public ZoomVM()
{
_indexGenerator = new Random();
_imageUrls = new List <ImageResource>
{
new ImageResource {
ImageFrom = ImageOrigin.Uri, ImageSourceText = "http://yeahsoup.s3-us-west-2.amazonaws.com/wp-content/uploads/2015/05/img1114.jpg"
},
new ImageResource {
ImageFrom = ImageOrigin.Stream, ImageSourceText = "http://i.telegraph.co.uk/multimedia/archive/02262/A124CE_2262003b.jpg"
},
new ImageResource {
ImageFrom = ImageOrigin.Uri, ImageSourceText = "http://i.telegraph.co.uk/multimedia/archive/01476/chimp_1476818c.jpg"
},
new ImageResource {
ImageFrom = ImageOrigin.Stream, ImageSourceText = "http://i.huffpost.com/gen/1490756/images/o-CHIMPANZEE-facebook.jpg"
},
new ImageResource {
ImageFrom = ImageOrigin.Uri, ImageSourceText = "http://static1.squarespace.com/static/523b539be4b0a75330f9c8ce/55a55614e4b01d30adbfe144/55a557ace4b0632463d49108/1436909257139/babyowl.jpg?format=1000w"
},
new ImageResource {
ImageFrom = ImageOrigin.Uri, ImageSourceText = "http://www.rantlifestyle.com/wp-content/uploads/2014/06/schattigebabydier11.jpg"
},
new ImageResource {
ImageFrom = ImageOrigin.Stream, ImageSourceText = "http://ww2.valdosta.edu/~kaletour/bb1.jpg"
},
new ImageResource {
ImageFrom = ImageOrigin.Uri, ImageSourceText = "https://36.media.tumblr.com/5c493da746cc1c1f438ae304591244c4/tumblr_n9a78n99Ea1tvs3v3o1_500.jpg"
},
new ImageResource {
ImageFrom = ImageOrigin.Uri, ImageSourceText = "http://streetloop.com/wp-content/uploads/2014/07/Baby-animals-looking-like-their-parents25.jpg"
}
};
ToggleZoomCommand = new Command((_) =>
{
EnableZoom = !EnableZoom;
});
ChangeImageCommand = new Command(async(_) =>
{
var index = _indexGenerator.Next(0, _imageUrls.Count - 1);
var resource = _imageUrls[index];
ImageComesFrom = Enum.GetName(typeof(ImageOrigin), resource.ImageFrom);
if (resource.ImageFrom == ImageOrigin.Uri)
{
Image = new UriImageSource()
{
Uri = new Uri(resource.ImageSourceText)
}
}
;
else if (resource.ImageFrom == ImageOrigin.Stream)
{
// this would normally be something off the device, but any stream will do so we'll just manually get a stream to the online image
var client = new HttpClient(new NativeMessageHandler());
var stream = await client.GetStreamAsync(resource.ImageSourceText);
Image = ImageSource.FromStream(() => stream);
}
else
{
throw new NotSupportedException($"Unable to load image of type {ImageComesFrom} with value {resource.ImageSourceText}.");
}
});
// enable zoom should initially be false
EnableZoom = false;
// initialize the image
ChangeImageCommand.Execute(null);
}