ActionScript for Flash MX: The Definitive Guide, Second Edition

TextField.textWidth Property

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ActionScript Language Reference

Example

The following simplified scrollbar code scales a scrollbar handle in proportion to the

amount of overflow in a text field. Every time the field is scrolled, the code checks the ratio

of

_height to textHeight to determine the scale of the handle. It positions the handle based

on the

scroll and maxscroll properties. To try the code, first make two rectangular movie

clips named

scrollbg and scrollhandle.

// Create a multiline text field

this.createTextField("theField_txt", 1, 0, 0, 150, 40);

theField_txt.border = true;

theField_txt.text = "Line one \nLine two \nLine three \nLine four";

// Allow user input on multiple lines

theField_txt.type = "input";

theField_txt.multiline = true;

// Size the scrollbar background

scrollbg._width = 20;

scrollbg._height = theField_txt._height;

// Position the scrollbar background

scrollbg._x = theField_txt._x + theField_txt._width;

scrollbg._y = theField_txt._y;

// Size and position the scrollbar handle whenever the field is scrolled

theField_txt.onScroller = function () {

// Size the scrollbar handle

scrollhandle._width = 20;

scrollhandle._height = theField_txt._height

* (theField_txt._height / theField_txt.textHeight);

// Position the scrollbar handle

scrollhandle._x = theField_txt._x + theField_txt._width; ...