src/Tizen.NUI/src/internal/XamlBinding/Setter.cs

   1 using System;
   2 using System.Collections.Generic;
   3 using System.Reflection;
   4 using System.Runtime.CompilerServices;
   5 using System.Xml;
   6 using Tizen.NUI.Binding.Internals;
   7 using Tizen.NUI.Xaml;
   8
   9 namespace Tizen.NUI.Binding
  10 {
  11     [ContentProperty("Value")]
  12     [ProvideCompiled("Tizen.NUI.Core.XamlC.SetterValueProvider")]
  13     internal sealed class Setter : IValueProvider
  14     {
  15         readonly ConditionalWeakTable<BindableObject, object> _originalValues = new ConditionalWeakTable<BindableObject, object>();
  16
  17         public BindableProperty Property { get; set; }
  18
  19         public object Value { get; set; }
  20
  21         object IValueProvider.ProvideValue(IServiceProvider serviceProvider)
  22         {
  23             if (Property == null)
  24             {
  25                 var lineInfoProvider = serviceProvider.GetService(typeof(IXmlLineInfoProvider)) as IXmlLineInfoProvider;
  26                 IXmlLineInfo lineInfo = lineInfoProvider != null ? lineInfoProvider.XmlLineInfo : new XmlLineInfo();
  27                 throw new XamlParseException("Property not set", lineInfo);
  28             }
  29             var valueconverter = serviceProvider.GetService(typeof(IValueConverterProvider)) as IValueConverterProvider;
  30
  31             Func<MemberInfo> minforetriever =
  32                 () =>
  33                 (MemberInfo)Property.DeclaringType.GetRuntimeProperty(Property.PropertyName) ?? (MemberInfo)Property.DeclaringType.GetRuntimeMethod("Get" + Property.PropertyName, new[] { typeof(BindableObject) });
  34
  35             object value = valueconverter?.Convert(Value, Property.ReturnType, minforetriever, serviceProvider);
  36             Value = value;
  37             return this;
  38         }
  39
  40         internal void Apply(BindableObject target, bool fromStyle = false)
  41         {
  42             if (target == null)
  43                 throw new ArgumentNullException("target");
  44             if (Property == null)
  45                 return;
  46
  47             object originalValue = target.GetValue(Property);
  48             if (!Equals(originalValue, Property.DefaultValue))
  49             {
  50                 _originalValues.Remove(target);
  51                 _originalValues.Add(target, originalValue);
  52             }
  53
  54             var dynamicResource = Value as DynamicResource;
  55             var binding = Value as BindingBase;
  56             if (binding != null)
  57                 target.SetBinding(Property, binding.Clone(), fromStyle);
  58             else if (dynamicResource != null)
  59                 target.SetDynamicResource(Property, dynamicResource.Key, fromStyle);
  60             else
  61             {
  62                 if (Value is IList<VisualStateGroup> visualStateGroupCollection)
  63                     target.SetValue(Property, visualStateGroupCollection.Clone(), fromStyle);
  64                 else
  65                     target.SetValue(Property, Value, fromStyle);
  66             }
  67         }
  68
  69         internal void UnApply(BindableObject target, bool fromStyle = false)
  70         {
  71             if (target == null)
  72                 throw new ArgumentNullException(nameof(target));
  73             if (Property == null)
  74                 return;
  75
  76             object actual = target.GetValue(Property);
  77             if (!Equals(actual, Value) && !(Value is Tizen.NUI.Binding.Binding) && !(Value is DynamicResource))
  78             {
  79                 //Do not reset default value if the value has been changed
  80                 _originalValues.Remove(target);
  81                 return;
  82             }
  83
  84             object defaultValue;
  85             if (_originalValues.TryGetValue(target, out defaultValue))
  86             {
  87                 //reset default value, unapply bindings and dynamicResource
  88                 target.SetValue(Property, defaultValue, fromStyle);
  89                 _originalValues.Remove(target);
  90             }
  91             else
  92                 target.ClearValue(Property);
  93         }
  94     }
  95 }