The problem with creating a composite widget

Question

am relatively new to gwt n dnd .. I created a composite widget .. when I try to make a composite widget object draggable, it throws an exception "dragHandle must implement HasMouseDownHandlers, HasMouseUpHandlers, HasMouseMoveHandlers and HasMouseOutHandlers to drag" I have something to lose is it very important?

Thanks Sindh

Answer 1

You can implement them as follows:

public class MyWidget extends Composite implements HasAllMouseHandlers, HasClickHandlers { ... public HandlerRegistration addClickHandler(ClickHandler handler) { return addDomHandler(handler, ClickEvent.getType()); } public HandlerRegistration addMouseDownHandler(MouseDownHandler handler) { return addDomHandler(handler, MouseDownEvent.getType()); } public HandlerRegistration addMouseMoveHandler(MouseMoveHandler handler) { return addDomHandler(handler, MouseMoveEvent.getType()); } public HandlerRegistration addMouseOutHandler(MouseOutHandler handler) { return addDomHandler(handler, MouseOutEvent.getType()); } public HandlerRegistration addMouseOverHandler(MouseOverHandler handler) { return addDomHandler(handler, MouseOverEvent.getType()); } public HandlerRegistration addMouseUpHandler(MouseUpHandler handler) { return addDomHandler(handler, MouseUpEvent.getType()); } public HandlerRegistration addMouseWheelHandler(MouseWheelHandler handler) { return addDomHandler(handler, MouseWheelEvent.getType()); } } 

For your widget to work, see this http://groups.google.com/group/gwt-dnd/browse_thread/thread/85039aaa229d53cf/f5ad10ff9a37ab9d?lnk=gst&q=custom+widget#f5ad10ff9a37ab9d