OpenEuphoria

Re: Win32Lib: Disable Focusability

• Posted by Derek Parnell <ddparnell at bigpond.com> Aug 04, 2004
• 450 views

Don wrote:
> 
> > > 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.


D'oh!! I forgot about the 'subclassing' trick. 

In Win32lib, all you need to do to avoid selecting items in a listview
is this ...

 procedure Event_lv(integer self, integer event, sequence parms)
   if find(parms[1],{WM_LBUTTONDOWN, WM_RBUTTONDOWN}) then
      returnValue(-1)
   end if
 end procedure
 setHandler(lv, w32HEvent, routine_id("Event_lv"))


-- 
Derek Parnell
Melbourne, Australia