The DesktopManager Interface
This interface is responsible for much of the management of
internal frames contained by JDesktopPanes. It allows an L&F to define exactly how it wants to manage things
such as frame activation, movement, and iconification. Most of the
methods in InternalFrameUI
implementations should delegate to a DesktopManager object. As described earlier,
DesktopManagers are contained by
JDesktopPane objects and are intended
to be set by the L&F. You can also create your own variations on the
supplied implementations to provide custom behavior, as shown in the
example that concludes this chapter.
Methods
The majority of the methods in this interface act on a given
JInternalFrame. However, those
methods that could be applied to other types of components do not
restrict the parameter unnecessarily (they accept any JComponent), despite the fact that they are
typically used only with JInternalFrames. If you implement your own
DesktopManager or other L&F
classes, you may find a need for this flexibility.
- public abstract void activateFrame( JInternalFrame f )
Called to indicate that the specified frame should become active (is gaining focus).
- public abstract void beginDraggingFrame( JComponent f )
Called to indicate that the specified frame is now being dragged. The given component is normally a
JInternalFrame.- public abstract void beginResizingFrame( JComponent f, int direction)
Called to indicate that the specified frame will be resized. The direction comes from
SwingConstants ...