DropTargetContext (Java Platform SE 8 )
Keywords: java.awt.dnd.DropTargetContext class
Date: 2015-11-19

java.awt.dnd

## Class DropTargetContext

- java.lang.Object
- - java.awt.dnd.DropTargetContext

- All Implemented Interfaces:
    Serializable

      public class DropTargetContext
      extends Object
      implements Serializable

  A `DropTargetContext` is created whenever the logical cursor associated with a Drag and Drop operation coincides with the visible geometry of a `Component` associated with a `DropTarget`. The `DropTargetContext` provides the mechanism for a potential receiver of a drop operation to both provide the end user with the appropriate drag under feedback, but also to effect the subsequent data transfer if appropriate.
  Since:
    1.2
  See Also:
    Serialized Form

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `protected class` | `DropTargetContext.TransferableProxy` `TransferableProxy` is a helper inner class that implements `Transferable` interface and serves as a proxy for another `Transferable` object which represents data transfer for a particular drag-n-drop operation.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected void` | `acceptDrag(int dragOperation)` accept the Drag.
    `protected void` | `acceptDrop(int dropOperation)` called to signal that the drop is acceptable using the specified operation.
    `void` | `addNotify(java.awt.dnd.peer.DropTargetContextPeer dtcp)` Called when associated with the `DropTargetContextPeer`.
    `protected Transferable` | `createTransferableProxy(Transferable t, boolean local)` Creates a TransferableProxy to proxy for the specified Transferable.
    `void` | `dropComplete(boolean success)` This method signals that the drop is completed and if it was successful or not.
    `Component` | `getComponent()` This method returns the `Component` associated with this `DropTargetContext`.
    `protected DataFlavor[]` | `getCurrentDataFlavors()` get the available DataFlavors of the `Transferable` operand of this operation.
    `protected List<DataFlavor>` | `getCurrentDataFlavorsAsList()` This method returns a the currently available DataFlavors of the `Transferable` operand as a `java.util.List`.
    `DropTarget` | `getDropTarget()` This method returns the `DropTarget` associated with this `DropTargetContext`.
    `protected int` | `getTargetActions()` This method returns an `int` representing the current actions this `DropTarget` will accept.
    `protected Transferable` | `getTransferable()` get the Transferable (proxy) operand of this operation
    `protected boolean` | `isDataFlavorSupported(DataFlavor df)` This method returns a `boolean` indicating if the given `DataFlavor` is supported by this `DropTargetContext`.
    `protected void` | `rejectDrag()` reject the Drag.
    `protected void` | `rejectDrop()` called to signal that the drop is unacceptable.
    `void` | `removeNotify()` Called when disassociated with the `DropTargetContextPeer`.
    `protected void` | `setTargetActions(int actions)` This method sets the current actions acceptable to this `DropTarget`.

    - ### Methods inherited from class java.lang.Object

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

- - ### Method Detail

    - #### getDropTarget

          public DropTarget getDropTarget()

      This method returns the `DropTarget` associated with this `DropTargetContext`.

      Returns:
        the `DropTarget` associated with this `DropTargetContext`

    - #### getComponent

          public Component getComponent()

      This method returns the `Component` associated with this `DropTargetContext`.

      Returns:
        the Component associated with this Context

    - #### addNotify

          public void addNotify(java.awt.dnd.peer.DropTargetContextPeer dtcp)

      Called when associated with the `DropTargetContextPeer`.

      Parameters:
        `dtcp` - the `DropTargetContextPeer`

    - #### removeNotify

          public void removeNotify()

      Called when disassociated with the `DropTargetContextPeer`.

    - #### setTargetActions

          protected void setTargetActions(int actions)

      This method sets the current actions acceptable to this `DropTarget`.

      Parameters:
        `actions` - an `int` representing the supported action(s)

    - #### getTargetActions

          protected int getTargetActions()

      This method returns an `int` representing the current actions this `DropTarget` will accept.

      Returns:
        the current actions acceptable to this `DropTarget`

    - #### dropComplete

          public void dropComplete(boolean success)
                            throws InvalidDnDOperationException

      This method signals that the drop is completed and if it was successful or not.

      Parameters:
        `success` - true for success, false if not

      Throws:
        `InvalidDnDOperationException` - if a drop is not outstanding/extant

    - #### acceptDrag

          protected void acceptDrag(int dragOperation)

      accept the Drag.

      Parameters:
        `dragOperation` - the supported action(s)

    - #### rejectDrag

          protected void rejectDrag()

      reject the Drag.

    - #### acceptDrop

          protected void acceptDrop(int dropOperation)

      called to signal that the drop is acceptable using the specified operation. must be called during DropTargetListener.drop method invocation.

      Parameters:
        `dropOperation` - the supported action(s)

    - #### rejectDrop

          protected void rejectDrop()

      called to signal that the drop is unacceptable. must be called during DropTargetListener.drop method invocation.

    - #### getCurrentDataFlavors

          protected DataFlavor[] getCurrentDataFlavors()

      get the available DataFlavors of the `Transferable` operand of this operation.

      Returns:
        a `DataFlavor[]` containing the supported `DataFlavor`s of the `Transferable` operand.

    - #### getCurrentDataFlavorsAsList

          protected List<DataFlavor> getCurrentDataFlavorsAsList()

      This method returns a the currently available DataFlavors of the `Transferable` operand as a `java.util.List`.

      Returns:
        the currently available DataFlavors as a `java.util.List`

    - #### isDataFlavorSupported

          protected boolean isDataFlavorSupported(DataFlavor df)

      This method returns a `boolean` indicating if the given `DataFlavor` is supported by this `DropTargetContext`.

      Parameters:
        `df` - the `DataFlavor`

      Returns:
        if the `DataFlavor` specified is supported

    - #### getTransferable

          protected Transferable getTransferable()
                                          throws InvalidDnDOperationException

      get the Transferable (proxy) operand of this operation

      Returns:
        the `Transferable`
      Throws:
        `InvalidDnDOperationException` - if a drag is not outstanding/extant

    - #### createTransferableProxy

          protected Transferable createTransferableProxy(Transferable t,
                                                         boolean local)

      Creates a TransferableProxy to proxy for the specified Transferable.
      Parameters:
        `t` - the `Transferable` to be proxied
        `local` - `true` if `t` represents the result of a local drag-n-drop operation.
      Returns:
        the new `TransferableProxy` instance.

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