span>arg(style));
y <span class="operator">+</span><span class="operator">=</span> rect<span class="operator">.</span>height();
painter<span class="operator">-</span><span class="operator">></span>setFont(font);
painter<span class="operator">-</span><span class="operator">></span>drawText(<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(x<span class="operator">,</span> y)<span class="operator">,</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"%1 %2"</span>)<span class="operator">.</span>arg(family)<span class="operator">.</span>arg(style));
y <span class="operator">+</span><span class="operator">=</span> interLineHeight;
}
y <span class="operator">+</span><span class="operator">=</span> spaceHeight;
}
painter<span class="operator">-</span><span class="operator">></span>restore();
<span class="preprocessor">#endif</span>
}
</pre>
</div>
<!-- @@@painting/fontsampler/mainwindow.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>
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distrib
>
Mageia
>
6
>
armv5tl
>
media
>
core-updates
>
by-pkgid
>
768f7d9f703884aa2562bf0a651086df
>
files
>
4194
