67 lines
2.1 KiB
C#
67 lines
2.1 KiB
C#
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using Ooui.Forms.Renderers;
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using System.ComponentModel;
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using System.Threading.Tasks;
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using Xamarin.Forms;
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using Xamarin.Forms.Internals;
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namespace Ooui.Forms.Cells
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{
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public class ImageCellRenderer : TextCellRenderer
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{
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public override CellView GetCell(Cell item, CellView reusableView, List listView)
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{
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var nativeImageCell = reusableView as CellView ?? new CellView();
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var result = (CellView)base.GetCell(item, nativeImageCell, listView);
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var imageCell = (ImageCell)item;
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WireUpForceUpdateSizeRequested(item, result);
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#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
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SetImage(imageCell, result);
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#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
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return result;
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}
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protected override async void HandlePropertyChanged(object sender, PropertyChangedEventArgs args)
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{
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var tvc = (CellView)sender;
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var imageCell = (ImageCell)tvc.Cell;
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base.HandlePropertyChanged(sender, args);
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if (args.PropertyName == ImageCell.ImageSourceProperty.PropertyName)
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await SetImage(imageCell, tvc);
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}
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static async Task SetImage(ImageCell cell, CellView target)
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{
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var source = cell.ImageSource;
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target.ImageView.Source = null;
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IImageSourceHandler handler;
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if (source != null && (handler =
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Registrar.Registered.GetHandler<Renderers.IImageSourceHandler>(source.GetType())) != null)
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{
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string image;
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try
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{
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image = await handler.LoadImageAsync(source).ConfigureAwait(false);
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}
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catch (TaskCanceledException)
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{
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image = null;
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}
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target.ImageView.Source = image;
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}
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else
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target.ImageView.Source = null;
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}
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}
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}
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