public async Task PreloadImages(float imageWidth)
{
if (hasPreloadedImages)
{
return;
}
hasPreloadedImages = true;
//Lets precach the countries too
#pragma warning disable 4014
GetCountries();
#pragma warning restore 4014
await Task.Factory.StartNew(() => {
var imagUrls = products.SelectMany(x => x.ImageUrls.Select(y => Product.ImageForSize(y, imageWidth))).ToList();
imagUrls.ForEach(async(x) => await FileCache.Download(x));
});
}
public async Task Update(Product product)
{
NameLabel.Text = product.Name;
SizeLabel.Text = product.Size.Description;
ColorLabel.Text = product.Color.Name;
PriceLabel.Text = product.PriceDescription;
var imageTask = FileCache.Download(product.ImageForSize(320));
if (!imageTask.IsCompleted)
{
//Put default before doing the web request;
ImageView.Image = Image.Value;
}
var image = await imageTask;
ImageView.Image = UIImage.FromFile(image);
}
void PrecacheNextImage()
{
if (currentIndex + 1 >= images.Length)
{
cached = true;
}
if (cached)
{
return;
}
var next = currentIndex + 1;
var image = images [next];
//No need to await the precache to finish
#pragma warning disable 4014
FileCache.Download(Product.ImageForSize(image, Images.ScreenWidth));
#pragma warning restore 4014
}
public static async Task <Bitmap> FromUrl(string url)
{
Bitmap bmp;
if (bmpCache.TryGetValue(url, out bmp))
{
return(bmp);
}
var path = await FileCache.Download(url);
if (string.IsNullOrEmpty(path))
{
return(null);
}
bmp = await BitmapFactory.DecodeFileAsync(path);
bmpCache [url] = bmp;
return(bmp);
}
public async void LoadUrl(string url)
{
if (string.IsNullOrEmpty(url))
{
return;
}
var t = FileCache.Download(url);
if (t.IsCompleted)
{
Image = UIImage.FromFile(t.Result);
return;
}
progress.StartAnimating();
var image = UIImage.FromFile(await t);
UIView.Animate(.3,
() => Image = image,
() => progress.StopAnimating());
}
