 
 subsubsection3_8_1_1.html  section3_8.html  section3_8.html  tableofcontents3_1.html   Next: subsubsection3_8_1_1.html Widget Classes and Up: section3_8.html Tix Object Oriented  Previous: section3_8.html Tix Object Oriented    Introduction to Tix Object Oriented Programming  
Tix comes with a simple object oriented programming (OOP) framework,
  the 
Tix Intrinsics, for writing mega-widgets. The Tix
  Intrinsics is not a general purpose OOP system and it does not
  support some features found in general purpose OOP systems such as
  
[incr Tcl]. However, the Tix Intrinsics is specially designed
  for writing mega-widgets. It provides a simple and efficient
  interface for creating mega-widgets so that you can avoid the
  complexity and overheads of the general purpose OOP extensions to
  Tcl.
The hard thing about programming with mega-widgets is to make sure
  that each instance you create can handle its own activities.  Events
  must be directed to the right widget, procedures must act on data
  that is internal to that widget, and users should be able to change
  the options associated with the widget.  For instance, we'll show an
  arrow widget that needs to know what direction it's pointing; this
  requires each instance of the widget to have its own variable.
Furthermore, each widget should respond properly to changes
  requested by the application programmer during the program's run.
  The whole reason people use Tcl/Tk is because they can alter things
  on the fly.
The advantage of an object-oriented programming system is that you
  can easily associate a widget with its own data and procedures
  (methods).  This chapter shows how to do that, and how to configure
  data both at the time the widget is initialized and later during the
  program.
 
 subsubsection3_8_1_1.html#SECTION00081100000000000000 Widget Classes and Widget Instances   subsubsection3_8_1_2.html#SECTION00081200000000000000 What is in a Widget Instance   subsubsectionstar3_8_1_3.html#SECTION00081300000000000000  Variables   subsubsectionstar3_8_1_4.html#SECTION00081400000000000000  Methods   subsubsectionstar3_8_1_5.html#SECTION00081500000000000000  Component Widgets  http://tix.sourceforge.nethttp://tix.sourceforge.net 