MiG InfoCom MiG Calendar AShape Developer Manual - Manual (Page 22)

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the same Component that the AShape itself is painted on.
AShapes in JComponents
Also for this, reversed, use case there exist a special class,
AShapeComponent . It is a JComponent that:
• Forwards InputEvent s ( MouseEvent s and KeyEvent s to
the “wrapped” AShape 's Interactor( s) for processing
before itself handles them (if not consumed).
• Adapts the Swing repaint cycle to migrate to that of the
AShape 's.
• Registers itself to listen for InteractionEvent s on the
AShape and when they occur re-dispatches them to
listeners added to the AShapeComponent .
• Installs the normal types of Interactor s on the wrapped
AShape , if desired.
• Handles the actual JComponent to be positioned relative
to. This means that AShapeComponent can be used as
any type of renderer component, for instance a
Component returned by TableCellRenderer or
TreeCellRenderer . This opens up for having AShape s
in JTree s and JTable s!
Cursors
Mouse cursors is a property of the
Component class. Every
AShape can have a Cursor attribute set on it with the key
AShape.A_MOUSE_CURSOR .
Interactions have to be installed on the AShape s to actually
transfer this set Cursor to the Component on which it is
rendered. It can be done manually but calling
AShapeUtil.enableMouseOverCursor(RootAShape
root)
is the easiest way. It installs Interaction s to set
the Cursor depending of which sub shape the mouse is over.
Since there is no way in Swing to know which is the default
Cursor for a certain point in the Component the cursor can
not be restored when it leaves the shape. You must listen for
MouseEntered events in the Component that is drawing the
AShapes and set the Cursor to the desired one. The
AShape framework will send synthesized MouseEntered and
MouseExited events to the Component when the mouse
exit and enter the hit area of a AShape .
AShape Developer Manual Page 22 / 24
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