How can you expand or collapse a certain topic in a hierachical box ?

For example let's say the expanded list box info looked like this:

Topic1

 Line 1

 Line 2

Topic 2

 Line 1

 Line 2

Topic 3

 Line 1

 Line 2

 Line 3

What I would like to do is programatically collapse just Topic2 so the screen will look like this :

Topic1

 Line 1

 Line 2

Topic 2

Topic 3

 Line 1

 Line 2

 Line 3

Also, on the same note, how can I initialize one of this list boxes so that when it first displays the info it is either all collapsed , all expanded or a combination of expanded and collapsed topics?

Dave Pociu

In the previous example, all the Line x lines were indented by a few spaces. They are supposed to be subs for the Topic x lines.

Just clarifying…

Dave,

]

Use the Send_Message function.

See on-line help on Send_Message

and the EXPAND message.

]

UnUsed=Send_Message( ListBoxCtrlId, "EXPAND", 4, 0 )

/* 4 because Topic2 is line 4 */

/* 0 because you want that line expanded to 0 more levels,

 in other words collapsed */

]

I assume you have initialized your list box

at design time, i.e in Form Designer.

I think there are two alternatives: Either as soon

as possible send the necessary collapse messages.

Or - if this causes too much flickering - leave

the list box empty at design time and initialize

it programatically instead. If you want to programatically

initialize the list box it's easiest when you

want everything expanded, because then you can

set the fairly straightforward LIST property.

When you want collapsed nodes, you must use the

more complicated LIST_EX property instead.

I haven't really used the LIST_EX property myself

yet, i.e I have tried to set LIST_EX in a more

complex setting and not succeeded completely.

But I think you will succeed as long as

you do it just once as an init and not try to

change it after the user has started using it.

Please tell me if you need any help.

- Oystein -

Oystein,

Thanks for the help. A little dirrection was all I needed so I don't waste too much time on what functions and properties deal with these list boxes. I can definitely continue from here.

Dave

There should be a whole paper in the next Works issue devoted to Hierarchical Boxes that answers all the questions I asked above and more.

I just got the "sneak-peak" of it e-mailed to me from a very helpful person at Revelation.

Dave,

What about a sneak-peek for me too?

- Oystein -

oystein.reigem@hd.uib.no

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