The
invocationBrowse
event handler is a special user-defined
Function
that can be added to a
JTree
when it is created
and that will be called automatically with a single
InvocationEvent
argument whenever a tree node is about to expand or collapse and
also when a tree node has just expanded or collapsed.
An
invocationBrowse
event handler can only be added via
addEventHandler
after a component is created,
but an existing
invocationBrowse
event handler can be assigned new values.
Assigning
NULL
to
invocationBrowse
disables its functionality until a
NULL
value is assigned to it.
The
InvocationEvent
received by this handler will have the following fields:
| etc |
A field that is not currently used and may not be defined,
but it should be considered reserved for releases.
| | id |
An
Object
that must be an
int
or
String,
that identifies the type of this event.
A value that is a
String
must be the name of an event handler that can process this event.
A value that is an
int
must be a number that the
yoix.event.HandlerID
dictionary associates with an event handler that can process this event.
In practice,
id
is only used when you build an event that gets handed to
postEvent,
and in that case the value assigned to
id
is almost always a
String.
| | type |
An
int
has one of the values
NODE_COLLAPSING,
NODE_COLLAPSED,
NODE_EXPANDING
or
NODE_EXPANDED.
|
When the event handler is called as a node is about to collapse
(i.e., the event has a
type
value of
NODE_COLLAPSING)
or when a node is about to expand
(i.e., the event has a
type
value of
NODE_EXPANDING),
then if this event handler has a return value of zero, the
collapsing or expanding can be stopped before it occurs.
If the handle has no specified return value or the return value is
non-zero, then the expanding or collapsing operation will continue as
expected.
| |
| Return: |
int
or
none
| | |
| See Also: |
actionPerformed,
addEventHandler,
adjustmentValueChanged,
caretUpdate,
componentHidden,
componentMoved,
componentResized,
componentShown,
dragDropEnd,
dragEnter,
dragExit,
dragGestureRecognized,
dragMouseMoved,
dragOver,
drop,
dropActionChanged,
Event,
focusGained,
focusLost,
hyperlinkActivated,
hyperlinkEntered,
hyperlinkExited,
invocationAction,
invocationChange,
invocationEdit,
invocationEditImport,
invocationEditKey,
InvocationEvent,
invocationRun,
invocationSelection,
itemStateChanged,
keyPressed,
keyReleased,
keyTyped,
mouseClicked,
mouseDragged,
mouseEntered,
mouseExited,
mouseMoved,
mousePressed,
mouseReleased,
mouseWheelMoved,
removeEventHandler,
stateChanged,
textValueChanged,
valueChanged,
windowActivated,
windowClosed,
windowClosing,
windowDeactivated,
windowDeiconified,
windowIconified,
windowOpened
|
|
