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DragGestureEvent (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

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java.awt.dnd
Class DragGestureEvent

java.lang.Object
  |
  +--java.util.EventObject
        |
        +--java.awt.dnd.DragGestureEvent

All Implemented Interfaces:

Serializable

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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.

See Also:

DragGestureRecognizer, DragGestureListener, DragSource, Serialized Form

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Field Summary

 

Fields inherited from class java.util.EventObject

source

 

Constructor Summary

DragGestureEvent(DragGestureRecognizer dgr, int act, Point ori, List evs)           Construct a DragGestureEvent given the DragGestureRecognizer firing this event, an int representing the user's preferred action, a Point indicating the origin of the drag, and a List of events that comprise the gesture.

 

Method Summary
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	iterator()           Returns an Iterator for the events comprising the gesture.
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.
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.
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 evs)

Construct a DragGestureEvent given the DragGestureRecognizer firing this event, an int representing the user's preferred action, a Point indicating the origin of the drag, and a List of events that comprise the gesture.

Parameters:

dgr - The DragGestureRecognizer firing this event

act - The the user's preferred action

ori - The origin of the drag

evs - The List of events that comprise the gesture

Throws:

IllegalArgumentException - if input parameters are null

Method Detail

getSourceAsDragGestureRecognizer

public DragGestureRecognizer getSourceAsDragGestureRecognizer()

Returns the source as a DragGestureRecognizer.

Returns:

the source as a DragGestureRecognizer

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getComponent

public Component getComponent()

Returns the Component associated with this DragGestureEvent.

Returns:

the Component

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getDragSource

public DragSource getDragSource()

Returns the DragSource.

Returns:

the DragSource

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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.

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iterator

public Iterator iterator()

Returns an Iterator for the events comprising the gesture.

Returns:

an Iterator for the events comprising the gesture

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toArray

public Object[] toArray()

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

Returns:

an array of the events comprising the gesture

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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

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getDragAction

public int getDragAction()

Returns an int representing the action selected by the user.

Returns:

the action selected by the user

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getTriggerEvent

public InputEvent getTriggerEvent()

Returns the initial event that triggered the gesture.

Returns:

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

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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 Cursor for this drag operation

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.

InvalidDnDOperationException

Since:

1.4

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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 drag Cursor

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.

InvalidDnDOperationException

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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 drag Cursor

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.

InvalidDnDOperationException

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.