Is JavaFX keyboard event handling too rigid?
tomas.mikula at gmail.com
Fri Jun 13 14:39:08 UTC 2014
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.
On Fri, Jun 13, 2014 at 10:11 AM, Randahl Fink Isaksen
<randahl at rockit.dk> 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?
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