Eclipse GEF and Draw2d Plug-in Developer Guide (Galileo) - DelegatingDropAdapter (Eclipse GEF API Specification)

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org.eclipse.gef.dnd
Class DelegatingDropAdapter

java.lang.Object
  

org.eclipse.jface.util.DelegatingDropAdapter
      
org.eclipse.gef.dnd.DelegatingDropAdapter

All Implemented Interfaces:: DropTargetListener

public class DelegatingDropAdapter
extends DelegatingDropAdapter

A DropTargetListener that manages and delegates to a set of TransferDropTargetListeners. Each TransferDropTargetListener can then be implemented as if it were the DropTarget's only DropTargetListener.

On each DropTargetEvent, a current listener is obtained from the set of all TransferDropTargetListers. The current listener is the first listener to return true for TransferDropTargetListener#isEnabled(DropTargetEvent). The current listener is forwarded all DropTargetEvents until some other listener becomes the current listener, or the Drop terminates.

As listeners are added and removed, the combined set of Transfers is updated to contain the Tranfer from each listener. getTransferTypes() provides the merged transfers. This set of Transfers should be set on the SWT DropTarget.

See Also:: Serialized Form

Constructor Summary

DelegatingDropAdapter ()


Method Summary

void addDropTargetListener ( TransferDropTargetListener listener)
          Deprecated.

Transfer[] getTransferTypes ()
          Deprecated. use getTransfers() instead

void removeDropTargetListener ( TransferDropTargetListener listener)
          Removes the given TransferDropTargetListener.

Methods inherited from class org.eclipse.jface.util. DelegatingDropAdapter

addDropTargetListener, dragEnter, dragLeave, dragOperationChanged, dragOver, drop, dropAccept, getTransfers, isEmpty, removeDropTargetListener

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DelegatingDropAdapter

public DelegatingDropAdapter()

Method Detail

addDropTargetListener

public void addDropTargetListener(
TransferDropTargetListener listener)

Deprecated.

Adds the given TransferDropTargetListener.

Parameters:: listener - the listener

getTransferTypes

public Transfer[] getTransferTypes()

Deprecated. use getTransfers() instead

Adds the Transfer from each listener to an array and returns that array.

Returns:: the merged Transfers from all listeners

removeDropTargetListener

public void removeDropTargetListener(
TransferDropTargetListener listener)

Removes the given TransferDropTargetListener.

Parameters:: listener - the listener