private async void ImageTool_Unloaded(object sender, RoutedEventArgs e)
{
if (TempImageFile != null)
{
await TempImageFile.DeleteAsync();
TempImageFile = null;
}
}
private async void OnTempImageFileChanged()
{
if (_isTemplateLoaded && SourceImageFile != null && TempImageFile != null)
{
scrollViewer.ZoomToFactor(1);
// Ensure the stream is disposed once the image is loaded
using (IRandomAccessStream fileStream = await TempImageFile.OpenAsync(Windows.Storage.FileAccessMode.Read))
{
BitmapDecoder decoder = await BitmapDecoder.CreateAsync(fileStream);
this.sourceImagePixelHeight = decoder.PixelHeight;
this.sourceImagePixelWidth = decoder.PixelWidth;
}
if (this.sourceImagePixelHeight < 2 * CropSelection.MinSelectRegionSize ||
this.sourceImagePixelWidth < 2 * CropSelection.MinSelectRegionSize)
{
MessageDialog dialog = new MessageDialog("Image size is (" + sourceImagePixelWidth + "," + sourceImagePixelHeight + ") now and should be more than " + 2 * CropSelection.MinSelectRegionSize + " px");
await dialog.ShowAsync();
}
else
{
double sourceImageScale = 1;
if (this.sourceImagePixelHeight < this.ActualHeight &&
this.sourceImagePixelWidth < this.ActualWidth)
{
this.sourceImage.Stretch = Windows.UI.Xaml.Media.Stretch.None;
}
else
{
sourceImageScale = Math.Min(this.ActualWidth / this.sourceImagePixelWidth,
this.ActualHeight / this.sourceImagePixelHeight);
this.sourceImage.Stretch = Windows.UI.Xaml.Media.Stretch.Uniform;
}
ImageSource preSource = this.sourceImage.Source;
this.sourceImage.Source = await BitmapHelper.GetCroppedBitmapAsync(
this.TempImageFile,
new Point(0, 0),
new Size(this.sourceImagePixelWidth, this.sourceImagePixelHeight),
sourceImageScale);
if (preSource != null)
{
WriteableBitmap pre = preSource as WriteableBitmap;
var source = this.sourceImage.Source as WriteableBitmap;
if (pre.PixelWidth == source.PixelWidth && pre.PixelHeight == source.PixelHeight)
{
this.editImage.Source = this.sourceImage.Source;
}
}
}
}
}