MACROMEDIA FLASH 8-LEARNING ACTIONSCRIPT 2.0 IN FLASH, Manual

Page: 636 / 830

636 Working with External Data
Creating a progress bar to display data
loading progress
The following exercise dynamically creates a simple preloader using the Drawing application
programming interface (API) and displays the loading progress for an XML document.
Creating a progress bar using the Drawing API:
1.
Create a new Flash document and save it as drawapi.fla .
2.
Add the following ActionScript to Frame 1 of the main Timeline:
var barWidth:Number = 200;
var barHeight:Number = 6;
this.createEmptyMovieClip("pBar_mc", 9999);
var bar:MovieClip = pBar_mc.createEmptyMovieClip("bar_mc", 10);
bar.beginFill(0xFF0000, 100);
bar.moveTo(0, 0);
bar.lineTo(barWidth, 0);
bar.lineTo(barWidth, barHeight);
bar.lineTo(0, barHeight);
bar.lineTo(0, 0);
bar.endFill();
bar._xscale = 0;
var stroke:MovieClip = pBar_mc.createEmptyMovieClip("stroke_mc", 20);
stroke.lineStyle(0, 0x000000);
stroke.moveTo(0, 0);
stroke.lineTo(barWidth, 0);
stroke.lineTo(barWidth, barHeight);
stroke.lineTo(0, barHeight);
stroke.lineTo(0, 0);
pBar_mc.createTextField("label_txt", 30, 0, barHeight, 100, 21);
pBar_mc.label_txt.autoSize = "left";
pBar_mc.label_txt.selectable = false;
pBar_mc._x = (Stage.width - pBar_mc._width) / 2;
pBar_mc._y = (Stage.height - pBar_mc._height) / 2;
var my_xml:XML = new XML();
my_xml.ignoreWhite = true;
my_xml.onLoad = function(success:Boolean) {
pBar_mc.onEnterFrame = undefined;
if (success) {
trace("XML loaded successfully");
TIP
If the remote XML file loads too quickly to see the preloading effect, try uploading a
larger XML file to the internet and loading that file.