ref |> 临时解决评论内容带折行且超过3行时 无法展开收起问题

Signed-off-by: xugenyuan <xugenyuan@wondertek.com.cn>

@@ -6,8 +6,10 @@ import display from '@ohos.display';
 const collapseString = '...展开全文'
 const uncollapseString = '...收起'
 
+const TestLongText = "超过三行超\n过三行超过\n三行超超过三行\n超过三行超过三行超过三\n行超过"
+
 @Component
-@Preview
+// @Preview
 export struct CommentText {
   // 长文本
   @State longMessage: string = ''
@@ -26,6 +28,7 @@ export struct CommentText {
   @State expandedStates: boolean = false;
   @State fontSize: number = 18;
   @State fontWeight: FontWeight = FontWeight.Regular
+  @State lineHeight: number = 24
   fontColor: ResourceColor = $r('app.color.color_222222')
   // 测量文本宽度（单位px）
   @State textWidth: number = 0;
@@ -37,6 +40,8 @@ export struct CommentText {
   promise: Promise<Array<display.Display>> = display.getAllDisplays()
 
   aboutToAppear() {
+    // this.longMessage = TestLongText
+
     console.log(`文本宽度为：${this.textWidth}`)
     let padding = vp2px(5 + this.marginWidth)
 
@@ -58,6 +63,17 @@ export struct CommentText {
       this.isExpanded = (this.screenWidth - padding) * this.lines <= this.textWidth
       // this.expandedStates = this.isExpanded;
 
+      let lines = this.getTextLineNum(
+        this.longMessage,
+        (this.screenWidth - padding),
+        this.lineHeight,
+        this.fontSize,
+        this.fontWeight
+      )
+      if (lines > 3) {
+        this.isExpanded = true
+      }
+
       //需要展开的话计算3行需要显示的文字
       if (this.isExpanded) {
 
@@ -76,13 +92,25 @@ export struct CommentText {
             wordBreak:WordBreak.BREAK_ALL
           })
 
+          let size = this.topMeasureText(
+            string,
+            (this.screenWidth - padding),
+            this.lineHeight,
+            this.fontSize,
+            this.fontWeight,
+            WordBreak.BREAK_ALL)
+          let height: number = Number(size.height)
+          let lines = Math.ceil(px2vp(height) / this.lineHeight)
+
           //计算有误差20
 
-          if (thisTextWidth >= maxLineTextWidth) {
+          if (thisTextWidth >= maxLineTextWidth || lines > 3) {
+            // if (this.maxLineMesssage.endsWith('\n')) {
+            //   this.maxLineMesssage = this.maxLineMesssage.slice(0, this.maxLineMesssage.length - 1)
+            // }
             break
           }
           this.maxLineMesssage = element;
-
         }
       }
 
@@ -152,6 +180,24 @@ export struct CommentText {
 
     // .height('100%')
   }
+
+  // 获取文本几行
+  private getTextLineNum(text: string, constraintWidth: number, lineHeight: number, fontSize: number | string | Resource, fontWeight: FontWeight) {
+    let size = this.topMeasureText(text, constraintWidth, lineHeight, fontSize, fontWeight)
+    let height: number = Number(size.height)
+    return Math.ceil(px2vp(height) / lineHeight)
+  }
+
+  private topMeasureText(text: string, constraintWidth: number, lineHeight: number, fontSize: number | string | Resource, fontWeight: FontWeight, wordBreak?: WordBreak) {
+    return measure.measureTextSize({
+      textContent: text,
+      fontSize: fontSize,
+      lineHeight: lineHeight,
+      constraintWidth: constraintWidth,
+      fontWeight: fontWeight,
+      wordBreak: wordBreak,
+    })
+  }
 }
 
 
@@ -161,7 +207,11 @@ export struct CommentText {
 struct Index {
   build() {
     Column() {
-      CommentText()
+      CommentText({longMessage: TestLongText,
+        maxline: 3,
+        fontSize: 14,
+        fontWeight: FontWeight.Regular,
+        marginWidth: (95 + 16)})
     }
   }
 }
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