ActivityDesignerHighlighter.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx35 / System.WorkflowServices / System / Workflow / ComponentModel / Design / ActivityDesignerHighlighter.cs / 1305376 / ActivityDesignerHighlighter.cs
                        
                        
                            //------------------------------------------------------------ 
// 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.ComponentModel.Design;
    using System.Drawing;
    using System.ServiceModel;
 

    //  
    // Helper class for visuaulizing the highlighted activity group 
    // 
    class ActivityDesignerHighlighter : IServiceProvider 
    {
        private IDesignerGlyphProviderService glyphProviderService;
        private HighlightGlyphProvider highlightProvider = null;
        private ActivityDesigner owner; 
        private WorkflowView workflowView;
        public ActivityDesignerHighlighter(ActivityDesigner owner) 
        { 
            this.owner = owner;
        } 

        public 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; 
            } 
        }
 
        public void Highlight(List highlightedDesigners)
        {
            if (highlightedDesigners == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("hightlightedDesigners");
            } 
 
            glyphProviderService = this.GetService(typeof(IDesignerGlyphProviderService)) as IDesignerGlyphProviderService;
            workflowView = GetService(typeof(WorkflowView)) as WorkflowView; 

            RemoveCurrentHighlight();

            IDesignerHost designerHost = this.GetService(typeof(IDesignerHost)) as IDesignerHost; 
            DesignerHighlighterMesageFilter messageFilter = new DesignerHighlighterMesageFilter();
            highlightProvider = new HighlightGlyphProvider(designerHost.GetDesigner(designerHost.RootComponent) as ActivityDesigner, highlightedDesigners); 
            glyphProviderService.AddGlyphProvider(highlightProvider); 
            highlightProvider.MessageFilter = messageFilter;
 
            messageFilter.MouseDown += new EventHandler(messageFilter_MouseDown);
            messageFilter.KeyDown += new EventHandler(messageFilter_KeyDown);
            workflowView.AddDesignerMessageFilter(messageFilter);
            workflowView.FitToScreenSize(); 
        }
 
        public void RemoveCurrentHighlight() 
        {
            HighlightGlyphProvider currentHightlightGlyhProvider = null; 
            foreach (IDesignerGlyphProvider glyphProvider in glyphProviderService.GlyphProviders)
            {
                if (glyphProvider is HighlightGlyphProvider)
                { 
                    currentHightlightGlyhProvider = (HighlightGlyphProvider) glyphProvider;
                    break; 
                } 
            }
            if (currentHightlightGlyhProvider != null) 
            {
                //remove associated designerMessageFilter before removing currentGlyphProvider.
                workflowView.RemoveDesignerMessageFilter(currentHightlightGlyhProvider.MessageFilter);
                glyphProviderService.RemoveGlyphProvider(currentHightlightGlyhProvider); 
            }
 
        } 

        void messageFilter_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) 
        {
            glyphProviderService.RemoveGlyphProvider(highlightProvider);
            if (workflowView != null)
            { 
                workflowView.RemoveDesignerMessageFilter(sender as WorkflowDesignerMessageFilter);
                Point scrollPosition = workflowView.ClientPointToLogical(owner.Location); 
                workflowView.FitToWorkflowSize(); 
                // try to center the owner designer int the the workflowview
                Size viewSize = workflowView.ClientSizeToLogical(workflowView.ViewPortSize); 
                if (scrollPosition.Y > viewSize.Height / 2)
                {
                    scrollPosition.Y -= viewSize.Height / 2;
                } 
                if (scrollPosition.X > viewSize.Width / 2)
                { 
                    scrollPosition.X -= viewSize.Width / 2; 
                }
                workflowView.ScrollPosition = scrollPosition; 
            }
        }

        void messageFilter_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) 
        {
            glyphProviderService.RemoveGlyphProvider(highlightProvider); 
            if (workflowView != null) 
            {
                workflowView.RemoveDesignerMessageFilter(sender as WorkflowDesignerMessageFilter); 
                Point scrollPosition = workflowView.ClientPointToLogical(e.Location);
                workflowView.FitToWorkflowSize();
                // try to center the clicked portion of the workflow in the workflowview
                Size viewSize = workflowView.ClientSizeToLogical(workflowView.ViewPortSize); 
                if (scrollPosition.Y > viewSize.Height / 2)
                { 
                    scrollPosition.Y -= viewSize.Height / 2; 
                }
                if (scrollPosition.X > viewSize.Width / 2) 
                {
                    scrollPosition.X -= viewSize.Width / 2;
                }
                workflowView.ScrollPosition = scrollPosition; 
            }
        } 
 
        // this is the message filter inserted in the workflowview to escape back to the normal view
        // from the highlighted view. since glyphs cant take mouse events, this is the only way to 
        // detect mouseclicks when in highlighted view.

        internal sealed class DesignerHighlighterMesageFilter : WorkflowDesignerMessageFilter
        { 
            public event EventHandler KeyDown;
            public event EventHandler MouseDown; 
 
            protected override bool OnKeyDown(System.Windows.Forms.KeyEventArgs eventArgs)
            { 
                if (KeyDown != null)
                {
                    KeyDown(this, eventArgs);
                } 
                // let event pass down to others. we dont want to mark it as handled
                return false; 
            } 

            protected override bool OnMouseDown(System.Windows.Forms.MouseEventArgs eventArgs) 
            {
                if (MouseDown != null)
                {
                    MouseDown(this, eventArgs); 
                }
                // let event pass down to others. we dont want to mark it as handled 
                return false; 
            }
        } 

        internal sealed class HighlightGlyphProvider : IDesignerGlyphProvider
        {
            private List highlightedDesigners; 
            private DesignerHighlighterMesageFilter messageFilter;
 
            private ActivityDesigner rootDesigner; 

            public HighlightGlyphProvider(ActivityDesigner rootDesigner, List highlightedDesigners) 
            {

                this.RootDesigner = rootDesigner;
                this.HighlightedDesigners = highlightedDesigners; 
            }
 
            public List HighlightedDesigners 
            {
                get { return highlightedDesigners; } 
                set { highlightedDesigners = value; }
            }

            public DesignerHighlighterMesageFilter MessageFilter 
            {
                get { return messageFilter; } 
                set { messageFilter = value; } 
            }
 
            public ActivityDesigner RootDesigner
            {
                get { return rootDesigner; }
                set { rootDesigner = value; } 
            }
 
            public ActivityDesignerGlyphCollection GetGlyphs(ActivityDesigner activityDesigner) 
            {
                if (activityDesigner == null) 
                {
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("activityDesigner");
                }
 
                if (!activityDesigner.IsRootDesigner)
                { 
                    return null; 
                }
                ActivityDesignerGlyphCollection glyphs = new ActivityDesignerGlyphCollection(); 
                glyphs.Add(new HighlightOverlayGlyph(activityDesigner.Bounds, HighlightedDesigners));
                return glyphs;
            }
 
        }
 
    } 
}

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

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