Path: utzoo!attcan!uunet!mcvax!ukc!strath-cs!glasgow!cathy
From: cathy@cs.glasgow.ac.uk (Catherine Anne Wood)
Newsgroups: comp.windows.news
Subject: Help required with damaged events
Keywords: Damaged Events, Repair of Canvases etc
Message-ID: <2726@crete.cs.glasgow.ac.uk>
Date: 4 Apr 89 21:58:07 GMT
Organization: Computing Sci, Glasgow Univ, Scotland
Lines: 51

This time I think I am really going crazy ....

After discovering to my cost that depending on retained canvas for fixing
damage to items in a window is a BAD idea,  I have been trying to catch 
Damaged events to do my own damage repair.  However, it seems that 
Damaged events are not being generated ... or if they are they are too
elusive for me to catch !

The test program I am using is simply displaying two ButtonItems which 
are overlapped, and then unmapping one. It remains visible until I 
repaint the whole window and its contents.

Using eventlog, it appears that Damaged events are not generated for the
ButtonItems, (but are being generated for the window's canvas when it
is damaged).

I am expressing interest in damaged events for the ItemCanvas of 
ButtonItems (I think!) and the ItemCanvases are opaque.

I inserted the  interest in the TrackInterests dictionary (the same place
as the interests EnterEvent ExitEvent etc are set up in liteitem.ps) ...
 see code below.


/TrackInterests 10 dict  begin
	 % Code for Enter interests etc
	.....

	/ClientDamaged /Damaged {ItemBegin RepairDamage ItemEnd} null ItemCanvas
	        eventmgrinterest def
	end def
} def

TrackInterests is then passed to forkeventmgr i.e.
	/ItemEventMgr TrackInterests forkeventmgr def
	

RepairDamage (at the moment) just prints out a message on the console to
say it has been called .. this never happens.


I guess I am doing something wrong somewhere  .. can anyone help me
please ?


Thanks,
Cathy.

ARPANet: cathy%cs.glasgow.ac.uk@nss.cs.ucl.ac.uk 
JANET  : cathy@uk.ac.glasgow.cs	UseNet:  mcvax!ukc!cs.glasgow.ac.uk!cathy
Mail   : Cathy Wood, Computer Science, 17 Lilybank Gardens, GB-GLASGOW G12 8QQ : 041 339-8855 ext 6040