DropTargetDragEvent (Java 2 Platform SE 5.0)

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Java^TM 2 Platform
Standard Ed. 5.0

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java.awt.dnd
Class DropTargetDragEvent

java.lang.Object
 extended by java.util.EventObject
 extended by java.awt.dnd.DropTargetEvent
 extended by java.awt.dnd.DropTargetDragEvent

All Implemented Interfaces:: Serializable

public class DropTargetDragEvent
extends DropTargetEvent
extends DropTargetEvent

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_MOVE

If 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.

Since:: 1.2
See Also:: Serialized Form

Field Summary

Fields inherited from class java.awt.dnd.DropTargetEvent
`context`

Fields inherited from class java.util.EventObject
`source`

Constructor Summary
`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
`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
`getDropTargetContext`

Methods inherited from class java.util.EventObject
`getSource, toString`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

DropTargetDragEvent

public 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.

Parameters:: dtc - The DropTargetContext for this operation; cursorLocn - The location of the "Drag" Cursor's hotspot in Component coordinates; dropAction - The user drop action; srcActions - The source drop actions
Throws:: 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

getLocation

public Point getLocation()

This method returns a Point indicating the Cursor's current location within the Component's coordinates.

Returns:: the current cursor location in Component's coords.

getCurrentDataFlavors

public DataFlavor[] getCurrentDataFlavors()

This method returns the current DataFlavors from the DropTargetContext.

Returns:: current DataFlavors from the DropTargetContext

getCurrentDataFlavorsAsList

public List<DataFlavor> getCurrentDataFlavorsAsList()

This method returns the current DataFlavors as a java.util.List

Returns:: a java.util.List of the Current DataFlavors

isDataFlavorSupported

public boolean isDataFlavorSupported(DataFlavor df)

This method returns a boolean indicating if the specified DataFlavor is supported.

Parameters:: df - the DataFlavor to test
Returns:: if a particular DataFlavor is supported

getSourceActions

public int getSourceActions()

This method returns the source drop actions.

Returns:: the source drop actions

getDropAction

public int getDropAction()

This method returns the user drop action.

Returns:: the user drop action

getTransferable

public Transferable getTransferable()

This method returns the Transferable object that represents the data associated with the current drag operation.

Returns:: the Transferable associated with the drag operation
Throws:: InvalidDnDOperationException - if the data associated with the drag operation is not available
Since:: 1.5

acceptDrag

public void acceptDrag(int dragOperation)

Accepts the drag. This method should be called from a 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.

Parameters:: dragOperation - the operation accepted by the target

rejectDrag

public void rejectDrag()

Rejects the drag as a result of examining either the dropAction or the available DataFlavor types.