用于 Adobe® Flash® Platform 的 ActionScript® 3.0 参考
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flash.text 

TextLineMetrics  - AS3

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adobe.utils
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com.adobe.acm.solutions.authoring.domain.extensions
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com.adobe.consulting.pst.vo
com.adobe.dct.component
com.adobe.dct.component.datadictionary
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com.adobe.ep.taskmanagement.domain
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com.adobe.ep.ux.attachmentlist.component
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com.adobe.ep.ux.taskaction.component
com.adobe.ep.ux.taskaction.domain
com.adobe.ep.ux.taskaction.domain.events
com.adobe.ep.ux.taskaction.skin
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com.adobe.ep.ux.taskdetails.domain
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com.adobe.ep.ux.tasklist.component
com.adobe.ep.ux.tasklist.domain
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com.adobe.ep.ux.webdocumentviewer.domain
com.adobe.exm.expression
com.adobe.exm.expression.error
com.adobe.exm.expression.event
com.adobe.exm.expression.impl
com.adobe.fiber.runtime.lib
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com.adobe.fiber.services.wrapper
com.adobe.fiber.styles
com.adobe.fiber.util
com.adobe.fiber.valueobjects
com.adobe.gravity.binding
com.adobe.gravity.context
com.adobe.gravity.flex.bundleloader
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com.adobe.gravity.init
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com.adobe.gravity.service.logging
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com.adobe.gravity.utility
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com.adobe.icc.dc.domain
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com.adobe.livecycle.assetmanager.client.utils
com.adobe.livecycle.content
com.adobe.livecycle.rca.model
com.adobe.livecycle.rca.model.constant
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com.adobe.livecycle.rca.service.process.delegate
com.adobe.livecycle.rca.token
com.adobe.livecycle.ria.security.api
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com.adobe.mosaic.layouts
com.adobe.mosaic.layouts.dragAndDrop
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com.adobe.mosaic.mxml
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com.adobe.mosaic.sparklib.text
com.adobe.mosaic.sparklib.util
com.adobe.solutions.acm.authoring.presentation
com.adobe.solutions.acm.authoring.presentation.actionbar
com.adobe.solutions.acm.authoring.presentation.common
com.adobe.solutions.acm.authoring.presentation.events
com.adobe.solutions.acm.authoring.presentation.fragment
com.adobe.solutions.acm.authoring.presentation.letter
com.adobe.solutions.acm.authoring.presentation.letter.data
com.adobe.solutions.acm.authoring.presentation.preview
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com.adobe.solutions.acm.ccr.presentation.contentcapture
com.adobe.solutions.acm.ccr.presentation.contentcapture.events
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com.adobe.solutions.acm.ccr.presentation.datacapture
com.adobe.solutions.acm.ccr.presentation.datacapture.renderers
com.adobe.solutions.acm.ccr.presentation.pdf
com.adobe.solutions.exm
com.adobe.solutions.exm.authoring
com.adobe.solutions.exm.authoring.components.controls
com.adobe.solutions.exm.authoring.components.toolbars
com.adobe.solutions.exm.authoring.domain
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com.adobe.solutions.exm.authoring.domain.method
com.adobe.solutions.exm.authoring.domain.variable
com.adobe.solutions.exm.authoring.enum
com.adobe.solutions.exm.authoring.events
com.adobe.solutions.exm.authoring.model
com.adobe.solutions.exm.authoring.renderer
com.adobe.solutions.exm.authoring.view
com.adobe.solutions.exm.expression
com.adobe.solutions.exm.impl
com.adobe.solutions.exm.impl.method
com.adobe.solutions.exm.method
com.adobe.solutions.exm.mock
com.adobe.solutions.exm.mock.method
com.adobe.solutions.exm.runtime
com.adobe.solutions.exm.runtime.impl
com.adobe.solutions.exm.variable
com.adobe.solutions.prm.constant
com.adobe.solutions.prm.domain
com.adobe.solutions.prm.domain.factory
com.adobe.solutions.prm.domain.impl
com.adobe.solutions.prm.domain.manager
com.adobe.solutions.prm.presentation.asset
com.adobe.solutions.prm.presentation.constant
com.adobe.solutions.prm.presentation.document
com.adobe.solutions.prm.presentation.event
com.adobe.solutions.prm.presentation.file
com.adobe.solutions.prm.presentation.project
com.adobe.solutions.prm.presentation.team
com.adobe.solutions.prm.presentation.util
com.adobe.solutions.prm.service
com.adobe.solutions.prm.services.impl
com.adobe.solutions.prm.vo
com.adobe.solutions.rca.constant
com.adobe.solutions.rca.domain
com.adobe.solutions.rca.domain.common
com.adobe.solutions.rca.domain.factory
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com.adobe.solutions.rca.presentation
com.adobe.solutions.rca.presentation.comment
com.adobe.solutions.rca.presentation.constant
com.adobe.solutions.rca.presentation.event
com.adobe.solutions.rca.presentation.gantt
com.adobe.solutions.rca.presentation.gantt.ruler
com.adobe.solutions.rca.presentation.template
com.adobe.solutions.rca.presentation.template.audit
com.adobe.solutions.rca.presentation.template.definition
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com.adobe.solutions.rca.presentation.template.stages
com.adobe.solutions.rca.presentation.util
com.adobe.solutions.rca.service
com.adobe.solutions.rca.services.impl
com.adobe.solutions.rca.vo
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com.adobe.viewsource
fl.accessibility
fl.containers
fl.controls
fl.controls.dataGridClasses
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fl.core
fl.data
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fl.ik
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flash.crypto
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flash.text.engine
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flash.ui
flash.utils
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flashx.textLayout
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xd.core.axm.enterprise.view.components
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不推荐使用的元素的列表
AccessibilityImplementation 常量
如何使用 ActionScript 示例
法律声明
flash.text
public class TextLineMetrics
继承TextLineMetrics Inheritance Object

语言版本: ActionScript 3.0
运行时版本: AIR 1.0, Flash Player 9, Flash Lite 4

TextLineMetrics 类包含文本字段中某行文本的文本位置和度量值的相关信息。所有度量值均以像素为单位。此类的对象由 flash.text.TextField.getLineMetrics() 方法返回。

有关与包含文本行的文本字段相关的度量值(例如,图中的“文本字段高度”度量值),请参阅 flash.text.TextField。

下图表示了文本字段的点和度量值以及该字段包含的文本行:

演示文本度量的图像

查看示例

相关 API 元素



公共属性
 属性由以下参数定义
  ascent : Number
文本的上缘值是从基线到行高度顶部的长度,以像素为单位。
TextLineMetrics
 Inheritedconstructor : Object
对类对象或给定对象实例的构造函数的引用。
Object
  descent : Number
文本的下缘值是从基线到行深度底部的长度,以像素为单位。
TextLineMetrics
  height : Number
高度值是选定行中的文本的高度(并不一定是完整文本),以像素为单位。
TextLineMetrics
  leading : Number
前导值是文本行之间的垂直距离的度量值。
TextLineMetrics
  width : Number
宽度值是选定行中的文本的宽度(并不一定是完整文本),以像素为单位。
TextLineMetrics
  x : Number
x 值是第一个字符的左侧位置,以像素为单位。
TextLineMetrics
公共方法
 方法由以下参数定义
  
TextLineMetrics(x:Number, width:Number, height:Number, ascent:Number, descent:Number, leading:Number)
创建 TextLineMetrics 对象。
TextLineMetrics
 Inherited
表示对象是否已经定义了指定的属性。
Object
 Inherited
表示 Object 类的实例是否在指定为参数的对象的原型链中。
Object
 Inherited
表示指定的属性是否存在、是否可枚举。
Object
 Inherited
设置循环操作动态属性的可用性。
Object
 Inherited
返回此对象的字符串表示形式,其格式设置遵守区域设置特定的约定。
Object
 Inherited
返回指定对象的字符串表示形式。
Object
 Inherited
返回指定对象的原始值。
Object
属性详细信息

ascent

属性
public var ascent:Number

语言版本: ActionScript 3.0
运行时版本: AIR 1.0, Flash Player 9, Flash Lite 4

文本的上缘值是从基线到行高度顶部的长度,以像素为单位。请参阅此类概述部分的插图中的“上缘”度量值。

相关 API 元素

descent

属性 
public var descent:Number

语言版本: ActionScript 3.0
运行时版本: AIR 1.0, Flash Player 9, Flash Lite 4

文本的下缘值是从基线到行深度底部的长度,以像素为单位。请参阅此类概述部分的插图中的“下缘”度量值。

相关 API 元素

height

属性 
public var height:Number

语言版本: ActionScript 3.0
运行时版本: AIR 1.0, Flash Player 9, Flash Lite 4

高度值是选定行中的文本的高度(并不一定是完整文本),以像素为单位。文本行的高度不包括装订线高度。请参阅此类概述部分的插图中的“行高”度量值。

相关 API 元素

leading

属性 
public var leading:Number

语言版本: ActionScript 3.0
运行时版本: AIR 1.0, Flash Player 9, Flash Lite 4

前导值是文本行之间的垂直距离的度量值。请参阅此类概述部分的插图中的“前导”度量值。

相关 API 元素

width

属性 
public var width:Number

语言版本: ActionScript 3.0
运行时版本: AIR 1.0, Flash Player 9, Flash Lite 4

宽度值是选定行中的文本的宽度(并不一定是完整文本),以像素为单位。文本行的宽度与文本字段的宽度不同。文本行的宽度与文本字段的宽度有关,它等于文本字段的宽度减去 4 个像素的装订线宽度(每边 2 个像素)。请参阅此类概述部分的插图中的“文本行宽度”度量值。

相关 API 元素

x

属性 
public var x:Number

语言版本: ActionScript 3.0
运行时版本: AIR 1.0, Flash Player 9, Flash Lite 4

x 值是第一个字符的左侧位置,以像素为单位。此值包括边距、缩进(如果有)和装订线宽度。请参阅此类概述部分的插图中的“文本行 x 位置”。

相关 API 元素

构造函数详细信息

TextLineMetrics

()构造函数
public function TextLineMetrics(x:Number, width:Number, height:Number, ascent:Number, descent:Number, leading:Number)

语言版本: ActionScript 3.0
运行时版本: AIR 1.0, Flash Player 9, Flash Lite 4

创建 TextLineMetrics 对象。TextLineMetrics 对象包含文本字段中文本行的相关文本度量信息。此类的对象由 flash.text.TextField.getLineMetrics() 方法返回。

有关上下文中提到的属性,请参阅此类概述部分的插图。

参数
x:Number — 第一个字符的左侧位置,以像素为单位。
 
width:Number — 选定行中文本的宽度(并不一定是完整文本),以像素为单位。
 
height:Number — 选定行中文本的高度(并不一定是完整文本),以像素为单位。
 
ascent:Number — 从基线到行顶部的长度,以像素为单位。
 
descent:Number — 从基线到行底部的长度,以像素为单位。
 
leading:Number — 文本行之间的垂直距离度量值。

相关 API 元素

TextLineMetricsExample.as

下例创建了类 TextLineMetricsExample 和 LineMetricsReader 以通过 XML 对象输出 Flash Player 中的消息。这是使用以下步骤完成的:
  1. 创建名为 label 的 TextField 类型的属性。
  2. 构造函数调用 configureAssets(),该构造函数可执行以下操作:
    • 将舞台的对齐方式设置为靠左上角对齐,且不进行缩放。
    • 创建新的 TextField 对象,名为 label
    • 启用 label 的背景并将颜色设置为白色。
    • 允许 label 的文本通过自动换行来跨多行。
    • 将对 getLabelText() 调用的结果赋给 labeltext 属性。getLabelText() 方法创建一个 XML 类型的变量并将该变量赋给一个名为 body 的 XML 节点,该节点填充了一个长句子。
    • 使用 addChild()label 添加到显示列表中。
  3. 然后会添加侦听在舞台上执行的 resize 事件的方法,方法名为 resizeHandler()。每次更改 Flash Player 窗口大小时,都会调度 RESIZE 事件,并执行以下操作:
    • 调用 draw() 以确保 label 显示在舞台的中央,并在四周各留出 10 像素的缓冲距离。
    • setTimeout() 然后在短暂的延迟后执行 showMetrics()。添加延迟的原因是,在 RESIZE 事件完成并且舞台被完全重绘以前,行度量不会更新。
    • showMetrics() 将名为 metrics 的 TextLineMetrics 变量赋给对 getLineMetrics() 的调用结果,然后将此变量传递给 LineMetricsReader 实例的新实例,新实例名为 reader。然后,在对 trace() 的调用中使用这两个变量,以输出 label 的第一行(只有这一行)和由 LineMetricsReader 实例通过其 toString() 方法提供的信息。
  4. 构造函数强制 resize 事件的一次调度,以便在第一次加载 SWF 文件时迫使 label 绘制正确。
package {
    import flash.display.Sprite;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import flash.events.*;
    import flash.text.TextField;
    import flash.text.TextLineMetrics;
    import flash.utils.setTimeout;

    public class TextLineMetricsExample extends Sprite {
        private var gutter:int = 10;
        private var label:TextField;

        public function TextLineMetricsExample() {
            configureAssets();
            configureListeners();
            resizeHandler(new Event(Event.RESIZE));
        }

        private function showMetrics():void {
            var metrics:TextLineMetrics = label.getLineMetrics(0);
            var reader:LineMetricsReader = new LineMetricsReader(metrics);
            trace("lineText: " + label.getLineText(0));
            trace("metrics: " + reader);
        }

        private function configureAssets():void {
            stage.align = StageAlign.TOP_LEFT;
            stage.scaleMode = StageScaleMode.NO_SCALE;

            label = new TextField();
            label.background = true;
            label.backgroundColor = 0xFFFFFF;
            label.multiline = true;
            label.wordWrap = true;
            label.text = getLabelText();
            addChild(label);
        }

        private function configureListeners():void {
            stage.addEventListener(Event.RESIZE, resizeHandler);
        }

        private function resizeHandler(event:Event):void {
            draw();
            setTimeout(showMetrics, 100);
        }

        private function draw():void {
            label.x = gutter;
            label.y = gutter;
            label.width = stage.stageWidth - (gutter * 2);
            label.height = stage.stageHeight - (gutter * 2);
        }

        private function getLabelText():String {
            var text:XML = <body>The Flex product line enables developers to build rich Internet applications that blend the responsiveness of desktop software, the cross-platform reach of the web, and the expressiveness of the Flash Platform.</body>
            return text.toString();
        }
    }
}

import flash.text.TextLineMetrics;

class LineMetricsReader {
    private var metrics:TextLineMetrics;

    public function LineMetricsReader(metrics:TextLineMetrics) {
        this.metrics = metrics;
    }

    public function toString():String {
        return "[TextLineMetrics ascent:" + metrics.ascent
            + ", descent:" + metrics.descent
            + ", leading:" + metrics.leading
            + ", width:" + metrics.width
            + ", height:" + metrics.height
            + ", x:" + metrics.x
            + "]";
    }
}




[ X ]为什么显示为英语?
《ActionScript 3.0 参考》中的内容以英语显示

《ActionScript 3.0 参考》中的部分内容未翻译成所有语言。当某个语言元素未翻译时,将显示为英语。例如,ga.controls.HelpBox 类未翻译成任何语言。因此在简体中文版的参考中,ga.controls.HelpBox 类显示为英语。