flutter - 在颤动中绘制画布

Question

我正在使用drawDRRect绘制矩形，并希望内部颜色Colors.green和外部颜色Colors.blue如何控制Paint()？

 canvas.drawDRRect(
        RRect.fromRectAndCorners(
            Rect.fromLTWH(
              0,
              0,
              context.size.width,
              36,
            ),
            bottomLeft: Radius.circular(10),
            bottomRight: Radius.circular(10),
            topLeft: Radius.circular(10),
            topRight: Radius.circular(10)),
        RRect.fromRectAndCorners(
            Rect.fromLTRB(canvasStartPosition.dx, 0, canvasEndPosition.dx, 0)),
        Paint()..color = Colors.green);

Answer 1

canvas.drawRRect(
        RRect.fromRectAndCorners(
          Rect.fromLTRB(
            0,
            0,
            canvasStartPosition.dx,
            36,
          ),
          bottomLeft: Radius.circular(10),
          topLeft: Radius.circular(10),
        ),
        new Paint()..color = Colors.blue);
    canvas.drawRRect(
        RRect.fromRectAndCorners(
          Rect.fromLTRB(
            canvasStartPosition.dx,
            0,
            canvasEndPosition.dx,
            36,
          ),
        ),
        new Paint()..color = Colors.green);
    canvas.drawRRect(
        RRect.fromRectAndCorners(
          Rect.fromLTRB(
            canvasEndPosition.dx,
            0,
            context.size.width,
            36,
          ),
          bottomLeft: Radius.circular(10),
          topLeft: Radius.circular(10),
        ),
        new Paint()..color = Colors.blue);