vscreenFocusNextIndexList property

List<int> get vscreenFocusNextIndexList

Implementation

List<int> get vscreenFocusNextIndexList {
  final current = focusPageCurrentPT;
  if(current != null){
    final currentVScreen = findVirtualScreen(current);
    if(currentVScreen != null){
      final currentSingleNextPT = currentVScreen.vscreenFocusNextIndexList;
      if(currentSingleNextPT.isNotEmpty){
        /// 1.如果翻页成功，则返回 [ 当前指针, ... 翻页递归指针数组 ]
        return [ _currentFocusIndex, ...currentSingleNextPT ];
      }
    }
  }
  /// 2. 如果翻页失败，执行 3.叶子节点 操作
  /// 如果是 叶子节点，3. 检查翻页边界
  final next = focusPageNextPT;
  if(next != null){
    final nextVScreen = findVirtualScreen(next);
    if(nextVScreen != null){
      final currentSingleNode = nextVScreen.vscreenFocusCurrentIndexList;
      if(currentSingleNode.isNotEmpty){
        /// 4. 如果是树枝节点，基于当前节点递归向下执行当前页初始化(RL/LR),返回 [ 翻页指针, ...初始化递归指针数组 ]
        return [ focusPageNextIndex, ...currentSingleNode ];
      }
    }
    /// 5. 如果是叶子节点，返回 [ 翻页指针 ]
    return [ focusPageNextIndex ];
  }
  /// 6. 如果为空表示超越边界，返回 [ 空数组 ]
  return [];
}