Scriptaculous events onStart + onEnd

[Stefan Lindner]

Dear Ryan,

I have implemented the Scriptaculous dragAndDrop events onStart und
onEnd. The implementation is experimental at the moment but it works
fine. To do a proper implementation I need to extend the
DraggabeBehavior class. Are you interrested in a collaboration in
development of Scriptaculous for wicket? Or should I simply generate a
patch? The questions I want do discuss are:

1. The DraggableBehavior class has a common respond-method, currently
commented as //no callback...yet

2. Now it would be possible to something like

        enum DragEventType = {NONE, ON_START, ON_END}

        private DragEventType dragEventType = none;

        protected DragEventType getEventType( return dragEventType; );


        protected void respond(AjaxRequestTarget target) {
                // extract eventType from target
                dragEventType = extractedEventType;
        }

        -----

        The client could do
        @Overwrite
        protected void respond(AjaxRequestTarget target) {
                super(target);

                switch (getEventType()) {
                        case ON_START....
                        case ONENDSTART....
                }
        }

3. Or we could do something like 

        protected void onStart(AjaxRequestTarget target){}

        protected void onEnd(AjaxRequestTarget target){}

        protected void respond(AjaxRequestTarget target) {
                // extract eventType from target
                if (eventType == onStart)
                        onStart();
                else fi (eventType == onEnd)
                        onEnd();
        }

        -----

        The client could do
        @Overwrite
        protected void onEnd(AjaxRequestTarget target) {
                // do onEnd processing
        }

4. In both cases we need something like

                public void setOnStart(boolean createOnStartListender)
...

                public void setOnEnd(boolean createOnEndListender) ...

5. We also could implement the onHover event of the DraggableTarget to
complete the drag and drop events.

Please let me know which was you want to go.

Keep on Wicket!

Stefan Lindner