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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.Workflow.ComponentModel.Design
{
using System;
using System.Collections.Generic;
using System.Text;
using System.Workflow.ComponentModel.Design;
using System.Windows.Forms;
using System.Reflection;
using System.Drawing;
using System.Diagnostics;
using System.ServiceModel;
// <summary>
// This is a helper class with static methods that dont fit anywhere but are useful in general
// </summary>
internal static class DesignerPainter
{
public static CompositeActivityDesigner GetRootDesigner(ActivityDesigner designer)
{
if (designer == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("designer");
}
CompositeActivityDesigner rootDesigner = designer.ParentDesigner;
while (!rootDesigner.IsRootDesigner && rootDesigner.ParentDesigner != null)
{
rootDesigner = rootDesigner.ParentDesigner;
}
return rootDesigner;
}
public static void PaintDesigner(ActivityDesigner activityDesigner, ActivityDesignerPaintEventArgs eventArgs)
{
if (activityDesigner == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("activityDesigner");
}
if (eventArgs == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("eventArgs");
}
ActivityDesigner parentDesigner = activityDesigner.ParentDesigner;
if (parentDesigner == null)
{
// This designer is no more on the design surface , dont paint this.
return;
}
if (!IsBranchVisible(activityDesigner))
{
return;
}
// special case designers contained inside activity preview designers ( only one of the contained designers is shown)
bool visible = false;
if (IsInsidePreviewDesignerBranch(activityDesigner, out visible))
{
if (visible)
{
PaintDesignerInternal(activityDesigner, eventArgs);
}
}
else
{
PaintDesignerInternal(activityDesigner, eventArgs);
}
}
private static bool IsBranchVisible(ActivityDesigner activityDesigner)
{
ActivityDesigner currentDesigner = activityDesigner;
ActivityDesigner parentDesigner = activityDesigner.ParentDesigner;
while (!currentDesigner.IsRootDesigner)
{
if (!((CompositeActivityDesigner) parentDesigner).ContainedDesigners.Contains(currentDesigner))
{
return false;
}
else
{
currentDesigner = parentDesigner;
parentDesigner = parentDesigner.ParentDesigner;
}
}
return true;
}
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1800:DoNotCastUnnecessarily")]
// The above suppression is required because, the parentDesigner object is changeing inside the loop and it is
// not possible to cache the result of the cast as suggested by FxCop
private static bool IsInsidePreviewDesignerBranch(ActivityDesigner activityDesigner, out bool visible)
{
visible = false;
ActivityDesigner currentDesigner = activityDesigner;
ActivityDesigner parentDesigner = activityDesigner.ParentDesigner;
while (!currentDesigner.IsRootDesigner)
{
if (parentDesigner is ActivityPreviewDesigner)
{
break;
}
else
{
currentDesigner = parentDesigner;
parentDesigner = parentDesigner.ParentDesigner;
}
}
if (parentDesigner is ActivityPreviewDesigner)
{
if (((ActivityPreviewDesigner) parentDesigner).IsContainedDesignerVisible(currentDesigner))
{
visible = true;
}
return true;
}
return false;
}
private static void PaintDesignerInternal(ActivityDesigner activityDesigner, ActivityDesignerPaintEventArgs eventArgs)
{
IWorkflowDesignerMessageSink sink = (IWorkflowDesignerMessageSink) activityDesigner;
sink.OnPaint(new PaintEventArgs(eventArgs.Graphics, eventArgs.ClipRectangle), eventArgs.ClipRectangle);
}
}
}
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