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From: cmcmanis@sun.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: proportional gadgets
Message-ID: <17434@sun.uucp>
Date: Mon, 27-Apr-87 14:25:19 EDT
Article-I.D.: sun.17434
Posted: Mon Apr 27 14:25:19 1987
Date-Received: Wed, 29-Apr-87 00:46:59 EDT
References: <3294@jade.BERKELEY.EDU>
Organization: Sun Microsystems, Inc. - Mtn View, CA
Lines: 55
Summary: Set a Timer for repeat

In article <3294@jade.BERKELEY.EDU>, (Randy Spencer) writes:
>                                                         ... I am 
> working on that word processing project and I can't seem to figure 
> out how to let the user press in that area outside that gadgets knob
> and have the mouse button repeat.  I want to let the use scroll down
> by pressing the mouse button down with the pointer near the bottom,
> but now it only moves one window per click.
> 
> If there are any ideas out there, please fill me in on them...
> Randy Spencer      P.O. Box 4542   Berkeley  CA  94704        (415)284-4740 

Randy and others, this is just an idea but it should work. If you are set
to receive both MOUSEBUTTONS and MOUSEMOVE events then you could use the 
following senario ...

When you get a BUTTON_DOWN in the prop gadget you will also get a new
value for that gadget (it moves). Start a timerrequest asyncronously for
'n' micros. If you get a BUTTON_UP you AbortIO() the timer request, if
the timer request completes (Sets a Sig_bit which your while loop is 
waiting on anyway) then internally diddle the propgadget and adjust it 
again. Then reset the timer. So in psuedo code it would look something
Like ... [WINDOWSIG is a macro to get the signal bit from the user port)

    while (1) {
	Igot = Wait(WINDOWSIG(win) | 1<<Timersigbit);
 	if ((Igot & WINDOWSIG(win)) != 0) {
	   Msg = GetMsg(WINDOWPORT(win));
	   class = Msg -> Class; 
	   /* get all of the useful stuff out of Msg */
	   ReplyMsg(Msg); /* Then reply to it */
	   switch (class) {
	      case BUTTON_DOWN : set timer;
	      case BUTTON_UP : abort timer;
	      case MOUSE_MOVE : 
			if (out of gadget) abort_timer;
			else ignore;
              .... and so on handling all of the messages ...
	   }
         }
         else { /* else the timer kicked us */
           diddle prop gadget;
	   RefreshGadgets(win,propgadget,1);
	   ... update window appropriately ...
	   SendIO(timerrequest); /* kick off another timer request */
	}
    }

Note, I haven't tried this but I can't see anything obviously wrong 
with it. 

-- 
--Chuck McManis
uucp: {anywhere}!sun!cmcmanis   BIX: cmcmanis  ARPAnet: cmcmanis@sun.com
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