RE: Missing method!

From: [at]} <support{>
Date: Wed, 19 Mar 2003 09:21:58 +0100

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René,

one reason why there is no Close procedure for Views.View is that it would
be rather difficult to define the semantics of such an operation for all
circumstances.

Views are not always opened in a new window as for example in
"ObxCubes.Deposit; StdCmds.Open" but can also be inserted into other views
(so called container views). An example for the latter case would be an
error marker view (DevMarkers.View) inserted by the compiler into an
incorrect program text. Since for text elements only operations like insert,
move, and delete are defined, the intended effect of closing an embedded
view wouldn't immediately be clear.

Somewhat similar problems arise if views are wrapped by other views, e.g. by
a StdScroller. What would be the correct behavior for the wrapper if the
wrapped view suddenly vanishes?

The question gets even more involved if you take BlackBox's hierarchical
version of the model-view-controller framework into account. As it is
explained in chapter 2 "Compound Documents" of the BlackBox tutorial, there
are situations where the same view gets displayed in several windows. What
should happen in this case?

As you can see, there may be no best solution for the general problem. So,
it's probably better to handle the Close operation for a given view instance
depending on the concrete problem at hand. The solution suggested by Robert
would certainly work but often there are more elegant ways to get rid of
open views -- maybe even by delegating this task to the user as it is done
in most document centered user interfaces.

Cheers
Marc,
Oberon microsystems, Inc.




-----Original Message-----
From: René Dorta [mailto:rene{([at]})nowhere.xy
Sent: Montag, 17. März 2003 00:21
To: BlackBox
Subject: Missing method!


Why such a handy method as "Close" is missing from Views.View?.
How can I close a specific view "v"?...
Would be so nice just to say "v.Close",
without caring about "v" being the current focus or not.


Thanks folks!
René Dorta
Universidad de Carabobo. Valencia. Venezuela.



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Received on Wed Mar 19 2003 - 09:21:58 UTC

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