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Mon, 30 December 2019 15:54

Messages: 5
Registered: November 2017

Junior Member

how to add a listener to the IConentViewer, When a part is selected, I can be notified!

Fri, 10 January 2020 14:22

Messages: 230
Registered: March 2015

Senior Member

Hi Lian,

the SelectionModel is registered as an adapter at the individual viewers (if not configured differently). Therefore, you can access it as follows: contentViewer.getAdapter(SelectionModel.class)

The SelectionModel maintains an ObservableList of selected ContentParts: selectionModel.getSelection()

You can register a ChangeListener there. However, you might need to postpone handling of such changes using Platform.runLater() so that certain reactions are already finished when you process it (depends on use case).

The codebase contains an example, e.g. in SelectionBehavior (which constructs/destructs feedback and handle parts for the selection):

- Accessing the SelectionModel: https://github.com/eclipse/gef/blob/bdade88d6620b4958f50aa7c3a632ebb256277db/org.eclipse.gef.mvc.fx/src/org/eclipse/gef/mvc/fx/behaviors/SelectionBehavior.java#L130
- Adding a listener: https://github.com/eclipse/gef/blob/bdade88d6620b4958f50aa7c3a632ebb256277db/org.eclipse.gef.mvc.fx/src/org/eclipse/gef/mvc/fx/behaviors/SelectionBehavior.java#L91

Best regards,
Matthias

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