Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!shadooby!accuvax.nwu.edu!tank!ra_robert@gsbacd.uchicago.edu
From: ra_robert@gsbacd.uchicago.edu
Newsgroups: comp.sys.mac.programmer
Subject: Getting usrItem to draw itself during ModalDialog
Message-ID: <2580@tank.uchicago.edu>
Date: 3 Apr 89 15:27:56 GMT
Sender: news@tank.uchicago.edu
Distribution: na
Organization: University of Chicago Graduate School of Business
Lines: 46


I'm having a problem getting a usrItem in a dialog to be drawn.  Specifically,
I want to draw a bar graph which gets filled in (like the one you see now when
you copy files from one disk to another in the Finder).  To summarize, I
generate (or try to generate) an update event from my modalDialog's filter by
invaling my usrItem's rect, hoping this will force ModalDialog to handle the
update event, and call my usrItem's draw proc, getting the thing redrawn. 

So this would be my modal Dialog filter:

function theFilt (theDialogPtr: DialogPtr; var theEvent: EventRecord; var
itemHit: integer): BOOLEAN;

  var
   itemBox: rect;
   itemHandle: handle;
   itemType: integer;
   refcon: longint;
   theString: Str255;

 begin

theFilt := FALSE;
refcon := GetWRefCon(theDialogPtr);
GetDItem(theDialogPtr, DialogTwo_BarGraphItem, itemType, itemHandle, itemBox);
{get box containing barGraph}
InvalRect(itemBox);				{inval our barGraph's box,
forcing it to be redrawn}
SetWRefCon(theDialogPtr, refcon + 1);
 end;
 
This doesn't work; updateEvents don't seem to be generated, and the usrItem
doesn't get redrawn.  Why wouldn't this work?  I know I could call my usrItem's
draw proc from within my filter, but I thought this should work too.

Everything else is set up fine (setting ports, passing correct params).

Any info -- emailed or posted -- much appreciated.

Thanks,
 
Robert
------
ra_robert@gsbacd.uchicago.edu
------
generic disclaimer: all my opinions are mine