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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / View / TypeKeyValue.cs / 1305376 / TypeKeyValue.cs
namespace System.Activities.Presentation.View { using System; using System.Collections.ObjectModel; using System.ComponentModel; using System.Windows; using System.Windows.Automation.Peers; using System.Windows.Input; //helper class, used to resolve generics. supports cascading generic type arguments (i.e. IList< IList < int > >) internal class TypeKeyValue : INotifyPropertyChanged { string errorText; //generic type Type genericType; bool isValid = true; //generic's type generic parameters ObservableCollection < TypeKeyValue > subTypes = new ObservableCollection < TypeKeyValue >(); //target type Type targetType; //type resolver reference Action < TypeKeyValue > typeChangedCallBack; //if this type is selected bool isSelected; Funcfilter; ObservableCollection mostRecentlyUsedTypes; //if type presenter should skip the drop down list bool browseTypeDirectly = true; public TypeKeyValue(Type genericType, Action < TypeKeyValue > typeChangedCallBack) { this.GenericType = genericType; this.typeChangedCallBack = typeChangedCallBack; } public event PropertyChangedEventHandler PropertyChanged; public string ErrorText { get { return this.errorText; } set { this.errorText = value; OnPropertyChanged("ErrorText"); } } public Type GenericType { get { return this.genericType; } set { this.genericType = value; OnPropertyChanged("GenericType"); } } public bool IsSelected { get { return this.isSelected; } set { this.isSelected = value; OnPropertyChanged("IsSelected"); } } public Func Filter { get { return this.filter; } set { this.filter = value; OnPropertyChanged("Filter"); } } public ObservableCollection MostRecentlyUsedTypes { get { return this.mostRecentlyUsedTypes; } set { this.mostRecentlyUsedTypes = value; OnPropertyChanged("MostRecentlyUsedTypes"); } } public bool BrowseTypeDirectly { get { return this.browseTypeDirectly; } set { this.browseTypeDirectly = value; OnPropertyChanged("BrowseTypeDirectly"); } } public bool IsValid { get { return this.isValid; } set { this.isValid = value; OnPropertyChanged("IsValid"); } } public ObservableCollection < TypeKeyValue > SubTypes { get { return this.subTypes; } } public Type TargetType { get { return this.targetType; } set { this.targetType = value; //whenever target type changes, check if there are some generic parameters required LoadGenericTypes(); OnPropertyChanged("TargetType"); if (typeChangedCallBack != null) { typeChangedCallBack(this); } } } public Type GetConcreteType() { Type result = null; if (null != this.targetType) { //do we have generic? if (this.targetType.IsGenericTypeDefinition) { //resolve all generic arguments Type[] arguments = new Type[this.subTypes.Count]; bool isValid = true; for (int i = 0; i < this.subTypes.Count && isValid; ++i) { arguments[i] = this.subTypes[i].GetConcreteType(); isValid = (null != arguments[i]); } if (isValid) { //and create target type result = this.targetType.MakeGenericType(arguments); } } else { result = targetType; } } return result; } void LoadGenericTypes() { this.subTypes.Clear(); if (null != this.targetType && this.targetType.IsGenericTypeDefinition) { Type[] generics = this.targetType.GetGenericArguments(); foreach (Type t in generics) { TypeKeyValue entry = new TypeKeyValue(t, typeChangedCallBack); this.subTypes.Add(entry); typeChangedCallBack(entry); } } } void OnPropertyChanged(string propertyName) { if (null != PropertyChanged) { PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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