feat(tab)：顶部tab切换同步

@@ -58,6 +58,11 @@ export struct TopNavigationComponent {
   // 当前底导index
   @State navIndex: number = 0
 
+  @State animationDuration: number = 0
+  @State indicatorLeftMargin: number = 0
+  @State indicatorWidth: number = 0
+  private tabsWidth: number = 0
+
   topOrBottomNavChange() {
     if (this.currentBottomNavName === this.currentBottomNavInfo?.name) {
       this.setBarBackgroundColor()
@@ -162,6 +167,7 @@ export struct TopNavigationComponent {
     return item.name === '版面'
   }
 
+
   build() {
     Column() {
       // 顶部搜索、日报logo、早晚报
@@ -237,9 +243,13 @@ export struct TopNavigationComponent {
         .barMode(BarMode.Scrollable)
         .vertical(false)
         .barBackgroundColor(this.barBackgroundColor)
+        .onAreaChange((oldValue: Area,newValue: Area)=> {
+          let width = Number.parseFloat(newValue.width.toString())
+          this.tabsWidth = Number.isNaN(width) ? 0 : width
+        })
+        .animationDuration(this.animationDuration)
         .onChange((index: number) => {
           this.currentTopNavName = this._currentNavIndex === 0 ? this.myChannelList[index].name : this.topNavList[index].name
-
           Logger.info(TAG, `onChange index : ${index}`);
           if (!this.isBroadcast(this._currentNavIndex === 0 ? this.myChannelList[index] : this.topNavList[index]) &&
             !this.isLayout(this._currentNavIndex === 0 ? this.myChannelList[index] : this.topNavList[index])
@@ -256,6 +266,39 @@ export struct TopNavigationComponent {
             this.tabsController.changeIndex(this.currentTopNavSelectedIndex)
           }
         })
+        .onAnimationStart((index: number, targetIndex: number, event: TabsAnimationEvent) => {
+          if (!this.isBroadcast(this._currentNavIndex === 0 ? this.myChannelList[index] : this.topNavList[index]) &&
+            !this.isLayout(this._currentNavIndex === 0 ? this.myChannelList[index] : this.topNavList[index])
+          ) {
+            return
+          }
+          this.currentTopNavSelectedIndex = targetIndex
+          // 切换动画开始时触发该回调。下划线跟着页面一起滑动，同时宽度渐变。
+          let targetIndexInfo = this.getTextInfo(targetIndex)
+          this.startAnimateTo(this.animationDuration, targetIndexInfo.left, targetIndexInfo.width)
+        })
+        .onAnimationEnd((index: number,event: TabsAnimationEvent) => {
+          if (!this.isBroadcast(this._currentNavIndex === 0 ? this.myChannelList[index] : this.topNavList[index]) &&
+            !this.isLayout(this._currentNavIndex === 0 ? this.myChannelList[index] : this.topNavList[index])
+          ) {
+            return
+          }
+            // 切换动画结束时触发该回调。下划线动画停止。
+            let currentIndicatorInfo = this.getCurrentIndicatorInfo(index,event)
+            this.startAnimateTo(0,currentIndicatorInfo.left,currentIndicatorInfo.width)
+        })
+        .onGestureSwipe((index: number,event: TabsAnimationEvent) => {
+          if (!this.isBroadcast(this._currentNavIndex === 0 ? this.myChannelList[index] : this.topNavList[index]) &&
+            !this.isLayout(this._currentNavIndex === 0 ? this.myChannelList[index] : this.topNavList[index])
+          ) {
+            return
+          }
+            // 在页面跟手滑动过程中，逐帧触发该回调。
+            let currentIndicatorInfo = this.getCurrentIndicatorInfo(index,event)
+            this.currentTopNavSelectedIndex = currentIndicatorInfo.index
+            this.indicatorLeftMargin = currentIndicatorInfo.left
+            this.indicatorWidth = currentIndicatorInfo.width
+        })
 
         // 分类列表最右侧频道设置
         if (this._currentNavIndex === 0) {
@@ -296,6 +339,17 @@ export struct TopNavigationComponent {
         .fontColor(this.getTopNavFontColor(item, index))
         .padding({ top: $r('app.float.top_tab_item_padding_top'), bottom: $r('app.float.top_tab_item_padding_bottom') })
         .maxLines(this.MAX_LINE)
+        .id(index.toString())
+        .onAreaChange((oldValue: Area,newValue: Area) => {
+          if (this.currentTopNavSelectedIndex === index && (this.indicatorLeftMargin === 0 || this.indicatorWidth === 0)){
+            if (newValue.position.x != undefined) {
+              let positionX = Number.parseFloat(newValue.position.x.toString())
+              this.indicatorLeftMargin = Number.isNaN(positionX) ? 0 : positionX
+            }
+            let width = Number.parseFloat(newValue.width.toString())
+            this.indicatorWidth = Number.isNaN(width) ? 0 : width
+          }
+        })
       // .backgroundImage(this.currentTopNavSelectedIndex === index ? item.iconCUrl : item.iconUrl)
       if (this.currentTopNavSelectedIndex === index) {
         Row()
@@ -418,4 +472,46 @@ export struct TopNavigationComponent {
     }
     return null
   }
+
+  private getTextInfo(index: number): Record<string, number> {
+    let strJson = getInspectorByKey(index.toString())
+    try {
+      let obj: Record<string, string> = JSON.parse(strJson)
+      let rectInfo: number[][] = JSON.parse('[' + obj.$rect + ']')
+      return { 'left': px2vp(rectInfo[0][0]), 'width': px2vp(rectInfo[1][0] - rectInfo[0][0]) }
+    } catch (error) {
+      return { 'left': 0, 'width': 0 }
+    }
+  }
+
+  private getCurrentIndicatorInfo(index: number, event: TabsAnimationEvent): Record<string, number> {
+    let nextIndex = index
+    if (index > 0 && event.currentOffset > 0) {
+      nextIndex--
+    } else if (index < 3 && event.currentOffset < 0) {
+      nextIndex++
+    }
+    let indexInfo = this.getTextInfo(index)
+    let nextIndexInfo = this.getTextInfo(nextIndex)
+    let swipeRatio = Math.abs(event.currentOffset / this.tabsWidth)
+    let currentIndex = swipeRatio > 0.5 ? nextIndex : index  // 页面滑动超过一半，tabBar切换到下一页。
+    let currentLeft = indexInfo.left + (nextIndexInfo.left - indexInfo.left) * swipeRatio
+    let currentWidth = indexInfo.width + (nextIndexInfo.width - indexInfo.width) * swipeRatio
+    return { 'index': currentIndex, 'left': currentLeft, 'width': currentWidth }
+  }
+
+  private startAnimateTo(duration: number, leftMargin: number, width: number) {
+    animateTo({
+      duration: duration, // 动画时长
+      curve: Curve.Linear, // 动画曲线
+      iterations: 1, // 播放次数
+      playMode: PlayMode.Normal, // 动画模式
+      onFinish: () => {
+        console.info('play end')
+      }
+    }, () => {
+      this.indicatorLeftMargin = leftMargin
+      this.indicatorWidth = width
+    })
+  }
 }
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