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How to consume KeyEvent in E4 [message #1742269]

Thu, 01 September 2016 10:01

Matthias Fiebiger

Messages: 2
Registered: September 2016

Junior Member

Hello their,

I'm looking for a possibility to consume KeyEvents in E4.
In standard Java I would call java.awt.event.KeyEvent.consume().
No further Listener would receive this Event.

What to do in E4 to achieve this? I have not found a equivalent methode in
org.eclipse.swt.events.KeyEvent .

Or: is there a way to differentiate the source device of the KeyEvent?

Why i want to do this?:
I want to use a barcodescanner. The scanner is handled like a common Keyboarddevice. I have extended the org.eclipse.swt.widgets.Listener Interface to detect barcodes - it works. But the actually focused component will also receive the KeyEvents of the Scanner.

Thanks for your help.

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Re: How to consume KeyEvent in E4 [message #1742295 is a reply to message #1742269]

Thu, 01 September 2016 13:14

Erdal Karaca

Messages: 853
Registered: July 2009

Senior Member

Maybe, you want this:

org.eclipse.swt.events.KeyEvent.doit

Just set it to false which will break further processing by remaining listeners.

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Re: How to consume KeyEvent in E4 [message #1742500 is a reply to message #1742295]

Fri, 02 September 2016 12:43

Matthias Fiebiger

Messages: 2
Registered: September 2016

Junior Member

Thanks for your response.
I tried this some days ago. On Your Advice I tried it again. Sometimes it seems to work (Event Consumed), but in most cases not (Event processed by other Listeners).
In what order the Listeners in E4 are processed? Is there a place to register Listeners to be handled first?
My BarcodeListener is registered in the end of the @PostConstruct Methode of a Part. It listens to the display.

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