mainwindow.cpp Example File | Qt Widgets 5.12.8

- Qt 5.12
- Qt Widgets
- Settings Editor Example
- mainwindow.cpp Example File
- Qt 5.12.8 Reference Documentation

# mainwindow.cpp Example File

tools/settingseditor/mainwindow.cpp

     /****************************************************************************
     **
     ** 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."
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #include <QtWidgets>

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

     MainWindow::MainWindow()
         : settingsTree(new SettingsTree)
         , locationDialog(nullptr)
     {
         setCentralWidget(settingsTree);

         createActions();

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

         setWindowTitle(QCoreApplication::applicationName());
         const QRect availableGeometry = QApplication::desktop()->availableGeometry(this);
         adjustSize();
         move((availableGeometry.width() - width()) / 2, (availableGeometry.height() - height()) / 2);
     }

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

         if (locationDialog->exec() != QDialog::Accepted)
             return;

         SettingsPtr settings(new QSettings(locationDialog->format(),
                                            locationDialog->scope(),
                                            locationDialog->organization(),
                                            locationDialog->application()));

         setSettingsObject(settings);
         fallbacksAct->setEnabled(true);
     }

     void MainWindow::openIniFile()
     {
         const QString directory = QStandardPaths::writableLocation(QStandardPaths::ConfigLocation);
         const QString fileName =
             QFileDialog::getOpenFileName(this, tr("Open INI File"),
                                          directory, tr("INI Files (*.ini *.conf)"));
         if (fileName.isEmpty())
             return;

         SettingsPtr settings(new QSettings(fileName, QSettings::IniFormat));

         setSettingsObject(settings);
         fallbacksAct->setEnabled(false);
     }

     void MainWindow::openPropertyList()
     {
         const QString directory = QStandardPaths::writableLocation(QStandardPaths::ConfigLocation);
         const QString fileName =
             QFileDialog::getOpenFileName(this, tr("Open Property List"),
                                          directory, tr("Property List Files (*.plist)"));
         if (fileName.isEmpty())
             return;

         SettingsPtr settings(new QSettings(fileName, QSettings::NativeFormat));
         setSettingsObject(settings);
         fallbacksAct->setEnabled(false);
     }

     void MainWindow::openRegistryPath()
     {
         const 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())
             return;

         SettingsPtr 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()
     {
         QMenu *fileMenu = menuBar()->addMenu(tr("&File"));

         QAction *openSettingsAct = fileMenu->addAction(tr("&Open Application Settings..."), this, &MainWindow::openSettings);
         openSettingsAct->setShortcuts(QKeySequence::Open);

         QAction *openIniFileAct = fileMenu->addAction(tr("Open I&NI File..."), this, &MainWindow::openIniFile);
         openIniFileAct->setShortcut(tr("Ctrl+N"));

     #ifdef Q_OS_OSX
         QAction *openPropertyListAct = fileMenu->addAction(tr("Open Apple &Property List..."), this, &MainWindow::openPropertyList);
         openPropertyListAct->setShortcut(tr("Ctrl+P"));
     #endif // Q_OS_OSX

     #ifdef Q_OS_WIN
         QAction *openRegistryPathAct = fileMenu->addAction(tr("Open Windows &Registry Path..."), this, &MainWindow::openRegistryPath);
         openRegistryPathAct->setShortcut(tr("Ctrl+G"));
     #endif // Q_OS_WIN

         fileMenu->addSeparator();

         refreshAct = fileMenu->addAction(tr("&Refresh"), settingsTree, &SettingsTree::refresh);
         refreshAct->setShortcut(tr("Ctrl+R"));
         refreshAct->setEnabled(false);

         fileMenu->addSeparator();

         QAction *exitAct = fileMenu->addAction(tr("E&xit"), this, &QWidget::close);
         exitAct->setShortcuts(QKeySequence::Quit);

         QMenu *optionsMenu = menuBar()->addMenu(tr("&Options"));

         autoRefreshAct = optionsMenu->addAction(tr("&Auto-Refresh"));
         autoRefreshAct->setShortcut(tr("Ctrl+A"));
         autoRefreshAct->setCheckable(true);
         autoRefreshAct->setEnabled(false);
         connect(autoRefreshAct, &QAction::triggered,
                 settingsTree, &SettingsTree::setAutoRefresh);
         connect(autoRefreshAct, &QAction::triggered,
                 refreshAct, &QAction::setDisabled);

         fallbacksAct = optionsMenu->addAction(tr("&Fallbacks"));
         fallbacksAct->setShortcut(tr("Ctrl+F"));
         fallbacksAct->setCheckable(true);
         fallbacksAct->setEnabled(false);
         connect(fallbacksAct, &QAction::triggered,
                 settingsTree, &SettingsTree::setFallbacksEnabled);

         QMenu *helpMenu = menuBar()->addMenu(tr("&Help"));
         helpMenu->addAction(tr("&About"), this, &MainWindow::about);
         helpMenu->addAction(tr("About &Qt"), qApp, &QCoreApplication::quit);
     }

     void MainWindow::setSettingsObject(const SettingsPtr &settings)
     {
         settings->setFallbacksEnabled(fallbacksAct->isChecked());
         settingsTree->setSettingsObject(settings);

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

         QString niceName = QDir::cleanPath(settings->fileName());
         int pos = niceName.lastIndexOf(QLatin1Char('/'));
         if (pos != -1)
             niceName.remove(0, pos + 1);

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

         setWindowTitle(tr("%1 - %2").arg(niceName, QCoreApplication::applicationName()));
         statusBar()->showMessage(tr("Opened \"%1\"").arg(QDir::toNativeSeparators(settings->fileName())));
     }