This tutorial was written to accompany
and explain the
attached .FLA, authored in Flash
4.
To demonstrate this scroll bar mechanism,
I have included the FLA and SWF of the
FAQ from the Wild FX help system. The scroll
bar is in the question movie clip, on the
left.
There are three basic objects in this scroll
bar mechanism: the content, a mask, and
the scroll bar itself. In addition, there
are two frames of action script in this
movie. The mask is the area of the content
you want visible. The content itself must
be a movie clip named "list" - whether
or not you choose to make this a static,
single-frame movie, or a dynamic, interactive
movie in itself is up to you. The scroll
bar must be a movie named "scroll". Align
everything for a good appearance.
If you wish to use this code
in your own movies, simply copy and paste.
As well, you must specify the values of
four variables in the first frame of the
action layer in the scroll movie:
TargetTop = the center-y-coordinate
of the "list" movie when it is in its top
position TargetBot = the center-y-coordinate
of the "list" movie when it is in its bottom
position BoxTop = the center-y-coordinate
of the "box" movie when it is in its top
position BoxBot = the center-y-coordinate
of the "box" movie when it is in its bottom
position
The easiest way to do this is to select
the "list" or "box" movie, and copy the
y value from the object inspector in Flash.
IMPORTANT: be certain that "use center
point" is checked in the object inspector,
otherwise you will copy incorrect values.
You will also need to adjust the variable "steps".
This is the number of scroll intervals
from the top to the bottom - the longer
the list, the more steps you will want.
If you are using dynamically edited text
fields (or if you are feeling adventurous),
you will need to adapt this code so that
it reads these values automatically. Simply
alter the action script to derive the values
for these variables dynamically, by getting
the y origin and the height of the 'list'
movie. You would also want to define the
variable "steps" as the height of the list
divided by some constant of your choice
(depending on the amount of smoothness
of scrolling you desire).
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code
in your own movies, simply copy and paste.
As well, you must specify the values of
four variables in the first frame of the
action layer in the scroll movie:
