Can I call a non-async function asynchronously in Dart?

Question

I want to decode a gif with the image package using DecodeGifAnimation, but it takes too long and causes my webapp to freeze. The library also doesn't seem to have any async methods. I looked up how to do asynchronous processing in Dart, and it seems that I need to use Futures, although I'm not sure how to create one for my function.

Not really sure what I'm doing

void decode(Uint8List data) {
  Future anim = decodeGifAnimation(data); // but it returns Animation, not a Future!
  anim.then(prepare);
}

Günter Zöchbauer · Accepted Answer · 2014-04-29 06:22:40Z

7

void decode(Uint8List data) {
  new Future(() => decodeGifAnimation(data)).then(prepeare);
}

or

Future decode(Uint8List data) {
  return new Future(() => decodeGifAnimation(data)).then(prepeare);
}

if you want to do some async processing when the method returns to call the method like

decode(data).then(xxx);

edited Apr 29, 2014 at 6:22

answered Apr 29, 2014 at 4:01

Günter Zöchbauer

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