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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);
     QWidget::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);
 }


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Qt 4.3.5