private async void ImageCropperPreview_ManipulationCompleted(object sender, Windows.UI.Xaml.Input.ManipulationCompletedRoutedEventArgs e)
{
await SetSelectedRegionInViewModel();
await RunOnUIThreadAsync(CoreDispatcherPriority.Normal, () =>
{
ImageCropperPreview.Focus(FocusState.Programmatic);
});
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// METHODS //////////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
private async void ViewModel_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
switch (e.PropertyName)
{
case nameof(ViewModel.PreviewFile):
await RunOnUIThreadAsync(CoreDispatcherPriority.Normal, async() =>
{
await ImageCropperPreview.LoadImageFromFile(ViewModel.PreviewFile);
ImageCropperPreview_ManipulationCompleted(ImageCropperPreview, null);
});
break;
case nameof(ViewModel.SelectedAspectRatioValue):
await RunOnUIThreadAsync(CoreDispatcherPriority.High, () =>
{
ImageCropperPreview.AspectRatio = ViewModel.SelectedAspectRatioValue;
});
await Task.Delay(500); // ugh... 😞
await SetSelectedRegionInViewModel();
break;
case nameof(ViewModel.MinLength):
await RunOnUIThreadAsync(CoreDispatcherPriority.Normal, () =>
{
ImageCropperPreview.MinCroppedPixelLength = ViewModel.MinLength.Pixels;
});
break;
case nameof(ViewModel.SelectedX):
await RunOnUIThreadAsync(CoreDispatcherPriority.Normal, () =>
{
Rect newRect = ImageCropperPreview.CroppedRegion;
newRect.X = ViewModel.SelectedX.Pixels;
ImageCropperPreview.TrySetCroppedRegion(newRect);
});
break;
case nameof(ViewModel.SelectedY):
await RunOnUIThreadAsync(CoreDispatcherPriority.Normal, () =>
{
Rect newRect = ImageCropperPreview.CroppedRegion;
newRect.Y = ViewModel.SelectedY.Pixels;
ImageCropperPreview.TrySetCroppedRegion(newRect);
});
break;
case nameof(ViewModel.SelectedWidth):
await RunOnUIThreadAsync(CoreDispatcherPriority.Normal, () =>
{
Rect newRect = ImageCropperPreview.CroppedRegion;
newRect.Width = ViewModel.SelectedWidth.Pixels;
newRect.Height = ViewModel.SelectedHeight.Pixels;
newRect.X = ViewModel.SelectedX.Pixels;
newRect.Y = ViewModel.SelectedY.Pixels;
if (ViewModel.IsFixedAspectRatioSelected)
{
// aspect ratio needs to be *exactly* right, so it sometimes has to be recalculated
ImageCropperPreview.AspectRatio = newRect.Width / newRect.Height;
}
ImageCropperPreview.TrySetCroppedRegion(newRect);
});
break;
case nameof(ViewModel.SelectedHeight):
await RunOnUIThreadAsync(CoreDispatcherPriority.Normal, () =>
{
Rect newRect = ImageCropperPreview.CroppedRegion;
newRect.Width = ViewModel.SelectedWidth.Pixels;
newRect.Height = ViewModel.SelectedHeight.Pixels;
newRect.X = ViewModel.SelectedX.Pixels;
newRect.Y = ViewModel.SelectedY.Pixels;
if (ViewModel.IsFixedAspectRatioSelected)
{
// aspect ratio needs to be *exactly* right, so it sometimes has to be recalculated
ImageCropperPreview.AspectRatio = newRect.Width / newRect.Height;
}
ImageCropperPreview.TrySetCroppedRegion(newRect);
});
break;
}
}
