class ImageListScreen extends Screen<Image> {
    public render() {
        return (
            <Fragment>
                <List id="list" onSelect={this.onSelectImage} /> // toute la liste des images
            </Fragment>
        )
    }

    private onSelectImage(event: Event) {
        this.result = trouveLeDataAvecLindex(event.data.index)
        this.dismiss()
    }
}


class ImagePickerScreen extends Screen {

    public render() {
        return (
            <Fragment>
                <Button label="Pick image" onPress={this.pick} />
            </Fragment>
        )
    }

    private async pick() {
        let image = await this.prompt(new ImageListScreen, 'cover')
        console.log('J'ai une image')
    }
}