3 Graphical User Interface

He also had a device which looked rather like a largish electronic calculator. This had about a hundred tiny flat press buttons and a screen about four inches square on which any one of a million `pages' could be summoned at a moment's notice. It looked insanely complicated, and this was one of the reasons why the snug plastic cover it fitted into had the words DON'T PANIC printed on it in large friendly letters.

DOUGLAS ADAMS The Hitchhiker's Guide to the Galaxy

• 3.1 Requirements
• 3.2 Architectural Design
  • 3.2.1 General Remarks
  • 3.2.2 Related Work
  • 3.2.3 Structure
  • 3.2.4 The Callback Concept
  • 3.2.5 Portability and Configurability
• 3.3 The VISTA Widget Set
  • 3.3.1 The PIF Editor
  • 3.3.2 The Simple Vector Graphics (SVG) Widget
  • 3.3.3 File Selection
  • 3.3.4 Widget Set Wrapping Layer
• 3.4 The VUI Library
  • 3.4.1 Widget Macros
  • 3.4.2 Chat Frames and Dialog Frames
  • 3.4.3 Tool Control Panels