属性字符串StyledString/MutableStyledString（其中MutableStyledString继承自StyledString，下文统称为StyledString），可用于在字符或段落级别上设置文本样式。将StyledString应用到文本组件上，可以采用多种方式修改文本，包括调整字号、添加字体颜色、使文本具备可点击性，以及通过自定义方式绘制文本等。具体使用方法请参考属性字符串的API文档。

属性字符串提供多种类型样式对象，涵盖各种常见的文本样式格式，例如文本装饰线样式、文本行高样式、文本阴影样式等。也可以自行创建CustomSpan，以应用自定义样式。

创建并应用StyledString和MutableStyledString

可以通过TextController提供的setStyledString方法，将属性字符串附加到文本组件，并推荐在onPageShow或者文本组件的onAppear回调中触发绑定。

在aboutToAppear中调用setStyledString方法时，由于该方法运行阶段组件尚未完成创建并成功挂载节点树，因此无法在页面初始化时显示属性字符串。

从API version 15开始，在aboutToAppear中调用setStyledString方法，页面初始化时可以显示属性字符串。

@Entry
@Component
struct styled_string_demo1 {
  // 请将$r('app.string.CreateApply_Text_Forty_Five')替换为实际资源文件，在本示例中该资源文件的value值为"运动45分钟"
  styledString1: StyledString = new StyledString( this.getUIContext()
    .getHostContext()!.resourceManager.getStringSync($r('app.string.CreateApply_Text_Forty_Five').id));
  // 请将$r('app.string.CreateApply_Text_Third_Five')替换为实际资源文件，在本示例中该资源文件的value值为"运动35分钟"
  mutableStyledString1: MutableStyledString = new MutableStyledString( this.getUIContext()
    .getHostContext()!.resourceManager.getStringSync($r('app.string.CreateApply_Text_Third_Five').id));
  controller1: TextController = new TextController();
  controller2: TextController = new TextController();

  async onPageShow() {
    // 在生命周期onPageShow回调中绑定属性字符串
    this.controller1.setStyledString(this.styledString1);
  }

  build() {
    Column() {
      // 显示属性字符串
      Text(undefined, { controller: this.controller1 })
      Text(undefined, { controller: this.controller2 })
        .onAppear(() => {
          // 在组件onAppear回调中绑定属性字符串
          this.controller2.setStyledString(this.mutableStyledString1);
        })
    }
    .width('100%')
  }
}

设置文本样式

属性字符串目前提供了多种Style对象，包括TextStyle、TextShadowStyle、DecorationStyle、BaselineOffsetStyle、LineHeightStyle、LetterSpacingStyle，用于设置文本的各类样式。

创建及应用文本字体样式对象（TextStyle）

import { LengthMetrics } from '@kit.ArkUI';

@Entry
@Component
struct styled_string_demo2 {
  @State str: string =
    this.getUIContext().getHostContext()?.resourceManager.getStringByNameSync('CreateApply_Text_3') as string;
  textStyleAttrs: TextStyle =
    new TextStyle({
      fontWeight: FontWeight.Bolder,
      fontSize: LengthMetrics.vp(24),
      fontStyle: FontStyle.Italic,
      strokeWidth: LengthMetrics.px(5),
      strokeColor: Color.Green
    });
  mutableStyledString: MutableStyledString = new MutableStyledString(this.str, [
    {
      start: 2,
      length: 2,
      styledKey: StyledStringKey.FONT,
      styledValue: this.textStyleAttrs
    },
    {
      start: 7,
      length: 4,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({
        fontColor: Color.Orange, fontSize: LengthMetrics.vp(12),
        superscript: SuperscriptStyle.SUPERSCRIPT
      })
    }
  ]);
  controller: TextController = new TextController();

  async onPageShow() {
    this.controller.setStyledString(this.mutableStyledString);
  }

  build() {
    Column() {
      // 显示属性字符串
      Text(undefined, { controller: this.controller })
        .margin({ top: 10 })
    }
    .width('100%')
  }
}

创建及应用文本阴影对象（TextShadowStyle）

// xxx.ets
@Entry
@Component
struct styled_string_demo3 {
  @State str: string =
    this.getUIContext().getHostContext()?.resourceManager.getStringByNameSync('CreateApply_Text_Third_Five') as string;
  mutableStyledString: MutableStyledString = new MutableStyledString(this.str, [
    {
      start: 0,
      length: 3,
      styledKey: StyledStringKey.TEXT_SHADOW,
      styledValue: new TextShadowStyle({
        radius: 5,
        type: ShadowType.COLOR,
        color: Color.Red,
        offsetX: 10,
        offsetY: 10
      })
    }
  ]);
  controller: TextController = new TextController();

  async onPageShow() {
    this.controller.setStyledString(this.mutableStyledString);
  }

  build() {
    Column() {
      // 显示属性字符串
      Text(undefined, { controller: this.controller })
    }
    .width('100%')
  }
}

创建及应用文本装饰线对象（DecorationStyle）

// xxx.ets
@Entry
@Component
struct styled_string_demo4 {
  @State str: string =
    this.getUIContext()
      .getHostContext()?.resourceManager.getStringByNameSync('CreateApply_Text_Third_Five') as string;
  mutableStyledString: MutableStyledString = new MutableStyledString(this.str, [
    {
      start: 0,
      length: 4,
      styledKey: StyledStringKey.DECORATION,
      styledValue: new DecorationStyle({ type: TextDecorationType.LineThrough, color: Color.Red, thicknessScale: 3 })
    },
    {
      start: 4,
      length: 2,
      styledKey: StyledStringKey.DECORATION,
      styledValue: new DecorationStyle(
        {
          type: TextDecorationType.Underline,
        },
        {
          // 开启多装饰线
          enableMultiType: true
        }
      )
    },
    {
      start: 4,
      length: 2,
      styledKey: StyledStringKey.DECORATION,
      styledValue: new DecorationStyle(
        {
          type: TextDecorationType.LineThrough,
        },
        {
          // 开启多装饰线
          enableMultiType: true
        }
      )
    },
  ]);
  controller: TextController = new TextController();

  async onPageShow() {
    this.controller.setStyledString(this.mutableStyledString);
  }

  build() {
    Column() {
      // 显示属性字符串
      Text(undefined, { controller: this.controller })
    }
    .width('100%')
  }
}

创建及应用文本基线偏移量对象（BaselineOffsetStyle）

import { LengthMetrics } from '@kit.ArkUI';

// xxx.ets
@Entry
@Component
struct styled_string_demo5 {
  @State str: string =
    this.getUIContext().getHostContext()?.resourceManager.getStringByNameSync('CreateApply_Text_Third_Five') as string;

  mutableStyledString: MutableStyledString = new MutableStyledString(this.str, [
    {
      start: 0,
      length: 3,
      styledKey: StyledStringKey.BASELINE_OFFSET,
      styledValue: new BaselineOffsetStyle(LengthMetrics.px(20))
    }
  ]);
  controller: TextController = new TextController();

  async onPageShow() {
    this.controller.setStyledString(this.mutableStyledString);
  }

  build() {
    Column() {
      // 显示属性字符串
      Text(undefined, { controller: this.controller })
    }
    .width('100%')
  }
}

创建及应用文本行高对象（LineHeightStyle）

import { LengthMetrics } from '@kit.ArkUI';

// xxx.ets
@Entry
@Component
struct styled_string_demo6 {
  @State str: string =
    this.getUIContext()
      .getHostContext()?.resourceManager.getStringByNameSync('StyledStringStyle_Text_5') as string;
  mutableStyledString: MutableStyledString = new MutableStyledString(this.str, [
    {
      start: 8,
      length: 3,
      styledKey: StyledStringKey.LINE_HEIGHT,
      styledValue: new LineHeightStyle(LengthMetrics.vp(50))
    }
  ]);
  controller: TextController = new TextController();

  async onPageShow() {
    this.controller.setStyledString(this.mutableStyledString);
  }

  build() {
    Column() {
      // 显示属性字符串
      Text(undefined, { controller: this.controller })
    }
    .width('100%')
    .margin({ top: 10 })
  }
}

创建及应用文本字符间距对象（LetterSpacingStyle）

import { LengthMetrics, LengthUnit } from '@kit.ArkUI';

// xxx.ets
@Entry
@Component
struct styled_string_demo7 {
  @State str: string =
    this.getUIContext().getHostContext()?.resourceManager.getStringByNameSync('CreateApply_Text_Third_Five') as string;
  mutableStyledString: MutableStyledString = new MutableStyledString(this.str, [
    {
      start: 0,
      length: 2,
      styledKey: StyledStringKey.LETTER_SPACING,
      styledValue: new LetterSpacingStyle(new LengthMetrics(20, LengthUnit.VP))
    }
  ]);
  controller: TextController = new TextController();

  async onPageShow() {
    this.controller.setStyledString(this.mutableStyledString);
  }

  build() {
    Column() {
      // 显示属性字符串
      Text(undefined, { controller: this.controller })
    }
    .width('100%')
  }
}

设置段落样式

可通过ParagraphStyle设置段落样式布局。下图显示了如何分割文本中的段落，段落之间以换行符\n分隔。

以下代码示例展示了如何创建ParagraphStyle并应用。如果将ParagraphStyle附加到段落开头、末尾或之间的任何位置，均会应用样式，非段落区间内则不会应用样式。

import { LengthMetrics} from '@kit.ArkUI';

// xxx.ets
@Entry
@Component
struct Index {
  @State str: string =
    this.getUIContext()
      .getHostContext()?.resourceManager.getStringByNameSync('StyledStringParagraphStyle_Text_1') as string;
  titleParagraphStyleAttr: ParagraphStyle = new ParagraphStyle({ textAlign: TextAlign.Center });
  // 段落首行缩进15vp
  paragraphStyleAttr1: ParagraphStyle = new ParagraphStyle({ textIndent: LengthMetrics.vp(15) });
  // 行高样式对象
  lineHeightStyle1: LineHeightStyle = new LineHeightStyle(new LengthMetrics(24));
  // 创建含段落样式的对象paragraphStyledString1
  paragraphStyledString1: MutableStyledString =
    new MutableStyledString(this.str, [
      {
        start: 0,
        length: 4,
        styledKey: StyledStringKey.PARAGRAPH_STYLE,
        styledValue: this.titleParagraphStyleAttr
      },
      {
        start: 0,
        length: 4,
        styledKey: StyledStringKey.LINE_HEIGHT,
        styledValue: new LineHeightStyle(new LengthMetrics(50))
      }, {
      start: 0,
      length: 4,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontSize: LengthMetrics.vp(24), fontWeight: FontWeight.Bolder })
    },
      {
        start: 5,
        length: 3,
        styledKey: StyledStringKey.PARAGRAPH_STYLE,
        styledValue: this.paragraphStyleAttr1
      },
      {
        start: 5,
        length: 20,
        styledKey: StyledStringKey.LINE_HEIGHT,
        styledValue: this.lineHeightStyle1
      }
    ]);
  controller: TextController = new TextController();

  async onPageShow() {
    this.controller.setStyledString(this.paragraphStyledString1);
  }

  build() {
    Column() {
      // 显示属性字符串
      Text(undefined, { controller: this.controller })
    }
    .width('100%')
  }
}

除了可以在创建属性字符串时就预设样式，也可以后续通过replaceStyle清空原样式替换新样式，同时需要在附加的文本组件controller上主动触发更新绑定的属性字符串。

import { LengthMetrics } from '@kit.ArkUI';

// xxx.ets
@Entry
@Component
struct Index {
  context = this.getUIContext().getHostContext();
  /* 请将$r('app.string.StyledStringParagraphStyle_Text_2')替换为实际资源文件，在本示例中该资源文件的value值为
   * "段落标题\n正文第一段落开始0123456789正文第一段落结束，通过replaceStyle清空原样式替换新样式。"
   */
  @State message1: string =
    this.context!.resourceManager.getStringSync($r('app.string.StyledStringParagraphStyle_Text_2').id);
  titleParagraphStyleAttr: ParagraphStyle = new ParagraphStyle({ textAlign: TextAlign.Center });
  // 段落首行缩进15vp
  paragraphStyleAttr1: ParagraphStyle = new ParagraphStyle({ textIndent: LengthMetrics.vp(15) });
  // 行高样式对象
  lineHeightStyle1: LineHeightStyle = new LineHeightStyle(new LengthMetrics(24));
  // 创建含段落样式的对象paragraphStyledString1
  paragraphStyledString1: MutableStyledString =
    new MutableStyledString(this.message1, [
      {
        start: 0,
        length: 4,
        styledKey: StyledStringKey.PARAGRAPH_STYLE,
        styledValue: this.titleParagraphStyleAttr
      },
      {
        start: 0,
        length: 4,
        styledKey: StyledStringKey.LINE_HEIGHT,
        styledValue: new LineHeightStyle(new LengthMetrics(50))
      }, {
      start: 0,
      length: 4,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontSize: LengthMetrics.vp(24), fontWeight: FontWeight.Bolder })
    },
      {
        start: 5,
        length: 3,
        styledKey: StyledStringKey.PARAGRAPH_STYLE,
        styledValue: this.paragraphStyleAttr1
      },
      {
        start: 5,
        length: 20,
        styledKey: StyledStringKey.LINE_HEIGHT,
        styledValue: this.lineHeightStyle1
      }
    ]);
  paragraphStyleAttr3: ParagraphStyle = new ParagraphStyle({
    textAlign: TextAlign.End,
    maxLines: 1,
    wordBreak: WordBreak.BREAK_ALL,
    overflow: TextOverflow.Ellipsis
  });
  controller: TextController = new TextController();

  async onPageShow() {
    this.controller.setStyledString(this.paragraphStyledString1);
  }

  build() {
    Column() {
      // 显示属性字符串
      Text(undefined, { controller: this.controller }).width(300)
      // 请将$r('app.string.Replace_paragraph_style')替换为实际资源文件，在本示例中该资源文件的value值为"替换段落样式"
      Button($r('app.string.Replace_paragraph_style'))
        .onClick(() => {
          this.paragraphStyledString1.replaceStyle({
            start: 5,
            length: 3,
            styledKey: StyledStringKey.PARAGRAPH_STYLE,
            styledValue: this.paragraphStyleAttr3
          });
          this.controller.setStyledString(this.paragraphStyledString1);
        })
    }
    .width('100%')
  }
}

支持将属性字符串转换成Paragraph

可通过getParagraphs将属性字符串根据文本布局选项转换成对应的Paragraph数组。

以下示例展示了通过getParagraphs方法将属性字符串转换为Paragraph对象，进而通过Paragraph对象实现文本测算功能。当内容超出最大显示行数的时候，截断文本显示并展示“...全文”的效果。

import { LengthMetrics } from '@kit.ArkUI';
import { drawing } from '@kit.ArkGraphics2D';

class MyCustomSpan extends CustomSpan {
  constructor(word: string, width: number, height: number, context: UIContext) {
    super();
    this.word = word;
    this.width = width;
    this.height = height;
    this.context = context;
  }

  onMeasure(measureInfo: CustomSpanMeasureInfo): CustomSpanMetrics {
    return { width: this.width, height: this.height };
  }

  onDraw(context: DrawContext, options: CustomSpanDrawInfo) {
    let canvas = context.canvas;
    const brush = new drawing.Brush();
    brush.setColor({
      alpha: 255,
      red: 0,
      green: 74,
      blue: 175
    });
    const font = new drawing.Font();
    font.setSize(25);
    const textBlob = drawing.TextBlob.makeFromString(this.word, font, drawing.TextEncoding.TEXT_ENCODING_UTF8);
    canvas.attachBrush(brush);
    canvas.drawRect({
      left: options.x + 10,
      right: options.x + this.context.vp2px(this.width) - 10,
      top: options.lineTop + 10,
      bottom: options.lineBottom - 10
    });
    brush.setColor({
      alpha: 255,
      red: 23,
      green: 169,
      blue: 141
    });
    canvas.attachBrush(brush);
    canvas.drawTextBlob(textBlob, options.x + 20, options.lineBottom - 15);
    canvas.detachBrush();
  }

  setWord(word: string) {
    this.word = word;
  }

  public width: number = 160;
  public word: string = 'drawing';
  public height: number = 10;
  public context: UIContext;
}

@Entry
@Component
struct Index {
  // 请在resources\base\element\string.json文件中配置name为'Full_text'，value为非空字符串的资源
  @State fullText: string =
    this.getUIContext().getHostContext()?.resourceManager.getStringByNameSync('Full_text') as string;
  // 请将$r('app.string.Original_text')替换为实际资源文件，在本示例中该资源文件的value值为"原文"
  @State originalText: ResourceStr = $r('app.string.Original_text');
  // 请将$r('app.string.After_typesetting')替换为实际资源文件，在本示例中该资源文件的value值为"排版后"
  @State afterTypesetting: ResourceStr = $r('app.string.After_typesetting');
  str: string =
    'Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal.';
  mutableStr2 = new MutableStyledString(this.str, [
    {
      start: 0,
      length: 3,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontSize: LengthMetrics.px(20) })
    },
    {
      start: 3,
      length: 3,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontColor: Color.Brown })
    }
  ]);

  // 测算属性字符串在指定宽度下能显示的行数
  getLineNum(styledString: StyledString, width: LengthMetrics) {
    let paragraphArr = this.getUIContext().getMeasureUtils().getParagraphs(styledString, { constraintWidth: width });
    let res = 0;
    for (let i = 0; i < paragraphArr.length; ++i) {
      res += paragraphArr[i].getLineCount();
    }
    return res;
  }

  // 测算属性字符串显示maxLines行时最多可以显示的字数
  getCorrectIndex(styledString: MutableStyledString, maxLines: number, width: LengthMetrics) {
    let low = 0;
    let high = styledString.length - 1;
    // 使用二分查找
    while (low <= high) {
      let mid = (low + high) >> 1;
      console.info('demo: get ' + low + ' ' + high + ' ' + mid);
      let moreStyledString = new MutableStyledString(this.fullText, [{
        start: 4,
        length: 2,
        styledKey: StyledStringKey.FONT,
        styledValue: new TextStyle({ fontColor: Color.Blue })
      }]);
      moreStyledString.insertStyledString(0, styledString.subStyledString(0, mid));
      let lineNum = this.getLineNum(moreStyledString, LengthMetrics.px(500));
      if (lineNum <= maxLines) {
        low = mid + 1;
      } else {
        high = mid - 1;
      }
    }
    return high;
  }

  mutableStrAllContent = new MutableStyledString(this.str, [
    {
      start: 0,
      length: 3,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontSize: LengthMetrics.px(40) })
    },
    {
      start: 3,
      length: 3,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontColor: Color.Brown })
    }
  ]);
  customSpan1: MyCustomSpan = new MyCustomSpan('Hello', 120, 10, this.getUIContext());
  mutableStrAllContent2 = new MutableStyledString(this.str, [
    {
      start: 0,
      length: 3,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontSize: LengthMetrics.px(100) })
    },
    {
      start: 3,
      length: 3,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontColor: Color.Brown })
    }
  ]);
  controller: TextController = new TextController();
  controller2: TextController = new TextController();
  textController: TextController = new TextController();
  textController2: TextController = new TextController();

  aboutToAppear() {
    this.mutableStrAllContent2.insertStyledString(0, new StyledString(this.customSpan1));
    this.mutableStr2.insertStyledString(0, new StyledString(this.customSpan1));
  }

  build() {
    Scroll() {
      Column() {
        Text(this.originalText)
        Text(undefined, { controller: this.controller }).width('500px').onAppear(() => {
          this.controller.setStyledString(this.mutableStrAllContent);
        })
        Divider().strokeWidth(8).color('#F1F3F5')
        Text(this.afterTypesetting)
        Text(undefined, { controller: this.textController }).onAppear(() => {
          let now = this.getCorrectIndex(this.mutableStrAllContent, 3, LengthMetrics.px(500));
          if (now != this.mutableStrAllContent.length - 1) {
            let moreStyledString = new MutableStyledString(this.fullText, [{
              start: 4,
              length: 2,
              styledKey: StyledStringKey.FONT,
              styledValue: new TextStyle({ fontColor: Color.Blue })
            }]);
            moreStyledString.insertStyledString(0, this.mutableStrAllContent.subStyledString(0, now));
            this.textController.setStyledString(moreStyledString);
          } else {
            this.textController.setStyledString(this.mutableStrAllContent);
          }
        })
          .width('500px')
        Divider().strokeWidth(8).color('#F1F3F5')
        Text(this.originalText)
        Text(undefined, { controller: this.controller2 }).width('500px').onAppear(() => {
          this.controller2.setStyledString(this.mutableStrAllContent2);
        })
        Divider().strokeWidth(8).color('#F1F3F5')
        Text(this.afterTypesetting)
        Text(undefined, { controller: this.textController2 }).onAppear(() => {
          let now = this.getCorrectIndex(this.mutableStrAllContent2, 3, LengthMetrics.px(500));
          let moreStyledString = new MutableStyledString(this.fullText, [{
            start: 4,
            length: 2,
            styledKey: StyledStringKey.FONT,
            styledValue: new TextStyle({ fontColor: Color.Blue })
          }]);
          moreStyledString.insertStyledString(0, this.mutableStrAllContent2.subStyledString(0, now));
          this.textController2.setStyledString(moreStyledString);
        })
          .width('500px')
      }.width('100%')
    }
  }
}

使用图片

可通过ImageAttachment来添加图片。

以下示例展示了如何将图片和文本附加到同一个MutableStyledString对象上，并实现图文混排。

属性字符串的构造函数constructor中，当入参value的类型为ImageAttachment或CustomSpan时，styles参数不生效。需要设置styles时，通过setStyle、insertStyledString等方法实现。

// xxx.ets
import { image } from '@kit.ImageKit';
import { LengthMetrics } from '@kit.ArkUI';
import { hilog } from '@kit.PerformanceAnalysisKit';

@Entry
@Component
struct StyledStringImageAttachment {
  @State abled: boolean = true;
  @State message: string = 'Hello World';
  imagePixelMap: image.PixelMap | undefined = undefined;
  @State imagePixelMap3: image.PixelMap | undefined = undefined;
  mutableStr: MutableStyledString = new MutableStyledString('123');
  controller: TextController = new TextController();
  mutableStr2: MutableStyledString = new MutableStyledString('This is set decoration line style to the mutableStr2', [{
    start: 0,
    length: 15,
    styledKey: StyledStringKey.DECORATION,
    styledValue: new DecorationStyle({
      type: TextDecorationType.Overline,
      color: Color.Orange,
      style: TextDecorationStyle.DOUBLE
    })
  }]);

  async aboutToAppear() {
    hilog.info(0x0000, 'testTag', 'aboutToAppear initial imagePixelMap');
    // $r('app.media.sea')需要替换为开发者所需的图像资源文件。
    this.imagePixelMap = await this.getPixmapFromMedia($r('app.media.sea'));
  }

  private async getPixmapFromMedia(resource: Resource) {
    try {
      let unit8Array = await this.getUIContext().getHostContext()?.resourceManager?.getMediaContent(resource.id);
      let imageSource = image.createImageSource(unit8Array?.buffer?.slice(0, unit8Array?.buffer?.byteLength));
      let createPixelMap: image.PixelMap = await imageSource.createPixelMap({
        desiredPixelFormat: image.PixelMapFormat.RGBA_8888
      });
      await imageSource.release();
      return createPixelMap;
    } catch (error) {
      hilog.error(0x0000, 'testTag', `Get Pixmap failed. error code: ${error.code}, error message: ${error.message}`);
    }
    return undefined;
  }

  leadingMarginValue: ParagraphStyle = new ParagraphStyle({ leadingMargin: LengthMetrics.vp(5)});
  // 行高样式对象
  lineHeightStyle1: LineHeightStyle = new LineHeightStyle(new LengthMetrics(24));
  // Bold样式
  boldTextStyle: TextStyle = new TextStyle({ fontWeight: FontWeight.Bold });
  // 创建含段落样式的对象paragraphStyledString1
  // 请将$r('app.string.StyledStringImageAttachment_Text_1')替换为实际资源文件，在本示例中该资源文件的value值为"\n品牌相纸 高清冲印30张\n限时直降5.15元 限量赠送"
  paragraphStyledString1: MutableStyledString =
    new MutableStyledString(this.getUIContext()
      .getHostContext()!.resourceManager.getStringSync($r('app.string.StyledStringImageAttachment_Text_1').id), [
    {
      start: 0,
      length: 28,
      styledKey: StyledStringKey.PARAGRAPH_STYLE,
      styledValue: this.leadingMarginValue
    },
    {
      start: 14,
      length: 9,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontSize: LengthMetrics.vp(14), fontColor: '#B22222' })
    },
    {
      start: 24,
      length: 4,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontSize: LengthMetrics.vp(14), fontWeight: FontWeight.Lighter })
    },
    {
      start: 11,
      length: 4,
      styledKey: StyledStringKey.LINE_HEIGHT,
      styledValue: this.lineHeightStyle1
    }
  ]);
  // 请将$r('app.string.StyledStringImageAttachment_Text_2')替换为实际资源文件，在本示例中该资源文件的value值为"\n￥16.21 3000+人好评"
  paragraphStyledString2: MutableStyledString =
    new MutableStyledString(this.getUIContext()
      .getHostContext()!.resourceManager.getStringSync($r('app.string.StyledStringImageAttachment_Text_2').id), [
    {
      start: 0,
      length: 5,
      styledKey: StyledStringKey.PARAGRAPH_STYLE,
      styledValue: this.leadingMarginValue
    },
    {
      start: 0,
      length: 4,
      styledKey: StyledStringKey.LINE_HEIGHT,
      styledValue: new LineHeightStyle(new LengthMetrics(60))
    },
    {
      start: 0,
      length: 7,
      styledKey: StyledStringKey.FONT,
      styledValue: this.boldTextStyle
    },
    {
      start: 1,
      length: 1,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontSize: LengthMetrics.vp(18) })
    },
    {
      start: 2,
      length: 2,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontSize: LengthMetrics.vp(36) })
    },
    {
      start: 4,
      length: 3,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontSize: LengthMetrics.vp(20) })
    },
    {
      start: 7,
      length: 9,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontColor: Color.Grey, fontSize: LengthMetrics.vp(14)})
    }
  ]);

  build() {
    NavDestination() {
      Column({ space: 12 }) {
        // ...
          Row() {
            Column({ space: 10 }) {
              Text(undefined, { controller: this.controller })
                .id('text1')
                .copyOption(CopyOptions.InApp)
                .draggable(true)
                .backgroundColor('#FFFFFF')
                .borderRadius(5)
              // 请将$r('app.string.StyledStringImageAttachment_Button_1')替换为实际资源文件，在本示例中该资源文件的value值为"点击查看商品卡片"
              Button($r('app.string.StyledStringImageAttachment_Button_1'))
                .enabled(this.abled)
                .onClick(() => {
                  if (this.imagePixelMap !== undefined) {
                    this.mutableStr = new MutableStyledString(new ImageAttachment({
                      value: this.imagePixelMap,
                      size: { width: 180, height: 160 },
                      verticalAlign: ImageSpanAlignment.BASELINE,
                      objectFit: ImageFit.Fill
                    }));
                    this.paragraphStyledString1.appendStyledString(this.paragraphStyledString2);
                    this.mutableStr.appendStyledString(this.paragraphStyledString1);
                    this.controller.setStyledString(this.mutableStr);
                  }
                  this.abled = false;
                })
            }
            .width('100%')
          }
          .height('100%')
          .backgroundColor('#F8F8FF')
        }
        // ...
    }
    .backgroundColor('#f1f2f3')
    // 请将$r('app.string.StyledStringImageAttachment_title')替换为实际资源文件，在本示例中该资源文件的value值为"通过ImageAttachment来添加图片"
    .title($r('app.string.StyledStringImageAttachment_title'))
  }
}

设置事件

可通过GestureStyle设置onClick、onLongPress事件来使文本响应点击、长按事件。

除了初始化属性字符串对象即初始样式对象，亦可通过setStyle接口再叠加新样式或更新已有样式，同时需要在附加的文本组件controller上主动触发更新绑定的属性字符串。

import { drawing } from '@kit.ArkGraphics2D';

let gUIContext: UIContext;

class MyCustomSpan extends CustomSpan {
  constructor(word: string, width: number, height: number, fontSize: number) {
    super();
    this.word = word;
    this.width = width;
    this.height = height;
    this.fontSize = fontSize;
  }

  onMeasure(measureInfo: CustomSpanMeasureInfo): CustomSpanMetrics {
    return { width: this.width, height: this.height };
  }

  onDraw(context: DrawContext, options: CustomSpanDrawInfo) {
    let canvas = context.canvas;

    const brush = new drawing.Brush();
    brush.setColor({
      alpha: 255,
      red: 0,
      green: 0,
      blue: 0
    });
    const font = new drawing.Font();
    font.setSize(gUIContext.vp2px(this.fontSize));
    const textBlob =
      drawing.TextBlob.makeFromString(this.word.substring(0, 5), font, drawing.TextEncoding.TEXT_ENCODING_UTF8);
    canvas.attachBrush(brush);

    this.onDrawRectByRadius(context, options.x, options.x + gUIContext.vp2px(this.width), options.lineTop,
      options.lineBottom, 20);
    brush.setColor({
      alpha: 255,
      red: 255,
      green: 255,
      blue: 255
    });
    canvas.attachBrush(brush);
    canvas.drawTextBlob(textBlob, options.x, options.lineBottom - 30);
    brush.setColor({
      alpha: 255,
      red: 255,
      green: 228,
      blue: 196
    });
    canvas.attachBrush(brush);
    const textBlob1 =
      drawing.TextBlob.makeFromString(this.word.substring(5), font, drawing.TextEncoding.TEXT_ENCODING_UTF8);
    canvas.drawTextBlob(textBlob1, options.x + gUIContext.vp2px(100), options.lineBottom - 30);

    canvas.detachBrush();
  }

  onDrawRectByRadius(context: DrawContext, left: number, right: number, top: number, bottom: number, radius: number) {
    let canvas = context.canvas;
    let path = new drawing.Path();

    // 画带radius的rect
    path.moveTo(left + radius, top);
    path.lineTo(right - radius, top);
    path.arcTo(right - 2 * radius, top, right, top + 2 * radius, 270, 90);
    path.lineTo(right, bottom - radius);
    path.arcTo(right - 2 * radius, bottom - 2 * radius, right, bottom, 0, 90);

    path.lineTo(left + 2 * radius, bottom);
    path.arcTo(left, bottom - 2 * radius, left + 2 * radius, bottom, 90, 90);
    path.lineTo(left, top + 2 * radius);
    path.arcTo(left, top, left + 2 * radius, top + 2 * radius, 180, 90);

    canvas.drawPath(path);
  }

  setWord(word: string) {
    this.word = word;
  }

  public width: number = 160;
  public word: string = 'drawing';
  public height: number = 10;
  public fontSize: number = 16;
}

@Entry
@Component
struct StyledStringGestureStyle {
  customSpan3: MyCustomSpan = new MyCustomSpan('99VIP88%off', 200, 40, 30);
  customSpanStyledString: MutableStyledString = new MutableStyledString(this.customSpan3);
  textController: TextController = new TextController();
  isPageShow: boolean = true;
  @State backgroundColor1: ResourceColor | undefined = undefined;
  gestureStyleAttr: GestureStyle = new GestureStyle({
    onClick: () => {
      this.backgroundColor1 = Color.Green;
    },
    onLongPress: () => {
      this.backgroundColor1 = Color.Grey;
    }
  });

  aboutToAppear() {
    gUIContext = this.getUIContext();
  }

  async onPageShow() {
    if (!this.isPageShow) {
      return;
    }
    this.isPageShow = false;
    this.customSpanStyledString.setStyle({
      start: 0,
      length: 1,
      styledKey: StyledStringKey.GESTURE,
      styledValue: this.gestureStyleAttr
    })
    this.textController.setStyledString(this.customSpanStyledString);
  }

  build() {
    NavDestination() {
      Column({ space: 12 }) {
        // ...
          Row() {
            Column() {
              // 请将$r('app.string.StyledStringGestureStyle_button_content')替换为实际资源文件，在本示例中该资源文件的value值为"响应属性字符串事件改变背景色"
              Button($r('app.string.StyledStringGestureStyle_button_content'))
                .backgroundColor(this.backgroundColor1)
                .width('80%')
                .margin(10)
              Text(undefined, { controller: this.textController })
                .id('text1')
                .copyOption(CopyOptions.InApp)
                .fontSize(30)
            }
            .width('100%')
          }
          .height('100%')
        }
        // ...
    }
    .backgroundColor('#f1f2f3')
    // 请将$r('app.string.StyledStringGestureStyle_title')替换为实际资源文件，在本示例中该资源文件的value值为"设置事件"
    .title($r('app.string.StyledStringGestureStyle_title'))
  }
}

格式转换

可以通过toHtml、fromHtml接口实现属性字符串与HTML格式字符串的相关转换，支持转换的HTML标签部分范围：、、<img>、 、、、<a>、、、<s>、、<del>、、，完整范围参见fromHtml的接口说明。

以下示例展示了如何将属性字符串转换成HTML格式，并展示了如何从HTML格式转换回属性字符串。

// xxx.ets
import { image } from '@kit.ImageKit';
import { LengthMetrics } from '@kit.ArkUI';
import { hilog } from '@kit.PerformanceAnalysisKit';

@Entry
@Component
struct StyledStringHtml {
  imagePixelMap: image.PixelMap | undefined = undefined;
  @State html: string | undefined = undefined;
  @State styledString: StyledString | undefined = undefined;
  controller1: TextController = new TextController;
  controller2: TextController = new TextController;
  private uiContext: UIContext = this.getUIContext();

  async aboutToAppear() {
    hilog.info(0x0000, 'testTag', 'aboutToAppear initial imagePixelMap');
    this.imagePixelMap = await this.getPixmapFromMedia($r('app.media.startIcon'));
  }

  private async getPixmapFromMedia(resource: Resource) {
    try {
      let unit8Array = await this.uiContext.getHostContext()?.resourceManager?.getMediaContent(resource.id);
      let imageSource = image.createImageSource(unit8Array?.buffer?.slice(0, unit8Array?.buffer?.byteLength));
      let createPixelMap: image.PixelMap = await imageSource.createPixelMap({
        desiredPixelFormat: image.PixelMapFormat.RGBA_8888
      });
      await imageSource.release();
      return createPixelMap;
    } catch (error) {
      hilog.error(0x0000, 'testTag', `Get Pixmap failed. error code: ${error.code}, error message: ${error.message}`);
    }
    return undefined;
  }

  build() {
    NavDestination() {
      Column({ space: 12 }) {
        // ...
          Column() {
            Text(undefined, { controller: this.controller1 }).height(100)
            Row() {
              // 请将$r('app.string.StyledStringHtml_Button_1')替换为实际资源文件，在本示例中该资源文件的value值为"添加属性字符串"
              Button($r('app.string.StyledStringHtml_Button_1')).onClick(() => {
                // 请将$r('app.string.StyledStringHtml_Text_1')替换为实际资源文件，在本示例中该资源文件的value值为"属性字符串"
                let mutableStyledString1: MutableStyledString =
                  new MutableStyledString(this.getUIContext()
                    .getHostContext()!.resourceManager.getStringSync($r('app.string.StyledStringHtml_Text_1').id), [{
                  start: 0,
                  length: 6,
                  styledKey: StyledStringKey.FONT,
                  styledValue: new TextStyle({ fontColor: Color.Green, fontSize: LengthMetrics.px(50) })
                }]);
                if (this.imagePixelMap !== undefined) {
                  let mutableStyledString2 = new MutableStyledString(new ImageAttachment({
                    value: this.imagePixelMap,
                    size: { width: 50, height: 50 },
                  }));
                  mutableStyledString1.appendStyledString(mutableStyledString2);
                }
                this.styledString = mutableStyledString1;
                this.controller1.setStyledString(mutableStyledString1);
              }).margin(5)
              // 请将$r('app.string.StyledStringHtml_Button_2')替换为实际资源文件，在本示例中该资源文件的value值为"toHtml"
              Button($r('app.string.StyledStringHtml_Button_2')).onClick(() => {
                this.html = StyledString.toHtml(this.styledString);
              }).margin(5)
              // 请将$r('app.string.StyledStringHtml_Button_3')替换为实际资源文件，在本示例中该资源文件的value值为"fromHtml"
              Button($r('app.string.StyledStringHtml_Button_3')).onClick(async () => {
                let styledString = await StyledString.fromHtml(this.html);
                this.controller2.setStyledString(styledString);
              }).margin(5)
            }

            Text(undefined, { controller: this.controller2 }).height(100)
            Text(this.html)
          }.width('100%')
        }
        // ...
    }
    .backgroundColor('#f1f2f3')
    // 请将$r('app.string.StyledStringHtml_title')替换为实际资源文件，在本示例中该资源文件的value值为"格式转换"
    .title($r('app.string.StyledStringHtml_title'))
  }
}

将HTML中、、<a>、、、<s>、、<del>、、标签及其style属性中的background-color转换为属性字符串并转回HTML。

// xxx.ets
@Entry
@Component
struct HtmlSpanStringDemo {
  @State html: string =
    "<p>This is <b>b</b> <strong>strong</strong> <em>em</em> <i>i</i> <u>u</u> <del>del</del> <s>s</s> <span style =   \"foreground-color:blue\"> <a href='https://www.example.com'>www.example</a> </span> <span   style=\"background-color: red;\">red span</span> <sup>superscript</sup> and <sub>subscript</sub></p>";
  @State spanString: StyledString | undefined = undefined;
  @State resultText: string = ''; // 保存结果文本的状态
  controller: TextController = new TextController;

  build() {
    Column() {
      // 显示转换后的spanString
      Text(undefined, { controller: this.controller }).height(100).id('text1')

      // TextArea显示每个步骤的结果
      TextArea({ text: this.html })
        .width('100%')
        .height(100)
        .margin(5)

      // 按钮1:将HTML转换为SpanString
      // 请将$r('app.string.Converted_HTML_to_SpanString')替换为实际资源文件，在本示例中该资源文件的value值为"Converted HTML to SpanString"
      Button($r('app.string.Converted_HTML_to_SpanString')).onClick(async () => {
        this.spanString = await StyledString.fromHtml(this.html);
        this.controller.setStyledString(this.spanString);
        this.resultText = 'Converted HTML to SpanString successfully.';
      }).margin(5)

      // 按钮2:将SpanString转换为HTML
      // 请将$r('app.string.Converted_SpanString_to_HTML')替换为实际资源文件，在本示例中该资源文件的value值为"Converted SpanString to HTML"
      Button($r('app.string.Converted_SpanString_to_HTML')).onClick(() => {
        if (this.spanString) {
          // 将spanString转换为HTML并替换当前的HTML状态
          const newHtml = StyledString.toHtml(this.spanString);
          if (newHtml !== this.html) { // 通过检查内容是否已经相同来防止重复
            this.html = newHtml;
          }
          this.resultText = 'Converted SpanString to HTML successfully.';
        } else {
          this.resultText = 'SpanString is undefined.';
        }
      }).margin(5)

      // 按钮3:将HTML转换回SpanString
      /* 请将$r('app.string.Converted_HTML_back_to_SpanString')替换为实际资源文件，在本示例中该资源文件的
       * value值为"Converted HTML back to SpanString"
       */
      Button($r('app.string.Converted_HTML_back_to_SpanString')).onClick(async () => {
        this.spanString = await StyledString.fromHtml(this.html);
        this.controller.setStyledString(this.spanString);
        this.resultText = 'Converted HTML back to SpanString successfully.';
      }).margin(5)

      // 重置：重置HTML和SpanString
      // 请将$r('app.string.Reset')替换为实际资源文件，在本示例中该资源文件的value值为"Reset"
      Button($r('app.string.Reset')).onClick(() => {
        this.html =
          "<p>This is <b>b</b> <strong>strong</strong> <em>em</em> <i>i</i> <u>u</u> <del>del</del> <s>s</s> <span   style = \"foreground-color:blue\"> <a href='https://www.example.com'>www.example</a> </span> <span   style=\"background-color: red;\">red span</span> <sup>superscript</sup> and <sub>subscript</sub></p>";
        this.spanString = undefined;
        this.controller.setStyledString(new StyledString('')); // 使用空的StyledString实例
        this.resultText = 'Reset HTML and SpanString successfully.';
      }).margin(5)
    }.width('100%').padding(20)
  }
}

场景示例

该示例通过ParagraphStyle、LineHeightStyle、TextStyle对象展示了会员过期提示的效果。

import { LengthMetrics } from '@kit.ArkUI';

@Entry
@Component
struct StyledStringSceneExample {
  alignCenterParagraphStyleAttr: ParagraphStyle = new ParagraphStyle({ textAlign: TextAlign.Center });
  // 行高样式对象
  lineHeightStyle1: LineHeightStyle = new LineHeightStyle(LengthMetrics.vp(24));
  // Bold样式
  boldTextStyle: TextStyle = new TextStyle({ fontWeight: FontWeight.Bold });
  // 创建含段落样式的对象paragraphStyledString1
  // 请将$r('app.string.StyledStringSceneExample_Text_1')替换为实际资源文件，在本示例中该资源文件的value值为"您的豪华钻石已过期1天\n续费可继续享受会员专属权益"
  paragraphStyledString1: MutableStyledString =
    new MutableStyledString(this.getUIContext()
      .getHostContext()!.resourceManager.getStringSync($r('app.string.StyledStringSceneExample_Text_1').id), [
      {
        start: 0,
        length: 4,
        styledKey: StyledStringKey.PARAGRAPH_STYLE,
        styledValue: this.alignCenterParagraphStyleAttr
      },
      {
        start: 0,
        length: 4,
        styledKey: StyledStringKey.LINE_HEIGHT,
        styledValue: new LineHeightStyle(LengthMetrics.vp(40))
      },
      {
        start: 11,
        length: 14,
        styledKey: StyledStringKey.FONT,
        styledValue: new TextStyle({ fontSize: LengthMetrics.vp(14), fontColor: Color.Grey })
      },
      {
        start: 11,
        length: 4,
        styledKey: StyledStringKey.PARAGRAPH_STYLE,
        styledValue: this.alignCenterParagraphStyleAttr
      },
      {
        start: 11,
        length: 4,
        styledKey: StyledStringKey.LINE_HEIGHT,
        styledValue: this.lineHeightStyle1
      }
    ]);
  // 请将$r('app.string.StyledStringSceneExample_Text_2')替换为实际资源文件，在本示例中该资源文件的value值为"\n￥4.88￥15"
  paragraphStyledString2: MutableStyledString =
    new MutableStyledString(this.getUIContext()
      .getHostContext()!.resourceManager.getStringSync($r('app.string.StyledStringSceneExample_Text_2').id), [
    {
      start: 0,
      length: 4,
      styledKey: StyledStringKey.PARAGRAPH_STYLE,
      styledValue: this.alignCenterParagraphStyleAttr
    },
    {
      start: 0,
      length: 4,
      styledKey: StyledStringKey.LINE_HEIGHT,
      styledValue: new LineHeightStyle(LengthMetrics.vp(60))
    },
    {
      start: 0,
      length: 6,
      styledKey: StyledStringKey.FONT,
      styledValue: this.boldTextStyle
    },
    {
      start: 1,
      length: 1,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontSize: LengthMetrics.vp(18) })
    },
    {
      start: 2,
      length: 4,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontSize: LengthMetrics.vp(40) })
    },
    {
      start: 6,
      length: 3,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontColor: Color.Grey, fontSize: LengthMetrics.vp(14) })
    },
    {
      start: 6,
      length: 3,
      styledKey: StyledStringKey.DECORATION,
      styledValue: new DecorationStyle({ type: TextDecorationType.LineThrough, color: Color.Grey })
    }
  ]);
  // 请将$r('app.string.StyledStringSceneExample_Text_3')替换为实际资源文件，在本示例中该资源文件的value值为"\n02时06分后将失去该优惠"
  paragraphStyledString3: MutableStyledString =
    new MutableStyledString(this.getUIContext()
      .getHostContext()!.resourceManager.getStringSync($r('app.string.StyledStringSceneExample_Text_3').id), [
    {
      start: 0,
      length: 4,
      styledKey: StyledStringKey.PARAGRAPH_STYLE,
      styledValue: this.alignCenterParagraphStyleAttr
    },
    {
      start: 0,
      length: 4,
      styledKey: StyledStringKey.LINE_HEIGHT,
      styledValue: new LineHeightStyle(LengthMetrics.vp(30))
    },
    {
      start: 1,
      length: 2,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontColor: '#FFD700', fontWeight: FontWeight.Bold })
    },
    {
      start: 4,
      length: 2,
      styledKey: StyledStringKey.FONT,
      styledValue: new TextStyle({ fontColor: '#FFD700', fontWeight: FontWeight.Bold })
    }
  ]);
  controller: TextController = new TextController();

  build() {
    NavDestination() {
      Column({ space: 12 }) {
        // ...
          Row() {
            Column({ space: 5 }) {
              Text(undefined, { controller: this.controller })
                .id('text1')
                .width(240)
                .copyOption(CopyOptions.InApp)
                .draggable(true)
                .onAppear(() => {
                  this.paragraphStyledString2.appendStyledString(this.paragraphStyledString3);
                  this.paragraphStyledString1.appendStyledString(this.paragraphStyledString2);
                  this.controller.setStyledString(this.paragraphStyledString1);
                })
              // 请将$r('app.string.StyledStringSceneExample_Button_1')替换为实际资源文件，在本示例中该资源文件的value值为"限时4.88元 立即续费"
              Button($r('app.string.StyledStringSceneExample_Button_1'))
                .width(200)
                .fontColor(Color.White)
                .fontSize(18)
                .backgroundColor('#3CB371')
                .margin({ bottom: 10 })
            }
            .borderWidth(1).borderColor('#FFDEAD')
            .margin({ left: 10 })
          }
          .height('60%')
        }
        // ...
    }
    .backgroundColor('#f1f2f3')
    // 请将$r('app.string.StyledStringSceneExample_title')替换为实际资源文件，在本示例中该资源文件的value值为"场景示例"
    .title($r('app.string.StyledStringSceneExample_title'))
  }
}

目录

属性字符串 (StyledString/MutableStyledString)