Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / Model / ModelPropertyImpl.cs / 1305376 / ModelPropertyImpl.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace System.Activities.Presentation.Model { using System.Collections.Generic; using System.ComponentModel; using System.Windows.Documents; // This class provides the implementation for a model property. // this intercepts sets /gets to the property and works with modeltreemanager // to keep the xaml in [....]. class ModelPropertyImpl : ModelProperty { object defaultValue; ModelItem parent; PropertyDescriptor propertyDescriptor; AttributeCollection attributes; bool isAttached = false; public ModelPropertyImpl(ModelItem parent, PropertyDescriptor propertyDescriptor, bool isAttached) { this.parent = parent; this.propertyDescriptor = propertyDescriptor; // using this a marker to indicate this hasnt been computed yet. this.defaultValue = this; this.isAttached = isAttached; } public override Type AttachedOwnerType { get { return this.parent.GetType(); } } public override AttributeCollection Attributes { get { if (this.attributes == null) { if (propertyDescriptor.ComponentType.IsGenericType) { ListattributeList = new List (this.propertyDescriptor.Attributes.Count); foreach (Attribute attr in this.propertyDescriptor.Attributes) { attributeList.Add(attr); } // Merge propertyDescriptor.Attributes with generic type definition Attributes Type genericInstanceType = propertyDescriptor.ComponentType.GetGenericTypeDefinition(); PropertyDescriptor pd = TypeDescriptor.GetProvider(genericInstanceType).GetTypeDescriptor(genericInstanceType).GetProperties()[this.Name]; if (null != pd) { foreach (Attribute attr in pd.Attributes) { if (!attributeList.Contains(attr)) { attributeList.Add(attr); } } } this.attributes = new AttributeCollection(attributeList.ToArray()); } else { this.attributes = propertyDescriptor.Attributes; } } return this.attributes; } } public override ModelItemCollection Collection { get { return this.Value as ModelItemCollection; } } public override object ComputedValue { get { object computedValue = null; if (this.Value != null) { computedValue = Value.GetCurrentValue(); } return computedValue; } set { SetValue(value); } } public override System.ComponentModel.TypeConverter Converter { get { return new ModelTypeConverter(((IModelTreeItem)this.Parent).ModelTreeManager, propertyDescriptor.Converter); } } public override object DefaultValue { get { if (Object.ReferenceEquals(this.defaultValue, this)) { DefaultValueAttribute defaultValueAttribute = this.propertyDescriptor.Attributes[typeof(DefaultValueAttribute)] as DefaultValueAttribute; this.defaultValue = (defaultValueAttribute == null) ? null : defaultValueAttribute.Value; } return this.defaultValue; } } public override ModelItemDictionary Dictionary { get { return Value as ModelItemDictionary; } } public override bool IsAttached { get { return this.isAttached; } } public override bool IsBrowsable { get { return propertyDescriptor.IsBrowsable; } } public override bool IsCollection { get { return this.Value is ModelItemCollection; } } public override bool IsDictionary { get { return this.Value is ModelItemDictionary; } } public override bool IsReadOnly { get { return propertyDescriptor.IsReadOnly; } } public override bool IsSet { get { return this.Value != null; } } public override string Name { get { return propertyDescriptor.Name; } } public override ModelItem Parent { get { return parent; } } public override Type PropertyType { get { return propertyDescriptor.PropertyType; } } public override ModelItem Value { get { return ((IModelTreeItem)parent).ModelTreeManager.GetValue(this); } } internal PropertyDescriptor PropertyDescriptor { get { return propertyDescriptor; } } public override void ClearValue() { if (!this.IsReadOnly) { ((IModelTreeItem)parent).ModelTreeManager.ClearValue(this); } } public override ModelItem SetValue(object value) { return ((IModelTreeItem)parent).ModelTreeManager.SetValue(this, value); } internal object SetValueCore(ModelItem newValueModelItem) { object newValueInstance = (newValueModelItem == null) ? null : newValueModelItem.GetCurrentValue(); ModelItem oldValueModelItem = this.Value; IModelTreeItem parent = (IModelTreeItem)this.Parent; // try update the instance this.PropertyDescriptor.SetValue(this.Parent.GetCurrentValue(), newValueInstance); // if old value is not null remove parent/source from it and release it if (oldValueModelItem != null) { ((IModelTreeItem)oldValueModelItem).RemoveSource(this); parent.ModelTreeManager.ReleaseModelItem(oldValueModelItem, this.Parent); } // if new value is non null, update parent/source for it. if (newValueModelItem != null) { parent.ModelTreeManager.ReAddModelItemToModelTree(newValueModelItem); parent.ModelPropertyStore[this.Name] = newValueModelItem; ((IModelTreeItem)newValueModelItem).SetSource(this); } else { parent.ModelPropertyStore.Remove(this.Name); } // notify observers ((IModelTreeItem)this.Parent).OnPropertyChanged(this.Name); return newValueInstance; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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