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package { import flash.display.Sprite; import flash.events.Event; import flash.events.FocusEvent; import flash.text.*; import flash.utils.Dictionary; public class ch17ex9 extends Sprite { protected const INFMT:TextFormat = new TextFormat("_sans", 12, 0, true); protected const OUTFMT:TextFormat = new TextFormat( "_sans", 12, 0x808080, false); protected var prompts:Dictionary; protected var nameTF:TextField; protected var phoneTF:TextField; protected var emailTF:TextField; protected var okButton:Sprite; public function ch17ex9() { prompts = new Dictionary(); nameTF = makeInputTextField(); nameTF.text = "Your name"; nameTF.setTextFormat(OUTFMT); nameTF.maxChars = 40; prompts[nameTF] = nameTF.text; phoneTF = makeInputTextField(); phoneTF.text = "Your phone number"; phoneTF.setTextFormat(OUTFMT); phoneTF.maxChars = 12; phoneTF.restrict = "0-9\\-"; prompts[phoneTF] = phoneTF.text; emailTF = makeInputTextField(); emailTF.text = "Your email address";
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emailTF.setTextFormat(OUTFMT); emailTF.maxChars = 40; emailTF.restrict = "a-zA-Z0-9_\\-+= !@#$%\\^."; prompts[emailTF] = emailTF.text; okButton = makeOkButton(); validate(); } protected function onFocusIn(event:FocusEvent):void { var tf:TextField = TextField(event.target); if (tf.text == prompts[tf]) { tf.text = ""; } tf.setTextFormat(INFMT); tf.defaultTextFormat = INFMT; } protected function onFocusOut(event:FocusEvent):void { var tf:TextField = TextField(event.target); if (tf.text == "") { tf.text = prompts[tf]; tf.setTextFormat(OUTFMT); } } protected function onChange(event:Event):void { validate(); } protected function validate():void { if (isValid) { okButton.alpha = 1; okButton.mouseEnabled = true; } else { okButton.alpha = 0.2; okButton.mouseEnabled = false; } } protected function get isValid():Boolean { if (isEmpty(nameTF)) return false; if (isEmpty(phoneTF) || phoneTF.text.match(/^\d{3}-\d{3}-\d{4}$/) == null) return false; if (isEmpty(emailTF) || emailTF.text.match(/^\w+@\w+\.[a-z]{2,6}$/) == null) return false; //warning, this regex is not industry grade! return true; } protected function isEmpty(tf:TextField):Boolean { return (tf.text.replace(/\s*/, "").length == 0 || tf.text == prompts[tf]); } protected function makeInputTextField():TextField { var tf:TextField = new TextField(); tf.type = TextFieldType.INPUT; tf.border = true; tf.width = 300; continued
Part III: The Display List
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EXAMPLE 17-9
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tf.height = 18; tf.y = numChildren * 26; tf.addEventListener(FocusEvent.FOCUS_IN, onFocusIn); tf.addEventListener(FocusEvent.FOCUS_OUT, onFocusOut); tf.addEventListener(Event.CHANGE, onChange); addChild(tf); return tf; } protected function makeOkButton():Sprite { var w:Number = 100, h:Number = 20; var btn:Sprite = new Sprite(); var label:TextField = new TextField(); label.width = w; label.height = h; label.defaultTextFormat = new TextFormat("_typewriter", 14, 0, true, null, null, null, null, TextFormatAlign.CENTER); label.text = "Submit"; btn.buttonMode = true; btn.mouseChildren = false; btn.addChild(label); btn.graphics.lineStyle(1, 0x202030); btn.graphics.beginFill(0xb0b0b0, 1); btn.graphics.drawRect(0, 0, w, h); btn.graphics.endFill(); btn.y = this.height + 20; addChild(btn); return btn; } } }
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This is the most complete incarnation of the form yet, with real-time validation. You used the change event to revalidate every time the TextFields changed. You also made extensive use of regular expressions, which you learned about in 12, Regular Expressions.
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By listening for the TextEvent.LINK event, you can be noti ed when the user clicks a link in a TextField. If you design the targets of the links in a particular way, you can get data out of each link rather than having them navigate a web browser to a URL. This means you can trigger ActionScript events not just from clicks on TextFields but from clicks on speci c words in a TextField. For example, you could write a simple menu using TextField to lay out all the labels as hyperlinked text, rather than manually adding multiple TextFields with their own individual event listeners. To route a click on an <a> tag through the event ow, set the link to any URI with the event: scheme. This is a virtual scheme used to notify Flash Player that the link should dispatch an event.
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17: Text, Styles, and Fonts
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Any parts of the URI after event: are stored in the event object s text property, so you can determine for yourself how to communicate through links. For example, you could decide to send a method name and arguments in the link by simply separating them by commas, as shown in Example 17-10. EXAMPLE 17-10
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package { import flash.display.Sprite; import flash.events.TextEvent; import flash.text.*; public class ch17ex10 extends Sprite { protected var tf:TextField; public function ch17ex10() { tf = new TextField(); tf.selectable = false; tf.defaultTextFormat = new TextFormat("_sans", 14); tf.multiline = tf.wordWrap = true; tf.width = 200; tf.htmlText = "This text controls itself. You could turn it" + <a href="event:color,0xff0000"><u>red</u></a> or + <a href="event:color,0x00ff00"><u>green</u></a>. Or you could + <a href="event:move,20,0"><u>move it right</u></a> or + <a href="event:move,0,20"><u>move it down</u></a>. ; tf.addEventListener(TextEvent.LINK, onLink); addChild(tf); } protected function onLink(event:TextEvent):void { var args:Array = event.text.split(","); if (args.length < 1) return; switch (args.shift()) { case "color": colorText.apply(this, args); break; case "move": moveText.apply(this, args); break; } } protected function colorText(colorStr:String):void { tf.setTextFormat(new TextFormat(null, null, parseInt(colorStr, 16))); } protected function moveText(xStr:String, yStr:String):void { tf.x += parseFloat(xStr); tf.y += parseFloat(yStr); } } }
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You could use the LINK event to do even crazier things, like store serialized objects (http://bit.ly/store-objects-in-links).
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