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TreeItem expansion strategy [message #454682]

Wed, 27 April 2005 13:32

Max Rotvel

Messages: 21
Registered: July 2009

Junior Member

I have a two-layered Tree where I want all the topitems to be expanded
at creation time.

If I call setExpanded(true) on the topitems, before adding the subitems,
they are not expanded. If I call setExpanded(true) after adding the
subitems, the topitems are expanded properly.

Is this behaviour intentional? unavoidable? a bug?

Regards
--
Max - rotvel AT bolignet-aarhus DOT dk

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Re: TreeItem expansion strategy [message #454787 is a reply to message #454682]

Thu, 28 April 2005 17:00

Emil Crumhorn

Messages: 169
Registered: July 2009

Senior Member

Sound like correct behavior to me. If the parent has no children, how can it
expand to show what it doesn't have?

I realize you want setExpanded to end up like a flag on the folder so when
stuff is added to it, it knows it's supposed to be expanded and does so.

If you use a TreeViewer with content providers and such, you could create
your own listeners on the treenode objects that could do it the way you
wanted. Simply store an expanded boolean flag on the node, and when children
get added you check to see if it's true, and then expand.

Hope that helps.

Emil

"Max Rotvel" <rotvel@bolignet-aarhus.dk> wrote in message
news:op.spv7wzkp94ko3h@trixie.katlan...
>I have a two-layered Tree where I want all the topitems to be expanded
> at creation time.
>
> If I call setExpanded(true) on the topitems, before adding the subitems,
> they are not expanded. If I call setExpanded(true) after adding the
> subitems, the topitems are expanded properly.
>
> Is this behaviour intentional? unavoidable? a bug?
>
> Regards
> --
> Max - rotvel AT bolignet-aarhus DOT dk

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Re: TreeItem expansion strategy [message #454844 is a reply to message #454787]

Sun, 01 May 2005 08:51

Max Rotvel

Messages: 21
Registered: July 2009

Junior Member

Ok, thanks for the clarification. It would be nice with the described
'flaglike'
behavior, but it's no big deal working around it in my project.

On Thu, 28 Apr 2005 19:00:53 +0200, Emil Crumhorn <crumhorn@speakeasy.net>
wrote:

> Sound like correct behavior to me. If the parent has no children, how
> can it
> expand to show what it doesn't have?
>
> I realize you want setExpanded to end up like a flag on the folder so
> when
> stuff is added to it, it knows it's supposed to be expanded and does so.
[snip]

> "Max Rotvel" <rotvel@bolignet-aarhus.dk> wrote in message
> news:op.spv7wzkp94ko3h@trixie.katlan...
>> I have a two-layered Tree where I want all the topitems to be expanded
>> at creation time.
>>
>> If I call setExpanded(true) on the topitems, before adding the subitems,
>> they are not expanded. If I call setExpanded(true) after adding the
>> subitems, the topitems are expanded properly.
[snip]

Regards
--
Max - rotvel AT bolignet-aarhus DOT dk

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