From: Olivier Andrieu <oandrieu at nerim.net>
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Message-ID: <16234.9043.451350.678876 at karryall.dnsalias.org>
Date: Thu, 18 Sep 2003 23:27:47 +0200
To: Richard Jones <rich at annexia.org>
Cc: lablgtk at kaba.or.jp
Subject: Re: unmap event never sent to widgets?
In-Reply-To: <20030905162656.GA18479 at redhat.com>
References: <20030905162656.GA18479 at redhat.com>

Hi again,

 Richard Jones [Friday 5 September 2003] :
 > Below is a much shortened version of the large Gtk program I'm working
 > on.  There are two problems with this program:
 > 
 > (a) I can never get Gtk to send an "unmap" event to my custom
 > widget. I need this, because my widget needs to unregister itself from
 > something when it is removed from the screen.

Hum, I'm not sure you're connecting the right signal. I think
realize/unrealize would work better. Unfortunately, unrealize is not
wrapped (it's a single line to add though).

 > (b) In the particular program below, clicking the "red" or "green"
 > buttons once works, but subsequently no widget appears. The widget
 > appears to have died in some way. Why?

It's the X window that changes. Removing a widget unrealizes
it. Re-adding it creates a new window. So you have to replace :

    val drawable = lazy (new GDraw.drawable da#misc#window)
    method private drawable = Lazy.force drawable

by :
    method private drawable = new GDraw.drawable da#misc#window

(or smthg smarter)

-- 
   Olivier