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I quickly checked my GrViews. Yes, Gerard is right as always.
The constant "MyViews.View" is actually useful in more than place, so in
GrViews I defined a constant, which is indeed not exported.
CONST
viewTypeName = "GrViews.View";
Then I used it in the following places:
PROCEDURE (v: View) HandlePropMsg- (VAR msg: Properties.Message);
....
| msg: Properties.TypePref DO
IF msg.type = viewTypeName THEN msg.view := v END
PROCEDURE (v: View) HandleCtrlMsg* (f: Views.Frame;
....
WITH msg: Controllers.PollOpsMsg DO
(* see tutorial 10, View construction, ObxViews4*)
msg.valid := {Controllers.copy};
msg.selectable := FALSE; (* TRUE --> Select All will be anabled *)
msg.type := viewTypeName
.. and finaly, in several places in the procedure GrViews.Focus,
which was kindly suggested to me by Wolfgang Weck.
PROCEDURE Focus*(): View;
Procedure Focus became a workhorse which retrieves a GrView from
any container. It may be relevant here, because Robert is developing
some sort of a view whose role is to be embedded in a container.
I used Focus in procedures such as GrViews.GetLegends, GrViews.SetLegends,
and many others, whose role is to transfer some data (e.g., legends or
scaling) between an interactor and the embedded view. In such a way I can
have several views embedded in a form or in a text, and I can change
their looks using one common tool dialog. I do not have to close the
dialog when going from one GrView to another.
Focus is the core difference between the GrView and the LibPlotter
"editors" which only work on a given LibPlotter. In that sense,
LibPlotter "editors" are modal, while GrView dialogs are modeless.
It is good to know how the modeless interface was implemented with
Wolfgang's help.
Hope it helps -- W.
On Thu, 27 Jul 2006, Gérard Meunier wrote:
> Sorry, but I forgot one step:
>
> 3) Add also these lines in the HandleCtrlMsg procedure:
>
> WITH
> ...
> |msg: Controllers.PollOpsMsg DO
> msg.type := "MyViews.View";
> ...
> END;
>
> From the docu: The field "type" denotes a context for the focus view.
> This context is used to determine which menus are relevant for the focus
> view. As a convention, a view assigns the type name of its abstract base
> pointer type to type, e.g., "TextViews.View". This convention guarantees
> globally unique context names, since module names are considered
> globally unique. If the view doesn't support any such context, ignore
> this field.
>
> Consequently, there is no need to export "MyViews.View".
>
> Gérard
--- BlackBox
--- send subject HELP or UNSUBSCRIBE to blackbox{([at]})nowhere.xy
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Received on Thu Jul 27 2006 - 21:14:25 UTC