Java Reference
In-Depth Information
canvas.addMouseListener (
new MouseAdapter ()
{
public void mouseClicked (MouseEvent e)
{
if ((e.getModifiers () & InputEvent.BUTTON1
-
MASK)!
=
0)
saySomething (
"
Left button pressed
"
,e);
if ((e.getModifiers () & InputEvent.BUTTON2
-
MASK)!
=
0)
saySomething (
"
Middle button pressed
"
,e);
if ((e.getModifiers () & InputEvent.BUTTON3
-
MASK)!
=
0)
saySomething (
"
Right button3 pressed
"
,e);
if ((e.getModifiers () & InputEvent.ALT
-
MASK)!
=
0)
saySomething (
"
alt pressed
"
,e);
if ((e.getModifiers () & InputEvent.META
-
MASK)!
=
0)
saySomething (
"
meta pressed
"
,e);
}
// mouseClicked
}
// end anonymous class
); // end method call
}
// ctor
/** Indicate what mouse event occurred. **/
void saySomething (String eventDescription, MouseEvent e)
{
fTextArea.append (eventDescription +
"
on
"
+
e.getComponent ().getClass ().getName () +
"\
n
"
);
}
}
// class MouseButtonPanel
12.5 Popup menu
On all common graphical user interfaces a particular mouse button or combination
of a mouse button and key strokes (such as
CTRL
or
ALT
keys) brings up a
popup
menu. A popup menu is a dialog window that appears close to the cursor and
that typically lists a set of operations related to what you clicked on (such as
cut
,
copy
,
insert
,
paste
in an editor).
To provide for platform portability, the AWT provides the
isPopup-
Trigger()
method in the
MouseEvent
class. This method returns a
boolean
value to indicate if the standard button/key combination for a popup menu on a
particular platform was present during a mouse click event. You therefore don't
need to test for the buttons or button/keystroke combinations yourself and, more
importantly, you don't need to know and build in test code for all possible plat-
forms to detect a popup menu request.
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