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//----------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------
namespace System.Activities.Presentation
{
using System.ComponentModel;
using System.Activities.Statements;
using System.Activities.Presentation.Metadata;
using System.Activities.Presentation.Model;
using System.Activities.Presentation.View;
using System.Activities.Core.Presentation.Themes;
using System.Linq;
using System.Activities.Core.Presentation;
using System.Diagnostics.CodeAnalysis;
using System.ServiceModel.Activities;
using System.Windows;
using System.Runtime;
using System.Globalization;
static class ActivityDesignerHelper
{
public const string ChannelBasedCorrelationKey = "ChannelBasedCorrelation";
[SuppressMessage("Microsoft.Design", "CA1021:AvoidOutParameters",
Justification = "This is a TryGet pattern that requires out parameters")]
public static bool IsItemInSequence(this ModelItem item, out ModelItem sequence)
{
if (null == item)
{
throw FxTrace.Exception.AsError(new ArgumentNullException("item"));
}
bool result = false;
int level = 0;
Func<ModelItem, bool> isInSequencePredicate = (p) =>
{
switch (level)
{
case 0:
++level;
return (p is ModelItemCollection);
case 1:
++level;
result = typeof(Sequence).IsAssignableFrom(p.ItemType);
return result;
default:
return false;
};
};
ModelItem container = item.GetParentEnumerator(isInSequencePredicate).LastOrDefault();
sequence = result ? container : null;
return result;
}
[SuppressMessage("Microsoft.Design", "CA1021:AvoidOutParameters",
Justification = "This is a TryGet pattern that requires out parameters")]
public static bool IsItemInFlowchart(this ModelItem item, out ModelItem flowchart, out ModelItem flowStep)
{
if (null == item)
{
throw FxTrace.Exception.AsError(new ArgumentNullException("item"));
}
bool result = false;
int level = 0;
ModelItem flowStepContainer = null;
flowchart = null;
flowStep = null;
Func<ModelItem, bool> isInFlowchartPredicate = (p) =>
{
switch (level)
{
case 0:
++level;
flowStepContainer = typeof(FlowStep).IsAssignableFrom(p.ItemType) ? p : null;
return null != flowStepContainer;
case 1:
++level;
return (p is ModelItemCollection);
case 2:
++level;
result = (typeof(Flowchart).IsAssignableFrom(p.ItemType));
return result;
default:
return false;
}
};
ModelItem container = item.GetParentEnumerator(isInFlowchartPredicate).LastOrDefault();
if (result)
{
flowchart = container;
flowStep = flowStepContainer;
}
return result;
}
public static bool IsMessagingActivity(this ModelItem item)
{
if (null == item)
{
throw FxTrace.Exception.ArgumentNull("item");
}
bool result =
item.IsAssignableFrom<Receive>() ||
item.IsAssignableFrom<Send>() ||
item.IsAssignableFrom<ReceiveReply>() ||
item.IsAssignableFrom<SendReply>();
return result;
}
public static string GenerateUniqueVariableNameForContext(DependencyObject context, string prefix)
{
if (null == context)
{
throw FxTrace.Exception.ArgumentNull("context");
}
var viewElement = context as WorkflowViewElement;
if (null == viewElement)
{
var msg = StringResourceDictionary.Instance.GetString("activityFactoryWrongTarget");
throw FxTrace.Exception.Argument("target", msg);
}
string name;
var scope = VariableHelper.FindCommonVariableScope(viewElement.ModelItem, viewElement.ModelItem);
if (null == scope)
{
name = string.Format(CultureInfo.CurrentUICulture, "{0}{1}", prefix, 1);
}
else
{
name = scope.GetVariableCollection().CreateUniqueVariableName(prefix, 1);
}
return name;
}
}
}
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