Flutter Widget 之StatefulBuilder构建方法详解_Android

bool isExpanded = false;
Widget build(context) {
    return Column(
        children: [
            InexpendsiveStateful(
                isExpanded: isExpanded,
                onTap: (bool newValue) => setState(() => isExpanded = val),
            ),
            ExpensiveStateless(),
        ]
    );
}

bool isExpanded = falise;
Widger build(context) {
    return Column(
        children: [
            StatefulBuilder(
                builder: (ctx, setState) => 
                    InexpensiveStateful(
                        isExpanded: isExpanded,
                        onTap: (bool newValue) => setState(() => isExpanded = val),
                    )
            ),
            ExpensiveStateless(),
        ]
    );
}