124 строки
3.2 KiB
C#
124 строки
3.2 KiB
C#
using System;
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using Windows.UI.Xaml;
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using Windows.UI.Xaml.Controls;
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using WRect = Windows.Foundation.Rect;
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namespace Xamarin.Forms.Platform.UWP
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{
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public class ViewToRendererConverter : Windows.UI.Xaml.Data.IValueConverter
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{
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public object Convert(object value, Type targetType, object parameter, string language)
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{
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var view = value as View;
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if (view == null)
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{
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var page = value as Page;
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if (page != null)
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{
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IVisualElementRenderer renderer = page.GetOrCreateRenderer();
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return renderer.ContainerElement;
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}
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}
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if (view == null)
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return null;
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return new WrapperControl(view);
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}
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public object ConvertBack(object value, Type targetType, object parameter, string language)
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{
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throw new NotSupportedException();
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}
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internal class WrapperControl : Panel
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{
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readonly View _view;
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FrameworkElement FrameworkElement { get; }
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internal void CleanUp()
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{
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_view?.Cleanup();
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if(_view != null)
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_view.MeasureInvalidated -= OnMeasureInvalidated;
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}
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public WrapperControl(View view)
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{
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_view = view;
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_view.MeasureInvalidated += OnMeasureInvalidated;
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IVisualElementRenderer renderer = Platform.CreateRenderer(view);
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Platform.SetRenderer(view, renderer);
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FrameworkElement = renderer.ContainerElement;
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Children.Add(renderer.ContainerElement);
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// make sure we re-measure once the template is applied
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if (FrameworkElement != null)
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{
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FrameworkElement.Loaded += (sender, args) =>
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{
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// If the view is a layout (stacklayout, grid, etc) we need to trigger a layout pass
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// with all the controls in a consistent native state (i.e., loaded) so they'll actually
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// have Bounds set
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(_view as Layout)?.ForceLayout();
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InvalidateMeasure();
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};
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}
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}
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void OnMeasureInvalidated(object sender, EventArgs e)
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{
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InvalidateMeasure();
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}
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protected override Windows.Foundation.Size ArrangeOverride(Windows.Foundation.Size finalSize)
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{
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_view.IsInNativeLayout = true;
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Layout.LayoutChildIntoBoundingRegion(_view, new Rectangle(0, 0, finalSize.Width, finalSize.Height));
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if (_view.Width <= 0 || _view.Height <= 0)
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{
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// Hide Panel when size _view is empty.
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// It is necessary that this element does not overlap other elements when it should be hidden.
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Opacity = 0;
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}
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else
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{
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Opacity = 1;
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FrameworkElement?.Arrange(new WRect(_view.X, _view.Y, _view.Width, _view.Height));
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}
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_view.IsInNativeLayout = false;
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return finalSize;
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}
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protected override Windows.Foundation.Size MeasureOverride(Windows.Foundation.Size availableSize)
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{
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Size request = _view.Measure(availableSize.Width, availableSize.Height, MeasureFlags.IncludeMargins).Request;
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if (request.Height < 0)
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{
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request.Height = availableSize.Height;
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}
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Windows.Foundation.Size result;
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if (_view.HorizontalOptions.Alignment == LayoutAlignment.Fill && !double.IsInfinity(availableSize.Width) && availableSize.Width != 0)
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{
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result = new Windows.Foundation.Size(availableSize.Width, request.Height);
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}
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else
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{
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result = new Windows.Foundation.Size(request.Width, request.Height);
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}
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FrameworkElement?.Measure(availableSize);
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return result;
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}
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}
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}
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} |