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# mainwindow.cpp Example File
demos/mainwindow/mainwindow.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2004-2006 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::LeftDockWidgetArea },
             { "LightGrey", 0, Qt::RightDockWidgetArea },
             { "DarkGrey", 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);
     }