Java Reference
In-Depth Information
89
90
// handle event when user moves mouse
91
@Override
92
public void
mouseMoved(MouseEvent event)
93
{
94
statusBar.setText(String.format(
"Moved at [%d, %d]"
,
95
event.getX() event.getY()
,
));
96
}
97
}
// end inner class MouseHandler
98
}
// end class MouseTrackerFrame
Fig. 12.28
|
Mouse event handling. (Part 3 of 3.)
1
// Fig. 12.29: MouseTrackerFrame.java
2
// Testing MouseTrackerFrame.
3
import
javax.swing.JFrame;
4
5
public
class
MouseTracker
6
{
7
public
static
void
main(String[] args)
8
{
9
MouseTrackerFrame mouseTrackerFrame =
new
MouseTrackerFrame();
10
mouseTrackerFrame.setDefaultCloseOperation(
JFrame.EXIT_ON_CLOSE
);
11
mouseTrackerFrame.setSize(
300
,
100
);
12
mouseTrackerFrame.setVisible(
true
);
13
}
14
}
// end class MouseTracker
Fig. 12.29
|
Testing
MouseTrackerFrame
.
Line 23 creates
JPanel
mousePanel
. This
JPanel
's mouse events aretracked by the app.
Line 24 sets
mousePanel
's background color to white. When the user moves the mouse into
the
mousePanel
, the application will change
mousePanel
's background color to green. When
the user moves the mouse out of the
mousePanel
, the application will change the background
color back to white. Line 25 attaches
mousePanel
to the
JFrame
. As you've learned, you typ-
ically must specify the layout of the GUI components in a
JFrame
. In that section, we intro-
