| WindowEvent |
|
typedict |
| |
A
WindowEvent
indicates something important has happened to a component, like a
JFrame
or
Dialog,
that can be displayed as a window on your screen.
The only field in a
WindowEvent
is:
| 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.
|
JDialog,
JFileDialog,
JFrame,
JInternalFrame,
JWindow,
Dialog,
FileDialog,
Frame,
and
Window
are the only components that can receive
WindowEvents,
but they only arrive if the component has defined
one or more of the event handlers listed below.
| |
| Event Handlers: |
windowActivated,
windowClosed,
windowClosing,
windowDeactivated,
windowDeiconified,
windowIconified,
windowOpened
| | |
| Example: |
The program,
import yoix.*.*;
JFrame frame = {
windowOpened(Event e) {
printf("windowOpened: %O\n", e);
}
windowClosed(Event e) {
printf("windowClosed: %O\n", e);
}
};
WindowEvent event = {
String id = "windowClosed";
};
printf("Posting %s\n", event.id);
postEvent(event, frame);
sleep(2);
frame.visible = TRUE;
sleep(2);
frame.visible = FALSE;
sleep(2);
frame.visible = TRUE;
sleep(2);
frame.dispose = TRUE;
sleep(2);
exit(0);
prints
Posting windowClosed
windowClosed: Event[1:0]
>id=202
windowOpened: Event[1:0]
>id=200
windowClosed: Event[1:0]
>id=202
on standard output.
| | |
| See Also: |
ActionEvent,
AdjustmentEvent,
CaretEvent,
ChangeEvent,
ComponentEvent,
DragGestureEvent,
DragSourceEvent,
DropTargetEvent,
Event,
FocusEvent,
HyperlinkEvent,
InvocationEvent,
invokeLater,
isDispatchThread,
ItemEvent,
KeyEvent,
ListSelectionEvent,
MouseEvent,
MouseWheelEvent,
PaintEvent,
postEvent,
TextEvent,
TreeSelectionEvent
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Yoix is a registered trademark of AT&T Inc.
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