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using System;
using System.Globalization;
using System.Windows;
using System.Windows.Controls;
namespace Xamarin.Forms.Platform.WinPhone
{
public class ViewToRendererConverter : System.Windows.Data.IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var view = value as View;
if (view == null)
return null;
return new WrapperControl(view);
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotSupportedException();
}
class WrapperControl : ContentControl
{
readonly View _view;
public WrapperControl(View view)
{
_view = view;
_view.MeasureInvalidated += (sender, args) => InvalidateMeasure();
IVisualElementRenderer visualElementRenderer = Platform.CreateRenderer(view);
Platform.SetRenderer(view, visualElementRenderer);
Content = visualElementRenderer.ContainerElement;
// make sure we re-measure once the template is applied
var frameworkElement = visualElementRenderer.ContainerElement as FrameworkElement;
if (frameworkElement != null)
{
frameworkElement.Loaded += (sender, args) =>
{
_view.InvalidateMeasure(InvalidationTrigger.MeasureChanged);
InvalidateMeasure();
};
}
}
protected override System.Windows.Size ArrangeOverride(System.Windows.Size finalSize)
{
_view.IsInNativeLayout = true;
Layout.LayoutChildIntoBoundingRegion(_view, new Rectangle(0, 0, finalSize.Width, finalSize.Height));
_view.IsInNativeLayout = false;
var content = Content as FrameworkElement;
content?.Arrange(new Rect(0, 0, finalSize.Width, finalSize.Height));
return finalSize;
}
protected override System.Windows.Size MeasureOverride(System.Windows.Size availableSize)
{
var content = Content as FrameworkElement;
content?.Measure(availableSize);
Size request = _view.Measure(availableSize.Width, availableSize.Height, MeasureFlags.IncludeMargins).Request;
System.Windows.Size result;
if (_view.HorizontalOptions.Alignment == LayoutAlignment.Fill && !double.IsInfinity(availableSize.Width) && availableSize.Width != 0)
result = new System.Windows.Size(availableSize.Width, request.Height);
else
result = new System.Windows.Size(request.Width, request.Height);
_view.Layout(new Rectangle(0, 0, result.Width, result.Width));
return result;
}
}
}
}
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