Qt 5.11 | Qt Widgets | System Tray Icon Example | window.cpp Example File

Qt 5.11.3 Reference Documentation

# window.cpp Example File

desktop/systray/window.cpp

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      #include "window.h"

      #ifndef QT_NO_SYSTEMTRAYICON

      #include <QAction>
      #include <QCheckBox>
      #include <QComboBox>
      #include <QCoreApplication>
      #include <QCloseEvent>
      #include <QGroupBox>
      #include <QLabel>
      #include <QLineEdit>
      #include <QMenu>
      #include <QPushButton>
      #include <QSpinBox>
      #include <QTextEdit>
      #include <QVBoxLayout>
      #include <QMessageBox>

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

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

          createActions();
          createTrayIcon();

          connect(showMessageButton, &QAbstractButton::clicked, this, &Window::showMessage);
          connect(showIconCheckBox, &QAbstractButton::toggled, trayIcon, &QSystemTrayIcon::setVisible);
          connect(iconComboBox, QOverload<int>::of(&QComboBox::currentIndexChanged),
                  this, &Window::setIcon);
          connect(trayIcon, &QSystemTrayIcon::messageClicked, this, &Window::messageClicked);
          connect(trayIcon, &QSystemTrayIcon::activated, this, &Window::iconActivated);

          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)
      {
      #ifdef Q_OS_OSX
          if (!event->spontaneous() || !isVisible()) {
              return;
          }
      #endif
          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()
      {
          showIconCheckBox->setChecked(true);
          QSystemTrayIcon::MessageIcon msgIcon = QSystemTrayIcon::MessageIcon(
                  typeComboBox->itemData(typeComboBox->currentIndex()).toInt());
          if (msgIcon == QSystemTrayIcon::NoIcon) {
              QIcon icon(iconComboBox->itemIcon(iconComboBox->currentIndex()));
              trayIcon->showMessage(titleEdit->text(), bodyEdit->toPlainText(), icon,
                                durationSpinBox->value() * 1000);
          } else {
              trayIcon->showMessage(titleEdit->text(), bodyEdit->toPlainText(), msgIcon,
                                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.png"), tr("Bad"));
          iconComboBox->addItem(QIcon(":/images/heart.png"), tr("Heart"));
          iconComboBox->addItem(QIcon(":/images/trash.png"), 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->addItem(QIcon(), tr("Custom icon"),
                  QSystemTrayIcon::NoIcon);
          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, &QAction::triggered, this, &QWidget::hide);

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

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

          quitAction = new QAction(tr("&Quit"), this);
          connect(quitAction, &QAction::triggered, qApp, &QCoreApplication::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);
      }

      #endif