Moyo: グリッド表示

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    return SafeArea(
      child: LayoutBuilder(
        builder: (BuildContext context, BoxConstraints constraints) {
          return Container(
            child: CustomPaint(
              painter: _MyPainter(
                width: constraints.maxWidth,
                height: constraints.maxHeight,
              ),
            ),
          );
        },
      ),
    );