Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / Model / ModelPropertyDescriptor.cs / 1305376 / ModelPropertyDescriptor.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace System.Activities.Presentation.Model { using System; using System.ComponentModel; // This is a property descriptor that wraps ModelProperty objects. // It is used when someone uses TypeDescriptor to ask for type information // on an editing model item. internal class ModelPropertyDescriptor : PropertyDescriptor { ModelProperty itemProperty; TypeConverter converter; internal ModelPropertyDescriptor(ModelProperty itemProperty) : base(itemProperty.Name, null) { this.itemProperty = itemProperty; } public override AttributeCollection Attributes { get { return this.itemProperty.Attributes; } } // Returns the type converter for this property. Our property // descriptor wrapper is "complete" in that it always returns // editing model item objects. Because of that, we must wrap // all type converters. public override TypeConverter Converter { get { if (this.converter == null) { TypeConverter baseConverter = base.Converter; IModelTreeItem propertyParent = this.itemProperty.Parent as IModelTreeItem; this.converter = new ModelTypeConverter(propertyParent.ModelTreeManager, baseConverter); } return converter; } } public override bool IsBrowsable { get { return this.itemProperty.IsBrowsable; } } // Returns the type of object that defined this property. public override Type ComponentType { get { return this.itemProperty.Parent.ItemType; } } public override bool IsReadOnly { get { return this.itemProperty.IsReadOnly; } } // Returns the data type of the property. public override Type PropertyType { get { return this.itemProperty.PropertyType; } } public override PropertyDescriptorCollection GetChildProperties(object instance, Attribute[] filter) { return base.GetChildProperties(instance, filter); } public override bool CanResetValue(object component) { return this.itemProperty.IsSet; } public override object GetEditor(Type editorBaseType) { // The new PropertyEntry PropertyValue editor model does not use this return null; } // Returns the current value of this property. // When the object is not primitive, enum, or string we always return the ModelItem wrapping it. // this enables nested binding in wpf still go through modelItems tree so taht we can intercept // the property sets e.g "{Binding Path=RootModel.ComplexProperty.Blah"}, since we return a ModelItem // for ComplexProperty we can still intercept sets made from Wpf controls to Blah even if ComplexProperty // type does not implement INotifyPropertyChanged. public override object GetValue(object component) { ModelItem value = this.itemProperty.Value; if (value == null) { return null; } Type itemType = value.ItemType; if (itemType.IsPrimitive || itemType.IsEnum || itemType.Equals(typeof(String))) { return value.GetCurrentValue(); } return value; } public override void ResetValue(object component) { this.itemProperty.ClearValue(); } // Sets the property value to the given value. For // convenience, the value passed can either be an // item or a raw value. In the latter case we will // wrap the value into an item for you. public override void SetValue(object component, object value) { this.itemProperty.SetValue(value); } // Returns true if the value should be serialized to code. public override bool ShouldSerializeValue(object component) { // If the local value is set, see if the property supports // a ShouldSerialize on its property descriptor. If it doesn't, // then we let the IsSet dictate the 'setness'. if (this.itemProperty.IsSet) { ModelPropertyImpl modelProp = this.itemProperty as ModelPropertyImpl; if (modelProp != null) { return modelProp.PropertyDescriptor.ShouldSerializeValue(this.itemProperty.Parent.GetCurrentValue()); } return true; } return false; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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