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From Frédéric VERGEZ (JIRA) <j...@apache.org>
Subject [jira] Created: (PIVOT-670) Generic types for listeners
Date Tue, 16 Nov 2010 13:22:15 GMT
Generic types for listeners
---------------------------

                 Key: PIVOT-670
                 URL: https://issues.apache.org/jira/browse/PIVOT-670
             Project: Pivot
          Issue Type: Improvement
          Components: wtk
    Affects Versions: 1.5.2
         Environment: All
            Reporter: Frédéric VERGEZ
            Priority: Trivial
             Fix For: 2.1


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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