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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="small-subtitle">demos/undo/mainwindow.cpp</span>
<!-- $$$demos/undo/mainwindow.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include <QUndoGroup></span>
<span class="preprocessor">#include <QUndoStack></span>
<span class="preprocessor">#include <QFileDialog></span>
<span class="preprocessor">#include <QMessageBox></span>
<span class="preprocessor">#include <QTextStream></span>
<span class="preprocessor">#include <QToolButton></span>
<span class="preprocessor">#include "document.h"</span>
<span class="preprocessor">#include "mainwindow.h"</span>
<span class="preprocessor">#include "commands.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>);
<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>w <span class="operator">=</span> documentTabs<span class="operator">-</span><span class="operator">></span>widget(<span class="number">0</span>);
documentTabs<span class="operator">-</span><span class="operator">></span>removeTab(<span class="number">0</span>);
<span class="keyword">delete</span> w;
connect(actionOpen<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(openDocument()));
connect(actionClose<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(closeDocument()));
connect(actionNew<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(newDocument()));
connect(actionSave<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(saveDocument()));
connect(actionExit<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(close()));
connect(actionRed<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(setShapeColor()));
connect(actionGreen<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(setShapeColor()));
connect(actionBlue<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(setShapeColor()));
connect(actionAddCircle<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(addShape()));
connect(actionAddRectangle<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(addShape()));
connect(actionAddTriangle<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(addShape()));
connect(actionRemoveShape<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(removeShape()));
connect(actionAddRobot<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(addRobot()));
connect(actionAddSnowman<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(addSnowman()));
connect(actionAbout<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(about()));
connect(actionAboutQt<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(aboutQt()));
connect(undoLimit<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateActions()));
connect(documentTabs<span class="operator">,</span> SIGNAL(currentChanged(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateActions()));
actionOpen<span class="operator">-</span><span class="operator">></span>setShortcut(<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"Ctrl+O"</span>));
actionClose<span class="operator">-</span><span class="operator">></span>setShortcut(<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"Ctrl+W"</span>));
actionNew<span class="operator">-</span><span class="operator">></span>setShortcut(<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"Ctrl+N"</span>));
actionSave<span class="operator">-</span><span class="operator">></span>setShortcut(<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"Ctrl+S"</span>));
actionExit<span class="operator">-</span><span class="operator">></span>setShortcut(<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"Ctrl+Q"</span>));
actionRemoveShape<span class="operator">-</span><span class="operator">></span>setShortcut(<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"Del"</span>));
actionRed<span class="operator">-</span><span class="operator">></span>setShortcut(<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"Alt+R"</span>));
actionGreen<span class="operator">-</span><span class="operator">></span>setShortcut(<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"Alt+G"</span>));
actionBlue<span class="operator">-</span><span class="operator">></span>setShortcut(<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"Alt+B"</span>));
actionAddCircle<span class="operator">-</span><span class="operator">></span>setShortcut(<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"Alt+C"</span>));
actionAddRectangle<span class="operator">-</span><span class="operator">></span>setShortcut(<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"Alt+L"</span>));
actionAddTriangle<span class="operator">-</span><span class="operator">></span>setShortcut(<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"Alt+T"</span>));
m_undoGroup <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qundogroup.html">QUndoGroup</a></span>(<span class="keyword">this</span>);
undoView<span class="operator">-</span><span class="operator">></span>setGroup(m_undoGroup);
undoView<span class="operator">-</span><span class="operator">></span>setCleanIcon(<span class="type"><a href="qicon.html">QIcon</a></span>(<span class="string">":/icons/ok.png"</span>));
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>undoAction <span class="operator">=</span> m_undoGroup<span class="operator">-</span><span class="operator">></span>createUndoAction(<span class="keyword">this</span>);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>redoAction <span class="operator">=</span> m_undoGroup<span class="operator">-</span><span class="operator">></span>createRedoAction(<span class="keyword">this</span>);
undoAction<span class="operator">-</span><span class="operator">></span>setIcon(<span class="type"><a href="qicon.html">QIcon</a></span>(<span class="string">":/icons/undo.png"</span>));
redoAction<span class="operator">-</span><span class="operator">></span>setIcon(<span class="type"><a href="qicon.html">QIcon</a></span>(<span class="string">":/icons/redo.png"</span>));
menuShape<span class="operator">-</span><span class="operator">></span>insertAction(menuShape<span class="operator">-</span><span class="operator">></span>actions()<span class="operator">.</span>at(<span class="number">0</span>)<span class="operator">,</span> undoAction);
menuShape<span class="operator">-</span><span class="operator">></span>insertAction(undoAction<span class="operator">,</span> redoAction);
toolBar<span class="operator">-</span><span class="operator">></span>addAction(undoAction);
toolBar<span class="operator">-</span><span class="operator">></span>addAction(redoAction);
newDocument();
updateActions();
};
<span class="type">void</span> MainWindow<span class="operator">::</span>updateActions()
{
Document <span class="operator">*</span>doc <span class="operator">=</span> currentDocument();
m_undoGroup<span class="operator">-</span><span class="operator">></span>setActiveStack(doc <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">?</span> <span class="number">0</span> : doc<span class="operator">-</span><span class="operator">></span>undoStack());
<span class="type"><a href="qstring.html">QString</a></span> shapeName <span class="operator">=</span> doc <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">?</span> <span class="type"><a href="qstring.html">QString</a></span>() : doc<span class="operator">-</span><span class="operator">></span>currentShapeName();
actionAddRobot<span class="operator">-</span><span class="operator">></span>setEnabled(doc <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>);
actionAddSnowman<span class="operator">-</span><span class="operator">></span>setEnabled(doc <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>);
actionAddCircle<span class="operator">-</span><span class="operator">></span>setEnabled(doc <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>);
actionAddRectangle<span class="operator">-</span><span class="operator">></span>setEnabled(doc <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>);
actionAddTriangle<span class="operator">-</span><span class="operator">></span>setEnabled(doc <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>);
actionClose<span class="operator">-</span><span class="operator">></span>setEnabled(doc <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>);
actionSave<span class="operator">-</span><span class="operator">></span>setEnabled(doc <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> <span class="operator">!</span>doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">-</span><span class="operator">></span>isClean());
undoLimit<span class="operator">-</span><span class="operator">></span>setEnabled(doc <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">-</span><span class="operator">></span>count() <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>);
<span class="keyword">if</span> (shapeName<span class="operator">.</span>isEmpty()) {
actionRed<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
actionGreen<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
actionBlue<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
actionRemoveShape<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
} <span class="keyword">else</span> {
Shape shape <span class="operator">=</span> doc<span class="operator">-</span><span class="operator">></span>shape(shapeName);
actionRed<span class="operator">-</span><span class="operator">></span>setEnabled(shape<span class="operator">.</span>color() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>red);
actionGreen<span class="operator">-</span><span class="operator">></span>setEnabled(shape<span class="operator">.</span>color() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>green);
actionBlue<span class="operator">-</span><span class="operator">></span>setEnabled(shape<span class="operator">.</span>color() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>blue);
actionRemoveShape<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
}
<span class="keyword">if</span> (doc <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>) {
<span class="type">int</span> index <span class="operator">=</span> documentTabs<span class="operator">-</span><span class="operator">></span>indexOf(doc);
Q_ASSERT(index <span class="operator">!</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>);
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type"><a href="qicon.html">QIcon</a></span> unsavedIcon(<span class="string">":/icons/filesave.png"</span>);
documentTabs<span class="operator">-</span><span class="operator">></span>setTabIcon(index<span class="operator">,</span> doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">-</span><span class="operator">></span>isClean() <span class="operator">?</span> <span class="type"><a href="qicon.html">QIcon</a></span>() : unsavedIcon);
<span class="keyword">if</span> (doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">-</span><span class="operator">></span>count() <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">-</span><span class="operator">></span>setUndoLimit(undoLimit<span class="operator">-</span><span class="operator">></span>value());
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>openDocument()
{
<span class="type"><a href="qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getOpenFileName(<span class="keyword">this</span>);
<span class="keyword">if</span> (fileName<span class="operator">.</span>isEmpty())
<span class="keyword">return</span>;
<span class="type"><a href="qfile.html">QFile</a></span> file(fileName);
<span class="keyword">if</span> (<span class="operator">!</span>file<span class="operator">.</span>open(<span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly)) {
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span>
tr(<span class="string">"File error"</span>)<span class="operator">,</span>
tr(<span class="string">"Failed to open\n%1"</span>)<span class="operator">.</span>arg(fileName));
<span class="keyword">return</span>;
}
<span class="type"><a href="qtextstream.html">QTextStream</a></span> stream(<span class="operator">&</span>file);
Document <span class="operator">*</span>doc <span class="operator">=</span> <span class="keyword">new</span> Document();
<span class="keyword">if</span> (<span class="operator">!</span>doc<span class="operator">-</span><span class="operator">></span>load(stream)) {
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span>
tr(<span class="string">"Parse error"</span>)<span class="operator">,</span>
tr(<span class="string">"Failed to parse\n%1"</span>)<span class="operator">.</span>arg(fileName));
<span class="keyword">delete</span> doc;
<span class="keyword">return</span>;
}
doc<span class="operator">-</span><span class="operator">></span>setFileName(fileName);
addDocument(doc);
}
<span class="type"><a href="qstring.html">QString</a></span> MainWindow<span class="operator">::</span>fixedWindowTitle(<span class="keyword">const</span> Document <span class="operator">*</span>doc) <span class="keyword">const</span>
{
<span class="type"><a href="qstring.html">QString</a></span> title <span class="operator">=</span> doc<span class="operator">-</span><span class="operator">></span>fileName();
<span class="keyword">if</span> (title<span class="operator">.</span>isEmpty())
title <span class="operator">=</span> tr(<span class="string">"Unnamed"</span>);
<span class="keyword">else</span>
title <span class="operator">=</span> <span class="type"><a href="qfileinfo.html">QFileInfo</a></span>(title)<span class="operator">.</span>fileName();
<span class="type"><a href="qstring.html">QString</a></span> result;
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; ; <span class="operator">+</span><span class="operator">+</span>i) {
result <span class="operator">=</span> title;
<span class="keyword">if</span> (i <span class="operator">></span> <span class="number">0</span>)
result <span class="operator">+</span><span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>number(i);
<span class="type">bool</span> unique <span class="operator">=</span> <span class="keyword">true</span>;
<span class="keyword">for</span> (<span class="type">int</span> j <span class="operator">=</span> <span class="number">0</span>; j <span class="operator"><</span> documentTabs<span class="operator">-</span><span class="operator">></span>count(); <span class="operator">+</span><span class="operator">+</span>j) {
<span class="keyword">const</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>widget <span class="operator">=</span> documentTabs<span class="operator">-</span><span class="operator">></span>widget(j);
<span class="keyword">if</span> (widget <span class="operator">=</span><span class="operator">=</span> doc)
<span class="keyword">continue</span>;
<span class="keyword">if</span> (result <span class="operator">=</span><span class="operator">=</span> documentTabs<span class="operator">-</span><span class="operator">></span>tabText(j)) {
unique <span class="operator">=</span> <span class="keyword">false</span>;
<span class="keyword">break</span>;
}
}
<span class="keyword">if</span> (unique)
<span class="keyword">break</span>;
}
<span class="keyword">return</span> result;
}
<span class="type">void</span> MainWindow<span class="operator">::</span>addDocument(Document <span class="operator">*</span>doc)
{
<span class="keyword">if</span> (documentTabs<span class="operator">-</span><span class="operator">></span>indexOf(doc) <span class="operator">!</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>)
<span class="keyword">return</span>;
m_undoGroup<span class="operator">-</span><span class="operator">></span>addStack(doc<span class="operator">-</span><span class="operator">></span>undoStack());
documentTabs<span class="operator">-</span><span class="operator">></span>addTab(doc<span class="operator">,</span> fixedWindowTitle(doc));
connect(doc<span class="operator">,</span> SIGNAL(currentShapeChanged(<span class="type"><a href="qstring.html">QString</a></span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateActions()));
connect(doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">,</span> SIGNAL(indexChanged(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateActions()));
connect(doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">,</span> SIGNAL(cleanChanged(<span class="type">bool</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateActions()));
setCurrentDocument(doc);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>setCurrentDocument(Document <span class="operator">*</span>doc)
{
documentTabs<span class="operator">-</span><span class="operator">></span>setCurrentWidget(doc);
}
Document <span class="operator">*</span>MainWindow<span class="operator">::</span>currentDocument() <span class="keyword">const</span>
{
<span class="keyword">return</span> qobject_cast<span class="operator"><</span>Document<span class="operator">*</span><span class="operator">></span>(documentTabs<span class="operator">-</span><span class="operator">></span>currentWidget());
}
<span class="type">void</span> MainWindow<span class="operator">::</span>removeDocument(Document <span class="operator">*</span>doc)
{
<span class="type">int</span> index <span class="operator">=</span> documentTabs<span class="operator">-</span><span class="operator">></span>indexOf(doc);
<span class="keyword">if</span> (index <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>)
<span class="keyword">return</span>;
documentTabs<span class="operator">-</span><span class="operator">></span>removeTab(index);
m_undoGroup<span class="operator">-</span><span class="operator">></span>removeStack(doc<span class="operator">-</span><span class="operator">></span>undoStack());
disconnect(doc<span class="operator">,</span> SIGNAL(currentShapeChanged(<span class="type"><a href="qstring.html">QString</a></span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateActions()));
disconnect(doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">,</span> SIGNAL(indexChanged(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateActions()));
disconnect(doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">,</span> SIGNAL(cleanChanged(<span class="type">bool</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateActions()));
<span class="keyword">if</span> (documentTabs<span class="operator">-</span><span class="operator">></span>count() <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) {
newDocument();
updateActions();
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>saveDocument()
{
Document <span class="operator">*</span>doc <span class="operator">=</span> currentDocument();
<span class="keyword">if</span> (doc <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span>;
<span class="keyword">for</span> (;;) {
<span class="type"><a href="qstring.html">QString</a></span> fileName <span class="operator">=</span> doc<span class="operator">-</span><span class="operator">></span>fileName();
<span class="keyword">if</span> (fileName<span class="operator">.</span>isEmpty())
fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getSaveFileName(<span class="keyword">this</span>);
<span class="keyword">if</span> (fileName<span class="operator">.</span>isEmpty())
<span class="keyword">break</span>;
<span class="type"><a href="qfile.html">QFile</a></span> file(fileName);
<span class="keyword">if</span> (<span class="operator">!</span>file<span class="operator">.</span>open(<span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>WriteOnly)) {
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span>
tr(<span class="string">"File error"</span>)<span class="operator">,</span>
tr(<span class="string">"Failed to open\n%1"</span>)<span class="operator">.</span>arg(fileName));
doc<span class="operator">-</span><span class="operator">></span>setFileName(<span class="type"><a href="qstring.html">QString</a></span>());
} <span class="keyword">else</span> {
<span class="type"><a href="qtextstream.html">QTextStream</a></span> stream(<span class="operator">&</span>file);
doc<span class="operator">-</span><span class="operator">></span>save(stream);
doc<span class="operator">-</span><span class="operator">></span>setFileName(fileName);
<span class="type">int</span> index <span class="operator">=</span> documentTabs<span class="operator">-</span><span class="operator">></span>indexOf(doc);
Q_ASSERT(index <span class="operator">!</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>);
documentTabs<span class="operator">-</span><span class="operator">></span>setTabText(index<span class="operator">,</span> fixedWindowTitle(doc));
<span class="keyword">break</span>;
}
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>closeDocument()
{
Document <span class="operator">*</span>doc <span class="operator">=</span> currentDocument();
<span class="keyword">if</span> (doc <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span>;
<span class="keyword">if</span> (<span class="operator">!</span>doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">-</span><span class="operator">></span>isClean()) {
<span class="type">int</span> button
<span class="operator">=</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span>
tr(<span class="string">"Unsaved changes"</span>)<span class="operator">,</span>
tr(<span class="string">"Would you like to save this document?"</span>)<span class="operator">,</span>
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Yes<span class="operator">,</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>No);
<span class="keyword">if</span> (button <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Yes)
saveDocument();
}
removeDocument(doc);
<span class="keyword">delete</span> doc;
}
<span class="type">void</span> MainWindow<span class="operator">::</span>newDocument()
{
addDocument(<span class="keyword">new</span> Document());
}
<span class="keyword">static</span> <span class="type"><a href="qcolor.html">QColor</a></span> randomColor()
{
<span class="type">int</span> r <span class="operator">=</span> (<span class="type">int</span>) (<span class="number">3.0</span><span class="operator">*</span>(rand()<span class="operator">/</span>(RAND_MAX <span class="operator">+</span> <span class="number">1.0</span>)));
<span class="keyword">switch</span> (r) {
<span class="keyword">case</span> <span class="number">0</span>:
<span class="keyword">return</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>red;
<span class="keyword">case</span> <span class="number">1</span>:
<span class="keyword">return</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>green;
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
<span class="keyword">return</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>blue;
}
<span class="keyword">static</span> <span class="type"><a href="qrect.html">QRect</a></span> randomRect(<span class="keyword">const</span> <span class="type"><a href="qsize.html">QSize</a></span> <span class="operator">&</span>s)
{
<span class="type"><a href="qsize.html">QSize</a></span> min <span class="operator">=</span> Shape<span class="operator">::</span>minSize;
<span class="type">int</span> left <span class="operator">=</span> (<span class="type">int</span>) ((<span class="number">0.0</span> <span class="operator">+</span> s<span class="operator">.</span>width() <span class="operator">-</span> min<span class="operator">.</span>width())<span class="operator">*</span>(rand()<span class="operator">/</span>(RAND_MAX <span class="operator">+</span> <span class="number">1.0</span>)));
<span class="type">int</span> top <span class="operator">=</span> (<span class="type">int</span>) ((<span class="number">0.0</span> <span class="operator">+</span> s<span class="operator">.</span>height() <span class="operator">-</span> min<span class="operator">.</span>height())<span class="operator">*</span>(rand()<span class="operator">/</span>(RAND_MAX <span class="operator">+</span> <span class="number">1.0</span>)));
<span class="type">int</span> width <span class="operator">=</span> (<span class="type">int</span>) ((<span class="number">0.0</span> <span class="operator">+</span> s<span class="operator">.</span>width() <span class="operator">-</span> left <span class="operator">-</span> min<span class="operator">.</span>width())<span class="operator">*</span>(rand()<span class="operator">/</span>(RAND_MAX <span class="operator">+</span> <span class="number">1.0</span>))) <span class="operator">+</span> min<span class="operator">.</span>width();
<span class="type">int</span> height <span class="operator">=</span> (<span class="type">int</span>) ((<span class="number">0.0</span> <span class="operator">+</span> s<span class="operator">.</span>height() <span class="operator">-</span> top <span class="operator">-</span> min<span class="operator">.</span>height())<span class="operator">*</span>(rand()<span class="operator">/</span>(RAND_MAX <span class="operator">+</span> <span class="number">1.0</span>))) <span class="operator">+</span> min<span class="operator">.</span>height();
<span class="keyword">return</span> <span class="type"><a href="qrect.html">QRect</a></span>(left<span class="operator">,</span> top<span class="operator">,</span> width<span class="operator">,</span> height);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>addShape()
{
Document <span class="operator">*</span>doc <span class="operator">=</span> currentDocument();
<span class="keyword">if</span> (doc <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span>;
Shape<span class="operator">::</span>Type type;
<span class="keyword">if</span> (sender() <span class="operator">=</span><span class="operator">=</span> actionAddCircle)
type <span class="operator">=</span> Shape<span class="operator">::</span>Circle;
<span class="keyword">else</span> <span class="keyword">if</span> (sender() <span class="operator">=</span><span class="operator">=</span> actionAddRectangle)
type <span class="operator">=</span> Shape<span class="operator">::</span>Rectangle;
<span class="keyword">else</span> <span class="keyword">if</span> (sender() <span class="operator">=</span><span class="operator">=</span> actionAddTriangle)
type <span class="operator">=</span> Shape<span class="operator">::</span>Triangle;
<span class="keyword">else</span> <span class="keyword">return</span>;
Shape newShape(type<span class="operator">,</span> randomColor()<span class="operator">,</span> randomRect(doc<span class="operator">-</span><span class="operator">></span>size()));
doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">-</span><span class="operator">></span>push(<span class="keyword">new</span> AddShapeCommand(doc<span class="operator">,</span> newShape));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>removeShape()
{
Document <span class="operator">*</span>doc <span class="operator">=</span> currentDocument();
<span class="keyword">if</span> (doc <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span>;
<span class="type"><a href="qstring.html">QString</a></span> shapeName <span class="operator">=</span> doc<span class="operator">-</span><span class="operator">></span>currentShapeName();
<span class="keyword">if</span> (shapeName<span class="operator">.</span>isEmpty())
<span class="keyword">return</span>;
doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">-</span><span class="operator">></span>push(<span class="keyword">new</span> RemoveShapeCommand(doc<span class="operator">,</span> shapeName));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>setShapeColor()
{
Document <span class="operator">*</span>doc <span class="operator">=</span> currentDocument();
<span class="keyword">if</span> (doc <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span>;
<span class="type"><a href="qstring.html">QString</a></span> shapeName <span class="operator">=</span> doc<span class="operator">-</span><span class="operator">></span>currentShapeName();
<span class="keyword">if</span> (shapeName<span class="operator">.</span>isEmpty())
<span class="keyword">return</span>;
<span class="type"><a href="qcolor.html">QColor</a></span> color;
<span class="keyword">if</span> (sender() <span class="operator">=</span><span class="operator">=</span> actionRed)
color <span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>red;
<span class="keyword">else</span> <span class="keyword">if</span> (sender() <span class="operator">=</span><span class="operator">=</span> actionGreen)
color <span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>green;
<span class="keyword">else</span> <span class="keyword">if</span> (sender() <span class="operator">=</span><span class="operator">=</span> actionBlue)
color <span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>blue;
<span class="keyword">else</span>
<span class="keyword">return</span>;
<span class="keyword">if</span> (color <span class="operator">=</span><span class="operator">=</span> doc<span class="operator">-</span><span class="operator">></span>shape(shapeName)<span class="operator">.</span>color())
<span class="keyword">return</span>;
doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">-</span><span class="operator">></span>push(<span class="keyword">new</span> SetShapeColorCommand(doc<span class="operator">,</span> shapeName<span class="operator">,</span> color));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>addSnowman()
{
Document <span class="operator">*</span>doc <span class="operator">=</span> currentDocument();
<span class="keyword">if</span> (doc <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span>;
<span class="comment">// Create a macro command using beginMacro() and endMacro()</span>
doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">-</span><span class="operator">></span>beginMacro(tr(<span class="string">"Add snowman"</span>));
doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">-</span><span class="operator">></span>push(<span class="keyword">new</span> AddShapeCommand(doc<span class="operator">,</span>
Shape(Shape<span class="operator">::</span>Circle<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>blue<span class="operator">,</span> <span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">51</span><span class="operator">,</span> <span class="number">30</span><span class="operator">,</span> <span class="number">97</span><span class="operator">,</span> <span class="number">95</span>))));
doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">-</span><span class="operator">></span>push(<span class="keyword">new</span> AddShapeCommand(doc<span class="operator">,</span>
Shape(Shape<span class="operator">::</span>Circle<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>blue<span class="operator">,</span> <span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">27</span><span class="operator">,</span> <span class="number">123</span><span class="operator">,</span> <span class="number">150</span><span class="operator">,</span> <span class="number">133</span>))));
doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">-</span><span class="operator">></span>push(<span class="keyword">new</span> AddShapeCommand(doc<span class="operator">,</span>
Shape(Shape<span class="operator">::</span>Circle<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>blue<span class="operator">,</span> <span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">11</span><span class="operator">,</span> <span class="number">253</span><span class="operator">,</span> <span class="number">188</span><span class="operator">,</span> <span class="number">146</span>))));
doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">-</span><span class="operator">></span>endMacro();
}
<span class="type">void</span> MainWindow<span class="operator">::</span>addRobot()
{
Document <span class="operator">*</span>doc <span class="operator">=</span> currentDocument();
<span class="keyword">if</span> (doc <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span>;
<span class="comment">// Compose a macro command by explicitly adding children to a parent command</span>
<span class="type"><a href="qundocommand.html">QUndoCommand</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qundocommand.html">QUndoCommand</a></span>(tr(<span class="string">"Add robot"</span>));
<span class="keyword">new</span> AddShapeCommand(doc<span class="operator">,</span> Shape(Shape<span class="operator">::</span>Rectangle<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>green<span class="operator">,</span> <span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">115</span><span class="operator">,</span> <span class="number">15</span><span class="operator">,</span> <span class="number">81</span><span class="operator">,</span> <span class="number">70</span>))<span class="operator">,</span> parent);
<span class="keyword">new</span> AddShapeCommand(doc<span class="operator">,</span> Shape(Shape<span class="operator">::</span>Rectangle<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>green<span class="operator">,</span> <span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">82</span><span class="operator">,</span> <span class="number">89</span><span class="operator">,</span> <span class="number">148</span><span class="operator">,</span> <span class="number">188</span>))<span class="operator">,</span> parent);
<span class="keyword">new</span> AddShapeCommand(doc<span class="operator">,</span> Shape(Shape<span class="operator">::</span>Rectangle<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>green<span class="operator">,</span> <span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">76</span><span class="operator">,</span> <span class="number">280</span><span class="operator">,</span> <span class="number">80</span><span class="operator">,</span> <span class="number">165</span>))<span class="operator">,</span> parent);
<span class="keyword">new</span> AddShapeCommand(doc<span class="operator">,</span> Shape(Shape<span class="operator">::</span>Rectangle<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>green<span class="operator">,</span> <span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">163</span><span class="operator">,</span> <span class="number">280</span><span class="operator">,</span> <span class="number">80</span><span class="operator">,</span> <span class="number">164</span>))<span class="operator">,</span> parent);
<span class="keyword">new</span> AddShapeCommand(doc<span class="operator">,</span> Shape(Shape<span class="operator">::</span>Circle<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>blue<span class="operator">,</span> <span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">116</span><span class="operator">,</span> <span class="number">25</span><span class="operator">,</span> <span class="number">80</span><span class="operator">,</span> <span class="number">50</span>))<span class="operator">,</span> parent);
<span class="keyword">new</span> AddShapeCommand(doc<span class="operator">,</span> Shape(Shape<span class="operator">::</span>Rectangle<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>green<span class="operator">,</span> <span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">232</span><span class="operator">,</span> <span class="number">92</span><span class="operator">,</span> <span class="number">80</span><span class="operator">,</span> <span class="number">127</span>))<span class="operator">,</span> parent);
<span class="keyword">new</span> AddShapeCommand(doc<span class="operator">,</span> Shape(Shape<span class="operator">::</span>Rectangle<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>green<span class="operator">,</span> <span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">2</span><span class="operator">,</span> <span class="number">92</span><span class="operator">,</span> <span class="number">80</span><span class="operator">,</span> <span class="number">125</span>))<span class="operator">,</span> parent);
doc<span class="operator">-</span><span class="operator">></span>undoStack()<span class="operator">-</span><span class="operator">></span>push(parent);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>about()
{
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>about(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"About Undo"</span>)<span class="operator">,</span> tr(<span class="string">"The Undo demonstration shows how to use the Qt Undo framework."</span>));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>aboutQt()
{
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>aboutQt(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"About Qt"</span>));
}</pre>
</div>
<!-- @@@demos/undo/mainwindow.cpp -->
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