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/*
@VaadinApache2LicenseForJavaFiles@
*/
package com.vaadin.terminal.gwt.client.ui.dd;
import com.vaadin.terminal.gwt.client.ApplicationConnection;
import com.vaadin.terminal.gwt.client.ComponentConnector;
/**
* Vaadin Widgets that want to receive something via drag and drop implement
* this interface.
*/
public interface VDropHandler {
/**
* Called by DragAndDropManager when a drag operation is in progress and the
* cursor enters the area occupied by this Paintable.
*
* @param dragEvent
* DragEvent which contains the transferable and other
* information for the operation
*/
public void dragEnter(VDragEvent dragEvent);
/**
* Called by DragAndDropManager when a drag operation is in progress and the
* cursor leaves the area occupied by this Paintable.
*
* @param dragEvent
* DragEvent which contains the transferable and other
* information for the operation
*/
public void dragLeave(VDragEvent dragEvent);
/**
* Called by DragAndDropManager when a drag operation was in progress and a
* drop was performed on this Paintable.
*
*
* @param dragEvent
* DragEvent which contains the transferable and other
* information for the operation
*
* @return true if the Tranferrable of this drag event needs to be sent to
* the server, false if drop is rejected or no server side event
* should be sent
*/
public boolean drop(VDragEvent drag);
/**
* When drag is over current drag handler.
*
* With drag implementation by {@link VDragAndDropManager} will be called
* when mouse is moved. HTML5 implementations call this continuously even
* though mouse is not moved.
*
* @param currentDrag
*/
public void dragOver(VDragEvent currentDrag);
/**
* Returns the ComponentConnector with which this DropHandler is associated
*/
public ComponentConnector getConnector();
/**
* Returns the application connection to which this {@link VDropHandler}
* belongs to. DragAndDropManager uses this fucction to send Transferable to
* server side.
*/
public ApplicationConnection getApplicationConnection();
}
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