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Drag an object from GEF and drop it in SWT composite [message #1798368]

Fri, 16 November 2018 09:37

Shenwei Zheng

Messages: 22
Registered: December 2016

Junior Member

Use case: click mouse on a JavaFX node, drag it to SWT composite and release mouse.
Initial condition: no element is selected. SelectionModel is empty.
Expected result: the model behind the node will be transferred to SWT composite.

Just after mouse click, a drag source listener is triggerred and drag starts. Here I check the org.eclipse.gef.mvc.fx.models.SelectionModel and it is empty. Drag will not continue. I realize that the selected IVisualPart will be added in SelectionModel after the drag starts.

Does anyone have an idea how to solve this problem? Thank you in advance.

Bests
Shenwei

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Re: Drag an object from GEF and drop it in SWT composite [message #1802138 is a reply to message #1798368]

Fri, 01 February 2019 18:05

Matthias Wienand

Messages: 230
Registered: March 2015

Senior Member

Hi Shenwei,

GEF "solves" this problem internally by executing IOnClickHandler before IOnDragHandler. In your situation, you probably need to defer the selection-check until the mouse is moved after drag started. Alternatively, you could check the hover model instead of the selection model.

Best regards,
Matthias

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