diff options
Diffstat (limited to 'Xamarin.Forms.Platform.MacOS/Cells/ImageCellRenderer.cs')
-rw-r--r-- | Xamarin.Forms.Platform.MacOS/Cells/ImageCellRenderer.cs | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/Xamarin.Forms.Platform.MacOS/Cells/ImageCellRenderer.cs b/Xamarin.Forms.Platform.MacOS/Cells/ImageCellRenderer.cs new file mode 100644 index 00000000..8bd76772 --- /dev/null +++ b/Xamarin.Forms.Platform.MacOS/Cells/ImageCellRenderer.cs @@ -0,0 +1,68 @@ +using System.ComponentModel; +using System.Threading.Tasks; +using AppKit; +using Foundation; + +namespace Xamarin.Forms.Platform.MacOS +{ + public class ImageCellRenderer : TextCellRenderer + { + public override NSView GetCell(Cell item, NSView reusableView, NSTableView tv) + { + var tvc = reusableView as CellNSView ?? new CellNSView(NSTableViewCellStyle.ImageSubtitle); + + var result = (CellNSView)base.GetCell(item, tvc, tv); + + var imageCell = (ImageCell)item; + + WireUpForceUpdateSizeRequested(item, result, tv); + +#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed + SetImage(imageCell, result); +#pragma warning restore CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed + + return result; + } + + protected override async void HandlePropertyChanged(object sender, PropertyChangedEventArgs args) + { + var tvc = (CellNSView)sender; + var imageCell = (ImageCell)tvc.Cell; + + base.HandlePropertyChanged(sender, args); + + if (args.PropertyName == ImageCell.ImageSourceProperty.PropertyName) + await SetImage(imageCell, tvc); + } + + static async Task SetImage(ImageCell cell, CellNSView target) + { + var source = cell.ImageSource; + + target.ImageView.Image = null; + + IImageSourceHandler handler; + + if (source != null && (handler = Registrar.Registered.GetHandler<IImageSourceHandler>(source.GetType())) != null) + { + NSImage uiimage; + try + { + uiimage = await handler.LoadImageAsync(source).ConfigureAwait(false); + } + catch (TaskCanceledException) + { + uiimage = null; + } + + NSRunLoop.Main.BeginInvokeOnMainThread(() => + { + target.ImageView.Image = uiimage; + target.NeedsLayout = true; + }); + } + else + target.ImageView.Image = null; + } + } +}
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