+++ /dev/null
-//----------------------------------------------------------------
-// Copyright (c) Microsoft Corporation. All rights reserved.
-//----------------------------------------------------------------
-
-namespace System.Activities.Presentation
-{
- using System.Diagnostics.CodeAnalysis;
-
-
- using System;
- using System.Collections.Generic;
-
- // <summary>
- // The ContextItem class is the base class from which all context items must derive.
- // </summary>
- public abstract class ContextItem
- {
-
- // <summary>
- // Creates a new ContextItem.
- // </summary>
- protected ContextItem()
- {
- }
-
- // <summary>
- // Returns the item type for this editing context item. Context items are
- // considered unique based on their item type. By using ItemType to identify
- // a type of context item we allow several derived versions of context items to
- // be cataloged under the same key in the editing context.
- // </summary>
- // <value></value>
- public abstract Type ItemType
- { get; }
-
- // <summary>
- // This method is called on a context item before it is stored in the context item
- // manager. The previous item in the context item manager is passed.
- // </summary>
- // <param name="context">The editing context that is making this change.</param>
- // <param name="previousItem">The previously active item in the context. Because items must have default constructors a default item will be fabricated if an item is first passed into the context.</param>
- // <returns></returns>
- protected virtual void OnItemChanged(EditingContext context, ContextItem previousItem)
- {
- }
-
- //
- // Internal API that calls OnItemChanged. This is invoked from the
- // abstract ContextItemManager class so deriving classes can still
- // invoke it.
- //
- internal void InvokeOnItemChanged(EditingContext context, ContextItem previousItem)
- {
- OnItemChanged(context, previousItem);
- }
- }
-}