java.lang.Object
- java.awt.dnd.DropTarget

All Implemented Interfaces:

DropTargetListener, Serializable, EventListener
```
public class DropTarget
extends Object
implements DropTargetListener, Serializable
```
The DropTarget is associated with a Component when that Component wishes to accept drops during Drag and Drop operations.
Each DropTarget is associated with a FlavorMap. The default FlavorMap hereafter designates the FlavorMap returned by SystemFlavorMap.getDefaultFlavorMap().

Since:

1.2

See Also:
Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

protected static class DropTarget.DropTargetAutoScroller
this protected nested class implements autoscrolling

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Constructor Summary

Constructors
Constructor and Description
`DropTarget()` Creates a `DropTarget`.
`DropTarget(Component c, DropTargetListener dtl)` Creates a `DropTarget` given the `Component` to associate itself with, and the `DropTargetListener` to handle event processing.
`DropTarget(Component c, int ops, DropTargetListener dtl)` Creates a `DropTarget` given the `Component` to associate itself with, an `int` representing the default acceptable action(s) to support, and a `DropTargetListener` to handle event processing.
`DropTarget(Component c, int ops, DropTargetListener dtl, boolean act)` Creates a `DropTarget` given the `Component` to associate itself with, an `int` representing the default acceptable action(s) to support, a `DropTargetListener` to handle event processing, and a `boolean` indicating if the `DropTarget` is currently accepting drops.
`DropTarget(Component c, int ops, DropTargetListener dtl, boolean act, FlavorMap fm)` Creates a new DropTarget given the `Component` to associate itself with, an `int` representing the default acceptable action(s) to support, a `DropTargetListener` to handle event processing, a `boolean` indicating if the `DropTarget` is currently accepting drops, and a `FlavorMap` to use (or null for the default `FlavorMap`).

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Method Summary

Methods
Modifier and Type	Method and Description
`void`	`addDropTargetListener(DropTargetListener dtl)` Adds a new `DropTargetListener` (UNICAST SOURCE).
`void`	`addNotify(java.awt.peer.ComponentPeer peer)` Notify the DropTarget that it has been associated with a Component This method is usually called from java.awt.Component.addNotify() of the Component associated with this DropTarget to notify the DropTarget that a ComponentPeer has been associated with that Component.
`protected void`	`clearAutoscroll()` clear autoscrolling
`protected DropTarget.DropTargetAutoScroller`	`createDropTargetAutoScroller(Component c, Point p)` create an embedded autoscroller
`protected DropTargetContext`	`createDropTargetContext()` Creates the DropTargetContext associated with this DropTarget.
`void`	`dragEnter(DropTargetDragEvent dtde)` Calls `dragEnter` on the registered `DropTargetListener` and passes it the specified `DropTargetDragEvent`.
`void`	`dragExit(DropTargetEvent dte)` Calls `dragExit` on the registered `DropTargetListener` and passes it the specified `DropTargetEvent`.
`void`	`dragOver(DropTargetDragEvent dtde)` Calls `dragOver` on the registered `DropTargetListener` and passes it the specified `DropTargetDragEvent`.
`void`	`drop(DropTargetDropEvent dtde)` Calls `drop` on the registered `DropTargetListener` and passes it the specified `DropTargetDropEvent` if this `DropTarget` is active.
`void`	`dropActionChanged(DropTargetDragEvent dtde)` Calls `dropActionChanged` on the registered `DropTargetListener` and passes it the specified `DropTargetDragEvent`.
`Component`	`getComponent()` Gets the `Component` associated with this `DropTarget`.
`int`	`getDefaultActions()` Gets an `int` representing the current action(s) supported by this `DropTarget`.
`DropTargetContext`	`getDropTargetContext()` Gets the `DropTargetContext` associated with this `DropTarget`.
`FlavorMap`	`getFlavorMap()` Gets the `FlavorMap` associated with this `DropTarget`.
`protected void`	`initializeAutoscrolling(Point p)` initialize autoscrolling
`boolean`	`isActive()` Reports whether or not this `DropTarget` is currently active (ready to accept drops).
`void`	`removeDropTargetListener(DropTargetListener dtl)` Removes the current `DropTargetListener` (UNICAST SOURCE).
`void`	`removeNotify(java.awt.peer.ComponentPeer peer)` Notify the DropTarget that it has been disassociated from a Component This method is usually called from java.awt.Component.removeNotify() of the Component associated with this DropTarget to notify the DropTarget that a ComponentPeer has been disassociated with that Component.
`void`	`setActive(boolean isActive)` Sets the DropTarget active if `true`, inactive if `false`.
`void`	`setComponent(Component c)` Note: this interface is required to permit the safe association of a DropTarget with a Component in one of two ways, either: `component.setDropTarget(droptarget);` or `droptarget.setComponent(component);`
`void`	`setDefaultActions(int ops)` Sets the default acceptable actions for this `DropTarget`
`void`	`setFlavorMap(FlavorMap fm)` Sets the `FlavorMap` associated with this `DropTarget`.
`protected void`	`updateAutoscroll(Point dragCursorLocn)` update autoscrolling with current cursor locn

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

- Constructor Detail
  - DropTarget
```
public DropTarget(Component c,
          int ops,
          DropTargetListener dtl,
          boolean act,
          FlavorMap fm)
           throws HeadlessException
```
    Creates a new DropTarget given the Component to associate itself with, an int representing the default acceptable action(s) to support, a DropTargetListener to handle event processing, a boolean indicating if the DropTarget is currently accepting drops, and a FlavorMap to use (or null for the default FlavorMap).
    The Component will receive drops only if it is enabled.
    
    Parameters:
    c - The Component with which this DropTarget is associated
    ops - The default acceptable actions for this DropTarget
    dtl - The DropTargetListener for this DropTarget
    act - Is the DropTarget accepting drops.
    fm - The FlavorMap to use, or null for the default FlavorMap
    
    Throws:
    
    HeadlessException - if GraphicsEnvironment.isHeadless() returns true
    See Also:
    GraphicsEnvironment.isHeadless()
  - DropTarget
```
public DropTarget(Component c,
          int ops,
          DropTargetListener dtl,
          boolean act)
           throws HeadlessException
```
    Creates a DropTarget given the Component to associate itself with, an int representing the default acceptable action(s) to support, a DropTargetListener to handle event processing, and a boolean indicating if the DropTarget is currently accepting drops.
    The Component will receive drops only if it is enabled.
    
    Parameters:
    c - The Component with which this DropTarget is associated
    ops - The default acceptable actions for this DropTarget
    dtl - The DropTargetListener for this DropTarget
    act - Is the DropTarget accepting drops.
    
    Throws:
    
    HeadlessException - if GraphicsEnvironment.isHeadless() returns true
    See Also:
    GraphicsEnvironment.isHeadless()
  - DropTarget
```
public DropTarget()
           throws HeadlessException
```
    Creates a DropTarget.
    
    Throws:
    
    HeadlessException - if GraphicsEnvironment.isHeadless() returns true
    See Also:
    GraphicsEnvironment.isHeadless()
  - DropTarget
```
public DropTarget(Component c,
          DropTargetListener dtl)
           throws HeadlessException
```
    Creates a DropTarget given the Component to associate itself with, and the DropTargetListener to handle event processing.
    The Component will receive drops only if it is enabled.
    
    Parameters:
    c - The Component with which this DropTarget is associated
    dtl - The DropTargetListener for this DropTarget
    
    Throws:
    
    HeadlessException - if GraphicsEnvironment.isHeadless() returns true
    See Also:
    GraphicsEnvironment.isHeadless()
  - DropTarget
```
public DropTarget(Component c,
          int ops,
          DropTargetListener dtl)
           throws HeadlessException
```
    Creates a DropTarget given the Component to associate itself with, an int representing the default acceptable action(s) to support, and a DropTargetListener to handle event processing.
    The Component will receive drops only if it is enabled.
    
    Parameters:
    c - The Component with which this DropTarget is associated
    ops - The default acceptable actions for this DropTarget
    dtl - The DropTargetListener for this DropTarget
    
    Throws:
    
    HeadlessException - if GraphicsEnvironment.isHeadless() returns true
    See Also:
    GraphicsEnvironment.isHeadless()
- Method Detail
  - setComponent
```
public void setComponent(Component c)
```
    Note: this interface is required to permit the safe association of a DropTarget with a Component in one of two ways, either: component.setDropTarget(droptarget); or droptarget.setComponent(component);
    The Component will receive drops only if it is enabled.
    
    Parameters:
    c - The new Component this DropTarget is to be associated with.
  - getComponent
```
public Component getComponent()
```
    Gets the Component associated with this DropTarget.
    
    Returns:
    the current Component
  - setDefaultActions
```
public void setDefaultActions(int ops)
```
    Sets the default acceptable actions for this DropTarget
    
    Parameters:
    ops - the default actions
    See Also:
    DnDConstants
  - getDefaultActions
```
public int getDefaultActions()
```
    Gets an int representing the current action(s) supported by this DropTarget.
    
    Returns:
    the current default actions
  - setActive
```
public void setActive(boolean isActive)
```
    Sets the DropTarget active if true, inactive if false.
    
    Parameters:
    isActive - sets the DropTarget (in)active.
  - isActive
```
public boolean isActive()
```
    Reports whether or not this DropTarget is currently active (ready to accept drops).
    
    Returns:
    true if active, false if not
  - addDropTargetListener
```
public void addDropTargetListener(DropTargetListener dtl)
                           throws TooManyListenersException
```
    Adds a new DropTargetListener (UNICAST SOURCE).
    
    Parameters:
    dtl - The new DropTargetListener
    
    Throws:
    
    TooManyListenersException - if a DropTargetListener is already added to this DropTarget.
    
    TooManyListenersException
  - removeDropTargetListener
```
public void removeDropTargetListener(DropTargetListener dtl)
```
    Removes the current DropTargetListener (UNICAST SOURCE).
    
    Parameters:
    dtl - the DropTargetListener to deregister.
  - dragEnter
```
public void dragEnter(DropTargetDragEvent dtde)
```
    Calls dragEnter on the registered DropTargetListener and passes it the specified DropTargetDragEvent. Has no effect if this DropTarget is not active.
    
    Specified by:
    
    dragEnter in interface DropTargetListener
    
    Parameters:
    dtde - the DropTargetDragEvent
    
    Throws:
    
    NullPointerException - if this DropTarget is active and dtde is null
    See Also:
    isActive()
  - dragOver
```
public void dragOver(DropTargetDragEvent dtde)
```
    Calls dragOver on the registered DropTargetListener and passes it the specified DropTargetDragEvent. Has no effect if this DropTarget is not active.
    
    Specified by:
    
    dragOver in interface DropTargetListener
    
    Parameters:
    dtde - the DropTargetDragEvent
    
    Throws:
    
    NullPointerException - if this DropTarget is active and dtde is null
    See Also:
    isActive()
  - dropActionChanged
```
public void dropActionChanged(DropTargetDragEvent dtde)
```
    Calls dropActionChanged on the registered DropTargetListener and passes it the specified DropTargetDragEvent. Has no effect if this DropTarget is not active.
    
    Specified by:
    
    dropActionChanged in interface DropTargetListener
    
    Parameters:
    dtde - the DropTargetDragEvent
    
    Throws:
    
    NullPointerException - if this DropTarget is active and dtde is null
    See Also:
    isActive()
  - dragExit
```
public void dragExit(DropTargetEvent dte)
```
    Calls dragExit on the registered DropTargetListener and passes it the specified DropTargetEvent. Has no effect if this DropTarget is not active.
    This method itself does not throw any exception for null parameter but for exceptions thrown by the respective method of the listener.
    
    Specified by:
    
    dragExit in interface DropTargetListener
    
    Parameters:
    dte - the DropTargetEvent
    See Also:
    isActive()
  - drop
```
public void drop(DropTargetDropEvent dtde)
```
    Calls drop on the registered DropTargetListener and passes it the specified DropTargetDropEvent if this DropTarget is active.
    
    Specified by:
    
    drop in interface DropTargetListener
    
    Parameters:
    dtde - the DropTargetDropEvent
    
    Throws:
    
    NullPointerException - if dtde is null and at least one of the following is true: this DropTarget is not active, or there is no a DropTargetListener registered.
    See Also:
    isActive()
  - getFlavorMap
```
public FlavorMap getFlavorMap()
```
    Gets the FlavorMap associated with this DropTarget. If no FlavorMap has been set for this DropTarget, it is associated with the default FlavorMap.
    
    Returns:
    the FlavorMap for this DropTarget
  - setFlavorMap
```
public void setFlavorMap(FlavorMap fm)
```
    Sets the FlavorMap associated with this DropTarget.
    
    Parameters:
    fm - the new FlavorMap, or null to associate the default FlavorMap with this DropTarget.
  - addNotify
```
public void addNotify(java.awt.peer.ComponentPeer peer)
```
    Notify the DropTarget that it has been associated with a Component This method is usually called from java.awt.Component.addNotify() of the Component associated with this DropTarget to notify the DropTarget that a ComponentPeer has been associated with that Component. Calling this method, other than to notify this DropTarget of the association of the ComponentPeer with the Component may result in a malfunction of the DnD system.
    
    Parameters:
    peer - The Peer of the Component we are associated with!
  - removeNotify
```
public void removeNotify(java.awt.peer.ComponentPeer peer)
```
    Notify the DropTarget that it has been disassociated from a Component This method is usually called from java.awt.Component.removeNotify() of the Component associated with this DropTarget to notify the DropTarget that a ComponentPeer has been disassociated with that Component. Calling this method, other than to notify this DropTarget of the disassociation of the ComponentPeer from the Component may result in a malfunction of the DnD system.
    
    Parameters:
    peer - The Peer of the Component we are being disassociated from!
  - getDropTargetContext
```
public DropTargetContext getDropTargetContext()
```
    Gets the DropTargetContext associated with this DropTarget.
    
    Returns:
    the DropTargetContext associated with this DropTarget.
  - createDropTargetContext
```
protected DropTargetContext createDropTargetContext()
```
    Creates the DropTargetContext associated with this DropTarget. Subclasses may override this method to instantiate their own DropTargetContext subclass. This call is typically *only* called by the platform's DropTargetContextPeer as a drag operation encounters this DropTarget. Accessing the Context while no Drag is current has undefined results.
  - createDropTargetAutoScroller
```
protected DropTarget.DropTargetAutoScroller createDropTargetAutoScroller(Component c,
                                                             Point p)
```
    create an embedded autoscroller
    
    Parameters:
    c - the Component
    p - the Point
  - initializeAutoscrolling
```
protected void initializeAutoscrolling(Point p)
```
    initialize autoscrolling
    
    Parameters:
    p - the Point
  - updateAutoscroll
```
protected void updateAutoscroll(Point dragCursorLocn)
```
    update autoscrolling with current cursor locn
    
    Parameters:
    dragCursorLocn - the Point
  - clearAutoscroll
```
protected void clearAutoscroll()
```
    clear autoscrolling

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Vielen Dank im Voraus.

Dokument erstellt 11/06/2005, zuletzt geändert 04/03/2020
Quelle des gedruckten Dokuments:https://www.gaudry.be/de/java-api-rf-java/awt/dnd/droptarget.html

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Referenzen

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Inhaltsverzeichnis Haut

Class DropTarget

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

DropTarget

DropTarget

DropTarget

DropTarget

DropTarget

Method Detail

setComponent

getComponent

setDefaultActions

getDefaultActions

setActive

isActive

addDropTargetListener

removeDropTargetListener

dragEnter

dragOver

dropActionChanged

dragExit

drop

getFlavorMap

setFlavorMap

addNotify

removeNotify

getDropTargetContext

createDropTargetContext

createDropTargetAutoScroller

initializeAutoscrolling

updateAutoscroll

clearAutoscroll

Referenzen