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From: minow@mountn.dec.com (Martin Minow)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Window Zooming
Message-ID: <1329@mountn.dec.com>
Date: 4 Feb 90 02:07:43 GMT
References: <1453@raybed2.UUCP> <5544@hydra.gatech.EDU> <10003@hoptoad.uucp>
Reply-To: minow@thundr.enet.dec.com (Martin Minow)
Organization: Digital Equipment Corporation
Lines: 40

lef@raybed2.UUCP (Lee Fyock) asks how to handle window zoom events.
Here's a code fragment.  I don't remember where I copied it from
(possibly "How to Write Macintosh Software"):

void
do_mouse()
{
	WindowPtr		the_window;
	int			partcode;
	
	partcode = FindWindow(event.where, &the_window);	
	switch (partcode) {
	... other cases here ...
	case inZoomIn:
	case inZoomOut:
	    if (TrackBox(the_window, event.where, partcode))  {
		GrafPtr		save_port;
		
		GetPort(&save_port);
		SetPort(the_window);		
		EraseRect(&the_window->portRect);
		ZoomWindow(the_window, partcode, FALSE);
		InvalRect(&the_window->portRect);
		/*
		 * Do all the window specific things that are size-dependent,
		 * such as LSize.
		 */
		DrawGrowIcon(the_window);
		SetPort(save_port);
	    }
	    break;

It may possible to be more clever so you don't repaint the entire screen
when you change the window's size.  Also, I'm not certain whether the
GetPort/SetPort stuff is really needed.

Hope this helps.

Martin Minow
minow@thundr.enet.dec.com