Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / Model / FakeModelPropertyImpl.cs / 1305376 / FakeModelPropertyImpl.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace System.Activities.Presentation.Model { using System.ComponentModel; using System.Diagnostics; using System.Globalization; ////// FakeModelPropertyImpl. This class is used with FakeModelItemImpl. it is used to allow full model editing expirience /// without actually modyfing actual model tree. Even though reference to ModelTreeManager is availabe, changes made to object /// using this class are not reflected in actual model. Especially, any changes made here do not affect undo/redo stack. /// see aslo DesignObjectWrapper class for more usage details /// sealed class FakeModelPropertyImpl : ModelPropertyImpl { IModelTreeItem parentModelTreeItem; FakeModelItemImpl temporaryValue; bool isSettingValue = false; public FakeModelPropertyImpl(FakeModelItemImpl parent, PropertyDescriptor propertyDescriptor) : base(parent, propertyDescriptor,false) { this.parentModelTreeItem = (IModelTreeItem)parent; } //no collection support public override ModelItemCollection Collection { get { return null; } } public override bool IsCollection { get { return false; } } //no dictionary support public override ModelItemDictionary Dictionary { get { return null; } } public override bool IsDictionary { get { return false; } } public override ModelItem Value { get { ModelItem result = null; object parentObject = this.parentModelTreeItem.ModelItem.GetCurrentValue(); result = this.StoreValue(this.PropertyDescriptor.GetValue(parentObject)); return result; } } public override void ClearValue() { //try setting default value this.SetValue(this.DefaultValue); } public override ModelItem SetValue(object value) { //are we already setting value? if (!isSettingValue) { try { this.isSettingValue = true; //create new value this.temporaryValue = this.WrapValue(value); //is there a value stored already? if (this.parentModelTreeItem.ModelPropertyStore.ContainsKey(this.Name)) { //yes - cleanup references IModelTreeItem item = (IModelTreeItem)this.parentModelTreeItem.ModelPropertyStore[this.Name]; item.RemoveSource(this); item.RemoveParent(this.parentModelTreeItem.ModelItem); //and remove it this.parentModelTreeItem.ModelPropertyStore.Remove(this.Name); } //set it onto underlying object this.PropertyDescriptor.SetValue(this.Parent.GetCurrentValue(), (null != this.temporaryValue ? this.temporaryValue.GetCurrentValue() : null)); //store it in parent's store this.temporaryValue = this.StoreValue(this.temporaryValue); //notify listeners - notification must be postponed until actual underlying object value is updated, otherwise, listeners might get old value this.parentModelTreeItem.ModelTreeManager.AddToCurrentEditingScope(new FakeModelNotifyPropertyChange(this.parentModelTreeItem, this.Name)); } catch (ValidationException e) { Trace.WriteLine(e.ToString()); //it is important to rethrow exception here - otherwise, DataGrid will assume operation completed successfully throw; } finally { this.isSettingValue = false; } } return this.temporaryValue; } FakeModelItemImpl WrapValue(object value) { FakeModelItemImpl wrappedValue = value as FakeModelItemImpl; if (null == wrappedValue && null != value) { wrappedValue = new FakeModelItemImpl(this.parentModelTreeItem.ModelTreeManager, this.PropertyType, value, (FakeModelItemImpl)this.Parent); } return wrappedValue; } FakeModelItemImpl StoreValue(object value) { FakeModelItemImpl wrappedValue = WrapValue(value); if (null != wrappedValue) { this.parentModelTreeItem.ModelPropertyStore[this.Name] = wrappedValue; IModelTreeItem modelTreeItem = (IModelTreeItem)wrappedValue; modelTreeItem.SetSource(this); } else { ModelItem existing = null; if (this.parentModelTreeItem.ModelPropertyStore.TryGetValue(this.Name, out existing)) { IModelTreeItem modelTreeItem = (IModelTreeItem)existing; modelTreeItem.RemoveSource(this); modelTreeItem.RemoveParent(this.Parent); } this.parentModelTreeItem.ModelPropertyStore.Remove(this.Name); } return wrappedValue; } } //helper class - implements change //FakeModelPropery uses instance of this class to notify all listeners that property value has changed. the notification is deffered untill all editing operations //have completed, so the listener will get notified after edit is completed sealed class FakeModelNotifyPropertyChange : ModelChange { IModelTreeItem modelTreeItem; string propertyName; public FakeModelNotifyPropertyChange(IModelTreeItem modelTreeItem, string propertyName) { this.modelTreeItem = modelTreeItem; this.propertyName = propertyName; } public override string Description { get { return this.GetType().Name; } } public override bool Apply() { if (this.modelTreeItem != null) { EditingContext context = this.modelTreeItem.ModelTreeManager.Context; //this change shouldn't participate in Undo/Redo if (null != context && !context.Services.GetService().IsUndoRedoInProgress) { this.modelTreeItem.OnPropertyChanged(this.propertyName); } } //return false here - i don't need that change in the change list return false; } public override Change GetInverse() { //this change shouldn't participate in Undo/Redo return null; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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