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https://issues.apache.org/jira/browse/PIVOT-670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932698#action_12932698
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Frédéric VERGEZ commented on PIVOT-670:
---------------------------------------
Good point
Yes, GWT has the same issue on listeners, and was coded the very same way
(using Widget).
Slightly changing though, with Events and Handlers (with some generic in it)
> Generic types for listeners
> ---------------------------
>
> Key: PIVOT-670
> URL: https://issues.apache.org/jira/browse/PIVOT-670
> Project: Pivot
> Issue Type: Improvement
> Environment: All
> Reporter: Frédéric VERGEZ
> Priority: Trivial
>
> Could listener interfaces have generic types ?
> This would allow to be type safe in methods, and avoid objects casting.
> For instance in a ComponentMouseListener:
> public interface ComponentMouseListener<T extends Component> {
> /**
> * Component mouse button listener adapter.
> */
> public static class Adapter implements ComponentMouseListener {
> @Override
> public boolean mouseMove(T component, int x, int y) {
> return false;
> }
> @Override
> public void mouseOver(T component) {
> }
> @Override
> public void mouseOut(T component) {
> }
> }
> /**
> * Called when the mouse is moved over a component.
> *
> * @param component
> * @param x
> * @param y
> *
> * @return
> * <tt>true</tt> to consume the event; <tt>false</tt> to allow it to
> * propagate.
> */
> public boolean mouseMove(T component, int x, int y);
> /**
> * Called when the mouse enters a component.
> *
> * @param component
> */
> public void mouseOver(T component);
> /**
> * Called when the mouse exits a component.
> *
> * @param component
> */
> public void mouseOut(T component);
> }
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