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Content-type: text/plain
Juan Antonio,
BlackBox invalidates in procedure Controls.OpenLink the field c.item if the
Meta item is not bound to a variable, i.e. c.item.obj # Meta.varObj. The
reason for this is that although Meta is okay for variable binding it can
only call simple procedures. Dialog.Call implements a much more useful
command interpreter that allows you for example to execute the following
little script "StdLog.String('A'); StdLog.String('B'); StdLog.Ln" without
any need to deal with Meta items.
How does a control actually call the command? As mentioned before
Dialog.Call is the right tool to achieve this job. You have to include into
your control's HandleCtrlMsg2 method something along the following lines
...
Dialog.Call(c.prop.link)
...
ObxButtons, although just implementing a simple view instead of a full
fledged control, does exactly this. So, maybe you will also have a look at
that example for more information.
Cheers
Marc,
Oberon microsystems, Inc.
> -----Original Message-----
> From: Juan Antonio Ortega [mailto:amortega{([at]})nowhere.xy
> Sent: Donnerstag, 20. Februar 2003 21:23
> To: blackbox{([at]})nowhere.xy
> Subject: Meta.Item & Controls
>
>
> Hello everyone,
>
> When working with controls, the Controls.Control type has the read-only
> variable "item". This variable works nice when the control is linked to a
> variable. However, if I try to link the control to a procedure,
> item.Valid()
> is always false and item.obj, undefined. Could anyone explain this
> behaviour? Thanks.
>
> Regards,
> Juan Antonio
>
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Received on Fri Feb 21 2003 - 10:20:51 UTC