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# window.cpp Example File
desktop/systray/window.cpp

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     #include <QtGui>

     #include "window.h"

     Window::Window()
     {
         createIconGroupBox();
         createMessageGroupBox();

         iconLabel->setMinimumWidth(durationLabel->sizeHint().width());

         createActions();
         createTrayIcon();

         connect(showMessageButton, SIGNAL(clicked()), this, SLOT(showMessage()));
         connect(showIconCheckBox, SIGNAL(toggled(bool)),
                 trayIcon, SLOT(setVisible(bool)));
         connect(iconComboBox, SIGNAL(currentIndexChanged(int)),
                 this, SLOT(setIcon(int)));
         connect(trayIcon, SIGNAL(messageClicked()), this, SLOT(messageClicked()));
         connect(trayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
                 this, SLOT(iconActivated(QSystemTrayIcon::ActivationReason)));

         QVBoxLayout *mainLayout = new QVBoxLayout;
         mainLayout->addWidget(iconGroupBox);
         mainLayout->addWidget(messageGroupBox);
         setLayout(mainLayout);

         iconComboBox->setCurrentIndex(1);
         trayIcon->show();

         setWindowTitle(tr("Systray"));
         resize(400, 300);
     }

     void Window::setVisible(bool visible)
     {
         minimizeAction->setEnabled(visible);
         maximizeAction->setEnabled(!isMaximized());
         restoreAction->setEnabled(isMaximized() || !visible);
         QDialog::setVisible(visible);
     }

     void Window::closeEvent(QCloseEvent *event)
     {
         if (trayIcon->isVisible()) {
             QMessageBox::information(this, tr("Systray"),
                                      tr("The program will keep running in the "
                                         "system tray. To terminate the program, "
                                         "choose <b>Quit</b> in the context menu "
                                         "of the system tray entry."));
             hide();
             event->ignore();
         }
     }

     void Window::setIcon(int index)
     {
         QIcon icon = iconComboBox->itemIcon(index);
         trayIcon->setIcon(icon);
         setWindowIcon(icon);

         trayIcon->setToolTip(iconComboBox->itemText(index));
     }

     void Window::iconActivated(QSystemTrayIcon::ActivationReason reason)
     {
         switch (reason) {
         case QSystemTrayIcon::Trigger:
         case QSystemTrayIcon::DoubleClick:
             iconComboBox->setCurrentIndex((iconComboBox->currentIndex() + 1)
                                           % iconComboBox->count());
             break;
         case QSystemTrayIcon::MiddleClick:
             showMessage();
             break;
         default:
             ;
         }
     }

     void Window::showMessage()
     {
         QSystemTrayIcon::MessageIcon icon = QSystemTrayIcon::MessageIcon(
                 typeComboBox->itemData(typeComboBox->currentIndex()).toInt());
         trayIcon->showMessage(titleEdit->text(), bodyEdit->toPlainText(), icon,
                               durationSpinBox->value() * 1000);
     }

     void Window::messageClicked()
     {
         QMessageBox::information(0, tr("Systray"),
                                  tr("Sorry, I already gave what help I could.\n"
                                     "Maybe you should try asking a human?"));
     }

     void Window::createIconGroupBox()
     {
         iconGroupBox = new QGroupBox(tr("Tray Icon"));

         iconLabel = new QLabel("Icon:");

         iconComboBox = new QComboBox;
         iconComboBox->addItem(QIcon(":/images/bad.svg"), tr("Bad"));
         iconComboBox->addItem(QIcon(":/images/heart.svg"), tr("Heart"));
         iconComboBox->addItem(QIcon(":/images/trash.svg"), tr("Trash"));

         showIconCheckBox = new QCheckBox(tr("Show icon"));
         showIconCheckBox->setChecked(true);

         QHBoxLayout *iconLayout = new QHBoxLayout;
         iconLayout->addWidget(iconLabel);
         iconLayout->addWidget(iconComboBox);
         iconLayout->addStretch();
         iconLayout->addWidget(showIconCheckBox);
         iconGroupBox->setLayout(iconLayout);
     }

     void Window::createMessageGroupBox()
     {
         messageGroupBox = new QGroupBox(tr("Balloon Message"));

         typeLabel = new QLabel(tr("Type:"));

         typeComboBox = new QComboBox;
         typeComboBox->addItem(tr("None"), QSystemTrayIcon::NoIcon);
         typeComboBox->addItem(style()->standardIcon(
                 QStyle::SP_MessageBoxInformation), tr("Information"),
                 QSystemTrayIcon::Information);
         typeComboBox->addItem(style()->standardIcon(
                 QStyle::SP_MessageBoxWarning), tr("Warning"),
                 QSystemTrayIcon::Warning);
         typeComboBox->addItem(style()->standardIcon(
                 QStyle::SP_MessageBoxCritical), tr("Critical"),
                 QSystemTrayIcon::Critical);
         typeComboBox->setCurrentIndex(1);

         durationLabel = new QLabel(tr("Duration:"));

         durationSpinBox = new QSpinBox;
         durationSpinBox->setRange(5, 60);
         durationSpinBox->setSuffix(" s");
         durationSpinBox->setValue(15);

         durationWarningLabel = new QLabel(tr("(some systems might ignore this "
                                              "hint)"));
         durationWarningLabel->setIndent(10);

         titleLabel = new QLabel(tr("Title:"));

         titleEdit = new QLineEdit(tr("Cannot connect to network"));

         bodyLabel = new QLabel(tr("Body:"));

         bodyEdit = new QTextEdit;
         bodyEdit->setPlainText(tr("Don't believe me. Honestly, I don't have a "
                                   "clue.\nClick this balloon for details."));

         showMessageButton = new QPushButton(tr("Show Message"));
         showMessageButton->setDefault(true);

         QGridLayout *messageLayout = new QGridLayout;
         messageLayout->addWidget(typeLabel, 0, 0);
         messageLayout->addWidget(typeComboBox, 0, 1, 1, 2);
         messageLayout->addWidget(durationLabel, 1, 0);
         messageLayout->addWidget(durationSpinBox, 1, 1);
         messageLayout->addWidget(durationWarningLabel, 1, 2, 1, 3);
         messageLayout->addWidget(titleLabel, 2, 0);
         messageLayout->addWidget(titleEdit, 2, 1, 1, 4);
         messageLayout->addWidget(bodyLabel, 3, 0);
         messageLayout->addWidget(bodyEdit, 3, 1, 2, 4);
         messageLayout->addWidget(showMessageButton, 5, 4);
         messageLayout->setColumnStretch(3, 1);
         messageLayout->setRowStretch(4, 1);
         messageGroupBox->setLayout(messageLayout);
     }

     void Window::createActions()
     {
         minimizeAction = new QAction(tr("Mi&nimize"), this);
         connect(minimizeAction, SIGNAL(triggered()), this, SLOT(hide()));

         maximizeAction = new QAction(tr("Ma&ximize"), this);
         connect(maximizeAction, SIGNAL(triggered()), this, SLOT(showMaximized()));

         restoreAction = new QAction(tr("&Restore"), this);
         connect(restoreAction, SIGNAL(triggered()), this, SLOT(showNormal()));

         quitAction = new QAction(tr("&Quit"), this);
         connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
     }

     void Window::createTrayIcon()
     {
         trayIconMenu = new QMenu(this);
         trayIconMenu->addAction(minimizeAction);
         trayIconMenu->addAction(maximizeAction);
         trayIconMenu->addAction(restoreAction);
         trayIconMenu->addSeparator();
         trayIconMenu->addAction(quitAction);

         trayIcon = new QSystemTrayIcon(this);
         trayIcon->setContextMenu(trayIconMenu);
     }