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java.lang.Objectorg.eclipse.jface.util.DelegatingDragAdapter
org.eclipse.gef.dnd.DelegatingDragAdapter
public class DelegatingDragAdapter
A DragSourceListener that maintains and delegates to a set of
TransferDragSourceListener
s. Each TransferDragSourceListener can then
be implemented as if it were the DragSource's only DragSourceListener.
When a native Drag is started, a subset of all
TransferDragSourceListeners
is generated and stored in a list of
active listeners. This subset is calculated by forwarding
DragSourceListener.dragStart(DragSourceEvent)
to every listener, and
inspecting changes to the doit
field. The
DragSource
's set of supported Transfer types (
DragSource.setTransfer(Transfer[])
) is updated to reflect the
Transfer types corresponding to the active listener subset.
If and when DelegatingDragAdapter.dragSetData(DragSourceEvent)
is called, a single
TransferDragSourceListener
is chosen, and only it is allowed to
set the drag data. The chosen listener is the first listener in the subset of
active listeners whose Transfer supports (
Transfer.isSupportedType(TransferData)
) the dataType on the
DragSourceEvent
.
Constructor Summary | |
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DelegatingDragAdapter()
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Method Summary | |
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void |
addDragSourceListener(TransferDragSourceListener listener)
Deprecated. |
Transfer[] |
getTransferTypes()
Deprecated. call getTransfers() instead. |
void |
removeDragSourceListener(TransferDragSourceListener listener)
Deprecated. |
Methods inherited from class org.eclipse.jface.util.DelegatingDragAdapter |
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addDragSourceListener, dragFinished, dragSetData, dragStart, getTransfers, isEmpty, removeDragSourceListener |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public DelegatingDragAdapter()
Method Detail |
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public void addDragSourceListener(TransferDragSourceListener listener)
listener
- the new listenerpublic Transfer[] getTransferTypes()
Transfer
s from every
TransferDragSourceListener.
Transfer
spublic void removeDragSourceListener(TransferDragSourceListener listener)
listener
- the listener being removed
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