BorderGapMaskConverter.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Controls / BorderGapMaskConverter.cs / 1 / BorderGapMaskConverter.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: Used to create a Gap in the Border for GroupBox style 
// 
//---------------------------------------------------------------------------
 
using System.Globalization;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Media; 
using System.Windows.Shapes;
 
namespace System.Windows.Controls 
{
    ///  
    /// BorderGapMaskConverter class
    /// 
    public class BorderGapMaskConverter : IMultiValueConverter
    { 

        ///  
        /// Convert a value. 
        /// 
        /// values as produced by source binding 
        /// target type
        /// converter parameter
        /// culture information
        ///  
        /// Converted value.
        /// Visual Brush that is used as the opacity mask for the Border 
        /// in the style for GroupBox. 
        /// 
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) 
        {
            //
            // Parameter Validation
            // 

            Type doubleType = typeof(double); 
 
            if (parameter == null ||
                values == null || 
                values.Length != 3 ||
                values[0] == null ||
                values[1] == null ||
                values[2] == null || 
                !doubleType.IsAssignableFrom(values[0].GetType()) ||
                !doubleType.IsAssignableFrom(values[1].GetType()) || 
                !doubleType.IsAssignableFrom(values[2].GetType()) ) 
            {
                return DependencyProperty.UnsetValue; 
            }

            Type paramType = parameter.GetType();
            if (!(doubleType.IsAssignableFrom(paramType) || typeof(string).IsAssignableFrom(paramType))) 
            {
                return DependencyProperty.UnsetValue; 
            } 

            // 
            // Conversion
            //

            double headerWidth = (double)values[0]; 
            double borderWidth = (double)values[1];
            double borderHeight = (double)values[2]; 
 
            // Doesn't make sense to have a Grid
            // with 0 as width or height 
            if (borderWidth == 0
                || borderHeight == 0)
            {
                return null; 
            }
 
            // Width of the line to the left of the header 
            // to be used to set the width of the first column of the Grid
            double lineWidth; 
            if (parameter is string)
            {
                lineWidth = Double.Parse(((string)parameter), NumberFormatInfo.InvariantInfo);
            } 
            else
            { 
                lineWidth = (double)parameter; 
            }
 
            Grid grid = new Grid();
            grid.Width = borderWidth;
            grid.Height = borderHeight;
            ColumnDefinition colDef1 = new ColumnDefinition(); 
            ColumnDefinition colDef2 = new ColumnDefinition();
            ColumnDefinition colDef3 = new ColumnDefinition(); 
            colDef1.Width = new GridLength(lineWidth); 
            colDef2.Width = new GridLength(headerWidth);
            colDef3.Width = new GridLength(1, GridUnitType.Star); 
            grid.ColumnDefinitions.Add(colDef1);
            grid.ColumnDefinitions.Add(colDef2);
            grid.ColumnDefinitions.Add(colDef3);
            RowDefinition rowDef1 = new RowDefinition(); 
            RowDefinition rowDef2 = new RowDefinition();
            rowDef1.Height = new GridLength(borderHeight / 2); 
            rowDef2.Height = new GridLength(1, GridUnitType.Star); 
            grid.RowDefinitions.Add(rowDef1);
            grid.RowDefinitions.Add(rowDef2); 

            Rectangle rectColumn1 = new Rectangle();
            Rectangle rectColumn2 = new Rectangle();
            Rectangle rectColumn3 = new Rectangle(); 
            rectColumn1.Fill = Brushes.Black;
            rectColumn2.Fill = Brushes.Black; 
            rectColumn3.Fill = Brushes.Black; 

            Grid.SetRowSpan(rectColumn1, 2); 
            Grid.SetRow(rectColumn1, 0);
            Grid.SetColumn(rectColumn1, 0);

            Grid.SetRow(rectColumn2, 1); 
            Grid.SetColumn(rectColumn2, 1);
 
            Grid.SetRowSpan(rectColumn3, 2); 
            Grid.SetRow(rectColumn3, 0);
            Grid.SetColumn(rectColumn3, 2); 

            grid.Children.Add(rectColumn1);
            grid.Children.Add(rectColumn2);
            grid.Children.Add(rectColumn3); 

            return (new VisualBrush(grid)); 
        } 

        ///  
        /// Not Supported
        /// 
        /// value, as produced by target
        /// target types 
        /// converter parameter
        /// culture information 
        /// Nothing 
        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
        { 
            return new object[] { Binding.DoNothing };
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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BorderGapMaskConverter.cs source code in C# .NET

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