| TreeSelectionEvent |
|
typedict |
| |
A
TreeSelectionEvent
is a Swing event that indicates the current selection in a
JTree
has changed.
The fields in a
TreeSelectionEvent
are:
| 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.
| | items |
An
Array,
arranged in pairs, that indicate which nodes in the
JTree
were added or removed from the selection.
The first element in a pair is a
JTreeNode
and the second element in the pair is an
int
the is
1
if the node was added and
0
if it was removed from the selection.
|
JTree
is the only component that can receive
TreeSelectionEvents,
but they only arrive if the component has defined a
valueChanged
event handler.
| |
| Event Handlers: |
valueChanged
| | |
| Example: |
The program,
import yoix.*.*;
JFrame f = {
Array layout = {
new JTree {
Color background = Color.white;
JTreeNode top = {
String text = "The C Programming Language";
Array children = {
new JTreeNode {
String text = "Introduction";
},
new JTreeNode {
String text = "A Tutorial Introduction";
},
new JTreeNode {
String text = "Types, Operators and Expressions";
},
};
};
valueChanged(Event e) {
printf("valueChanged: items=%O\n", e.items);
}
}
};
};
f.visible = TRUE;
puts a small
JTree
in a
JFrame
and defines a handler for
TreeSelectionEvents
that dumps the
items
array each time an event arrives.
| | |
| See Also: |
ActionEvent,
AdjustmentEvent,
CaretEvent,
ChangeEvent,
ComponentEvent,
DragGestureEvent,
DragSourceEvent,
DropTargetEvent,
Event,
FocusEvent,
HyperlinkEvent,
InvocationEvent,
invokeLater,
isDispatchThread,
ItemEvent,
KeyEvent,
ListSelectionEvent,
MouseEvent,
MouseWheelEvent,
PaintEvent,
postEvent,
TextEvent,
WindowEvent
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Yoix is a registered trademark of AT&T Intellectual Property.
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