OpenEuphoria

Re: Win32Lib: Disable Focusability

• Posted by Don <eunexus at yahoo.com> Aug 04, 2004
• 486 views

> > 1> subclass the control and intercept all mouse events unless
> >    its over the scroll bar.
> 
> Can you explain what it means to subclass a control? Thanks!!! :)

Sure thing.

Lets say you create a plain window and have a message loop for it.
In most cases (with Win32Lib) it has a message loop and it doles out
messages to your routines depending on which ones you need.

Subclassing involves taking over of the normal message loop and replacing
it with one of your own.  I could (in effect) have Windows send my routine
*all* messages meant for the window before Win32Lib (or anything else)
can see it and do my own processing first.  In the case of the ListView,
we could subclass the control and handle all mouse events ourselves.  Any
message we dont process I can pass to its normal handler (Win32Lib).  Its
simply a way to customize a controls behaviour with our own routine.


Don Phillips - aka Graebel
     National Instruments
     mailto: eunexus @ yahoo.com