General GUI Design

• Applications have one 'Top Level' window.

  • A managed window (ie, has window system controls)
  • Acts as the root for other managed windows
  • Contains one or more 'container' widgets

• Containers manage the layout of control widgets.

• Control widgets handle user events.

  • Resize events automatically propagate through widget hierarchy
  • Explicit events (e.g., button pressed) are handled if widget is 'listening'
  • Associating an event handler function with a widget causes it to 'listen'

Notes: