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Java™ Platform Standard Ed. 6 |
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See:
Description
Interface Summary | |
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Autoscroll | During DnD operations it is possible that a user may wish to drop the subject of the operation on a region of a scrollable GUI control that is not currently visible to the user. |
DragGestureListener | This interface is sourced from a DragGestureRecognizer
and is invoked
when an object of that (sub)class detects a drag initiating
gesture. |
DragSourceListener | The DragSourceListener defines the
event interface for originators of
Drag and Drop operations to track the state of the user's gesture, and to
provide appropriate "drag over"
feedback to the user throughout the
Drag and Drop operation. |
DragSourceMotionListener | A listener interface for receiving mouse motion events during a drag operation. |
DropTargetListener | The DropTargetListener interface
is the callback interface used by the
DropTarget class to provide
notification of DnD operations that involve
the subject DropTarget . |
Class Summary | |
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DnDConstants | This class contains constant values representing the type of action(s) to be performed by a Drag and Drop operation. |
DragGestureEvent | 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. |
DragGestureRecognizer | The DragGestureRecognizer is an
abstract base class for the specification
of a platform-dependent listener that can be associated with a particular
Component in order to
identify platform-dependent drag initiating gestures. |
DragSource | The DragSource is the entity responsible
for the initiation of the Drag
and Drop operation, and may be used in a number of scenarios:
1 default instance per JVM for the lifetime of that JVM. |
DragSourceAdapter | An abstract adapter class for receiving drag source events. |
DragSourceContext | The DragSourceContext class is responsible for managing the
initiator side of the Drag and Drop protocol. |
DragSourceDragEvent | The DragSourceDragEvent is
delivered from the DragSourceContextPeer ,
via the DragSourceContext , to the DragSourceListener
registered with that DragSourceContext and with its associated
DragSource . |
DragSourceDropEvent | The DragSourceDropEvent is delivered
from the DragSourceContextPeer ,
via the DragSourceContext , to the dragDropEnd
method of DragSourceListener s registered with that
DragSourceContext and with its associated
DragSource . |
DragSourceEvent | This class is the base class for
DragSourceDragEvent and
DragSourceDropEvent . |
DropTarget | The DropTarget is associated
with a Component when that Component
wishes
to accept drops during Drag and Drop operations. |
DropTarget.DropTargetAutoScroller | this protected nested class implements autoscrolling |
DropTargetAdapter | An abstract adapter class for receiving drop target events. |
DropTargetContext | 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 . |
DropTargetDragEvent | The DropTargetDragEvent is delivered to a
DropTargetListener via its
dragEnter() and dragOver() methods. |
DropTargetDropEvent | The DropTargetDropEvent is delivered
via the DropTargetListener drop() method. |
DropTargetEvent | The DropTargetEvent is the base
class for both the DropTargetDragEvent
and the DropTargetDropEvent . |
MouseDragGestureRecognizer | This abstract subclass of DragGestureRecognizer
defines a DragGestureRecognizer
for mouse-based gestures. |
Exception Summary | |
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InvalidDnDOperationException | This exception is thrown by various methods in the java.awt.dnd package. |
Drag and Drop is a direct manipulation gesture found in many Graphical User Interface systems that provides a mechanism to transfer information between two entities logically associated with presentation elements in the GUI. Normally driven by a physical gesture of a human user using an appropriate input device, Drag and Drop provides both a mechanism to enable continuous feedback regarding the possible outcome of any subsequent data transfer to the user during navigation over the presentation elements in the GUI, and the facilities to provide for any subsequent data negotiation and transfer.
This package defines the classes and interfaces necessary to perform Drag and Drop operations in Java. It defines classes for the drag-source and the drop-target, as well as events for transferring the data being dragged. This package also provides a means for giving visual feedback to the user throughout the duration of the Drag and Drop operation.
A typical Drag and Drop operation can be decomposed into the following states (not entirely sequentially):
DragSource
comes into existence,
associated with some presentation
element (Component
) in the GUI, to initiate a Drag and Drop of
some potentially Transferable
data.
DropTarget
(s) come into/go out of
existence, associated
with presentation elements in the GUI (Components), potentially
capable of consuming Transferable
data types.
DragGestureRecognizer
is
obtained from the DragSource
and is
associated with a Component
in order
to track and identify any Drag
initiating gesture by the user over the Component
.
Component
,
which the registered
DragGestureRecognizer
detects, and notifies its
DragGestureListener
of.
Note: Although this API consistently refers to the stimulus for a
drag and drop operation being a physical gesture by a human user, this
does not preclude a programmatically driven DnD operation given the
appropriate implementation of a DragSource
. This package
contains the abstract class MouseDragGestureRecognizer
for
recognizing mouse device gestures. Other abstract subclasses may be
provided by the platform to support other input devices or
particular Component
class semantics.
DragGestureListener
causes the
DragSource
to initiate the Drag
and Drop operation on behalf of the user, perhaps animating the
GUI Cursor and/or rendering an Image
of the item(s) that are the
subject of the operation.
Component
(s)
in the GUI with
associated DropTarget
(s), the DragSource
receives notifications in order
to provide "Drag Over" feedback effects, and the DropTarget
(s)
receive notifications in order to provide "Drag Under" feedback effects
based upon the operation(s) supported and the data type(s) involved.
The gesture itself moves a logical cursor across the GUI hierarchy,
intersecting the geometry of GUI Component(s), possibly resulting in
the logical "Drag" cursor entering, crossing, and subsequently
leaving Component
(s) and associated DropTarget
(s).
The DragSource
object manifests "Drag Over" feedback to the user, in the typical case by animating the GUI Cursor
associated with the
logical cursor.
DropTarget
objects manifest "Drag Under" feedback to the user, in
the typical case, by rendering animations into their associated GUI
Component
(s) under the GUI Cursor.
The determination of the feedback effects, and the ultimate success or failure of the data transfer, should one occur, is parameterized as follows:
DragSource
and DropTarget
: Copy, Move or Reference(link).
DragSource
and the set of data types comprehensible by the
DropTarget
.
DragSource
and DropTarget
receive
notifications that include, and result in the type negotiation and
transfer of, the information associated with the DragSource
via a
Transferable
object.
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Java™ Platform Standard Ed. 6 |
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