Class DropTargetDragEvent

java.lang.Object

java.util.EventObject

java.awt.dnd.DropTargetEvent

java.awt.dnd.DropTargetDragEvent

All Implemented Interfaces:

Serializable

public class DropTargetDragEvent
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 declared in class DropTargetEvent

context

Modifier and Type	Field	Description
protected DropTargetContext	context	The DropTargetContext associated with this DropTargetEvent.

Fields declared in class EventObject

source

Modifier and Type	Field	Description
protected Object	source	The object on which the Event initially occurred.

Constructor Summary

Constructors

Constructor	Description
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

Modifier and Type	Method	Description
void	acceptDrag(int dragOperation)	Accepts the drag.
DataFlavor[]	getCurrentDataFlavors()	This method returns the current DataFlavors from the DropTargetContext.
List<DataFlavor>	getCurrentDataFlavorsAsList()	This method returns the current DataFlavors 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 declared in class DropTargetEvent

getDropTargetContext

Modifier and Type	Method	Description
DropTargetContext	getDropTargetContext()	This method returns the DropTargetContext associated with this DropTargetEvent.

Methods declared in class EventObject

getSource, toString

Modifier and Type	Method	Description
Object	getSource()	The object on which the Event initially occurred.
String	toString()	Returns a String representation of this EventObject.

Methods declared in class Object

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

Modifier and Type	Method	Description
protected Object	clone()	Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
boolean	equals(Object o)	Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
protected void	finalize()	Deprecated, for removal: This API element is subject to removal in a future version. May cause performance issues, deadlocks and hangs.
final Class<? extends Object>	getClass()	Answers the unique instance of java.lang.Class which represents the class of the receiver.
int	hashCode()	Answers an integer hash code for the receiver.
final void	notify()	Causes one thread which is waiting on the receiver to be made ready to run.
final void	notifyAll()	Causes all threads which are waiting on the receiver to be made ready to run.
final void	wait()	Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
final void	wait(long time)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
final void	wait(long time, int frac)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

Constructor Details

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 Details

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:

true if a particular DataFlavor is supported, otherwise false

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.