Smooth Scrollbar

Here's an example of the smooth scrollbar:

1. Make a new 200×250 flash document.

2. Go to: Insert->New Symbol->Movie Clip, and name it button.

Again, go to: Insert->New Symbol->Movie Clip, and name it txthld.

Once more, go to: Insert->New Symbol->Movie Clip, and name it mask.

And for the last time, go to: Insert->New Symbol->Movie Clip, and name it container.

Now, in the library, you should have four movie clips:

library should look like this

3. Double click on the button movie clip.

Now, using the rectanlge tool, draw a rectanlge. (this will be the scrollbar's button)

Then with the align tool, align the rectangle to the center, then align the rectanlge's top edge to the movie clip's center:

use these two buttons

4. Now, double click on the movie clip that you named: txthld.

In this movie clip, you'll put the content you want to scroll.

note: please make sure you center it. with the Align tool:

use these two buttons

Once the Dynamic textfield is correctly centered, make sure you set its Line Type to: Multiline, and give it "mc2" for its instance name

Set the line type to multiline

5. In the library, double click on the movie clip you named container, then drag&drop the movie clip button, in to it.

Place the movie clip button to the top-right corner:

Align button

And give it the instance name: button:

button as its instance name

Add this following Actionscript to the movie clip button

onClipEvent (load) {
_parent.mc2.mc2.autoSize = true;
//so that the textbox autoresize itself
_parent.mc2.mc2._y = -_parent.mc2.mc2._height/2;
//once the textbox autoresized itself this will replace it on the center
this._x = Math.round(this._x);
//this roundup the position of the button on the x-axis. Thanks Chris!
a = this._x;
b = this._y;
}
on (press) {
this.startDrag(false, a, b, a, _parent.mask._height-this._height);
//when pressed, the button can be draged in the mask
}
on (release) {
this.stopDrag();
}
// These following lines are just to make sure IE don't bug
on (releaseOutside) {
this.stopDrag();
}

6. Now drag and drop the Movie Clip txthld

First align it horizontally, so that txthld is next to the scrolling button:

align it

Then give the movie clip: mc2 as its instance name:

mc2 as its instance name

7. Now, add this Action script to the first frame of the container movie clip:

speed = .7;
mc2.setMask(mask);
//sets the mask
createEmptyMovieClip("mc1", this.getNextHighestDepth());
//creates an empty movie clip
setInterval(smoothscroll, 40);
function smoothscroll() {
mc1._y = speed*(mc1._y-(button._y+mc1._y* (button._height/mask._height)))+ (button._y+mc1._y* (button._height/mask._height));
mc2._y = (1-mc2._height/mask._height) *mc1._y+mc2._height/2;
}

Your timeline should look something like this:

8. Now the last step.

Double click on the movie clip "mask", draw a rectangle (of any size you want) with the rectangle tool.

Double click on the movie clip "container", and drag&drop the mc "mask" into it.

Give it "mask" as its instance name:

instance name

Align the mc "mask"'s top edge with the align tool:

Align

Lastely, with the Free Transform Tool, resize the mc "mask", so that the mc "mask" covers the area you want the text to appear

free transform tool