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[GEF4] Dynamic graph attributes [message #1710022]

Fri, 02 October 2015 17:36

Greg Watson

Messages: 115
Registered: July 2009

Senior Member

I'm using the JFace Zest API. I would like to be able to change node and edge attributes (e.g. color) dynamically, say in response to a user selecting a node. I'm using the IGraphNodeLabelProvider to set the attributes, but the only way I can see to change the graph dynamically is to call the refresh() method on the ZestContentViewer. Unfortunately this has the effect of recreating the entire graph, which seems pretty undesirable for a mouse click. Also it means I lose any state information that was cached regarding the model.

Is there a better way to achieve this?

Thanks,
Greg

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Re: [GEF4] Dynamic graph attributes [message #1710182 is a reply to message #1710022]

Mon, 05 October 2015 08:38

Alexander Nyssen

Messages: 244
Registered: July 2009
Location: Lünen

Senior Member

You can do this easily my using underlying MVC mechanisms. You can either bind an AbstractFXOnClickPolicy for Node- or EdgeContentPart, that is directly called by the FXClickDragTool whenever the user clicks the respective visuals. Alternatively, you can bind an IBehavior that registers it self as listener on the SelectionModel of the FXViewer. The first is the option that should be used if you want to have it undoable, the latter if not.

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