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From: dmaustin@vivid.sun.com (Darren Austin - They are laughing AT me, not with me)
Newsgroups: comp.windows.x
Subject: Re: How to get Canvas from Xv_Window in XView?
Message-ID: <DMAUSTIN.90Aug16183558@vivid.sun.com>
Date: 17 Aug 90 01:35:58 GMT
References: <9039@uhccux.uhcc.Hawaii.Edu>
Sender: news@sun.Eng.Sun.COM
Organization: Sun Microsystems, Mountain View
Lines: 27
In-reply-to: denault@hale.ifa.hawaii.edu's message of 16 Aug 90 22:33:49 GMT

In article <9039@uhccux.uhcc.Hawaii.Edu> denault@hale.ifa.hawaii.edu (Tony Denault) writes:
   Using the XView toolkit, how can I obtain the Canvas from
   within the event_proc();

   I have a procedure to handle events into a canvas. This
   procedure services  4 Canvases used in my application.
   The event_proc() parameter are defined as:

   void event_proc( window, event)
     Xv_Window  window;
     Event      *event;

   How do I get the Canvas from the Xv_Window data structure? 
   Is their a way?

The Xv_Window is the paint window of the canvas, so you can do
the follow to get a handle to the canvas that it belongs to:

	canvas = (Canvas)xv_get(window, CANVAS_PAINT_CANVAS_WINDOW);

Cheers,
--Darren
--
Darren Austin                         |  Enough with safe and sane,
XView Technical Staff		      |    It's time for dumb and 
Sun Microsystems, Mountain View       |          dangerous!
dmaustin@sun.com	              |