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Java™ Platform Standard Ed. 6 |
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java.lang.Object java.util.EventObject java.awt.dnd.DropTargetEvent java.awt.dnd.DropTargetDragEvent
public class DropTargetDragEvent
The DropTargetDragEvent
is delivered to a
DropTargetListener
via its
dragEnter() and dragOver() methods.
The DropTargetDragEvent
reports the source drop actions
and the user drop action that reflect the current state of
the drag operation.
Source drop actions is a bitwise mask of DnDConstants
that represents the set of drop actions supported by the drag source for
this drag operation.
User drop action depends on the drop actions supported by the drag source and the drop action selected by the user. The user can select a drop action by pressing modifier keys during the drag operation:
Ctrl + Shift -> ACTION_LINK Ctrl -> ACTION_COPY Shift -> ACTION_MOVEIf the user selects a drop action, the user drop action is one of
DnDConstants
that represents the selected drop action if this
drop action is supported by the drag source or
DnDConstants.ACTION_NONE
if this drop action is not supported
by the drag source.
If the user doesn't select a drop action, the set of
DnDConstants
that represents the set of drop actions supported
by the drag source is searched for DnDConstants.ACTION_MOVE
,
then for DnDConstants.ACTION_COPY
, then for
DnDConstants.ACTION_LINK
and the user drop action is the
first constant found. If no constant is found the user drop action
is DnDConstants.ACTION_NONE
.
Field Summary |
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Fields inherited from class java.awt.dnd.DropTargetEvent |
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context |
Fields inherited from class java.util.EventObject |
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source |
Constructor Summary | |
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DropTargetDragEvent(DropTargetContext dtc,
Point cursorLocn,
int dropAction,
int srcActions)
Construct a DropTargetDragEvent given the
DropTargetContext for this operation,
the location of the "Drag" Cursor 's hotspot
in the Component 's coordinates, the
user drop action, and the source drop actions. |
Method Summary | |
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void |
acceptDrag(int dragOperation)
Accepts the drag. |
DataFlavor[] |
getCurrentDataFlavors()
This method returns the current DataFlavor s from the
DropTargetContext . |
List<DataFlavor> |
getCurrentDataFlavorsAsList()
This method returns the current DataFlavor s
as a java.util.List |
int |
getDropAction()
This method returns the user drop action. |
Point |
getLocation()
This method returns a Point
indicating the Cursor 's current
location within the Component' s
coordinates. |
int |
getSourceActions()
This method returns the source drop actions. |
Transferable |
getTransferable()
This method returns the Transferable object that represents the data associated with the current drag operation. |
boolean |
isDataFlavorSupported(DataFlavor df)
This method returns a boolean indicating
if the specified DataFlavor is supported. |
void |
rejectDrag()
Rejects the drag as a result of examining either the dropAction or the available DataFlavor
types. |
Methods inherited from class java.awt.dnd.DropTargetEvent |
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getDropTargetContext |
Methods inherited from class java.util.EventObject |
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getSource, toString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public DropTargetDragEvent(DropTargetContext dtc, Point cursorLocn, int dropAction, int srcActions)
DropTargetDragEvent
given the
DropTargetContext
for this operation,
the location of the "Drag" Cursor
's hotspot
in the Component
's coordinates, the
user drop action, and the source drop actions.
dtc
- The DropTargetContext for this operationcursorLocn
- The location of the "Drag" Cursor's
hotspot in Component coordinatesdropAction
- The user drop actionsrcActions
- The source drop actions
NullPointerException
- if cursorLocn is null
IllegalArgumentException
- if dropAction is not one of
DnDConstants
.
IllegalArgumentException
- if srcActions is not
a bitwise mask of DnDConstants
.
IllegalArgumentException
- if dtc is null
.Method Detail |
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public Point getLocation()
Point
indicating the Cursor
's current
location within the Component'
s
coordinates.
Component
's coords.public DataFlavor[] getCurrentDataFlavors()
DataFlavor
s from the
DropTargetContext
.
public List<DataFlavor> getCurrentDataFlavorsAsList()
DataFlavor
s
as a java.util.List
java.util.List
of the Current DataFlavor
spublic boolean isDataFlavorSupported(DataFlavor df)
boolean
indicating
if the specified DataFlavor
is supported.
df
- the DataFlavor
to test
public int getSourceActions()
public int getDropAction()
public Transferable getTransferable()
InvalidDnDOperationException
- if the data associated with the drag
operation is not availablepublic void acceptDrag(int dragOperation)
DropTargetListeners
dragEnter
,
dragOver
, and dropActionChanged
methods if the implementation wishes to accept an operation
from the srcActions other than the one selected by
the user as represented by the dropAction
.
dragOperation
- the operation accepted by the targetpublic void rejectDrag()
dropAction
or the available DataFlavor
types.
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Java™ Platform Standard Ed. 6 |
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