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using System;
using System.ComponentModel;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Data;
#if WINDOWS_UWP
namespace Xamarin.Forms.Platform.UWP
#else
namespace Xamarin.Forms.Platform.WinRT
#endif
{
class NativePropertyListener : DependencyObject, INotifyPropertyChanged
{
readonly DependencyObject _target;
readonly string _targetProperty;
public static readonly DependencyProperty TargetPropertyValueProperty = DependencyProperty.Register(nameof(TargetPropertyValue), typeof(object), typeof(NativePropertyListener), new PropertyMetadata(null, OnNativePropertyChanged));
public event PropertyChangedEventHandler PropertyChanged;
public NativePropertyListener(DependencyObject target, string propertyName)
{
_target = target;
_targetProperty = propertyName;
BindingOperations.SetBinding(this, TargetPropertyValueProperty, new Windows.UI.Xaml.Data.Binding() { Source = _target, Path = new PropertyPath(_targetProperty), Mode = Windows.UI.Xaml.Data.BindingMode.OneWay });
}
public void Dispose()
{
ClearValue(TargetPropertyValueProperty);
}
public object TargetPropertyValue
{
get
{
return GetValue(TargetPropertyValueProperty);
}
}
static void OnNativePropertyChanged(object sender, DependencyPropertyChangedEventArgs args)
{
NativePropertyListener source = (NativePropertyListener)sender;
source?.PropertyChanged?.Invoke(source._target, new PropertyChangedEventArgs(source._targetProperty));
}
}
}
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