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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.Workflow.ComponentModel.Design
{
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Runtime;
using System.ServiceModel;
using System.Workflow.ComponentModel;
// <summary>
// This the the class that implements the Search by menu item displayed on the activityDesigner
// this is responsible for finding the matching activity designers and displaying them using
// the acticvitydesigner hightlighter.
// </summary>
internal class FindSimilarActivitiesVerb<TActivity> : ActivityDesignerVerb where TActivity : Activity
{
List<ActivityDesigner> matchingActivityDesigner;
ActivityComparer<TActivity> matchMaker;
ActivityDesigner owner;
public FindSimilarActivitiesVerb(ActivityDesigner designer, ActivityComparer<TActivity> matchMaker, string displayText)
: base(designer, DesignerVerbGroup.Misc, displayText, new EventHandler(OnInvoke))
{
Fx.Assert(designer != null,
"Received null for designer parameter to FindSimilarActivitiesVerb ctor.");
Fx.Assert(matchMaker != null,
"Received null for matchMaker parameter to FindSimilarActivitiesVerb ctor.");
this.owner = designer;
this.matchMaker = matchMaker;
}
private static void OnInvoke(object source, EventArgs e)
{
FindSimilarActivitiesVerb<TActivity> designerVerb = source as FindSimilarActivitiesVerb<TActivity>;
ActivityDesigner activityDesigner = designerVerb.owner;
List<ActivityDesigner> highlightedDesigners = designerVerb.GetMatchingActivityDesigners(activityDesigner);
ActivityDesignerHighlighter hightlighter = new ActivityDesignerHighlighter(activityDesigner);
hightlighter.Highlight(highlightedDesigners);
}
private ActivityDesigner GetDesigner(Activity activity)
{
IDesignerHost designerHost = this.GetService(typeof(IDesignerHost)) as IDesignerHost;
return designerHost.GetDesigner(activity as IComponent) as ActivityDesigner;
}
private List<ActivityDesigner> GetMatchingActivityDesigners(ActivityDesigner activityDesigner)
{
CompositeActivityDesigner rootDesigner = DesignerPainter.GetRootDesigner(activityDesigner);
matchingActivityDesigner = new List<ActivityDesigner>();
Walker activityTreeWalker = new Walker();
activityTreeWalker.FoundActivity += new WalkerEventHandler(OnWalkerFoundActivity);
activityTreeWalker.Walk(rootDesigner.Activity);
return matchingActivityDesigner;
}
private object GetService(Type serviceType)
{
if (serviceType == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("serviceType");
}
if (owner.Activity != null && owner.Activity.Site != null)
{
return owner.Activity.Site.GetService(serviceType);
}
else
{
return null;
}
}
private void OnWalkerFoundActivity(Walker walker, WalkerEventArgs eventArgs)
{
TActivity foundActivity = eventArgs.CurrentActivity as TActivity;
if (foundActivity != null)
{
if (this.matchMaker((TActivity) owner.Activity, foundActivity))
{
matchingActivityDesigner.Add(GetDesigner(eventArgs.CurrentActivity));
}
}
}
}
}
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