DropTargetDragEvent (Java Platform SE 8 )
Keywords: java.awt.dnd.DropTargetDragEvent class
Date: 2016-10-23

java.awt.dnd

## Class DropTargetDragEvent

- java.lang.Object
- - java.util.EventObject
  - - java.awt.dnd.DropTargetEvent
    - - 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:
    Serialized Form

- - ### Field Summary

    - ### Fields inherited from class java.awt.dnd.DropTargetEvent

      `context`

    - ### Fields inherited from class java.util.EventObject

      `source`

  - ### Constructor Summary

    Constructors
    Constructor and 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

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and 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 inherited from class java.awt.dnd.DropTargetEvent

      `getDropTargetContext`

    - ### 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

    - #### 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 Detail

    - #### 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 `DataFlavor`s from the `DropTargetContext`.

      Returns:
        current DataFlavors from the DropTargetContext

    - #### getCurrentDataFlavorsAsList

          public List<DataFlavor> getCurrentDataFlavorsAsList()

      This method returns the current `DataFlavor`s as a `java.util.List`

      Returns:
        a `java.util.List` of the Current `DataFlavor`s

    - #### 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:
        if a particular DataFlavor is supported

    - #### 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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