Skip to Main Content
Java Swing, 2nd Edition
book

Java Swing, 2nd Edition

by Dave Wood, Robert Eckstein, Marc Loy, James Elliott, Brian Cole
November 2002
Intermediate to advanced content levelIntermediate to advanced
1278 pages
38h 26m
English
O'Reilly Media, Inc.
Content preview from Java Swing, 2nd Edition

The Drag API

Once you recognize a drag gesture, you can start an actual drag. The drag source receives many of the same types of events as the drop target. Like a drop target, a drag source has a native peer in the form of a DragSourceContext and receives events as the user drags his object over the source and finally drops it on a drop target. As shown in Figure 24-5, the class diagram for the Drag API is similar to that of the Drop API.

Class diagram of DnD’s drag side

Figure 24-5. Class diagram of DnD’s drag side

The DragSource Class

The DragSource class, the flip side of DropTarget, provides support for creating draggable information. Recall from the beginning of this chapter that unlike the DropTarget class, a regular GUI component is not used as a base. Rather, the base component for starting a drag is encapsulated in the DragGestureRecognizer. The recognizer can in turn start a drag for the DragSource. The DragSource class encompasses the context of the drag and provides a focal point for maintaining the visual state of the drag. For example, several predefined cursors that you can use during the drag operation are built into this class.

Properties

The DragSource class has only three properties, two of which are static and apply to the overall DnD system. These properties are shown in Table 24-14.

Table 24-14. DragSource properties

Property

Data type

get

is

set

Default value

defaultDragSources

DragSource

·

   

dragImageSupported ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Java Threads, 3rd Edition

Java Threads, 3rd Edition

Scott Oaks, Henry Wong

Publisher Resources

ISBN: 0596004087Errata PageSupplemental Content