OpenEuphoria

RE: Win32Lib setHandler() suggestion

• Posted by Derek Parnell <Derek.Parnell at SYD.RABOBANK.COM> Jun 10, 2002
• 473 views

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Tone,
v0.57+ can be used to create a chain of handlers for a control.

example:

  -- Set a chain of handlers.
  setHandler( btn1, w32HClick, routine_id("click_buttons"))
  if DebugSwitch = True then
      -- add a second routine to be called.
      setHandler( btn1, w32HClick, routine_id("Debugger"))
  end if

The routines are called in the same order as they are set.

To remove the current handler(s) for a control, set it to -1.

example:
  setHandler( btn1, w32HClick, -1)

To replace the current handler(s) for a control, set it the first one to -1.

example:
  setHandler( btn1, w32HClick, {-1, routine_id("Special_Click"))


To add a handler at the beginning of the chain use getHandler first...

example:
       object hl
       -- Make sure my handler is installed before any others.
       -- First, get the current handlers.
       hl = getHandler(myWindow, w32HPaint)
       -- Chain mine to the front.
       setHandler(myWindow, w32HPaint, -1 & routine_id("mypainter") & hl)

-----------
Derek.
> -----Original Message-----
> From: tone.skoda at siol.net [mailto:tone.skoda at siol.net]
> Sent: Sunday, 9 June 2002 11:13
> To: EUforum
> Subject: Win32Lib setHandler() suggestion
> 
> 
> 
> When you set two event handlers for same control
> first one is deleted.
> It would be better and more simple
> if both would be called
> when the event happens.
> 
> This would be especially useful
> for writing custom controls,
> like custom drawn treeview.
> 
> Or is it already working like that? :^)
> 
> 
> 
> 

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