Module java.desktop

Package java.awt.dnd

Class DragGestureEvent

java.lang.Object

java.util.EventObject

java.awt.dnd.DragGestureEvent

All Implemented Interfaces:

Serializable

public class DragGestureEvent
extends EventObject

A DragGestureEvent is passed to DragGestureListener's dragGestureRecognized() method when a particular DragGestureRecognizer detects that a platform dependent drag initiating gesture has occurred on the Component that it is tracking. The action field of any DragGestureEvent instance should take one of the following values:

• DnDConstants.ACTION_COPY
• DnDConstants.ACTION_MOVE
• DnDConstants.ACTION_LINK

Assigning the value different from listed above will cause an unspecified behavior.

See Also:

DragGestureRecognizer, DragGestureListener, DragSource, DnDConstants, Serialized Form

Field Summary

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor	Description
DragGestureEvent(DragGestureRecognizer dgr, int act, Point ori, List<? extends InputEvent> evs)	Constructs a DragGestureEvent object given by the DragGestureRecognizer instance firing this event, an act parameter representing the user's preferred action, an ori parameter indicating the origin of the drag, and a List of events that comprise the gesture(evs parameter).

Method Summary

Modifier and Type	Method	Description
Component	getComponent()	Returns the Component associated with this DragGestureEvent.
int	getDragAction()	Returns an int representing the action selected by the user.
Point	getDragOrigin()	Returns a Point in the coordinates of the Component over which the drag originated.
DragSource	getDragSource()	Returns the DragSource.
DragGestureRecognizer	getSourceAsDragGestureRecognizer()	Returns the source as a DragGestureRecognizer.
InputEvent	getTriggerEvent()	Returns the initial event that triggered the gesture.
Iterator<InputEvent>	iterator()	Returns an Iterator for the events comprising the gesture.
void	startDrag(Cursor dragCursor, Transferable transferable)	Starts the drag operation given the Cursor for this drag operation and the Transferable representing the source data for this drag operation.
void	startDrag(Cursor dragCursor, Transferable transferable, DragSourceListener dsl)	Starts the drag given the initial Cursor to display, the Transferable object, and the DragSourceListener to use.
void	startDrag(Cursor dragCursor, Image dragImage, Point imageOffset, Transferable transferable, DragSourceListener dsl)	Start the drag given the initial Cursor to display, a drag Image, the offset of the Image, the Transferable object, and the DragSourceListener to use.
Object[]	toArray()	Returns an Object array of the events comprising the drag gesture.
Object[]	toArray(Object[] array)	Returns an array of the events comprising the drag gesture.

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

DragGestureEvent

public DragGestureEvent(DragGestureRecognizer dgr,
                        int act,
                        Point ori,
                        List<? extends InputEvent> evs)

Constructs a DragGestureEvent object given by the DragGestureRecognizer instance firing this event, an act parameter representing the user's preferred action, an ori parameter indicating the origin of the drag, and a List of events that comprise the gesture(evs parameter).

Parameters:

dgr - The DragGestureRecognizer firing this event

act - The user's preferred action. For information on allowable values, see the class description for DragGestureEvent

ori - The origin of the drag

evs - The List of events that comprise the gesture

Throws:

IllegalArgumentException - if any parameter equals null

IllegalArgumentException - if the act parameter does not comply with the values given in the class description for DragGestureEvent

See Also:

DnDConstants

Method Detail

getSourceAsDragGestureRecognizer

public DragGestureRecognizer getSourceAsDragGestureRecognizer()

Returns the source as a DragGestureRecognizer.

Returns:

the source as a DragGestureRecognizer

getComponent

public Component getComponent()

Returns the Component associated with this DragGestureEvent.

Returns:

the Component

getDragSource

public DragSource getDragSource()

Returns the DragSource.

Returns:

the DragSource

getDragOrigin

public Point getDragOrigin()

Returns a Point in the coordinates of the Component over which the drag originated.

Returns:

the Point where the drag originated in Component coords.

iterator

public Iterator<InputEvent> iterator()

Returns an Iterator for the events comprising the gesture.

Returns:

an Iterator for the events comprising the gesture

toArray

public Object[] toArray()

Returns an Object array of the events comprising the drag gesture.

Returns:

an array of the events comprising the gesture

toArray

public Object[] toArray(Object[] array)

Returns an array of the events comprising the drag gesture.

Parameters:

array - the array of EventObject sub(types)

Returns:

an array of the events comprising the gesture

getDragAction

public int getDragAction()

Returns an int representing the action selected by the user.

Returns:

the action selected by the user

getTriggerEvent

public InputEvent getTriggerEvent()

Returns the initial event that triggered the gesture.

Returns:

the first "triggering" event in the sequence of the gesture

startDrag

public void startDrag(Cursor dragCursor,
                      Transferable transferable)
               throws InvalidDnDOperationException

Starts the drag operation given the Cursor for this drag operation and the Transferable representing the source data for this drag operation.
If a null Cursor is specified no exception will be thrown and default drag cursors will be used instead.
If a null Transferable is specified NullPointerException will be thrown.

Parameters:

dragCursor - The initial Cursor for this drag operation or null for the default cursor handling; see DragSourceContext for more details on the cursor handling mechanism during drag and drop

transferable - The Transferable representing the source data for this drag operation.

Throws:

InvalidDnDOperationException - if the Drag and Drop system is unable to initiate a drag operation, or if the user attempts to start a drag while an existing drag operation is still executing.

NullPointerException - if the Transferable is null

Since:

1.4

startDrag

public void startDrag(Cursor dragCursor,
                      Transferable transferable,
                      DragSourceListener dsl)
               throws InvalidDnDOperationException

Starts the drag given the initial Cursor to display, the Transferable object, and the DragSourceListener to use.

Parameters:

dragCursor - The initial Cursor for this drag operation or null for the default cursor handling; see DragSourceContext for more details on the cursor handling mechanism during drag and drop

transferable - The source's Transferable

dsl - The source's DragSourceListener

Throws:

InvalidDnDOperationException - if the Drag and Drop system is unable to initiate a drag operation, or if the user attempts to start a drag while an existing drag operation is still executing.

startDrag

public void startDrag(Cursor dragCursor,
                      Image dragImage,
                      Point imageOffset,
                      Transferable transferable,
                      DragSourceListener dsl)
               throws InvalidDnDOperationException

Start the drag given the initial Cursor to display, a drag Image, the offset of the Image, the Transferable object, and the DragSourceListener to use.

Parameters:

dragCursor - The initial Cursor for this drag operation or null for the default cursor handling; see DragSourceContext for more details on the cursor handling mechanism during drag and drop

dragImage - The source's dragImage

imageOffset - The dragImage's offset

transferable - The source's Transferable

dsl - The source's DragSourceListener

Throws:

InvalidDnDOperationException - if the Drag and Drop system is unable to initiate a drag operation, or if the user attempts to start a drag while an existing drag operation is still executing.