98 строки
2.9 KiB
C#
98 строки
2.9 KiB
C#
using System;
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using Windows.UI.Xaml.Controls;
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using Windows.UI.Xaml.Data;
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using WItemsControl = Windows.UI.Xaml.Controls.ItemsControl;
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using WSelectionChangedEventArgs = Windows.UI.Xaml.Controls.SelectionChangedEventArgs;
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namespace Xamarin.Forms.Platform.UWP
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{
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public class TableViewRenderer : ViewRenderer<TableView, Windows.UI.Xaml.Controls.ListView>
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{
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bool _ignoreSelectionEvent;
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bool _disposed;
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public override SizeRequest GetDesiredSize(double widthConstraint, double heightConstraint)
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{
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SizeRequest result = base.GetDesiredSize(widthConstraint, heightConstraint);
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result.Minimum = new Size(40, 40);
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return result;
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}
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protected override void OnElementChanged(ElementChangedEventArgs<TableView> e)
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{
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if (e.OldElement != null)
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{
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e.OldElement.ModelChanged -= OnModelChanged;
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}
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if (e.NewElement != null)
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{
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if (Control == null)
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{
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SetNativeControl(new Windows.UI.Xaml.Controls.ListView
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{
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ItemContainerStyle = (Windows.UI.Xaml.Style)Windows.UI.Xaml.Application.Current.Resources["FormsListViewItem"],
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ItemTemplate = (Windows.UI.Xaml.DataTemplate)Windows.UI.Xaml.Application.Current.Resources["CellTemplate"],
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GroupStyle = { new GroupStyle { HidesIfEmpty = false, HeaderTemplate = (Windows.UI.Xaml.DataTemplate)Windows.UI.Xaml.Application.Current.Resources["TableSection"] } },
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HeaderTemplate = (Windows.UI.Xaml.DataTemplate)Windows.UI.Xaml.Application.Current.Resources["TableRoot"],
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SelectionMode = Windows.UI.Xaml.Controls.ListViewSelectionMode.Single
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});
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// You can't set ItemsSource directly to a CollectionViewSource, it crashes.
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Control.SetBinding(WItemsControl.ItemsSourceProperty, "");
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Control.SelectionChanged += OnSelectionChanged;
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}
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e.NewElement.ModelChanged += OnModelChanged;
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OnModelChanged(e.NewElement, EventArgs.Empty);
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}
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base.OnElementChanged(e);
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}
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protected override void Dispose(bool disposing)
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{
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if(disposing && !_disposed)
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{
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_disposed = true;
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if(Control != null)
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{
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Control.SelectionChanged -= OnSelectionChanged;
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}
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}
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base.Dispose(disposing);
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}
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void OnModelChanged(object sender, EventArgs e)
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{
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Control.Header = Element.Root;
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// This auto-selects the first item in the new DataContext, so we just null it and ignore the selection
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// as this selection isn't driven by user input
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_ignoreSelectionEvent = true;
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Control.DataContext = new CollectionViewSource { Source = Element.Root, IsSourceGrouped = true };
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_ignoreSelectionEvent = false;
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}
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void OnSelectionChanged(object sender, WSelectionChangedEventArgs e)
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{
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if (!_ignoreSelectionEvent)
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{
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foreach (object item in e.AddedItems)
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{
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if (item is Cell cell)
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{
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if (cell.IsEnabled)
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Element.Model.RowSelected(cell);
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break;
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}
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}
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}
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if (Control == null)
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return;
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Control.SelectedItem = null;
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}
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}
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} |