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chapter 8

implementation support

Implementation support

• programming tools
  • levels of services for programmers
• windowing systems
  • core support for separate and simultaneous user-

system activity

• programming the application and control of dialogue
• interaction toolkits
  • bring programming closer to level of user perception
• user interface management systems
  • controls relationship between presentation and

functionality

Elements of windowing systems

Device independence

programming the abstract terminal device drivers

image models for output and (partially) input

• pixels
• PostScript (MacOS X, NextStep)
• Graphical Kernel System (GKS)
• Programmers' Hierarchical Interface to Graphics

(PHIGS)

Resource sharing

achieving simultaneity of user tasks

window system supports independent processes

isolation of individual applications

roles of a windowing system

The client-server architecture

X Windows architecture

Programming the application - 1

read-evaluation loop

repeat read-event(myevent) case myevent.type type_1: do type_1 processing type_2: do type_2 processing ... type_n: do type_n processing end case end repeat

Programming the application - 1

notification-based

void main(String[] args) { Menu menu = new Menu(); menu.setOption(“Save”); menu.setOption(“Quit”); menu.setAction(“Save”,mySave) menu.setAction(“Quit”,myQuit) ... }

int mySave(Event e) { // save the current file }

int myQuit(Event e) { // close down }