mainwindow.cpp Example File
^{demos/mainwindow/mainwindow.cpp}

 /****************************************************************************
 **
 ** Copyright (C) 2004-2007 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the demonstration applications of the Qt Toolkit.
 **
 ** This file may be used under the terms of the GNU General Public
 ** License version 2.0 as published by the Free Software Foundation
 ** and appearing in the file LICENSE.GPL included in the packaging of
 ** this file.  Please review the following information to ensure GNU
 ** General Public Licensing requirements will be met:
 ** http://www.trolltech.com/products/qt/opensource.html
 **
 ** If you are unsure which license is appropriate for your use, please
 ** review the following information:
 ** http://www.trolltech.com/products/qt/licensing.html or contact the
 ** sales department at sales@trolltech.com.
 **
 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 **
 ****************************************************************************/

 #include "mainwindow.h"
 #include "colorswatch.h"
 #include "toolbar.h"

 #include <QAction>
 #include <QLayout>
 #include <QMenu>
 #include <QMenuBar>
 #include <QStatusBar>
 #include <QTextEdit>
 #include <QFile>
 #include <QDataStream>
 #include <QFileDialog>
 #include <QMessageBox>
 #include <QSignalMapper>
 #include <QApplication>
 #include <qdebug.h>

 static const char * const message =
     "<p><b>Qt Main Window Demo</b></p>"

     "<p>This is a demonstration of the QMainWindow, QToolBar and "
     "QDockWidget classes.</p>"

     "<p>The tool bar and dock widgets can be dragged around and rearranged "
     "using the mouse or via the menu.</p>"

     "<p>Each dock widget contains a colored frame and a context "
     "(right-click) menu.</p>"

 #ifdef Q_WS_MAC
     "<p>On Mac OS X, the \"Black\" dock widget has been created as a "
     "<em>Drawer</em>, which is a special kind of QDockWidget.</p>"
 #endif
     ;

 MainWindow::MainWindow(QWidget *parent, Qt::WindowFlags flags)
     : QMainWindow(parent, flags)
 {
     setObjectName("MainWindow");
     setWindowTitle("Qt Main Window Demo");

     setupToolBar();
     setupMenuBar();
     setupDockWidgets();

     QTextEdit *center = new QTextEdit(this);
     center->setReadOnly(true);
     center->setHtml(tr(message));
     center->setMinimumSize(400, 205);
     setCentralWidget(center);

     statusBar()->showMessage(tr("Status Bar"));
 }

 void MainWindow::actionTriggered(QAction *action)
 {
     qDebug("action '%s' triggered", action->text().toLocal8Bit().data());
 }

 void MainWindow::setupToolBar()
 {
     toolbar = new ToolBar(this);
     toolbar->setAllowedAreas(Qt::TopToolBarArea | Qt::BottomToolBarArea);
     addToolBar(toolbar);
 }

 void MainWindow::setupMenuBar()
 {
     QMenu *menu = menuBar()->addMenu(tr("&File"));

     QAction *action = menu->addAction(tr("Save layout..."));
     connect(action, SIGNAL(triggered()), this, SLOT(saveLayout()));

     action = menu->addAction(tr("Load layout..."));
     connect(action, SIGNAL(triggered()), this, SLOT(loadLayout()));

     action = menu->addAction(tr("Switch layout direction"));
     connect(action, SIGNAL(triggered()), this, SLOT(switchLayoutDirection()));

     menu->addSeparator();

     menu->addAction(tr("&Quit"), this, SLOT(close()));

     menuBar()->addMenu(toolbar->menu);
     dockWidgetMenu = menuBar()->addMenu(tr("&Dock Widgets"));
 }

 static void dump(const QByteArray &array)
 {
     QString s;
     for (int i = 0; i < array.count(); ++i) {
         s += ' ';
         s += QString::number((uchar)array.at(i));
     }
     qDebug() << "dump():" << s;
 }

 void MainWindow::saveLayout()
 {
     QString fileName
         = QFileDialog::getSaveFileName(this, tr("Save layout"));
     if (fileName.isEmpty())
         return;
     QFile file(fileName);
     if (!file.open(QFile::WriteOnly)) {
         QString msg = tr("Failed to open %1\n%2")
                         .arg(fileName)
                         .arg(file.errorString());
         QMessageBox::warning(this, tr("Error"), msg);
         return;
     }

     QByteArray geo_data = saveGeometry();
     QByteArray layout_data = saveState();

     bool ok = file.putChar((uchar)geo_data.size());
     if (ok)
         ok = file.write(geo_data) == geo_data.size();
     if (ok)
         ok = file.write(layout_data) == layout_data.size();

     if (!ok) {
         QString msg = tr("Error writing to %1\n%2")
                         .arg(fileName)
                         .arg(file.errorString());
         QMessageBox::warning(this, tr("Error"), msg);
         return;
     }
 }

 void MainWindow::loadLayout()
 {
     QString fileName
         = QFileDialog::getOpenFileName(this, tr("Load layout"));
     if (fileName.isEmpty())
         return;
     QFile file(fileName);
     if (!file.open(QFile::ReadOnly)) {
         QString msg = tr("Failed to open %1\n%2")
                         .arg(fileName)
                         .arg(file.errorString());
         QMessageBox::warning(this, tr("Error"), msg);
         return;
     }

     uchar geo_size;
     QByteArray geo_data;
     QByteArray layout_data;

     bool ok = file.getChar((char*)&geo_size);
     if (ok) {
         geo_data = file.read(geo_size);
         ok = geo_data.size() == geo_size;
     }
     if (ok) {
         layout_data = file.readAll();
         ok = layout_data.size() > 0;
     }

     if (ok)
         ok = restoreGeometry(geo_data);
     if (ok)
         ok = restoreState(layout_data);

     if (!ok) {
         QString msg = tr("Error reading %1")
                         .arg(fileName);
         QMessageBox::warning(this, tr("Error"), msg);
         return;
     }
 }

 QAction *addAction(QMenu *menu, const QString &text, QActionGroup *group, QSignalMapper *mapper,
                     int id)
 {
     bool first = group->actions().isEmpty();
     QAction *result = menu->addAction(text);
     result->setCheckable(true);
     result->setChecked(first);
     group->addAction(result);
     QObject::connect(result, SIGNAL(triggered()), mapper, SLOT(map()));
     mapper->setMapping(result, id);
     return result;
 }

 void MainWindow::setupDockWidgets()
 {
     QAction *action = dockWidgetMenu->addAction(tr("Animation"));
     action->setCheckable(true);
     action->setChecked(isAnimated());
     connect(action, SIGNAL(toggled(bool)), this, SLOT(setAnimated(bool)));

     action = dockWidgetMenu->addAction(tr("Nesting"));
     action->setCheckable(true);
     action->setChecked(isDockNestingEnabled());
     connect(action, SIGNAL(toggled(bool)), this, SLOT(setDockNestingEnabled(bool)));

     dockWidgetMenu->addSeparator();

     mapper = new QSignalMapper(this);
     connect(mapper, SIGNAL(mapped(int)), this, SLOT(setCorner(int)));

     QMenu *corner_menu = dockWidgetMenu->addMenu(tr("Top left corner"));
     QActionGroup *group = new QActionGroup(this);
     group->setExclusive(true);
     ::addAction(corner_menu, tr("Top dock area"), group, mapper, 0);
     ::addAction(corner_menu, tr("Left dock area"), group, mapper, 1);

     corner_menu = dockWidgetMenu->addMenu(tr("Top right corner"));
     group = new QActionGroup(this);
     group->setExclusive(true);
     ::addAction(corner_menu, tr("Top dock area"), group, mapper, 2);
     ::addAction(corner_menu, tr("Right dock area"), group, mapper, 3);

     corner_menu = dockWidgetMenu->addMenu(tr("Bottom left corner"));
     group = new QActionGroup(this);
     group->setExclusive(true);
     ::addAction(corner_menu, tr("Bottom dock area"), group, mapper, 4);
     ::addAction(corner_menu, tr("Left dock area"), group, mapper, 5);

     corner_menu = dockWidgetMenu->addMenu(tr("Bottom right corner"));
     group = new QActionGroup(this);
     group->setExclusive(true);
     ::addAction(corner_menu, tr("Bottom dock area"), group, mapper, 6);
     ::addAction(corner_menu, tr("Right dock area"), group, mapper, 7);

     dockWidgetMenu->addSeparator();

     static const struct Set {
         const char * name;
         uint flags;
         Qt::DockWidgetArea area;
     } sets [] = {
 #ifndef Q_WS_MAC
         { "Black", 0, Qt::LeftDockWidgetArea },
 #else
         { "Black", Qt::Drawer, Qt::LeftDockWidgetArea },
 #endif
         { "White", 0, Qt::RightDockWidgetArea },
         { "Red", 0, Qt::TopDockWidgetArea },
         { "Green", 0, Qt::TopDockWidgetArea },
         { "Blue", 0, Qt::BottomDockWidgetArea },
         { "Yellow", 0, Qt::BottomDockWidgetArea }
     };
     const int setCount = sizeof(sets) / sizeof(Set);

     for (int i = 0; i < setCount; ++i) {
         ColorSwatch *swatch = new ColorSwatch(tr(sets[i].name), this, Qt::WindowFlags(sets[i].flags));
         if (i%2)
             swatch->setWindowIcon(QIcon(QPixmap(":/res/qt.png")));
         addDockWidget(sets[i].area, swatch);
         dockWidgetMenu->addMenu(swatch->menu);
     }
 }

 void MainWindow::setCorner(int id)
 {
     switch (id) {
         case 0:
             QMainWindow::setCorner(Qt::TopLeftCorner, Qt::TopDockWidgetArea);
             break;
         case 1:
             QMainWindow::setCorner(Qt::TopLeftCorner, Qt::LeftDockWidgetArea);
             break;
         case 2:
             QMainWindow::setCorner(Qt::TopRightCorner, Qt::TopDockWidgetArea);
             break;
         case 3:
             QMainWindow::setCorner(Qt::TopRightCorner, Qt::RightDockWidgetArea);
             break;
         case 4:
             QMainWindow::setCorner(Qt::BottomLeftCorner, Qt::BottomDockWidgetArea);
             break;
         case 5:
             QMainWindow::setCorner(Qt::BottomLeftCorner, Qt::LeftDockWidgetArea);
             break;
         case 6:
             QMainWindow::setCorner(Qt::BottomRightCorner, Qt::BottomDockWidgetArea);
             break;
         case 7:
             QMainWindow::setCorner(Qt::BottomRightCorner, Qt::RightDockWidgetArea);
             break;
     }
 }

 void MainWindow::switchLayoutDirection()
 {
     if (layoutDirection() == Qt::LeftToRight)
         qApp->setLayoutDirection(Qt::RightToLeft);
     else
         qApp->setLayoutDirection(Qt::LeftToRight);
 }