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qt4-x11/doc/html/tools-undoframework-mainwindow-cpp.html
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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="small-subtitle">tools/undoframework/mainwindow.cpp</span>
<!-- $$$tools/undoframework/mainwindow.cpp-description -->
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<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** &quot;Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
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** * Redistributions in binary form must reproduce the above copyright
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** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
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** from this software without specific prior written permission.
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**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** 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.&quot;
**
** $QT_END_LICENSE$
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****************************************************************************/</span>
<span class="preprocessor">#include &lt;QtGui&gt;</span>
<span class="preprocessor">#include &quot;mainwindow.h&quot;</span>
<span class="preprocessor">#include &quot;diagramscene.h&quot;</span>
<span class="preprocessor">#include &quot;diagramitem.h&quot;</span>
<span class="preprocessor">#include &quot;commands.h&quot;</span>
MainWindow<span class="operator">::</span>MainWindow()
{
undoStack <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qundostack.html">QUndoStack</a></span>(<span class="keyword">this</span>);
createActions();
createMenus();
createUndoView();
diagramScene <span class="operator">=</span> <span class="keyword">new</span> DiagramScene();
<span class="type"><a href="qbrush.html">QBrush</a></span> pixmapBrush(<span class="type"><a href="qpixmap.html">QPixmap</a></span>(<span class="string">&quot;:/images/cross.png&quot;</span>)<span class="operator">.</span>scaled(<span class="number">30</span><span class="operator">,</span> <span class="number">30</span>));
diagramScene<span class="operator">-</span><span class="operator">&gt;</span>setBackgroundBrush(pixmapBrush);
diagramScene<span class="operator">-</span><span class="operator">&gt;</span>setSceneRect(<span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">500</span><span class="operator">,</span> <span class="number">500</span>));
connect(diagramScene<span class="operator">,</span> SIGNAL(itemMoved(DiagramItem<span class="operator">*</span><span class="operator">,</span><span class="type"><a href="qpointf.html">QPointF</a></span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(itemMoved(DiagramItem<span class="operator">*</span><span class="operator">,</span><span class="type"><a href="qpointf.html">QPointF</a></span>)));
setWindowTitle(<span class="string">&quot;Undo Framework&quot;</span>);
<span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span> <span class="operator">*</span>view <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span>(diagramScene);
setCentralWidget(view);
resize(<span class="number">700</span><span class="operator">,</span> <span class="number">500</span>);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>createUndoView()
{
undoView <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qundoview.html">QUndoView</a></span>(undoStack);
undoView<span class="operator">-</span><span class="operator">&gt;</span>setWindowTitle(tr(<span class="string">&quot;Command List&quot;</span>));
undoView<span class="operator">-</span><span class="operator">&gt;</span>show();
undoView<span class="operator">-</span><span class="operator">&gt;</span>setAttribute(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WA_QuitOnClose<span class="operator">,</span> <span class="keyword">false</span>);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>createActions()
{
deleteAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;Delete Item&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
deleteAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcut(tr(<span class="string">&quot;Del&quot;</span>));
connect(deleteAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(deleteItem()));
addBoxAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;Add &amp;Box&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
addBoxAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcut(tr(<span class="string">&quot;Ctrl+O&quot;</span>));
connect(addBoxAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(addBox()));
addTriangleAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;Add &amp;Triangle&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
addTriangleAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcut(tr(<span class="string">&quot;Ctrl+T&quot;</span>));
connect(addTriangleAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(addTriangle()));
undoAction <span class="operator">=</span> undoStack<span class="operator">-</span><span class="operator">&gt;</span>createUndoAction(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;&amp;Undo&quot;</span>));
undoAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Undo);
redoAction <span class="operator">=</span> undoStack<span class="operator">-</span><span class="operator">&gt;</span>createRedoAction(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;&amp;Redo&quot;</span>));
redoAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Redo);
exitAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;E&amp;xit&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
exitAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Quit);
connect(exitAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(close()));
aboutAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;&amp;About&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
<span class="type"><a href="qlist.html">QList</a></span><span class="operator">&lt;</span><span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">&gt;</span> aboutShortcuts;
aboutShortcuts <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Ctrl+A&quot;</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Ctrl+B&quot;</span>);
aboutAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(aboutShortcuts);
connect(aboutAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(about()));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>createMenus()
{
fileMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;File&quot;</span>));
fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(exitAction);
editMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;Edit&quot;</span>));
editMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(undoAction);
editMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(redoAction);
editMenu<span class="operator">-</span><span class="operator">&gt;</span>addSeparator();
editMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(deleteAction);
connect(editMenu<span class="operator">,</span> SIGNAL(aboutToShow())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(itemMenuAboutToShow()));
connect(editMenu<span class="operator">,</span> SIGNAL(aboutToHide())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(itemMenuAboutToHide()));
itemMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;Item&quot;</span>));
itemMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(addBoxAction);
itemMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(addTriangleAction);
helpMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;About&quot;</span>));
helpMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(aboutAction);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>itemMoved(DiagramItem <span class="operator">*</span>movedItem<span class="operator">,</span>
<span class="keyword">const</span> <span class="type"><a href="qpointf.html">QPointF</a></span> <span class="operator">&amp;</span>oldPosition)
{
undoStack<span class="operator">-</span><span class="operator">&gt;</span>push(<span class="keyword">new</span> MoveCommand(movedItem<span class="operator">,</span> oldPosition));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>deleteItem()
{
<span class="keyword">if</span> (diagramScene<span class="operator">-</span><span class="operator">&gt;</span>selectedItems()<span class="operator">.</span>isEmpty())
<span class="keyword">return</span>;
<span class="type"><a href="qundocommand.html">QUndoCommand</a></span> <span class="operator">*</span>deleteCommand <span class="operator">=</span> <span class="keyword">new</span> DeleteCommand(diagramScene);
undoStack<span class="operator">-</span><span class="operator">&gt;</span>push(deleteCommand);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>itemMenuAboutToHide()
{
deleteAction<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">true</span>);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>itemMenuAboutToShow()
{
deleteAction<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="operator">!</span>diagramScene<span class="operator">-</span><span class="operator">&gt;</span>selectedItems()<span class="operator">.</span>isEmpty());
}
<span class="type">void</span> MainWindow<span class="operator">::</span>addBox()
{
<span class="type"><a href="qundocommand.html">QUndoCommand</a></span> <span class="operator">*</span>addCommand <span class="operator">=</span> <span class="keyword">new</span> AddCommand(DiagramItem<span class="operator">::</span>Box<span class="operator">,</span> diagramScene);
undoStack<span class="operator">-</span><span class="operator">&gt;</span>push(addCommand);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>addTriangle()
{
<span class="type"><a href="qundocommand.html">QUndoCommand</a></span> <span class="operator">*</span>addCommand <span class="operator">=</span> <span class="keyword">new</span> AddCommand(DiagramItem<span class="operator">::</span>Triangle<span class="operator">,</span>
diagramScene);
undoStack<span class="operator">-</span><span class="operator">&gt;</span>push(addCommand);
}
<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">&quot;About Undo&quot;</span>)<span class="operator">,</span>
tr(<span class="string">&quot;The &lt;b&gt;Undo&lt;/b&gt; example demonstrates how to &quot;</span>
<span class="string">&quot;use Qt's undo framework.&quot;</span>));
}</pre>
</div>
<!-- @@@tools/undoframework/mainwindow.cpp -->
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