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From: sirkm@ssyx.ucsc.edu (Greg Anderson)
Newsgroups: comp.sys.mac.programmer
Subject: What's wrong with this ModalDialog filterproc?
Message-ID: <10125@saturn.ucsc.edu>
Date: 26 Dec 89 16:29:35 GMT
Sender: usenet@saturn.ucsc.edu
Reply-To: sirkm@ssyx.ucsc.edu (Greg Anderson)
Organization: UC Santa Cruz; Division of Social Sciences
Lines: 80

I wrote a filterproc for ModalDialog that allows the user to cut, copy
and paste to fields in a modal dialog box by pressing command-c, command-x
and command-v, respectively.  The filterproc works great--cutting and
pasting work as expected.  However, if the user presses <Return>,
ModalDialog no longer returns with itemHit = 1.

IM I-416 says:

"A function result of TRUE tells ModalDialog to return immediately
rather than handle the event; in this case, the filterProc function
sets itemHit to the item number that ModalDialog should return."

I thought that's what I did, but it doesn't work.  When the user
presses <Return> or <Enter> the filterProc beeps (note the inclusion
of a Sysbeep() in the filterProc), but the <Return> is added to
the active textedit field rather than causing modaldialog to exit
with itemHit = 1.

I'm using the MPW C.  Here's the filterProc:

/*----------------------------------------------------------------------
|  This filter, when passed to ModalDialog, will allow the user to
|  cut, copy and paste by pressing command-X, command-C or command-V,
|  respectively.
----------------------------------------------------------------------*/
pascal int cutPasteFilter( DialogPtr dlog, EventRecord *theEvent, int *itemHit )
{
	char		key;
	
	/*
	 *  We only wish to filter keyDown events.
	 */
	if( theEvent->what == keyDown )
	{
		key = theEvent->message & charCodeMask;
		/*
		 *  Is the command key down?
		 */
		if( theEvent->modifiers & cmdKey )
		{
			switch( key )
			{
			case 'x':
				ZeroScrap();
				DlgCut( dlog );
				if( TEToScrap() != noErr )
					SysBeep(0);
				break;
						
			case 'c':
				ZeroScrap();
				DlgCopy( dlog );
				if( TEToScrap() != noErr )
					SysBeep(0);
				break;
						
			case 'v':
				if( TEFromScrap() == noErr )
					DlgPaste( dlog );
				else
					SysBeep(0);
				break;
			}
			theEvent->what = nullEvent;
			return(false);
		}
		else if( (key == 13) || (key == 3) )
		{
			SysBeep(0);
			*itemHit = 1;
			return(true);
		}
	}
	return(false);
}

  ___\    /___               Greg Anderson              ___\    /___ 
  \   \  /   /         Social Sciences Computing        \   \  /   /
   \  /\/\  /    University of California, Santa Cruz    \  /\/\  /
    \/    \/              sirkm@ssyx.ucsc.edu             \/    \/