| CaretEvent |
|
typedict |
| |
A
CaretEvent
is a Swing event that indicates a change in one of the positions
(either
dot
or
mark)
associated with the text insertion caret maintained by a Swing
text components like a
JTextArea,
JTextField,
or
JTextPane.
The fields in a
CaretEvent
are:
| dot |
An
int
that represents the insertion point as an index into the text string
currently displayed by the component.
| | 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.
| | mark |
An
int
that represents the mark point as an index into the text string
currently displayed by the component.
|
JTextArea,
JTextField,
and
JTextPane
are the only components that can receive
CaretEvents,
but they only arrive if the component has defined a
caretUpdate
event handler.
| |
| Event Handlers: |
caretUpdate
| | |
| Example: |
The program,
import yoix.*.*;
JFrame f = {
Array layout = {
new JTextArea {
String text = "\n\nNow is the time\nfor all...";
Color background = Color.white;
caretUpdate(Event e) {
printf("caretUpdate: e=%O\n", e);
}
}, CENTER
};
};
f.visible = TRUE;
puts a
JTextArea
in a
JFrame
and defines a handler for
CaretEvents.
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| See Also: |
ActionEvent,
AdjustmentEvent,
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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