MACROMEDIA DIRECTOR MX-USING DIRECTOR MX, Руководство пользователя

Страница: 380 / 624

Chapter 15 380
Finding mouse pointer locations with Lingo
Determining where the mouse pointer is on the Stage is a common need in Director.
To determine the mouse pointer’s horizontal and vertical positions:
•
Use the
mouseH()
and
mouseV()
functions. See
mouseH
and
mouseV
in the Lingo Dictionary.
The
mouseV()
function returns the distance, in pixels, between the mouse pointer and the upper
left corner of the Stage. The
mouseH()
function returns the distance, in pixels, between the mouse
pointer and the upper left corner of the Stage.
The statements
put the mouseH
and
put the mouseV
display the mouse pointer’s location in
the Message window.
For example, this handler directs the Message window to display the distance (in pixels) between
the pointer and the upper left corner of the Stage:
on exitFrame
put the mouseH
put the mouseV
go to the frame
end
Checking keys with Lingo
Lingo can detect the last key that the user pressed. See individual properties and functions in the
Lingo Dictionary.
•
To obtain the ANSI value of the last key that was pressed, use the
key()
function.
•
To obtain the keyboard’s numerical (or ASCII) value for the last key pressed, use the
keyCode()
function.
A common place for using
key
and
keyCode
is in an
on keyDown
handler, which instructs
Lingo to check the value of
key
only when a key is actually pressed. For example, the following
handler in a frame script sends the playhead to the next marker whenever the user presses Enter
(Windows) or Return (Macintosh):
on keyDown
if the key = RETURN then go to marker (1)
end
Equivalent cross-platform keys
Because of inherent differences between Windows and Macintosh keyboards, keys on Windows
and Macintosh computers don’t always correspond directly.
This discrepancy can create confusion because Lingo often uses the same term to refer to
corresponding keys on Windows and Macintosh computers, even though the key’s name differs
on the two platforms.
The following table lists Lingo elements that refer to specific keys and the keys they represent on
each platform.
Lingo term Windows key Macintosh key
RETURN Enter Return
commandDown Control Command