package com.vaadin.tests.dd;
import java.util.Map;
import com.vaadin.event.dd.DragAndDropEvent;
import com.vaadin.event.dd.DropHandler;
import com.vaadin.event.dd.DropTarget;
import com.vaadin.event.dd.TargetDetails;
import com.vaadin.event.dd.acceptcriteria.AcceptAll;
import com.vaadin.event.dd.acceptcriteria.AcceptCriterion;
import com.vaadin.ui.AbstractComponent;
import com.vaadin.ui.Component;
import com.vaadin.ui.CssLayout;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.Layout;
/**
* Test/Example/Draft code how to build custom DD implementation using the thing
* framework provided by Vaadin.
*
*/
public class CustomDDImplementation extends CustomComponent {
public CustomDDImplementation() {
Layout l = new CssLayout();
l.addComponent(new MyDropTarget());
l.addComponent(new MyDragSource());
}
/**
* Server side component that accepts drags must implement HasDropHandler
* that have one method to get reference of DropHandler.
*
* DropHandler may be implemented directly or probably most commonly using a
* half baked implementation {@link AbstractDropHandler}.
*
* Check the @ClientWidget
*
*/
class MyDropTarget extends AbstractComponent implements DropTarget {
@Override
public DropHandler getDropHandler() {
return new DropHandler() {
@Override
public void drop(DragAndDropEvent event) {
// Do something with data
return;
}
@Override
public AcceptCriterion getAcceptCriterion() {
return AcceptAll.get();
}
};
}
@Override
public TargetDetails translateDropTargetDetails(
Map<String, Object> clientVariables) {
// If component has some special drop details that it needs to
// translate for server side use, developer must return a
// DragDropDetails here. If details does not exist or raw client
// side data is ok, it is safe to return null here.
return null;
}
}
/**
* Server side implementation of source does not necessary need to contain
* anything.
*
* Check the @ClientWidget
*
* However component might have different modes to support starting drag
* operations that are controlled via server side api.
*
*/
public class MyDragSource extends AbstractComponent implements Component {
}
}