public static Size GetImageSourceSize(this WImageSource source)
{
if (source is null)
{
return(Size.Zero);
}
else if (source is BitmapSource bitmap)
{
return(new Size
{
Width = bitmap.PixelWidth,
Height = bitmap.PixelHeight
});
}
else if (source is CanvasImageSource canvas)
{
return(new Size
{
Width = canvas.Size.Width,
Height = canvas.Size.Height
});
}
throw new InvalidCastException($"\"{source.GetType().FullName}\" is not supported.");
}
public Task <Windows.UI.Xaml.Media.ImageSource> LoadImageAsync(ImageSource imagesoure, CancellationToken cancelationToken)
{
//BitmapImage bitmapImage = null;
//UriImageSource uriImageSource = imagesoure as UriImageSource;
//if (uriImageSource != null && uriImageSource.Uri != null)
//{
// using (Stream stream = await uriImageSource.GetStreamAsync(cancelationToken))
// {
// if (stream != null && stream.CanRead)
// {
// IRandomAccessStream inMemoryStream = new InMemoryRandomAccessStream();
// using (var inputStream = stream.AsInputStream())
// {
// await RandomAccessStream.CopyAsync(inputStream, inMemoryStream);
// }
// inMemoryStream.Seek(0);
// bitmapImage = new BitmapImage();
// bitmapImage.SetSource(inMemoryStream);
// }
// }
//}
//return bitmapImage;
Windows.UI.Xaml.Media.ImageSource bitmapImage = null;
UriImageSource fileImageSource = imagesoure as UriImageSource;
if (fileImageSource != null)
{
bitmapImage = new BitmapImage(fileImageSource.Uri);
}
return(Task.FromResult(bitmapImage));
}
public TodoItem(string title, string description, DateTime date, ImageSource imagesource)
{
this.id = Guid.NewGuid().ToString(); //生成id
this.title = title;
this.description = description;
this.date = date;
this.imagesource = imagesource;
}
public TodoItem(string title, string description, ImageSource image, DateTime date)
{
this.id = Guid.NewGuid().ToString();
this.title = title;
this.description = description;
this.completed = false;
this.date = date;
this.image = image;
}
public Task <Windows.UI.Xaml.Media.ImageSource> LoadImageAsync(ImageSource imagesoure, CancellationToken cancelationToken)
{
Windows.UI.Xaml.Media.ImageSource bitmapImage = null;
FileImageSource fileImageSource = imagesoure as FileImageSource;
if (fileImageSource != null)
{
string file = fileImageSource.File;
bitmapImage = new BitmapImage(new Uri(string.Concat("/", file), UriKind.Relative));
}
return(Task.FromResult(bitmapImage));
}
async Task UpdateSource()
{
Element.SetIsLoading(true);
ImageSource source = Element.Source;
IImageSourceHandler handler;
if (source != null && (handler = Registrar.Registered.GetHandler <IImageSourceHandler>(source.GetType())) != null)
{
Windows.UI.Xaml.Media.ImageSource imagesource = null;
try
{
imagesource = await handler.LoadImageAsync(source);
}
catch (OperationCanceledException)
{
imagesource = null;
}
catch (Exception ex)
{
Log.Warning("Image Loading", $"Error updating image source: {ex}");
}
// In the time it takes to await the imagesource, some zippy little app
// might have disposed of this Image already.
if (Control != null)
{
Control.Source = imagesource;
}
RefreshImage();
}
else
{
Control.Source = null;
Element?.SetIsLoading(false);
}
}
void IImageVisualElementRenderer.SetImage(Windows.UI.Xaml.Media.ImageSource image)
{
Control.Source = image;
}
