[Gambas-user] Gambas-user Digest, Vol 107, Issue 12

[ML]

Marty,

First off, sorry for the delay. I made a how-to example, but I'd prefer
to also post it to the list so everybody else can benefit from it.
Please find it attached. Loads of comments, little code. It's really
surprising (and relieving) to see how easy it actually is!
Please check not only the comments in code, but the project description
as well.

As a side note, I'd like to ask the mods -if appropriate- to include it
in the How To wiki (or anywhere else they seem adequate).
Inter-class data passing is easy to implement, but there is a lack of
examples in the Wiki and Help.
Moreover the event sink routine naming scheme is a bit obscure but
obvious once you figure it out, yet no examples found in the official docs.

HTH,
zxMarce.

*On 15/Apr/2015 09:08, Martin McGlensey wrote:*
> Marce,
> Appreciate your suggestion. But, I'm totally confused by your explanation. I do not know how to implement it. Could you provide an example? Send it as an attachment to N3MOW at ...3467... That way I'll get it. The intent is to read the datasource.table   property on form A for use in form B and to assign the datasource to a datasource object on form B. No changes need be made to the datasource properties on form A.
> Marty
>
> *Message: 1
> Date: Tue, 14 Apr 2015 11:48:02 -0300
> From: ML <d4t4full at ...626...>
> Subject: Re: [Gambas-user] Reading control properties from a collection
> To: mailing list for gambas users <gambas-user at lists.sourceforge.net>
> Message-ID: <552D28A2.8040305 at ...626...>
> Content-Type: text/plain; charset=windows-1252
> *Marty,
> Never a good idea to dirty your fingers poking a form's controls from another one. Been there, done that, regretted it for a looooong time.
> I'd do this instead, and it's a general-purpose approach that served me well for a long time, no matter the cross-forms (or even cross-class) data you need:
> In the form (call it *frmA*) that has the data the other form (call it *frmB*) needs, I'd publish the necessary data as appropriate type's *Public Property*(*ies*).
> I would also -if necessary- set up some kind of *Event* in *frmA* that triggers when the sought data changes.
> Then, in *frmB*, I'd *Dim* a *Private* *Object* of type *frmA* and instance and show it whenever necessary.
> In *frmB*'s event handler for *frmA*'s event -or in code, your call- I'd check the *Public Property*(*ies*) of *frmA*. Doing it this way not only isolates your data access from the underlying implementation, but also you can radically change HOW you access data to be published in *frmA* while not touching *frmB* at all.
> Then, you may fetch data in *frmA* from a database, flat file or TCP socket, and *frmB* will function the same, no code mods necessary. An additional advantage is no time wasted on for-loops.
> HTH,
> zxMarce.
>
> *On 14/Apr/2015 11:00, Martin McGlensey wrote:* Hello, I have a form that contains a named datasource. I want to read the name and table properties of that datasource from another form. Both forms are visible.
> I've used the loop "For each hWindow in Windows" to test to see if the form is visible. If it is I cycle through the control collection for that form till I find an Object.Type = "DataSource". So far so good - I can find the datasource and assign it to a variant variable (DataTable).
> Now if I do strX = DataTable.Name it returns "DataSource1"  instead of "Neighborhood" the name of the datasource on the form containing the collection.
> I want to get to the datasource name and table from the first form. They should be name=neighborhood and table=tblneighborhood. If I assign frmEntry.Neighborhood to datatable on the second form then I get the correct
> data returned. I think it should be possible to get this data from the forms collection but, I have not figured out how.
> So can it be done and if so how?
> Regards,
> Marty
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