HarmonyOS 字符串包含另外一个字符串，把包含的字符串高亮？

Question

我要做一个搜索功能，搜索出来的结果匹配关键词，就标记高亮。这个功能怎么实现呢？

Answer 1

class Tmp {
  a: MutableStyledString
  b: TextController
  c: string
  constructor(a: MutableStyledString, b: TextController, c: string) {
    this.c = c
    this.a = a
    this.b = b
  }
};

@Entry
@Component
struct Page248264 {
  @State searchValue: string = '';
  @State dataArr: string[] =
    ["diyi第一段a数据", "第二段ab数据", "第三段b数据", "第四d段数据", "第五cd段数据", "第六段数据"]
  @State showArr: Tmp[] = []
  count: number = 0
  fontStyleAttr1: TextStyle = new TextStyle({ fontColor: Color.Red });
  fontStyleAttr2: TextStyle = new TextStyle({ fontColor: Color.Blue });
  mutableStyledString2: MutableStyledString = new MutableStyledString("test hello world", [{
    start: 0,
    length: 5,
    styledKey: StyledStringKey.FONT,
    styledValue: this.fontStyleAttr1
  }]);
  controller3: TextController = new TextController();

  build() {
    Row() {
      Column() {
        Search({ value: $$this.searchValue, placeholder: 'Type to search...' })
          .searchButton('SEARCH')
          .width('90%')
          .height(40)
          .backgroundColor('#F5F5F5')
          .placeholderColor(Color.Grey)
          .placeholderFont({ size: 14, weight: 400 })
          .textFont({ size: 14, weight: 400 })
          .margin(20)
          .onChange(() => {
            this.showArr = []
            this.controller3.setStyledString(this.mutableStyledString2)
            this.dataArr.filter((item: string) => {
              let index = item.indexOf(this.searchValue)
              if (this.searchValue && index != -1) {
                // MutableStyledString 要高亮的是列表，多关键字匹配的场景在里面加属性就可以
                let mutableStyledString = new MutableStyledString(item, [{
                  start: index,
                  length: this.searchValue.length,
                  styledKey: StyledStringKey.FONT,
                  styledValue: this.fontStyleAttr1
                }, {
                  start: item.length - 1,
                  length: 1,
                  styledKey: StyledStringKey.FONT,
                  styledValue: this.fontStyleAttr2
                }])
                let controller = new TextController()
                this.count += 1
                this.showArr.push(new Tmp(mutableStyledString, controller, this.count.toString()))
                console.log("mutableStyledString comntent:" + mutableStyledString.getString() + this.showArr.length);
              }
            })
          })
        ForEach(this.showArr, (item: Tmp) => {
          ListItem() {
            Row() {
              Text(undefined, { controller: item.b }).onAppear(() => {
                item.b.setStyledString(item.a)
              })
            }.width("100%").height(40).justifyContent(FlexAlign.Center)
          }
        }, (item: Tmp) => item.c)
      }.width('100%')
    }.height('100%')
  }
}