BreadCrumbTextConverter.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / View / BreadCrumbTextConverter.cs / 1305376 / BreadCrumbTextConverter.cs
                        

                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.Activities.Presentation.View 
{
    using System.Windows.Data; 
    using System.Activities.Presentation.Model; 

    internal class BreadCrumbTextConverter : IMultiValueConverter 
    {
        const int MaxDisplayNameLength = 20;
        double pixelsPerChar = 6.5;
 
        internal double PixelsPerChar
        { 
            get { return this.pixelsPerChar; } 
            set { this.pixelsPerChar = Math.Max(5.0, value); }
        } 

        public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            int actualDisplayNameLength = MaxDisplayNameLength; 
            ModelItem boundModelItem = values[0] as ModelItem;
 
            // default to root item's typename 
            string breadCrumbText = (null != boundModelItem ? boundModelItem.ItemType.Name : "");
            // if there is a display name property on root use that as the file name. 
            if (values[1] is ModelItem)
            {
                ModelItem displayNameProperty = (ModelItem)values[1];
                if (typeof(string) == displayNameProperty.ItemType) 
                {
                    values[1] = displayNameProperty.GetCurrentValue(); 
                } 
            }
            if (values[1] is string) 
            {
                string displayName = (string)values[1];
                if (!displayName.Equals(string.Empty))
                { 
                    breadCrumbText = displayName;
                } 
            } 
            if (values.Length == 3 && values[2] is double)
            { 
                double actualControlWidth = (double)values[2];
                actualDisplayNameLength = (int)Math.Max(MaxDisplayNameLength, actualControlWidth / pixelsPerChar);

            } 
            if (breadCrumbText.Length > actualDisplayNameLength)
            { 
                breadCrumbText = breadCrumbText.Substring(0, actualDisplayNameLength - 3) + "..."; 
            }
            return breadCrumbText; 
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
        { 
            throw FxTrace.Exception.AsError(new InvalidOperationException());
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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