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Create a tree dynamically with NatTable [message #1842284]

Tue, 15 June 2021 12:35

Laksono Adhianto

Messages: 5
Registered: July 2009

Junior Member

I have a huge tree data structure and I don't want to load all the data into the memory. Loading data dynamically is possible with JFace's TreeViewer but due to scalability issues (especially on Linux/GTK) we plan to move to NatTable.

However, it seems NatTable creates a tree from a flat list and not from a tree structure (according to Drk Fauth https://www.eclipse.org/forums/index.php/t/1066327/) which requires loading all data into memory.

The question: Is it possible to create a tree dynamically with NatTable?
Perhaps without using GlazedLists? There was a discussion to use NatTable without GlazedLists in https://www.eclipse.org/forums/index.php/t/695642/ but I don't see any progress or examples.

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Re: Create a tree dynamically with NatTable [message #1842289 is a reply to message #1842284]

Tue, 15 June 2021 14:12

Dirk Fauth

Messages: 47
Registered: March 2020

Member

There are examples for trees without GlazedLists. Have a look at our example application.

And yes typically a tree is built from a flat list. But at the end you have a tree model. In which way you implement it is your responsibility. I know from users that even created a tree row model that actually loads data from a database on demand. But that is commercial and not open source.

So to answer your question, yes it is possible, No there are no examples for such extended use cases.

And we now also have the HierarchicalTreeLayer that actually operates on a tree structure internally. But that one also uses GlazedLists. Just to give you an idea that many things are possible with NatTable. It is only not everything included in the framework and you need to to extended things yourself.

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