Invalidate cached image?

[kbrmimbyl]

Is there a way to force-invalidate a given cached image?

[wiradikusuma]

+1

[renefloor]

There is now.

[Xgamefactory]

There is now.
how ?

[renefloor]

@Xgamefactory if you import flutter_cache_manager you can call DefaultCacheManager().removeFile(String url) or DefaultCacheManager(). emptyCache()

[jagmit]

@renefloor Thanks for this hint! Removing the entry from the cache with DefaultCacheManager().removeFile() and causing the CachedNetworkImage to rebuild does cause a new fetching of the image over network.

Prior to 3f59818 this might could have been fixed by additionally checking whether the CacheManager still got the file in memory.

  @override
  void didUpdateWidget(CachedNetworkImage oldWidget) {
    if (oldWidget.imageUrl != widget.imageUrl || _cacheManager.getFileFromMemory(imageUrl) == null) {
      _streamBuilderKey = UniqueKey();
      if (!widget.useOldImageOnUrlChange) {
        _disposeImageHolders();
        _imageHolders.clear();
      }
      _createFileStream();
    }
    super.didUpdateWidget(oldWidget);
  }

I don't know how to do this with the new OctoImage widget. Can you look into this?

[renefloor]

@jagmit 'evict' should work: https://api.flutter.dev/flutter/painting/ImageProvider/evict.html
So await CachedNetworkImageProvider(url).evict() after DefaultCacheManager().removeFile().

[jagmit]

@renefloor Thank you for your quick reply. Evicting the image from the ImageProvider still doesn't cause the image to refetch when rebuilding the widget after the cache eviction.
Maybe the didUpdateWidget in OctoImage is the problem here?

[renefloor]

Have to test that, but I at least see an issue there on this line: https://github.com/Baseflow/octo_image/blob/8c33667cb5a7593651a1085edd299eb38d73be32/lib/src/image.dart#L313

[jagmit]

Were you able to reproduce it or should I try to provide an example project with this issue?

[renefloor]

Didn't have time for it yet, but an example is always nice to speed things up.