UniDummyapp (Workshop Notifier - Qt6 C++ App)

A simple Qt6 C++ desktop app for a workshop demo.

Features

• System tray notification via QSystemTrayIcon::showMessage()
• Notification counter displayed in the notification
• Falls back to QMessageBox if the system tray is unavailable

Prerequisites

• Qt 6.x (with Widgets module)
• CMake ≥ 3.16
• A C++17 compiler (GCC, Clang, MSVC)

Install Qt on Ubuntu/Debian:

sudo apt install qt6-base-dev cmake build-essential

Install Qt on Arch:

sudo pacman -S qt6-base cmake

On Windows/macOS, use the Qt Online Installer.

Build with CMake (recommended)

cmake -B build -S .
cmake --build build
./build/WorkshopNotifier      # Linux/macOS
build\WorkshopNotifier.exe    # Windows

Project structure

qt-workshop-app/
├── CMakeLists.txt       # CMake build
├── main.cpp             # Entry point
├── mainwindow.h         # MainWindow declaration
├── mainwindow.cpp       # MainWindow implementation
└── mainwindow.ui        # Qt Designer UI form

How it works

Qt class	Role
QMainWindow	Top-level application window
QSystemTrayIcon	System tray icon + notification sender
QSystemTrayIcon::showMessage()	Sends the desktop notification
QMessageBox	Fallback when tray is not available
QPushButton (signal clicked())	Triggers onNotifyClicked() slot

The clicked() signal of the button is connected to the onNotifyClicked() slot directly in the .ui file's <connections> section, so no manual connect() call is needed in code.