Class DropTargetDragEvent

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:

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

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 `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 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()`	Creates and returns a copy of this object.
`boolean`	`equals(Object obj)`	Indicates whether some other object is "equal to" this one.
`protected void`	`finalize()`	Deprecated, for removal: This API element is subject to removal in a future version. Finalization is deprecated and subject to removal in a future release.
`final Class<?>`	`getClass()`	Returns the runtime class of this `Object`.
`int`	`hashCode()`	Returns a hash code value for this object.
`final void`	`notify()`	Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()`	Wakes up all threads that are waiting on this object's monitor.
`final void`	`wait()`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
`final void`	`wait(long timeoutMillis)`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis, int nanos)`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

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.

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