在TWaver Flex中实现垂直文字布局

Posted on 2012-05-04 11:30 TWaver 阅读(2260) 评论(1) 编辑收藏

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：

1 network.labelFunction = function (element:IElement):String {
2     var name:String = element.name;
3     if(element.getClient('vertical')) {
4         var result:String = '';
5         for(var i:int=0,n:int=name.length; i<n; i++) {
6             result += name.charAt(i) + '\n';
7         }
8         result = result.substr(0, result.length-1);
9         return result;
10     } else {
11         return name;
12     }
13 };

来段代码测试看看：

1 <?xml version="1.0" encoding="utf-8"?>
2 <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
3                 xmlns:twaver="http://www.servasoftware.com/2009/twaver/flex"
4                 layout="absolute" width="100%" height="100%"
5                 creationComplete="init()" backgroundColor="#FFFFFF" >
6     <mx:Script>
7         <![CDATA[
8             import twaver.Consts;
9             import twaver.ElementBox;
10             import twaver.IElement;
11             import twaver.Node;
12             import twaver.Styles;
13
14             private var box:ElementBox = new ElementBox();
15
16             private function init():void {
17                 network.labelFunction = function (element:IElement):String {
18                     var name:String = element.name;
19                     if(element.getClient('vertical')) {
20                         var result:String = '';
21                         for(var i:int=0,n:int=name.length; i<n; i++) {
22                             result += name.charAt(i) + '\n';
23                         }
24                         result = result.substr(0, result.length-1);
25                         return result;
26                     } else {
27                         return name;
28                     }
29                 };
30
31                 var node1:Node = new Node();
32                 node1.location = new Point(100, 100);
33                 node1.setStyle(Styles.LABEL_POSITION, Consts.POSITION_LEFT_LEFT);
34                 node1.setClient('vertical', true);
35                 node1.name = '竖向文字Vertical Text';
36                 box.add(node1);
37
38                 network.elementBox = box;
39             }
40         ]]>
41     </mx:Script>
42     <twaver:Network id="network" width="100%" height="100%" />
43 </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)，可以很容易地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：

1 package {
2     import flash.display.Sprite;
3
4     import flashx.textLayout.container.ContainerController;
5     import flashx.textLayout.conversion.TextConverter;
6     import flashx.textLayout.elements.TextFlow;
7     import flashx.textLayout.formats.BlockProgression;
8     import flashx.textLayout.formats.TextLayoutFormat;
9
10     public class StaticHelloWorld extends Sprite {
11         public function StaticHelloWorld() {
12             var textLayoutFormat:TextLayoutFormat = new TextLayoutFormat();
13             textLayoutFormat.lineHeight = 30;
14             textLayoutFormat.locale = 'zh';
15             textLayoutFormat.blockProgression = BlockProgression.RL;
16
17             var text:String = "测试竖向文字，再看看English如何？";
18             var textFlow:TextFlow = TextConverter.importToFlow(text, TextConverter.PLAIN_TEXT_FORMAT);
19             textFlow.hostFormat = textLayoutFormat;
20             textFlow.flowComposer.addController(new ContainerController(this, 25, 200));
21             textFlow.flowComposer.updateAllControllers();
22         }
23     }
24 }

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：

1 package {
  2     import flash.display.Sprite;
  3     import flash.text.engine.FontPosture;
  4     import flash.text.engine.FontWeight;
  5
  6     import flashx.textLayout.container.ContainerController;
  7     import flashx.textLayout.elements.ParagraphElement;
  8     import flashx.textLayout.elements.SpanElement;
  9     import flashx.textLayout.elements.TextFlow;
10     import flashx.textLayout.formats.BlockProgression;
11     import flashx.textLayout.formats.TextDecoration;
12     import flashx.textLayout.formats.TextLayoutFormat;
13
14     import twaver.Styles;
15     import twaver.network.ui.BasicAttachment;
16     import twaver.network.ui.ElementUI;
17
18     public class FTELabelAttachment extends BasicAttachment {
19
20         private var textLayoutFormat:TextLayoutFormat = new TextLayoutFormat();
21
22         public function FTELabelAttachment(elementUI:ElementUI, showInAttachmentCanvas:Boolean=false) {
23             super(elementUI, showInAttachmentCanvas);
24
25             this.textLayoutFormat.locale = 'zh';
26             this.textLayoutFormat.blockProgression = BlockProgression.RL;
27         }
28
29         override public function updateProperties():void {
30             super.updateProperties();
31
32             this.textLayoutFormat.fontFamily = element.getStyle(Styles.LABEL_FONT);
33             this.textLayoutFormat.color = element.getStyle(Styles.LABEL_COLOR);
34             this.textLayoutFormat.fontSize = element.getStyle(Styles.LABEL_SIZE);
35             this.textLayoutFormat.fontStyle = element.getStyle(Styles.LABEL_ITALIC) ? FontPosture.ITALIC : FontPosture.NORMAL;
36             this.textLayoutFormat.fontWeight = element.getStyle(Styles.LABEL_BOLD) ? FontWeight.BOLD : FontWeight.NORMAL;
37             this.textLayoutFormat.textDecoration = element.getStyle(Styles.LABEL_UNDERLINE ? TextDecoration.UNDERLINE : TextDecoration.NONE);
38
39             var textFlow:TextFlow = new TextFlow();
40             textFlow.hostFormat = this.textLayoutFormat;
41             var p:ParagraphElement = new ParagraphElement();
42             textFlow.addChild(p);
43             var span:SpanElement = new SpanElement();
44             span.text = network.getLabel(element);
45             p.addChild(span);
46
47             var fteLabel:Sprite = new Sprite();
48             this.content = fteLabel;
49             var containerController:ContainerController = new ContainerController(fteLabel, this.textLayoutFormat.fontSize, 1000);
50             textFlow.flowComposer.addController(containerController);
51             textFlow.flowComposer.updateAllControllers();
52         }
53
54         override public function get position():String {
55             return element.getStyle(Styles.LABEL_POSITION);
56         }
57
58         override public function get xOffset():Number {
59             return element.getStyle(Styles.LABEL_XOFFSET);
60         }
61
62         override public function get yOffset():Number {
63             return element.getStyle(Styles.LABEL_YOFFSET);
64         }
65
66         override public function get padding():Number {
67             return element.getStyle(Styles.LABEL_PADDING);
68         }
69
70         override public function get paddingLeft():Number {
71             return element.getStyle(Styles.LABEL_PADDING_LEFT);
72         }
73
74         override public function get paddingRight():Number {
75             return element.getStyle(Styles.LABEL_PADDING_RIGHT);
76         }
77
78         override public function get paddingTop():Number {
79             return element.getStyle(Styles.LABEL_PADDING_TOP);
80         }
81
82         override public function get paddingBottom():Number {
83             return element.getStyle(Styles.LABEL_PADDING_BOTTOM);
84         }
85
86         override public function get cornerRadius():Number {
87             return element.getStyle(Styles.LABEL_CORNER_RADIUS);
88         }
89
90         override public function get pointerLength():Number {
91             return element.getStyle(Styles.LABEL_POINTER_LENGTH);
92         }
93
94         override public function get pointerWidth():Number {
95             return element.getStyle(Styles.LABEL_POINTER_WIDTH);
96         }
97
98         override public function get direction():String {
99             return element.getStyle(Styles.LABEL_DIRECTION);
100         }
101
102         override public function get fill():Boolean {
103             return element.getStyle(Styles.LABEL_FILL);
104         }
105
106         override public function get fillColor():Number {
107             return element.getStyle(Styles.LABEL_FILL_COLOR);
108         }
109
110         override public function get fillAlpha():Number {
111             return element.getStyle(Styles.LABEL_FILL_ALPHA);
112         }
113
114         override public function get gradient():String {
115             return element.getStyle(Styles.LABEL_GRADIENT);
116         }
117
118         override public function get gradientColor():Number {
119             return element.getStyle(Styles.LABEL_GRADIENT_COLOR);
120         }
121
122         override public function get gradientAlpha():Number {
123             return element.getStyle(Styles.LABEL_GRADIENT_ALPHA);
124         }
125
126         override public function get contentXScale():Number {
127             return element.getStyle(Styles.LABEL_CONTENT_XSCALE);
128         }
129
130         override public function get contentYScale():Number {
131             return element.getStyle(Styles.LABEL_CONTENT_YSCALE);
132         }
133
134         override public function get outlineWidth():Number {
135             return element.getStyle(Styles.LABEL_OUTLINE_WIDTH);
136         }
137
138         override public function get outlineColor():Number {
139             return element.getStyle(Styles.LABEL_OUTLINE_COLOR);
140         }
141
142         override public function get outlineAlpha():Number {
143             return element.getStyle(Styles.LABEL_OUTLINE_ALPHA);
144         }
145     }
146 }

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

1 package {
2     import twaver.Node;
3
4     public class FTELabelNode extends Node {
5         public function FTELabelNode(id:Object=null) {
6             super(id);
7         }
8
9         public override function get elementUIClass():Class {
10             return FTELabelNodeUI;
11         }
12     }
13 }

自定义NodeUI：

1 package {
2     import twaver.Node;
3     import twaver.network.Network;
4     import twaver.network.ui.NodeUI;
5
6     public class FTELabelNodeUI extends NodeUI {
7
8         private var _labelAttachment:FTELabelAttachment = null;
9
10         public function FTELabelNodeUI(network:Network, node:Node) {
11             super(network, node);
12         }
13
14         override protected function checkLabelAttachment():void{
15             var label:String = this.network.getLabel(element);
16             if(label != null && label != ""){
17                 if(this._labelAttachment == null){
18                     this._labelAttachment = new FTELabelAttachment(this, false);
19                     this.addAttachment(this._labelAttachment);
20                 }
21             }else{
22                 if(this._labelAttachment != null){
23                     this.removeAttachment(this._labelAttachment);
24                     this._labelAttachment = null;
25                 }
26             }
27         }
28     }
29 }
30

最后，写个例子看看效果：

1 <?xml version="1.0" encoding="utf-8"?>
2 <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
3                 xmlns:twaver="http://www.servasoftware.com/2009/twaver/flex"
4                 layout="absolute" width="100%" height="100%"
5                 creationComplete="init()" backgroundColor="#FFFFFF" >
6     <mx:Script>
7         <![CDATA[
8             import twaver.Consts;
9             import twaver.ElementBox;
10             import twaver.IElement;
11             import twaver.Node;
12             import twaver.Styles;
13
14             private var box:ElementBox = new ElementBox();
15
16             private function init():void {
17                 network.labelFunction = function (element:IElement):String {
18                     var name:String = element.name;
19                     if(element.getClient('vertical')) {
20                         var result:String = '';
21                         for(var i:int=0,n:int=name.length; i<n; i++) {
22                             result += name.charAt(i) + '\n';
23                         }
24                         result = result.substr(0, result.length-1);
25                         return result;
26                     } else {
27                         return name;
28                     }
29                 };
30
31                 var node1:Node = new Node();
32                 node1.location = new Point(100, 100);
33                 node1.setStyle(Styles.LABEL_POSITION, Consts.POSITION_LEFT_LEFT);
34                 node1.setClient('vertical', true);
35                 node1.name = '竖向文字Vertical Text';
36                 box.add(node1);
37
38                 var node2:Node = new FTELabelNode();
39                 node2.location = new Point(300, 100);
40                 node2.setStyle(Styles.LABEL_POSITION, Consts.POSITION_LEFT_LEFT);
41                 node2.name = '竖向文字Vertical Text';
42                 box.add(node2);
43
44                 network.elementBox = box;
45             }
46
47             private function changeFontSize():void {
48                 box.forEach(function (element:IElement):void {
49                     element.setStyle(Styles.LABEL_SIZE, element.getStyle(Styles.LABEL_SIZE) + 2);
50                 });
51             }
52         ]]>
53     </mx:Script>
54     <mx:VBox width="100%" height="100%">
55         <mx:HBox width="100%" height="20">
56             <mx:Button label="Change Font Size" click="changeFontSize()"/>
57         </mx:HBox>
58         <twaver:Network id="network" width="100%" height="100%" />
59     </mx:VBox>
60 </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

# re: 在TWaver Flex中实现垂直文字布局 回复 更多评论

2012-05-09 12:31 by 活性炭

挺不错的好好

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