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using System;
using System.Collections.Generic;
using System.Reflection;
using Xamarin.Forms.Xaml;
namespace Xamarin.Forms
{
[ContentProperty("Setters")]
public sealed class Trigger : TriggerBase, IValueProvider
{
public Trigger([TypeConverter(typeof(TypeTypeConverter))] [Parameter("TargetType")] Type targetType) : base(new PropertyCondition(), targetType)
{
}
public BindableProperty Property
{
get { return ((PropertyCondition)Condition).Property; }
set
{
if (((PropertyCondition)Condition).Property == value)
return;
if (IsSealed)
throw new InvalidOperationException("Can not change Property once the Trigger has been applied.");
OnPropertyChanging();
((PropertyCondition)Condition).Property = value;
OnPropertyChanged();
}
}
public new IList<Setter> Setters
{
get { return base.Setters; }
}
public object Value
{
get { return ((PropertyCondition)Condition).Value; }
set
{
if (((PropertyCondition)Condition).Value == value)
return;
if (IsSealed)
throw new InvalidOperationException("Can not change Value once the Trigger has been applied.");
OnPropertyChanging();
((PropertyCondition)Condition).Value = value;
OnPropertyChanged();
}
}
object IValueProvider.ProvideValue(IServiceProvider serviceProvider)
{
var valueconverter = serviceProvider.GetService(typeof(IValueConverterProvider)) as IValueConverterProvider;
Func<MemberInfo> minforetriever = () => Property.DeclaringType.GetRuntimeProperty(Property.PropertyName);
object value = valueconverter.Convert(Value, Property.ReturnType, minforetriever, serviceProvider);
Value = value;
return this;
}
}
}
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