CODEWITHSUNDEEP
javadrag-and-dropswtjface
Georgian
Georgian

Reputation: 8960

JFace different instances of dropped POJO

I have a Label wrapped in a POJO. All external operations are delegated to the label.

I (internally) hook a DragSource to the said Label. Transfer is LocalSelectionTransfer.

Implementation of DragSourceAdapter:

@Override public void dragSetData(DragSourceEvent e)
{
      transfer.setSelection(new StructuredSelection(this)); // *this* is the POJO wrapper
}

Question:

On drop events (externally), if I do 

final Object newObj = ((StructuredSelection) transfer.getSelection()).getFirstElement();

newObj would be POJO$1, or POJO$2 etc.

What's the reason? Why don't I get an instanceof POJO?

Upvotes: 1

Views: 57

Answers (1)

Alexey Romanov
Alexey Romanov

Reputation: 170745

As you say, new StructuredSelection(this) is inside the implementation of DragSourceAdapter, so this is the implementation (an anonymous inner class of your "POJO") instead of the POJO itself! You need instead new StructuredSelection(POJO.this) to refer to the outer instance (obviously, replace POJO with the actual name of your class).

A bit of an aside, but I wouldn't call a class which is concerned with GUI directly a "POJO".

Upvotes: 1

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