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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="subtitle">mainwindows/application/mainwindow.cpp</span>
<!-- $$$mainwindows/application/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">#include "mainwindow.h"</span>
MainWindow<span class="operator">::</span>MainWindow()
: textEdit(<span class="keyword">new</span> <span class="type"><a href="qplaintextedit.html">QPlainTextEdit</a></span>)
{
setCentralWidget(textEdit);
createActions();
createStatusBar();
readSettings();
connect(textEdit<span class="operator">-</span><span class="operator">></span>document()<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtgui/qtextdocument.html">QTextDocument</a></span><span class="operator">::</span>contentsChanged<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>documentWasModified);
<span class="preprocessor">#ifndef QT_NO_SESSIONMANAGER</span>
<span class="type"><a href="../qtgui/qguiapplication.html">QGuiApplication</a></span><span class="operator">::</span>setFallbackSessionManagementEnabled(<span class="keyword">false</span>);
connect(qApp<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtgui/qguiapplication.html">QGuiApplication</a></span><span class="operator">::</span>commitDataRequest<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>commitData);
<span class="preprocessor">#endif</span>
setCurrentFile(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>());
setUnifiedTitleAndToolBarOnMac(<span class="keyword">true</span>);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>closeEvent(<span class="type"><a href="../qtgui/qcloseevent.html">QCloseEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (maybeSave()) {
writeSettings();
event<span class="operator">-</span><span class="operator">></span>accept();
} <span class="keyword">else</span> {
event<span class="operator">-</span><span class="operator">></span>ignore();
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>newFile()
{
<span class="keyword">if</span> (maybeSave()) {
textEdit<span class="operator">-</span><span class="operator">></span>clear();
setCurrentFile(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>());
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>open()
{
<span class="keyword">if</span> (maybeSave()) {
<span class="type"><a href="../qtcore/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> (<span class="operator">!</span>fileName<span class="operator">.</span>isEmpty())
loadFile(fileName);
}
}
bool MainWindow<span class="operator">::</span>save()
{
<span class="keyword">if</span> (curFile<span class="operator">.</span>isEmpty()) {
<span class="keyword">return</span> saveAs();
} <span class="keyword">else</span> {
<span class="keyword">return</span> saveFile(curFile);
}
}
bool MainWindow<span class="operator">::</span>saveAs()
{
<span class="type"><a href="qfiledialog.html">QFileDialog</a></span> dialog(<span class="keyword">this</span>);
dialog<span class="operator">.</span>setWindowModality(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WindowModal);
dialog<span class="operator">.</span>setAcceptMode(<span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>AcceptSave);
<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="keyword">false</span>;
<span class="keyword">return</span> saveFile(dialog<span class="operator">.</span>selectedFiles()<span class="operator">.</span>first());
}
<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 Application"</span>)<span class="operator">,</span>
tr(<span class="string">"The <b>Application</b> example demonstrates how to "</span>
<span class="string">"write modern GUI applications using Qt, with a menu bar, "</span>
<span class="string">"toolbars, and a status bar."</span>));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>documentWasModified()
{
setWindowModified(textEdit<span class="operator">-</span><span class="operator">></span>document()<span class="operator">-</span><span class="operator">></span>isModified());
}
<span class="type">void</span> MainWindow<span class="operator">::</span>createActions()
{
<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>));
<span class="type"><a href="qtoolbar.html">QToolBar</a></span> <span class="operator">*</span>fileToolBar <span class="operator">=</span> addToolBar(tr(<span class="string">"File"</span>));
<span class="keyword">const</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span> newIcon <span class="operator">=</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>fromTheme(<span class="string">"document-new"</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span>(<span class="string">":/images/new.png"</span>));
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>newAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(newIcon<span class="operator">,</span> tr(<span class="string">"&New"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
newAct<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>New);
newAct<span class="operator">-</span><span class="operator">></span>setStatusTip(tr(<span class="string">"Create a new file"</span>));
connect(newAct<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>newFile);
fileMenu<span class="operator">-</span><span class="operator">></span>addAction(newAct);
fileToolBar<span class="operator">-</span><span class="operator">></span>addAction(newAct);
<span class="keyword">const</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span> openIcon <span class="operator">=</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>fromTheme(<span class="string">"document-open"</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span>(<span class="string">":/images/open.png"</span>));
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>openAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(openIcon<span class="operator">,</span> tr(<span class="string">"&Open..."</span>)<span class="operator">,</span> <span class="keyword">this</span>);
openAct<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Open);
openAct<span class="operator">-</span><span class="operator">></span>setStatusTip(tr(<span class="string">"Open an existing file"</span>));
connect(openAct<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>open);
fileMenu<span class="operator">-</span><span class="operator">></span>addAction(openAct);
fileToolBar<span class="operator">-</span><span class="operator">></span>addAction(openAct);
<span class="keyword">const</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span> saveIcon <span class="operator">=</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>fromTheme(<span class="string">"document-save"</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span>(<span class="string">":/images/save.png"</span>));
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>saveAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(saveIcon<span class="operator">,</span> tr(<span class="string">"&Save"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
saveAct<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Save);
saveAct<span class="operator">-</span><span class="operator">></span>setStatusTip(tr(<span class="string">"Save the document to disk"</span>));
connect(saveAct<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>save);
fileMenu<span class="operator">-</span><span class="operator">></span>addAction(saveAct);
fileToolBar<span class="operator">-</span><span class="operator">></span>addAction(saveAct);
<span class="keyword">const</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span> saveAsIcon <span class="operator">=</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>fromTheme(<span class="string">"document-save-as"</span>);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>saveAsAct <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">></span>addAction(saveAsIcon<span class="operator">,</span> tr(<span class="string">"Save &As..."</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>saveAs);
saveAsAct<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>SaveAs);
saveAsAct<span class="operator">-</span><span class="operator">></span>setStatusTip(tr(<span class="string">"Save the document under a new name"</span>));
fileMenu<span class="operator">-</span><span class="operator">></span>addSeparator();
<span class="keyword">const</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span> exitIcon <span class="operator">=</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>fromTheme(<span class="string">"application-exit"</span>);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>exitAct <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">></span>addAction(exitIcon<span class="operator">,</span> tr(<span class="string">"E&xit"</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">::</span>close);
exitAct<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Quit);
exitAct<span class="operator">-</span><span class="operator">></span>setStatusTip(tr(<span class="string">"Exit the application"</span>));
<span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>editMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(tr(<span class="string">"&Edit"</span>));
<span class="type"><a href="qtoolbar.html">QToolBar</a></span> <span class="operator">*</span>editToolBar <span class="operator">=</span> addToolBar(tr(<span class="string">"Edit"</span>));
<span class="preprocessor">#ifndef QT_NO_CLIPBOARD</span>
<span class="keyword">const</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span> cutIcon <span class="operator">=</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>fromTheme(<span class="string">"edit-cut"</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span>(<span class="string">":/images/cut.png"</span>));
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>cutAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(cutIcon<span class="operator">,</span> tr(<span class="string">"Cu&t"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
cutAct<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Cut);
cutAct<span class="operator">-</span><span class="operator">></span>setStatusTip(tr(<span class="string">"Cut the current selection's contents to the "</span>
<span class="string">"clipboard"</span>));
connect(cutAct<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> textEdit<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qplaintextedit.html">QPlainTextEdit</a></span><span class="operator">::</span>cut);
editMenu<span class="operator">-</span><span class="operator">></span>addAction(cutAct);
editToolBar<span class="operator">-</span><span class="operator">></span>addAction(cutAct);
<span class="keyword">const</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span> copyIcon <span class="operator">=</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>fromTheme(<span class="string">"edit-copy"</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span>(<span class="string">":/images/copy.png"</span>));
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>copyAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(copyIcon<span class="operator">,</span> tr(<span class="string">"&Copy"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
copyAct<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Copy);
copyAct<span class="operator">-</span><span class="operator">></span>setStatusTip(tr(<span class="string">"Copy the current selection's contents to the "</span>
<span class="string">"clipboard"</span>));
connect(copyAct<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> textEdit<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qplaintextedit.html">QPlainTextEdit</a></span><span class="operator">::</span>copy);
editMenu<span class="operator">-</span><span class="operator">></span>addAction(copyAct);
editToolBar<span class="operator">-</span><span class="operator">></span>addAction(copyAct);
<span class="keyword">const</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span> pasteIcon <span class="operator">=</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>fromTheme(<span class="string">"edit-paste"</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span>(<span class="string">":/images/paste.png"</span>));
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>pasteAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(pasteIcon<span class="operator">,</span> tr(<span class="string">"&Paste"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
pasteAct<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Paste);
pasteAct<span class="operator">-</span><span class="operator">></span>setStatusTip(tr(<span class="string">"Paste the clipboard's contents into the current "</span>
<span class="string">"selection"</span>));
connect(pasteAct<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> textEdit<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qplaintextedit.html">QPlainTextEdit</a></span><span class="operator">::</span>paste);
editMenu<span class="operator">-</span><span class="operator">></span>addAction(pasteAct);
editToolBar<span class="operator">-</span><span class="operator">></span>addAction(pasteAct);
menuBar()<span class="operator">-</span><span class="operator">></span>addSeparator();
<span class="preprocessor">#endif // !QT_NO_CLIPBOARD</span>
<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">"&Help"</span>));
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>aboutAct <span class="operator">=</span> helpMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&About"</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWindow<span class="operator">::</span>about);
aboutAct<span class="operator">-</span><span class="operator">></span>setStatusTip(tr(<span class="string">"Show the application's About box"</span>));
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>aboutQtAct <span class="operator">=</span> helpMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"About &Qt"</span>)<span class="operator">,</span> qApp<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>aboutQt);
aboutQtAct<span class="operator">-</span><span class="operator">></span>setStatusTip(tr(<span class="string">"Show the Qt library's About box"</span>));
<span class="preprocessor">#ifndef QT_NO_CLIPBOARD</span>
cutAct<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
copyAct<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
connect(textEdit<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qplaintextedit.html">QPlainTextEdit</a></span><span class="operator">::</span>copyAvailable<span class="operator">,</span> cutAct<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>setEnabled);
connect(textEdit<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qplaintextedit.html">QPlainTextEdit</a></span><span class="operator">::</span>copyAvailable<span class="operator">,</span> copyAct<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>setEnabled);
<span class="preprocessor">#endif // !QT_NO_CLIPBOARD</span>
}
<span class="type">void</span> MainWindow<span class="operator">::</span>createStatusBar()
{
statusBar()<span class="operator">-</span><span class="operator">></span>showMessage(tr(<span class="string">"Ready"</span>));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>readSettings()
{
<span class="type"><a href="../qtcore/qsettings.html">QSettings</a></span> settings(<span class="type"><a href="../qtcore/qcoreapplication.html">QCoreApplication</a></span><span class="operator">::</span>organizationName()<span class="operator">,</span> <span class="type"><a href="../qtcore/qcoreapplication.html">QCoreApplication</a></span><span class="operator">::</span>applicationName());
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> geometry <span class="operator">=</span> settings<span class="operator">.</span>value(<span class="string">"geometry"</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span>())<span class="operator">.</span>toByteArray();
<span class="keyword">if</span> (geometry<span class="operator">.</span>isEmpty()) {
<span class="keyword">const</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> availableGeometry <span class="operator">=</span> <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>desktop()<span class="operator">-</span><span class="operator">></span>availableGeometry(<span class="keyword">this</span>);
resize(availableGeometry<span class="operator">.</span>width() <span class="operator">/</span> <span class="number">3</span><span class="operator">,</span> availableGeometry<span class="operator">.</span>height() <span class="operator">/</span> <span class="number">2</span>);
move((availableGeometry<span class="operator">.</span>width() <span class="operator">-</span> width()) <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span>
(availableGeometry<span class="operator">.</span>height() <span class="operator">-</span> height()) <span class="operator">/</span> <span class="number">2</span>);
} <span class="keyword">else</span> {
restoreGeometry(geometry);
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>writeSettings()
{
<span class="type"><a href="../qtcore/qsettings.html">QSettings</a></span> settings(<span class="type"><a href="../qtcore/qcoreapplication.html">QCoreApplication</a></span><span class="operator">::</span>organizationName()<span class="operator">,</span> <span class="type"><a href="../qtcore/qcoreapplication.html">QCoreApplication</a></span><span class="operator">::</span>applicationName());
settings<span class="operator">.</span>setValue(<span class="string">"geometry"</span><span class="operator">,</span> saveGeometry());
}
bool MainWindow<span class="operator">::</span>maybeSave()
{
<span class="keyword">if</span> (<span class="operator">!</span>textEdit<span class="operator">-</span><span class="operator">></span>document()<span class="operator">-</span><span class="operator">></span>isModified())
<span class="keyword">return</span> <span class="keyword">true</span>;
<span class="keyword">const</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>StandardButton ret
<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">"Application"</span>)<span class="operator">,</span>
tr(<span class="string">"The document has been modified.\n"</span>
<span class="string">"Do you want to save your changes?"</span>)<span class="operator">,</span>
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Save <span class="operator">|</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Discard <span class="operator">|</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Cancel);
<span class="keyword">switch</span> (ret) {
<span class="keyword">case</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Save:
<span class="keyword">return</span> save();
<span class="keyword">case</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Cancel:
<span class="keyword">return</span> <span class="keyword">false</span>;
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
<span class="keyword">return</span> <span class="keyword">true</span>;
}
<span class="type">void</span> MainWindow<span class="operator">::</span>loadFile(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>fileName)
{
<span class="type"><a href="../qtcore/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="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>ReadOnly <span class="operator">|</span> <span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>Text)) {
<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">"Application"</span>)<span class="operator">,</span>
tr(<span class="string">"Cannot read file %1:\n%2."</span>)
<span class="operator">.</span>arg(<span class="type"><a href="../qtcore/qdir.html">QDir</a></span><span class="operator">::</span>toNativeSeparators(fileName)<span class="operator">,</span> file<span class="operator">.</span>errorString()));
<span class="keyword">return</span>;
}
<span class="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> in(<span class="operator">&</span>file);
<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="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WaitCursor);
<span class="preprocessor">#endif</span>
textEdit<span class="operator">-</span><span class="operator">></span>setPlainText(in<span class="operator">.</span>readAll());
<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>
setCurrentFile(fileName);
statusBar()<span class="operator">-</span><span class="operator">></span>showMessage(tr(<span class="string">"File loaded"</span>)<span class="operator">,</span> <span class="number">2000</span>);
}
bool MainWindow<span class="operator">::</span>saveFile(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>fileName)
{
<span class="type"><a href="../qtcore/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="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>WriteOnly <span class="operator">|</span> <span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>Text)) {
<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">"Application"</span>)<span class="operator">,</span>
tr(<span class="string">"Cannot write file %1:\n%2."</span>)
<span class="operator">.</span>arg(<span class="type"><a href="../qtcore/qdir.html">QDir</a></span><span class="operator">::</span>toNativeSeparators(fileName)<span class="operator">,</span>
file<span class="operator">.</span>errorString()));
<span class="keyword">return</span> <span class="keyword">false</span>;
}
<span class="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> out(<span class="operator">&</span>file);
<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="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WaitCursor);
<span class="preprocessor">#endif</span>
out <span class="operator"><</span><span class="operator"><</span> textEdit<span class="operator">-</span><span class="operator">></span>toPlainText();
<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>
setCurrentFile(fileName);
statusBar()<span class="operator">-</span><span class="operator">></span>showMessage(tr(<span class="string">"File saved"</span>)<span class="operator">,</span> <span class="number">2000</span>);
<span class="keyword">return</span> <span class="keyword">true</span>;
}
<span class="type">void</span> MainWindow<span class="operator">::</span>setCurrentFile(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>fileName)
{
curFile <span class="operator">=</span> fileName;
textEdit<span class="operator">-</span><span class="operator">></span>document()<span class="operator">-</span><span class="operator">></span>setModified(<span class="keyword">false</span>);
setWindowModified(<span class="keyword">false</span>);
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> shownName <span class="operator">=</span> curFile;
<span class="keyword">if</span> (curFile<span class="operator">.</span>isEmpty())
shownName <span class="operator">=</span> <span class="string">"untitled.txt"</span>;
setWindowFilePath(shownName);
}
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> MainWindow<span class="operator">::</span>strippedName(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>fullFileName)
{
<span class="keyword">return</span> <span class="type"><a href="../qtcore/qfileinfo.html">QFileInfo</a></span>(fullFileName)<span class="operator">.</span>fileName();
}
<span class="preprocessor">#ifndef QT_NO_SESSIONMANAGER</span>
<span class="type">void</span> MainWindow<span class="operator">::</span>commitData(<span class="type"><a href="../qtgui/qsessionmanager.html">QSessionManager</a></span> <span class="operator">&</span>manager)
{
<span class="keyword">if</span> (manager<span class="operator">.</span>allowsInteraction()) {
<span class="keyword">if</span> (<span class="operator">!</span>maybeSave())
manager<span class="operator">.</span>cancel();
} <span class="keyword">else</span> {
<span class="comment">// Non-interactive: save without asking</span>
<span class="keyword">if</span> (textEdit<span class="operator">-</span><span class="operator">></span>document()<span class="operator">-</span><span class="operator">></span>isModified())
save();
}
}
<span class="preprocessor">#endif</span>
</pre>
</div>
<!-- @@@mainwindows/application/mainwindow.cpp -->
</div>
</div>
</div>
</div>
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<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
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distrib
>
Mageia
>
6
>
armv5tl
>
media
>
core-updates
>
by-pkgid
>
768f7d9f703884aa2562bf0a651086df
>
files
>
4120
