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Diffstat (limited to 'Xamarin.Forms.Core/Interactivity/Trigger.cs')
-rw-r--r-- | Xamarin.Forms.Core/Interactivity/Trigger.cs | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/Xamarin.Forms.Core/Interactivity/Trigger.cs b/Xamarin.Forms.Core/Interactivity/Trigger.cs new file mode 100644 index 00000000..ea3dc5ae --- /dev/null +++ b/Xamarin.Forms.Core/Interactivity/Trigger.cs @@ -0,0 +1,60 @@ +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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