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From: fgreco@govt.shearson.com (Frank Greco)
Newsgroups: comp.windows.open-look
Subject: Controlling scrolling with views
Message-ID: <2v7v6w2@openlook.Unify.Com>
Date: 20 Feb 91 19:44:13 GMT
Lines: 43

Fellow Openlookers...

I need to create a splittable SCROLLABLE_PANEL where its
views scroll in tandem.  That is, if the user splits
the SCROLLABLE_PANEL vertically (ie, left and right),
I'd like all the views to scroll vertically if *any* of
their (vertical-only) scrollbars are scrolled.

My strategy was to interpose on the scrollbars (set on a
view whenever the user split them), and within my interpose
fn get the SCROLLBAR_VIEW_START for any scrollbar 
and then set this attribute to be the same for all the views.

I can create the SCROLLABLE_PANEL, make them splittable/joinable,
interpose on the scrollbars just fine...but I cannot seem
to be able to get the view's scrollbar in my split_proc().
...I need this to set the interpose fn for the new view.

Since SCROLLABLE_PANELS are OPENWINs, I would think that the 
following would get the view's scrollbar in my split_proc():
[called whenever the user splits a view]

	split_proc(origview, newview,  pos)
	Xv_Window origview, newview;
	int pos;
	{
		Scrollbar sbar;

		sbar = xv_get(newview, OPENWIN_VERTICAL_SCROLLBAR);

		...other stuff...

		notify_interpose_event_func(xv_get(sbar, SCROLLBAR_NOTIFY_CLIENT), doscroll, NOTIFY_SAFE);
	}

But I get a zero for sbar everytime.

Anyone got any ideas why this doesn't work?


Thanks everyone,

Frank G.