HarmonyOS 鸿蒙Next Text组件如何知道当前文本是否已超出maxLines?

请验证下如下代码能否符合您的要求

import measure from '@ohos.measure'
@Entry
@Component
struct MeasurePage {
@State rawTitle: string = "1月16日，国务院新闻办公室举行新闻发布会，介绍2024年春运形势及工作安排。从2月9日（除夕）00：00到2月17日（正月初八）24：00，免费9天。1月16日，国务院新闻办公室举行新闻发布会，介绍2024年春运形势及工作安排"
// @State rawTitle: string = "1月16日，国务院新闻办公室举行新闻发布会"
@State title: string = this.rawTitle // 
@State suffixStr: string = ""
expanded: Boolean = true
titleWidth: number = 350
needProcess: boolean = true
ellipsis: string = "..."
EXPAND_STR: string = "展开"
COLLAPSE_STR: string = "收起"
MAX_LINES: number = 3;
fontSize: number = 16

aboutToAppear(): void {
this.process();
}

process(): void {
if (this.expanded) {
this.collapseText();
} else {
this.expandText();
}
}

//展开文本
expandText(): void {
console.log('testTag: ' + this.needProcess);
if (this.needProcess) {
this.suffixStr = this.COLLAPSE_STR; //收起
this.expanded = true;
this.title = this.rawTitle;
}
}
collapseText(): void {
if (!this.needProcess) {
return;
}
let titleSize : SizeOptions = measure.measureTextSize({
textContent: this.rawTitle,
constraintWidth: this.titleWidth,
fontSize: this.fontSize
})
let twoLineSize : SizeOptions = measure.measureTextSize({
textContent: this.rawTitle,
constraintWidth: this.titleWidth,
fontSize: this.fontSize,
maxLines: this.MAX_LINES
})
//文本未超过限制行数，不进行展开、收起处理
if ((titleSize.height as number) == (twoLineSize.height as number)) {
this.needProcess = false;
return;
}
console.log('test row height:' + titleSize.height)
console.log('test twoLineSize height:' + twoLineSize.height)
let clipTitle: string = this.rawTitle
this.suffixStr = this.EXPAND_STR;
while ((titleSize.height as number) > (twoLineSize.height as number)) {
this.expanded = true;
// 可以修改其他计算算法提高性能
clipTitle = clipTitle.substring(0, clipTitle.length - 1);
titleSize = measure.measureTextSize({
// textContent: clipTitle + this.ellipsis + this.suffixStr,
textContent: clipTitle + this.ellipsis,
constraintWidth: this.titleWidth,
fontSize: this.fontSize
})
console.log("test while clipTitle:" + clipTitle)
console.log("test while clipTitle height:" + titleSize.height)
}
console.log("test clipTitle:" + clipTitle)
this.title = clipTitle + this.ellipsis
this.expanded = false;
}
build() {
Row() {
Column() {
Text(){
Span(this.title)
}
.fontSize(this.fontSize)
.id("title")
.width(this.titleWidth)

if (this.needProcess) {
Text(this.suffixStr)
.fontColor(Color.Orange)
.onClick((event) => {
this.process();
})
}
}
.width('100%')
.alignItems(HorizontalAlign.Start)
}
.height('100%')
}
}