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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="small-subtitle">tools/treemodelcompleter/mainwindow.cpp</span>
<!-- $$$tools/treemodelcompleter/mainwindow.cpp-description -->
<div class="descr"> <a name="details"></a>
<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:
**
** "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 <QtGui></span>
<span class="preprocessor">#include "treemodelcompleter.h"</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)<span class="operator">,</span> completer(<span class="number">0</span>)<span class="operator">,</span> lineEdit(<span class="number">0</span>)
{
createMenu();
completer <span class="operator">=</span> <span class="keyword">new</span> TreeModelCompleter(<span class="keyword">this</span>);
completer<span class="operator">-</span><span class="operator">></span>setModel(modelFromFile(<span class="string">":/resources/treemodel.txt"</span>));
completer<span class="operator">-</span><span class="operator">></span>setSeparator(QLatin1String(<span class="string">"."</span>));
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>connect(completer<span class="operator">,</span> SIGNAL(highlighted(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(highlight(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span>)));
<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>centralWidget <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qwidget.html">QWidget</a></span>;
<span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>modelLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
modelLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Tree Model<br>(Double click items to edit)"</span>));
<span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>modeLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
modeLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Completion Mode"</span>));
modeCombo <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcombobox.html">QComboBox</a></span>;
modeCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Inline"</span>));
modeCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Filtered Popup"</span>));
modeCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Unfiltered Popup"</span>));
modeCombo<span class="operator">-</span><span class="operator">></span>setCurrentIndex(<span class="number">1</span>);
<span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>caseLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
caseLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Case Sensitivity"</span>));
caseCombo <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcombobox.html">QComboBox</a></span>;
caseCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Case Insensitive"</span>));
caseCombo<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Case Sensitive"</span>));
caseCombo<span class="operator">-</span><span class="operator">></span>setCurrentIndex(<span class="number">0</span>);
<span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>separatorLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
separatorLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Tree Separator"</span>));
<span class="type"><a href="qlineedit.html">QLineEdit</a></span> <span class="operator">*</span>separatorLineEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineedit.html">QLineEdit</a></span>;
separatorLineEdit<span class="operator">-</span><span class="operator">></span>setText(completer<span class="operator">-</span><span class="operator">></span>separator());
connect(separatorLineEdit<span class="operator">,</span> SIGNAL(textChanged(<span class="type"><a href="qstring.html">QString</a></span>))<span class="operator">,</span>
completer<span class="operator">,</span> SLOT(setSeparator(<span class="type"><a href="qstring.html">QString</a></span>)));
<span class="type"><a href="qcheckbox.html">QCheckBox</a></span> <span class="operator">*</span>wrapCheckBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcheckbox.html">QCheckBox</a></span>;
wrapCheckBox<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Wrap around completions"</span>));
wrapCheckBox<span class="operator">-</span><span class="operator">></span>setChecked(completer<span class="operator">-</span><span class="operator">></span>wrapAround());
connect(wrapCheckBox<span class="operator">,</span> SIGNAL(clicked(<span class="type">bool</span>))<span class="operator">,</span> completer<span class="operator">,</span> SLOT(setWrapAround(<span class="type">bool</span>)));
contentsLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
contentsLabel<span class="operator">-</span><span class="operator">></span>setSizePolicy(<span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Fixed<span class="operator">,</span> <span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Fixed);
connect(separatorLineEdit<span class="operator">,</span> SIGNAL(textChanged(<span class="type"><a href="qstring.html">QString</a></span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(updateContentsLabel(<span class="type"><a href="qstring.html">QString</a></span>)));
treeView <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtreeview.html">QTreeView</a></span>;
treeView<span class="operator">-</span><span class="operator">></span>setModel(completer<span class="operator">-</span><span class="operator">></span>model());
treeView<span class="operator">-</span><span class="operator">></span>header()<span class="operator">-</span><span class="operator">></span>hide();
treeView<span class="operator">-</span><span class="operator">></span>expandAll();
connect(modeCombo<span class="operator">,</span> SIGNAL(activated(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(changeMode(<span class="type">int</span>)));
connect(caseCombo<span class="operator">,</span> SIGNAL(activated(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(changeCase(<span class="type">int</span>)));
lineEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineedit.html">QLineEdit</a></span>;
lineEdit<span class="operator">-</span><span class="operator">></span>setCompleter(completer);
<span class="type"><a href="qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>;
layout<span class="operator">-</span><span class="operator">></span>addWidget(modelLabel<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>); layout<span class="operator">-</span><span class="operator">></span>addWidget(treeView<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(modeLabel<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span>); layout<span class="operator">-</span><span class="operator">></span>addWidget(modeCombo<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(caseLabel<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">0</span>); layout<span class="operator">-</span><span class="operator">></span>addWidget(caseCombo<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">1</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(separatorLabel<span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">0</span>); layout<span class="operator">-</span><span class="operator">></span>addWidget(separatorLineEdit<span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">1</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(wrapCheckBox<span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">0</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(contentsLabel<span class="operator">,</span> <span class="number">5</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span>);
layout<span class="operator">-</span><span class="operator">></span>addWidget(lineEdit<span class="operator">,</span> <span class="number">6</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span>);
centralWidget<span class="operator">-</span><span class="operator">></span>setLayout(layout);
setCentralWidget(centralWidget);
changeCase(caseCombo<span class="operator">-</span><span class="operator">></span>currentIndex());
changeMode(modeCombo<span class="operator">-</span><span class="operator">></span>currentIndex());
setWindowTitle(tr(<span class="string">"Tree Model Completer"</span>));
lineEdit<span class="operator">-</span><span class="operator">></span>setFocus();
}
<span class="type">void</span> MainWindow<span class="operator">::</span>createMenu()
{
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>exitAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"Exit"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>aboutAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"About"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>aboutQtAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"About Qt"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
connect(exitAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> qApp<span class="operator">,</span> SLOT(quit()));
connect(aboutAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(about()));
connect(aboutQtAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> qApp<span class="operator">,</span> SLOT(aboutQt()));
<span class="type"><a href="qmenu.html">QMenu</a></span><span class="operator">*</span> fileMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"File"</span>));
fileMenu<span class="operator">-</span><span class="operator">></span>addAction(exitAction);
<span class="type"><a href="qmenu.html">QMenu</a></span><span class="operator">*</span> helpMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"About"</span>));
helpMenu<span class="operator">-</span><span class="operator">></span>addAction(aboutAct);
helpMenu<span class="operator">-</span><span class="operator">></span>addAction(aboutQtAct);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>changeMode(<span class="type">int</span> index)
{
<span class="type"><a href="qcompleter.html">QCompleter</a></span><span class="operator">::</span>CompletionMode mode;
<span class="keyword">if</span> (index <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
mode <span class="operator">=</span> <span class="type"><a href="qcompleter.html">QCompleter</a></span><span class="operator">::</span>InlineCompletion;
<span class="keyword">else</span> <span class="keyword">if</span> (index <span class="operator">=</span><span class="operator">=</span> <span class="number">1</span>)
mode <span class="operator">=</span> <span class="type"><a href="qcompleter.html">QCompleter</a></span><span class="operator">::</span>PopupCompletion;
<span class="keyword">else</span>
mode <span class="operator">=</span> <span class="type"><a href="qcompleter.html">QCompleter</a></span><span class="operator">::</span>UnfilteredPopupCompletion;
completer<span class="operator">-</span><span class="operator">></span>setCompletionMode(mode);
}
<span class="type"><a href="qabstractitemmodel.html">QAbstractItemModel</a></span> <span class="operator">*</span>MainWindow<span class="operator">::</span>modelFromFile(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">&</span> fileName)
{
<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="qfile.html">QFile</a></span><span class="operator">::</span>ReadOnly))
<span class="keyword">return</span> <span class="keyword">new</span> <span class="type"><a href="qstringlistmodel.html">QStringListModel</a></span>(completer);
<span class="preprocessor">#ifndef QT_NO_CURSOR</span>
<span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>setOverrideCursor(<span class="type"><a href="qcursor.html">QCursor</a></span>(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WaitCursor));
<span class="preprocessor">#endif</span>
<span class="type"><a href="qstringlist.html">QStringList</a></span> words;
<span class="type"><a href="qstandarditemmodel.html">QStandardItemModel</a></span> <span class="operator">*</span>model <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qstandarditemmodel.html">QStandardItemModel</a></span>(completer);
<span class="type"><a href="qvector.html">QVector</a></span><span class="operator"><</span><span class="type"><a href="qstandarditem.html">QStandardItem</a></span> <span class="operator">*</span><span class="operator">></span> parents(<span class="number">10</span>);
parents<span class="operator">[</span><span class="number">0</span><span class="operator">]</span> <span class="operator">=</span> model<span class="operator">-</span><span class="operator">></span>invisibleRootItem();
<span class="keyword">while</span> (<span class="operator">!</span>file<span class="operator">.</span>atEnd()) {
<span class="type"><a href="qstring.html">QString</a></span> line <span class="operator">=</span> file<span class="operator">.</span>readLine();
<span class="type"><a href="qstring.html">QString</a></span> trimmedLine <span class="operator">=</span> line<span class="operator">.</span>trimmed();
<span class="keyword">if</span> (line<span class="operator">.</span>isEmpty() <span class="operator">|</span><span class="operator">|</span> trimmedLine<span class="operator">.</span>isEmpty())
<span class="keyword">continue</span>;
<span class="type"><a href="qregexp.html">QRegExp</a></span> re(<span class="string">"^\\s+"</span>);
<span class="type">int</span> nonws <span class="operator">=</span> re<span class="operator">.</span>indexIn(line);
<span class="type">int</span> level <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">if</span> (nonws <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) {
level <span class="operator">=</span> <span class="number">0</span>;
} <span class="keyword">else</span> {
<span class="keyword">if</span> (line<span class="operator">.</span>startsWith(<span class="string">"\t"</span>)) {
level <span class="operator">=</span> re<span class="operator">.</span>cap(<span class="number">0</span>)<span class="operator">.</span>length();
} <span class="keyword">else</span> {
level <span class="operator">=</span> re<span class="operator">.</span>cap(<span class="number">0</span>)<span class="operator">.</span>length()<span class="operator">/</span><span class="number">4</span>;
}
}
<span class="keyword">if</span> (level<span class="operator">+</span><span class="number">1</span> <span class="operator">></span><span class="operator">=</span> parents<span class="operator">.</span>size())
parents<span class="operator">.</span>resize(parents<span class="operator">.</span>size()<span class="operator">*</span><span class="number">2</span>);
<span class="type"><a href="qstandarditem.html">QStandardItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qstandarditem.html">QStandardItem</a></span>;
item<span class="operator">-</span><span class="operator">></span>setText(trimmedLine);
parents<span class="operator">[</span>level<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>appendRow(item);
parents<span class="operator">[</span>level<span class="operator">+</span><span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> item;
}
<span class="preprocessor">#ifndef QT_NO_CURSOR</span>
<span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>restoreOverrideCursor();
<span class="preprocessor">#endif</span>
<span class="keyword">return</span> model;
}
<span class="type">void</span> MainWindow<span class="operator">::</span>highlight(<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>index)
{
<span class="type"><a href="qabstractitemmodel.html">QAbstractItemModel</a></span> <span class="operator">*</span>completionModel <span class="operator">=</span> completer<span class="operator">-</span><span class="operator">></span>completionModel();
<span class="type"><a href="qabstractproxymodel.html">QAbstractProxyModel</a></span> <span class="operator">*</span>proxy <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type"><a href="qabstractproxymodel.html">QAbstractProxyModel</a></span> <span class="operator">*</span><span class="operator">></span>(completionModel);
<span class="keyword">if</span> (<span class="operator">!</span>proxy)
<span class="keyword">return</span>;
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> sourceIndex <span class="operator">=</span> proxy<span class="operator">-</span><span class="operator">></span>mapToSource(index);
treeView<span class="operator">-</span><span class="operator">></span>selectionModel()<span class="operator">-</span><span class="operator">></span>select(sourceIndex<span class="operator">,</span> <span class="type"><a href="qitemselectionmodel.html">QItemSelectionModel</a></span><span class="operator">::</span>ClearAndSelect <span class="operator">|</span> <span class="type"><a href="qitemselectionmodel.html">QItemSelectionModel</a></span><span class="operator">::</span>Rows);
treeView<span class="operator">-</span><span class="operator">></span>scrollTo(index);
}
<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"</span>)<span class="operator">,</span> tr(<span class="string">"This example demonstrates how "</span>
<span class="string">"to use a QCompleter with a custom tree model."</span>));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>changeCase(<span class="type">int</span> cs)
{
completer<span class="operator">-</span><span class="operator">></span>setCaseSensitivity(cs <span class="operator">?</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>CaseSensitive : <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>CaseInsensitive);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>updateContentsLabel(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">&</span> sep)
{
contentsLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Type path from model above with items at each level separated by a '%1'"</span>)<span class="operator">.</span>arg(sep));
}</pre>
</div>
<!-- @@@tools/treemodelcompleter/mainwindow.cpp -->
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