Here is something I managed to achieve:
[![image][1]][1]
Using this code:
Column(
children: [
Material(
child: SizedBox(
width: 200,
height: 30,
),
color: Colors.red,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(2).copyWith(
topLeft: Radius.circular(12),
topRight: Radius.circular(12)
)
),
),
Material(
child: SizedBox(
width: 200,
height: 80,
),
color: Colors.white,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(2).copyWith(
bottomLeft: Radius.circular(12),
bottomRight: Radius.circular(12)
)
),
)
],
),
Hope this helps. Of course you'd need to adjust colors and sizes to the ones you need in your project.
[1]: https://i.stack.imgur.com/16Lo3.png
Just out of curiosity I've taken a look at what happens under the hood, and I've used [dtruss/strace][1] on each test.
C++
./a.out < in
Saw 6512403 lines in 8 seconds. Crunch speed: 814050
syscalls `sudo dtruss -c ./a.out < in`
CALL COUNT
__mac_syscall 1
<snip>
open 6
pread 8
mprotect 17
mmap 22
stat64 30
read_nocancel 25958
Python
./a.py < in
Read 6512402 lines in 1 seconds. LPS: 6512402
syscalls `sudo dtruss -c ./a.py < in`
CALL COUNT
__mac_syscall 1
<snip>
open 5
pread 8
mprotect 17
mmap 21
stat64 29
[1]: http://en.wikipedia.org/wiki/Strace
