public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value is Character character)
{
var source = new CustomStreamImageSource
{
// FFImageLoading uses a unique key value to cache the image, I use the data item's ID
Key = character.Id.ToString(),
Stream = (token) => Task.FromResult(_client.GetStreamAsync(character.Image.ThumbUrl).Result)
};
// this will be returned to the CachedImage instance
return(source);
}
return(null);
}
public async override void OnNavigatedTo(INavigationParameters parameters)
{
base.OnNavigatedTo(parameters);
if (parameters.ContainsKey("ImageInfos"))
{
parameters.TryGetValue("ImageInfos", out List <string> images);
foreach (var url in images)
{
try
{
var config = new FFImageLoading.Config.Configuration()
{
ExecuteCallbacksOnUIThread = true
};
byte[] byteArray;
CacheStream cacheStream = null;
try
{
cacheStream = await ImageService.Instance.Config.DownloadCache.DownloadAndCacheIfNeededAsync(url,
ImageService.Instance.LoadUrl(url),
ImageService.Instance.Config,
CancellationToken.None);
}
catch (Exception)
{
var timg = "Wesley.Client.Resources/images/loading.gif";
cacheStream = await ImageService.Instance.Config.DownloadCache.DownloadAndCacheIfNeededAsync(timg,
ImageService.Instance.LoadUrl(timg),
ImageService.Instance.Config,
CancellationToken.None);
}
if (cacheStream != null)
{
using (cacheStream.ImageStream)
using (var memoryStream = new MemoryStream())
{
await cacheStream.ImageStream.CopyToAsync(memoryStream);
byteArray = memoryStream.ToArray();
}
var tp = new CustomStreamImageSource()
{
Key = url,
Stream = (token) => Task.FromResult <Stream>(new MemoryStream(byteArray))
};
ImagesUrls.Add(tp);
}
}
catch (Exception)
{
}
}
;
if (ImagesUrls.Count > 0)
{
this.ImagesUrls = new ObservableRangeCollection <ImageSource>(ImagesUrls);
}
}
}
