Image decode complete notification

[weiminghuaa]

🚀 Feature Requests

Due to some needs of the project, we need to monitor the loading time of pictures, not only downloading, including decoding. That is, we need to know how many times to display a set of pictures, from the begin loading to render complete (rendering monitoring may be difficult, then use the decoding completion time is ok) .

I think the property _isLoaded of ImageHandler is very useful, how to expose it. Actually, we want to use(or get) it in CachedNetworkImage

Contextualize the feature

Describe the feature

Platforms affected (mark all that apply)

• 📱 iOS
• 🤖 Android