feat:preload callbacks

[nicomontanari]

I opened another pull request because the previous one was unexpectedly closed.

@DylanVann I have been using these changes in production for 1 year and everything works fine.

[mathbalduino]

Hey @DylanVann, it would be nice to have this one merged. What do you think?

[lorenzpfei]

@DylanVann can you please merge this? It would be very helpful

[akeva001]

@nicomontanari would you be able to help me on adding this PR to my react native project? I have tried downloading the stable version of react-native-fast-image and applying the necessary changes to the files, but I am not able to get it working.

[akeva001]

@nicomontanari would you be able to help me on adding this PR to my react native project? I have tried downloading the stable version of react-native-fast-image and applying the necessary changes to the files, but I am not able to get it working.

I ended up being able to install it properly I believe,

But this code block is not logging anything,

[sterlingwes]

This PR is missing the runtime change needed in index.tsx, it's still calling the old native module.

Instead replace with:

FastImage.preload = (sources, onProgress, onComplete) =>
    preloaderManager.preload(sources, onProgress, onComplete)

[nicomontanari]

Hi @akeva001, i'm sorry for the delay in my response.

First i added this line in the "dependecies" section in the package.json: "react-native-fast-image": "https://github.com/nicomontanari/react-native-fast-image".

Then this is how i implemented the preload:

import FastImage from 'react-native-fast-image/src'

const preload = async (images: string[]): Promise<void> => {
    return new Promise<void>(async (resolve, reject) => {
        FastImage.preload(
            images.map((image) => ({
                uri: image
            })),
            (finished, total) => {
                if (__DEV__) {
                    console.log('Preload:', `f ${finished}/t ${total}`)
                }
            },
            (_, skipped) => {
                if (skipped > 0) {
                    reject(skipped)
                    if (__DEV__) {
                        console.log('Preload: failed with skipped ', skipped)
                    }
                }
                if (__DEV__) {
                    console.log('Preload: finish')
                }
                resolve()
            }
        )
    })
}

[nicomontanari]

@sterlingwes i'm sorry but i didn't understand your comment. These changes already implement your piece of code.

[sterlingwes]

@nicomontanari if you look in the PR diff here and scroll to the very bottom you'll see that you only have typescript changes in src/index. With no runtime change, the code snippet you shared above is still calling the existing native module method which doesn't do anything with the callback params.

You need to update the index file to pass those params into the method exposed by PreloaderManager which isn't currently used in this diff.

[nicomontanari]

@frg100 @sterlingwes thanks for the tip, I missed these changes along the way 😕