| AdjustmentEvent |
|
typedict |
| |
An
AdjustmentEvent
is a low level event generated by a scrollbar that indicates its value has changed.
The AWT and Swing components that can currently receive
AdjustmentEvents
include
JList,
JScrollBar,
JScrollPane,
JTable,
JTextArea,
JTextPane.
Scrollbar,
and
ScrollPane.
The fields in an
AdjustmentEvent
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.
| | orientation |
An
int
that indicates the orientation of the scrollbar that is responsible for the event.
This field was added so an
adjustmentValueChanged
event handler defined in a
JList,
JScrollPane,
JTable,
JTextArea,
JTextPane.
or
ScrollPane
can figure out which scrollbar triggered the event.
| | type |
An
int
that indicates the kind of adjustment that was made to the scrollbar.
The value should be one of
BLOCK_DECREMENT,
BLOCK_INCREMENT,
TRACK,
UNIT_DECREMENT,
or
UNIT_INCREMENT,
which are all defined in
yoix.awt
and
yoix.swing.
| | value |
An
int
that represents the new value of the scrollbar.
|
JScrollBar
and
Scrollbar
are the only components that can receive
AdjustmentEvents,
but they only arrive if the component has defined an
adjustmentValueChanged
event handler.
| |
| Event Handlers: |
adjustmentValueChanged
| | |
| Example: |
The program,
import yoix.*.*;
VM.exitmodel = 0; // so main thread does not exit
JScrollBar scrollbar = {
adjustmentValueChanged(Event e) {
printf("Received: %O\n", e);
exit(0);
}
};
AdjustmentEvent event = {
String id = "adjustmentValueChanged";
int type = BLOCK_INCREMENT;
int value = 23;
};
printf("Posting: %O\n", event);
postEvent(event, scrollbar);
prints
Posting: Event[3:0]
id=^"adjustmentValueChanged"
>type=4
value=23
Received: Event[3:0]
id=601
>type=4
value=23
on standard output.
Notice how the
id
field changed from a string to the corresponding
integer by the time
adjustmentValueChanged
got the event.
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| See Also: |
ActionEvent,
CaretEvent,
ChangeEvent,
ComponentEvent,
DragGestureEvent,
DragSourceEvent,
DropTargetEvent,
Event,
FocusEvent,
HyperlinkEvent,
InvocationEvent,
invokeLater,
isDispatchThread,
ItemEvent,
KeyEvent,
ListSelectionEvent,
MouseEvent,
MouseWheelEvent,
PaintEvent,
postEvent,
TextEvent,
TreeSelectionEvent,
WindowEvent
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Yoix is a registered trademark of AT&T Inc.
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