[Gambas-user] How to organize dependent lists

[nando]

The second level OBJECT[] actually turns out to be an array of Classes.
My experience is people understand the OBJECT[] way because of the container
within a container concept.
It is the same thing :)



---------- Original Message -----------
From: tobi <tobiasboege01 at ...1601...>
To: info at ...394..., mailing list for gambas users <gambas-user at lists.sourceforge.net>
Sent: Tue, 28 Feb 2012 18:33:26 +0100
Subject: Re: [Gambas-user] How to organize dependent lists

> hi,
> 
> On Tue, 28 Feb 2012, Rolf-Werner Eilert wrote:
> 
> > Hi folks,
> > 
> > I would be interested in your opinions. In a project I've got two lists 
> > of data and further data which are mutually dependent, such as
> > 
> > item 1:
> >     item 1 a
> >        data 1 aa
> >        data 1 ab
> >     item 1 b
> >        data 1 ba
> >        data 1 bb
> > 
> > and so on, which could be seen like a tree or directory structure.
> > 
> > Now my question is, how would YOU organize this internally? I mean, what 
> > kind of data structure would you prefer to be able to easily find your 
> > way through it? In the GUI, it looks like two ListBoxes and two TextBoxes:
> > 
> > List1   List2     TextBox1
> >                    TextBox2
> > 
> > If you choose item1 in List1, List2 will show item1a and item1b. When 
> > you choose item1a, the Textboxes show data1aa and data1ab. If you choose 
> > item1b, the Textboxes show data1ba and data1bb.
> > 
> > Of course, I could make a matrix of
> > 
> > item1  item1a  data1aa
> > item1  item1a  data1ab
> > item1  item1b  data1ba
> > item1  item1b  data1bb
> > 
> > but how would my program EASILY find which data to show if the user 
> > clicks item1a for instance? Another idea was to leave out repetitions:
> > 
> > item1  item1a  data1aa
> >                 data1ab
> >         item1b  data1ba
> >                 data1bb
> > 
> > This shows the tree-like structure better, but is it a professional 
> > approach?
> > 
> > Thanks for your ideas.
> > 
> > Rolf
> > 
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> 
> well, my approach would be using a class that has an array of instances of the 
> same class (reminds me of linked lists). i don't know if it is possible in 
> gambas, haven't tried or read about it but it may look like:
> 
> ---
> CNode.class:
> 
> Public Children As CNode[]
> ---
> 
> or, which may be more intuitive in later usage:
> 
> ---
> CNode.class:
> 
> Inherits Array
> 
> Public Children As CNode[]
> 
> Public Function _get(iInd As Integer) As CNode
>   Return Me.Children[iInd]
> End
> ---
> 
> in fact, i haven't programmed in Gambas for about a month and have no 
> possibility to check my suggestions but i think you see the point.
> 
> regards,
> tobi
> 
> ------------------------------------------------------------------------------
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------- End of Original Message -------