在TWaver Flex中实现垂直文字布局

最近有客户提到如何让Network上网元的标签垂直显示，首先想到的就是每个字符之间插入一个回车。这个用Network#labelFunction就能达到目的：

network.labelFunction = function (element:IElement):String {
	var name:String = element.name;
	if(element.getClient('vertical')) {
		var result:String = '';
		for(var i:int=0,n:int=name.length; i<n; i++) {
			result += name.charAt(i) + 'n';
		}
		result = result.substr(0,result.length-1);
		return result;
	} else {
		return name;
	}
};

来段代码测试看看：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
				xmlns:twaver="http://www.servasoftware.com/2009/twaver/flex"
				layout="absolute" width="100%" height="100%"
				creationComplete="init()" backgroundColor="#FFFFFF" >
	<mx:Script>
		<![CDATA[
			import twaver.Consts;
			import twaver.ElementBox;
			import twaver.IElement;
			import twaver.Node;
			import twaver.Styles;

			private var box:ElementBox = new ElementBox();

			private function init():void {
				network.labelFunction = function (element:IElement):String {
					var name:String = element.name;
					if(element.getClient('vertical')) {
						var result:String = '';
						for(var i:int=0,n:int=name.length; i<n; i++) {
							result += name.charAt(i) + 'n';
						}
						result = result.substr(0,result.length-1);
						return result;
					} else {
						return name;
					}
				};

				var node1:Node = new Node();
				node1.location = new Point(100,100);
				node1.setStyle(Styles.LABEL_POSITION,Consts.POSITION_LEFT_LEFT);
				node1.setClient('vertical',true);
				node1.name = '竖向文字Vertical Text';
				box.add(node1);

				network.elementBox = box;
			}
		]]>
	</mx:Script>
	<twaver:Network id="network" width="100%" height="100%" />
</mx:Application>

运行效果如下：

?

上面的方法很容易让文字垂直显示，但效果不是很理想，中英文混合时，英文也被一个字母一个字母地分开了。有没有更好的方案？答案是肯定的，借助于Flex的Flash Text Engine (FTE)和Text Layout Framework (TLF)，可以很容易的让文字从上到下显示。
先来看看一个小例子，设置TextLayoutFormat的blockProgression属性为BlockProgression.RL即可：

package {
	import flash.display.Sprite;

	import flashx.textLayout.container.ContainerController;
	import flashx.textLayout.conversion.TextConverter;
	import flashx.textLayout.elements.TextFlow;
	import flashx.textLayout.formats.BlockProgression;
	import flashx.textLayout.formats.TextLayoutFormat;

	public class StaticHelloWorld extends Sprite {
		public function StaticHelloWorld() {
			var textLayoutFormat:TextLayoutFormat = new TextLayoutFormat();
			textLayoutFormat.lineHeight = 30;
			textLayoutFormat.locale = 'zh';
			textLayoutFormat.blockProgression = BlockProgression.RL;

			var text:String = "测试竖向文字，再看看English如何？";
			var textFlow:TextFlow = TextConverter.importToFlow(text,TextConverter.PLAIN_TEXT_FORMAT);
			textFlow.hostFormat = textLayoutFormat;
			textFlow.flowComposer.addController(new ContainerController(this,25,200));
			textFlow.flowComposer.updateAllControllers();
		}
	}
}

运行效果如下：

的确这样效果就好多了，英文不会被一个字母一个字母地打断，然后我们自定义一个Attachment：

package {
	import flash.display.Sprite;
	import flash.text.engine.FontPosture;
	import flash.text.engine.FontWeight;

	import flashx.textLayout.container.ContainerController;
	import flashx.textLayout.elements.ParagraphElement;
	import flashx.textLayout.elements.SpanElement;
	import flashx.textLayout.elements.TextFlow;
	import flashx.textLayout.formats.BlockProgression;
	import flashx.textLayout.formats.TextDecoration;
	import flashx.textLayout.formats.TextLayoutFormat;

	import twaver.Styles;
	import twaver.network.ui.BasicAttachment;
	import twaver.network.ui.ElementUI;

	public class FTELabelAttachment extends BasicAttachment {

		private var textLayoutFormat:TextLayoutFormat = new TextLayoutFormat();

		public function FTELabelAttachment(elementUI:ElementUI,showInAttachmentCanvas:Boolean=false) {
			super(elementUI,showInAttachmentCanvas);

			this.textLayoutFormat.locale = 'zh';
			this.textLayoutFormat.blockProgression = BlockProgression.RL;
		}

		override public function updateProperties():void {
			super.updateProperties();

			this.textLayoutFormat.fontFamily = element.getStyle(Styles.LABEL_FONT);
			this.textLayoutFormat.color = element.getStyle(Styles.LABEL_COLOR);
			this.textLayoutFormat.fontSize = element.getStyle(Styles.LABEL_SIZE);
			this.textLayoutFormat.fontStyle = element.getStyle(Styles.LABEL_ITALIC) ? FontPosture.ITALIC : FontPosture.NORMAL;
			this.textLayoutFormat.fontWeight = element.getStyle(Styles.LABEL_BOLD) ? FontWeight.BOLD : FontWeight.NORMAL;
			this.textLayoutFormat.textDecoration = element.getStyle(Styles.LABEL_UNDERLINE ? TextDecoration.UNDERLINE : TextDecoration.NONE);

			var textFlow:TextFlow = new TextFlow();
			textFlow.hostFormat = this.textLayoutFormat;
			var p:ParagraphElement = new ParagraphElement();
			textFlow.addChild(p);
			var span:SpanElement = new SpanElement();
			span.text = network.getLabel(element);
			p.addChild(span);

			var fteLabel:Sprite = new Sprite();
			this.content = fteLabel;
			var containerController:ContainerController = new ContainerController(fteLabel,this.textLayoutFormat.fontSize,1000);
			textFlow.flowComposer.addController(containerController);
			textFlow.flowComposer.updateAllControllers();
		}

		override public function get position():String {
			return element.getStyle(Styles.LABEL_POSITION);
		}

		override public function get xOffset():Number {
			return element.getStyle(Styles.LABEL_XOFFSET);
		}

		override public function get yOffset():Number {
			return element.getStyle(Styles.LABEL_YOFFSET);
		}

		override public function get padding():Number {
			return element.getStyle(Styles.LABEL_PADDING);
		}

		override public function get paddingLeft():Number {
			return element.getStyle(Styles.LABEL_PADDING_LEFT);
		}

		override public function get paddingRight():Number {
			return element.getStyle(Styles.LABEL_PADDING_RIGHT);
		}

		override public function get paddingTop():Number {
			return element.getStyle(Styles.LABEL_PADDING_TOP);
		}

		override public function get paddingBottom():Number {
			return element.getStyle(Styles.LABEL_PADDING_BOTTOM);
		}

		override public function get cornerRadius():Number {
			return element.getStyle(Styles.LABEL_CORNER_RADIUS);
		}

		override public function get pointerLength():Number {
			return element.getStyle(Styles.LABEL_POINTER_LENGTH);
		}

		override public function get pointerWidth():Number {
			return element.getStyle(Styles.LABEL_POINTER_WIDTH);
		}

		override public function get direction():String {
			return element.getStyle(Styles.LABEL_DIRECTION);
		}

		override public function get fill():Boolean {
			return element.getStyle(Styles.LABEL_FILL);
		}

		override public function get fillColor():Number {
			return element.getStyle(Styles.LABEL_FILL_COLOR);
		}

		override public function get fillAlpha():Number {
			return element.getStyle(Styles.LABEL_FILL_ALPHA);
		}

		override public function get gradient():String {
			return element.getStyle(Styles.LABEL_GRADIENT);
		}

		override public function get gradientColor():Number {
			return element.getStyle(Styles.LABEL_GRADIENT_COLOR);
		}

		override public function get gradientAlpha():Number {
			return element.getStyle(Styles.LABEL_GRADIENT_ALPHA);
		}

		override public function get contentXScale():Number {
			return element.getStyle(Styles.LABEL_CONTENT_XSCALE);
		}

		override public function get contentYScale():Number {
			return element.getStyle(Styles.LABEL_CONTENT_YSCALE);
		}

		override public function get outlineWidth():Number {
			return element.getStyle(Styles.LABEL_OUTLINE_WIDTH);
		}

		override public function get outlineColor():Number {
			return element.getStyle(Styles.LABEL_OUTLINE_COLOR);
		}

		override public function get outlineAlpha():Number {
			return element.getStyle(Styles.LABEL_OUTLINE_ALPHA);
		}
	}
}

?

再自定义Node和NodeUI，使用这个Attachment代替TWaver自带的LabelAttachment：
自定义Node：

package {
	import twaver.Node;

	public class FTELabelNode extends Node {
		public function FTELabelNode(id:Object=null) {
			super(id);
		}

		public override function get elementUIClass():Class {
			return FTELabelNodeUI;
		}
	}
}

自定义NodeUI：

package {
	import twaver.Node;
	import twaver.network.Network;
	import twaver.network.ui.NodeUI;

	public class FTELabelNodeUI extends NodeUI {

		private var _labelAttachment:FTELabelAttachment = null;

		public function FTELabelNodeUI(network:Network,node:Node) {
			super(network,node);
		}

		override protected function checkLabelAttachment():void{
			var label:String = this.network.getLabel(element);
			if(label != null && label != ""){
				if(this._labelAttachment == null){
					this._labelAttachment = new FTELabelAttachment(this,false);
					this.addAttachment(this._labelAttachment);
				}
			}else{
				if(this._labelAttachment != null){
					this.removeAttachment(this._labelAttachment);
					this._labelAttachment = null;
				}
			}
		}
	}
}

最后，写个例子看看效果：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
				xmlns:twaver="http://www.servasoftware.com/2009/twaver/flex"
				layout="absolute" width="100%" height="100%"
				creationComplete="init()" backgroundColor="#FFFFFF" >
	<mx:Script>
		<![CDATA[
			import twaver.Consts;
			import twaver.ElementBox;
			import twaver.IElement;
			import twaver.Node;
			import twaver.Styles;

			private var box:ElementBox = new ElementBox();

			private function init():void {
				network.labelFunction = function (element:IElement):String {
					var name:String = element.name;
					if(element.getClient('vertical')) {
						var result:String = '';
						for(var i:int=0,true);
				node1.name = '竖向文字Vertical Text';
				box.add(node1);

				var node2:Node = new FTELabelNode();
				node2.location = new Point(300,100);
				node2.setStyle(Styles.LABEL_POSITION,Consts.POSITION_LEFT_LEFT);
				node2.name = '竖向文字Vertical Text';
				box.add(node2);

				network.elementBox = box;
			}

			private function changeFontSize():void {
				box.forEach(function (element:IElement):void {
					element.setStyle(Styles.LABEL_SIZE,element.getStyle(Styles.LABEL_SIZE) + 2);
				});
			}
		]]>
	</mx:Script>
	<mx:VBox width="100%" height="100%">
		<mx:HBox width="100%" height="20">
			<mx:Button label="Change Font Size" click="changeFontSize()"/>
		</mx:HBox>
		<twaver:Network id="network" width="100%" height="100%" />
	</mx:VBox>
</mx:Application>

恩，这就是我想要的效果：

更多关于FTE和TLF的信息，请参考Adobe官方文档：
TextLayoutFormat
TextFlow
Textlayout
本文完整代码见附件：FTELabelAttachment