Path: utzoo!attcan!uunet!wuarchive!uwm.edu!mailrus!iuvax!bsu-cs!mithomas
From: mithomas@bsu-cs.bsu.edu (Michael Thomas Niehaus)
Newsgroups: comp.sys.mac.programmer
Subject: List Manager strangeness
Message-ID: <10152@bsu-cs.bsu.edu>
Date: 22 Sep 89 15:09:55 GMT
Organization: CS Dept, Ball St U, Muncie, Indiana
Lines: 73

I am trying to get the List Manager to keep a list of items for me in a
modeless dialog.  So far, everything works as planned, but I occasionally
get strange behaviors.  For example, sometimes I can select the first item
in the list, then click on the second (with no modifier keys) and still
manage to select both cells.  Double clicking on any cell does not get
LClick to return true, unless the above behavior is also happening at the
same time.  Does anyone know what is going on?

For diagnostic purposes (and general interest), I have included the portion
of source code that creates the dialog, replaces the userItem with the list
update routine, etc.  Does anyone see any problems with this?

Thanks for any help.  (By the way, this is from my Booz program, the Zoo
archive extracting application.  I have posted this to comp.binaries.mac,
but nothing I have ever sent there has made it past the moderator.  I guess
it is not seen as useful.  This code is actually from my latest version, but
the version that I posted has the same behavior, annoying but not severe.)

-Michael

	SetDAFont(21);	
	localDialog=GetNewDialog(133,0,-1);
	SetWTitle((WindowPtr) localDialog,whatFile);
	SelectWindow( (WindowPtr) localDialog);
	SetPort(localDialog);
	SetDAFont(0);

	csize.v=0;
	csize.h=199;
	SetRect(&viewRect,10,10,200,200);
	SetRect(&dataBounds,0,0,1,0);

	GetDItem( localDialog, 2, &itemType, &theItemHandle, &theItemRect );
	SetDItem( localDialog, 2, itemType, UpdateList, &theItemRect );
	
	localList = LNew(&viewRect,&dataBounds,csize,0,localDialog,
		true,false,false,true);
	SetWRefCon(localDialog,(long) localList);
	LActivate(true,localList);
	
	/*  Open file, read header and entries.  */
	
	SetFPos(localFile, 1,zoo_header.zoo_start);
	theCell.h=0;
	theCell.v=-1;
	
	rd_dir(&direntry,localFile);

	while (direntry.next != 0L )
	{
		if (direntry.lo_tag != LO_TAG || direntry.hi_tag != HI_TAG)
		{
			prterror (stopAlert, "\pBad entry in archive");
			err=-1;
			break;
		}
		theCell.v=LAddRow(1,theCell.v+1,localList);
		if (direntry.namlen==0)
			LSetCell(&(direntry.fname),
                          strlen((char *) &(direntry.fname)),theCell,localList);
		else
			LSetCell(&(direntry.lfname),direntry.namlen,
				theCell,localList);
		SetFPos (localFile, 1, direntry.next);
		rd_dir (&direntry,localFile);
	}
	LUpdate( (localDialog)->visRgn,localList);

	
-- 
Michael Niehaus        UUCP: <backbones>!{iuvax,pur-ee}!bsu-cs!mithomas
Apple Student Rep      ARPA:  mithomas@bsu-cs.bsu.edu
Ball State University  AppleLink: ST0374 (from UUCP: st0374@applelink.apple.com)