WorkflowViewManager.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / View / WorkflowViewManager.cs / 1407647 / WorkflowViewManager.cs
                        
                        
                            //---------------------------------------------------------------- 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//---------------------------------------------------------------

namespace System.Activities.Presentation.View 
{
    using System.Windows; 
 
    using System.Windows.Media;
    using System.Windows.Media.Effects; 
    using System.Windows.Documents;

    using System.Activities.Presentation;
    using System.Activities.Presentation.View; 
    using System.Activities.Presentation.Hosting;
    using System.Activities.Presentation.Model; 
    using System.Activities.Presentation.Documents; 
    using System.Activities.Presentation.Services;
    using System.Collections.ObjectModel; 
    using System.Collections;
    using System.Collections.Generic;
    using System.Runtime;
    using System.ComponentModel.Design; 

 
    internal class WorkflowViewManager : ViewManager 
    {
        const string KeywordForWorkflowDesignerHomePage = "DefaultWorkflowDesigner"; 
        EditingContext context;
        Selection oldSelection;
        ModelService modelService;
        System.Activities.Presentation.View.DesignerView view; 
        AttachedProperty isPrimarySelectionProperty;
        AttachedProperty isSelectionProperty; 
        IIntegratedHelpService helpService; 

        public override System.Windows.Media.Visual View 
        {
            get
            {
                return view; 
            }
        } 
        public override void Initialize(EditingContext context) 
        {
            this.context = context; 
            AttachedPropertiesService propertiesService = this.context.Services.GetService();
            helpService = this.context.Services.GetService();

            oldSelection = this.context.Items.GetValue(); 
            isPrimarySelectionProperty = new AttachedProperty()
                { 
                    Getter = (modelItem) => (this.context.Items.GetValue().PrimarySelection == modelItem), 
                    Name = "IsPrimarySelection",
                    OwnerType = typeof(Object) 
                };

            isSelectionProperty = new AttachedProperty()
            { 
                Getter = (modelItem) => (((IList)this.context.Items.GetValue().SelectedObjects).Contains(modelItem)),
                Name = "IsSelection", 
                OwnerType = typeof(Object) 
            };
 

            propertiesService.AddProperty(isPrimarySelectionProperty);
            propertiesService.AddProperty(isSelectionProperty);
 

 
 
            if (this.context.Services.GetService() == null)
            { 
                view = new System.Activities.Presentation.View.DesignerView(this.context);
                WorkflowViewService viewService = new WorkflowViewService(context);
                WorkflowViewStateService viewStateService = new WorkflowViewStateService(context);
                this.context.Services.Publish(viewService); 
                this.context.Services.Publish(new VirtualizedContainerService(this.context));
                this.context.Services.Publish(viewStateService); 
                this.context.Services.Publish(view); 
                this.context.Services.Subscribe(delegate(ModelService modelService)
                { 
                    this.modelService = modelService;
                    if (modelService.Root != null)
                    {
                        view.MakeRootDesigner(modelService.Root); 
                    }
                    view.RestoreDesignerStates(); 
                    this.context.Items.Subscribe(new SubscribeContextCallback(OnItemSelected)); 
                });
            } 

            if (helpService != null)
            {
                helpService.AddContextAttribute(string.Empty, KeywordForWorkflowDesignerHomePage, HelpKeywordType.F1Keyword); 
            }
        } 
 
        internal static string GetF1HelpTypeKeyword(Type type)
        { 
            Fx.Assert(type != null, "type is null");
            if (type.IsGenericType)
            {
                Type genericTypeDefinition = type.GetGenericTypeDefinition(); 
                return genericTypeDefinition.FullName;
            } 
            return type.FullName; 
        }
 
        void OnItemSelected(Selection newSelection)
        {
            Fx.Assert(newSelection != null, "newSelection is null");
            IList newSelectionObjects = newSelection.SelectedObjects as IList; 
            IList oldSelectionObjects = oldSelection.SelectedObjects as IList;
 
            //Call notifyPropertyChanged for IsPrimarySelection attached property. 
            if (newSelection.PrimarySelection != null && !newSelection.PrimarySelection.Equals(oldSelection.PrimarySelection))
            { 
                isPrimarySelectionProperty.NotifyPropertyChanged(oldSelection.PrimarySelection);
                isPrimarySelectionProperty.NotifyPropertyChanged(newSelection.PrimarySelection);
            }
            else if (newSelection.PrimarySelection == null) 
            {
                isPrimarySelectionProperty.NotifyPropertyChanged(oldSelection.PrimarySelection); 
            } 

 
            //call NotifyPropertyChanged for IsSelection property on ModelItems that were added or removed from selection.
            HashSet selectionChangeSet = new HashSet(oldSelectionObjects);
            selectionChangeSet.SymmetricExceptWith(newSelectionObjects);
            foreach (ModelItem selectionChangeMI in selectionChangeSet) 
            {
                isSelectionProperty.NotifyPropertyChanged(selectionChangeMI); 
            } 

            if (helpService != null) 
            {
                if (oldSelection.PrimarySelection != null)
                {
                    helpService.RemoveContextAttribute(string.Empty, GetF1HelpTypeKeyword(oldSelection.PrimarySelection.ItemType)); 
                }
 
                if (newSelection.PrimarySelection != null) 
                {
                    helpService.AddContextAttribute(string.Empty, GetF1HelpTypeKeyword(newSelection.PrimarySelection.ItemType), HelpKeywordType.F1Keyword); 
                }
            }
            oldSelection = newSelection;
        } 

 
    } 

 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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WorkflowViewManager.cs source code in C# .NET

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