A clean, comprehensive example demonstrating all PasGTK4 features.

# From project root
fpc -B example/example_main.pas -Fu./src -oexample/example_main

./example/example_main

• Modern HeaderBar with PopoverMenu
• GAction/GActionGroup system
• Clean modern GNOME design
• Recommended for new applications

./example/example_main --adwaita

• Native GNOME styling
• LibAdwaita widgets
• System theme integration

./example/example_main --compat

• Traditional GTK3-style menus
• Compatibility warnings
• For legacy applications

• TDemoApp - Modern GTK4 with HeaderBar (default)
• TAdwaitaApp - LibAdwaita application
• TCompatApp - Compatibility mode application

• Widget creation and management
• Menu systems (modern and traditional)
• Event handling with callbacks
• GAction system for modern apps
• Error handling and initialization
• Clean Pascal OOP patterns

• GTK4 development libraries
• LibAdwaita (for --adwaita mode)
• Free Pascal Compiler