build method

@override Widget build(BuildContext context)

Builds the widget subtree for this state.

Implementation

@override
Widget build(BuildContext context) {
  if (_entries.isEmpty) return SizedBox.shrink();

  // Find the lowest entry we need to render: start from the last opaque
  // entry and include everything from there upward.
  var startIndex = 0;
  for (var i = _entries.length - 1; i >= 0; i--) {
    if (_entries[i].opaque) {
      startIndex = i;
      break;
    }
  }

  final children = <Widget>[];
  for (var i = startIndex; i < _entries.length; i++) {
    final entry = _entries[i];
    // Skip entries below an opaque entry that don't maintain state.
    if (i < startIndex && !entry.maintainState) continue;
    children.add(entry.builder(context));
  }

  if (children.isEmpty) return SizedBox.shrink();

  // Keep the render shape stable as entries are inserted/removed so
  // descendants (for example PopupMenuButton triggers) are not remounted
  // when overlay entry count changes.
  return Stack(fit: StackFit.expand, children: children);
}