Is JavaFX keyboard event handling too rigid?

Stephen F Northover steve.x.northover at
Fri Jun 13 15:15:02 UTC 2014

You should be able to use event filtering to get in the way of any event 
before it is delivered to the control.  If you provide some sample code 
for what you are trying to do, we can take a look at it and suggest a 
possible solution.


On 2014-06-13, 10:39 AM, Tomas Mikula wrote:
> Hi Randahl,
> I think the general advice is to avoid subclassing controls if
> possible. You can create your custom control that embeds a text field
> and filter events on your custom control so they never reach the
> embedded text field.
> Tomas
> On Fri, Jun 13, 2014 at 10:11 AM, Randahl Fink Isaksen
> <randahl at> wrote:
>> I have noticed that quite many developers are having trouble avoiding triggering of focus navigation occurring when a user presses the UP and DOWN arrow keys. From a number of different forum posts I have seen how people are jumping through hoops to avoid this.
>> I myself have the challenge, that I need to use the UP and DOWN keys for changing the selected autocompletion in a text field, and it seems that no matter how greedily I try to consume or filter out these KeyEvents, JavaFX still insists on moving the focus from one field to the next.
>> This got me thinking: Why is JavaFX keyboard event handling so rigid? If you implement a control which listens for keyboard events on itself and does some cool stuff, that is fine. But once you implement a subclass that wishes to replace some of that behaviour you are in trouble, because once the EventHandlers are registered, there is no public API to replace them.
>> Is this a conscious design decision? Is it something that I should file a feature request on, or have I overlooked a part of the API which could be used here?
>> Randahl

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