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mainwindow.cpp Example File
^{tools/settingseditor/mainwindow.cpp}

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 #include <QtGui>

 #include "locationdialog.h"
 #include "mainwindow.h"
 #include "settingstree.h"

 MainWindow::MainWindow()
 {
     settingsTree = new SettingsTree;
     setCentralWidget(settingsTree);

     locationDialog = 0;

     createActions();
     createMenus();

     autoRefreshAct->setChecked(true);
     fallbacksAct->setChecked(true);

     setWindowTitle(tr("Settings Editor"));
     resize(500, 600);
 }

 void MainWindow::openSettings()
 {
     if (!locationDialog)
         locationDialog = new LocationDialog(this);

     if (locationDialog->exec()) {
         QSettings *settings = new QSettings(locationDialog->format(),
                                             locationDialog->scope(),
                                             locationDialog->organization(),
                                             locationDialog->application());
         setSettingsObject(settings);
         fallbacksAct->setEnabled(true);
     }
 }

 void MainWindow::openIniFile()
 {
     QString fileName = QFileDialog::getOpenFileName(this, tr("Open INI File"),
                                "", tr("INI Files (*.ini *.conf)"));
     if (!fileName.isEmpty()) {
         QSettings *settings = new QSettings(fileName, QSettings::IniFormat);
         setSettingsObject(settings);
         fallbacksAct->setEnabled(false);
     }
 }

 void MainWindow::openPropertyList()
 {
     QString fileName = QFileDialog::getOpenFileName(this,
                                tr("Open Property List"),
                                "", tr("Property List Files (*.plist)"));
     if (!fileName.isEmpty()) {
         QSettings *settings = new QSettings(fileName, QSettings::NativeFormat);
         setSettingsObject(settings);
         fallbacksAct->setEnabled(false);
     }
 }

 void MainWindow::openRegistryPath()
 {
     QString path = QInputDialog::getText(this, tr("Open Registry Path"),
                            tr("Enter the path in the Windows registry:"),
                            QLineEdit::Normal, "HKEY_CURRENT_USER\\");
     if (!path.isEmpty()) {
         QSettings *settings = new QSettings(path, QSettings::NativeFormat);
         setSettingsObject(settings);
         fallbacksAct->setEnabled(false);
     }
 }

 void MainWindow::about()
 {
     QMessageBox::about(this, tr("About Settings Editor"),
             tr("The <b>Settings Editor</b> example shows how to access "
                "application settings using Qt."));
 }

 void MainWindow::createActions()
 {
     openSettingsAct = new QAction(tr("&Open Application Settings..."), this);
     openSettingsAct->setShortcut(tr("Ctrl+O"));
     connect(openSettingsAct, SIGNAL(triggered()), this, SLOT(openSettings()));

     openIniFileAct = new QAction(tr("Open I&NI File..."), this);
     openIniFileAct->setShortcut(tr("Ctrl+N"));
     connect(openIniFileAct, SIGNAL(triggered()), this, SLOT(openIniFile()));

     openPropertyListAct = new QAction(tr("Open Mac &Property List..."), this);
     openPropertyListAct->setShortcut(tr("Ctrl+P"));
     connect(openPropertyListAct, SIGNAL(triggered()),
             this, SLOT(openPropertyList()));

     openRegistryPathAct = new QAction(tr("Open Windows &Registry Path..."),
                                       this);
     openRegistryPathAct->setShortcut(tr("Ctrl+G"));
     connect(openRegistryPathAct, SIGNAL(triggered()),
             this, SLOT(openRegistryPath()));

     refreshAct = new QAction(tr("&Refresh"), this);
     refreshAct->setShortcut(tr("Ctrl+R"));
     refreshAct->setEnabled(false);
     connect(refreshAct, SIGNAL(triggered()), settingsTree, SLOT(refresh()));

     exitAct = new QAction(tr("E&xit"), this);
     exitAct->setShortcut(tr("Ctrl+Q"));
     connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

     autoRefreshAct = new QAction(tr("&Auto-Refresh"), this);
     autoRefreshAct->setShortcut(tr("Ctrl+A"));
     autoRefreshAct->setCheckable(true);
     autoRefreshAct->setEnabled(false);
     connect(autoRefreshAct, SIGNAL(triggered(bool)),
             settingsTree, SLOT(setAutoRefresh(bool)));
     connect(autoRefreshAct, SIGNAL(triggered(bool)),
             refreshAct, SLOT(setDisabled(bool)));

     fallbacksAct = new QAction(tr("&Fallbacks"), this);
     fallbacksAct->setShortcut(tr("Ctrl+F"));
     fallbacksAct->setCheckable(true);
     fallbacksAct->setEnabled(false);
     connect(fallbacksAct, SIGNAL(triggered(bool)),
             settingsTree, SLOT(setFallbacksEnabled(bool)));

     aboutAct = new QAction(tr("&About"), this);
     connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

     aboutQtAct = new QAction(tr("About &Qt"), this);
     connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));

 #ifndef Q_WS_MAC
     openPropertyListAct->setEnabled(false);
 #endif
 #ifndef Q_WS_WIN
     openRegistryPathAct->setEnabled(false);
 #endif
 }

 void MainWindow::createMenus()
 {
     fileMenu = menuBar()->addMenu(tr("&File"));
     fileMenu->addAction(openSettingsAct);
     fileMenu->addAction(openIniFileAct);
     fileMenu->addAction(openPropertyListAct);
     fileMenu->addAction(openRegistryPathAct);
     fileMenu->addSeparator();
     fileMenu->addAction(refreshAct);
     fileMenu->addSeparator();
     fileMenu->addAction(exitAct);

     optionsMenu = menuBar()->addMenu(tr("&Options"));
     optionsMenu->addAction(autoRefreshAct);
     optionsMenu->addAction(fallbacksAct);

     menuBar()->addSeparator();

     helpMenu = menuBar()->addMenu(tr("&Help"));
     helpMenu->addAction(aboutAct);
     helpMenu->addAction(aboutQtAct);
 }

 void MainWindow::setSettingsObject(QSettings *settings)
 {
     settings->setFallbacksEnabled(fallbacksAct->isChecked());
     settingsTree->setSettingsObject(settings);

     refreshAct->setEnabled(true);
     autoRefreshAct->setEnabled(true);

     QString niceName = settings->fileName();
     niceName.replace("\\", "/");
     int pos = niceName.lastIndexOf("/");
     if (pos != -1)
         niceName.remove(0, pos + 1);

     if (!settings->isWritable())
         niceName = tr("%1 (read only)").arg(niceName);

     setWindowTitle(tr("%1 - %2").arg(niceName).arg(tr("Settings Editor")));
 }