TableLayoutSettingsTypeConverter.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / TableLayoutSettingsTypeConverter.cs / 2 / TableLayoutSettingsTypeConverter.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.MSInternal", "CA905:SystemAndMicrosoftNamespacesRequireApproval", Scope="namespace", Target="System.Windows.Forms.Layout")] 
namespace System.Windows.Forms.Layout { 

    using System; 
    using System.ComponentModel;
    using System.Xml;
    using System.Text;
    using System.Globalization; 
    using System.Diagnostics;
    using System.ComponentModel.Design.Serialization; 
 
    public class TableLayoutSettingsTypeConverter : TypeConverter {
 
        /// 
        /// 
        ///      Determines if this converter can convert an object in the given source
        ///      type to the native type of the converter. 
        /// 
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { 
            if (sourceType == typeof(string)) { 
                return true;
            } 
            return base.CanConvertFrom(context, sourceType);
        }

        ///  
        /// 
        ///    Gets a value indicating whether this converter can 
        ///       convert an object to the given destination type using the context. 
        /// 
        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { 
            if (destinationType == typeof(InstanceDescriptor) || destinationType == typeof(string)) {
                return true;
            }
            return base.CanConvertTo(context, destinationType); 
        }
 
        ///  
        /// 
        ///      Converts the given object to the converter's native type. 
        /// 
        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {

            if (value is string) { 
                XmlDocument tableLayoutSettingsXml = new XmlDocument();
                tableLayoutSettingsXml.LoadXml(value as string); 
 
                TableLayoutSettings settings = new TableLayoutSettings();
 
                ParseControls(settings, tableLayoutSettingsXml.GetElementsByTagName("Control"));
                ParseStyles(settings, tableLayoutSettingsXml.GetElementsByTagName("Columns"), /*isColumn=*/true);
                ParseStyles(settings, tableLayoutSettingsXml.GetElementsByTagName("Rows"), /*isColumn=*/false);
                return settings; 
            }
            return base.ConvertFrom(context, culture, value); 
        } 

 

        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
            if (destinationType == null) {
                throw new ArgumentNullException("destinationType"); 
            }
 
            if (value is TableLayoutSettings && (destinationType == typeof(string))) { 
                TableLayoutSettings tableLayoutSettings = value as TableLayoutSettings;
 
                StringBuilder xmlStringBuilder = new StringBuilder();
                XmlWriter xmlWriter = XmlWriter.Create(xmlStringBuilder);
                xmlWriter.WriteStartElement("TableLayoutSettings");
 
                //
                // write controls 
                // 
                xmlWriter.WriteStartElement("Controls");
 
                foreach (TableLayoutSettings.ControlInformation c in tableLayoutSettings.GetControlsInformation()) {


                    xmlWriter.WriteStartElement("Control"); 
                    xmlWriter.WriteAttributeString("Name", c.Name.ToString());
                    xmlWriter.WriteAttributeString("Row",c.Row.ToString(CultureInfo.CurrentCulture)); 
                    xmlWriter.WriteAttributeString("RowSpan", c.RowSpan.ToString(CultureInfo.CurrentCulture)); 

                    xmlWriter.WriteAttributeString("Column", c.Column.ToString(CultureInfo.CurrentCulture)); 
                    xmlWriter.WriteAttributeString("ColumnSpan", c.ColumnSpan.ToString(CultureInfo.CurrentCulture));

                    xmlWriter.WriteEndElement();
 
                }
                xmlWriter.WriteEndElement(); // end Controls 
 
                //
                // write columns 
                //
                xmlWriter.WriteStartElement("Columns");
                StringBuilder columnStyles = new StringBuilder();
                foreach (ColumnStyle colStyle in tableLayoutSettings.ColumnStyles) { 
                    columnStyles.AppendFormat("{0},{1},", colStyle.SizeType, colStyle.Width);
                } 
                if (columnStyles.Length > 0) { 
                    columnStyles.Remove(columnStyles.Length - 1, 1);
                } 
                xmlWriter.WriteAttributeString("Styles", columnStyles.ToString());
                xmlWriter.WriteEndElement(); // end columns

                // 
                // write rows
                // 
                xmlWriter.WriteStartElement("Rows"); 
                StringBuilder rowStyles = new StringBuilder();
                foreach (RowStyle rowStyle in tableLayoutSettings.RowStyles) { 
                    rowStyles.AppendFormat("{0},{1},", rowStyle.SizeType, rowStyle.Height);
                }
                if (rowStyles.Length > 0) {
                    rowStyles.Remove(rowStyles.Length - 1, 1); 
                }
                xmlWriter.WriteAttributeString("Styles", rowStyles.ToString()); 
                xmlWriter.WriteEndElement(); // end Rows 

 
                xmlWriter.WriteEndElement(); // end TableLayoutSettings

                xmlWriter.Close();
                return xmlStringBuilder.ToString(); 

            } 
            return base.ConvertTo(context, culture, value, destinationType); 
        }
 
        private string GetAttributeValue(XmlNode node, string attribute) {
            XmlAttribute attr = node.Attributes[attribute];
            if (attr != null) {
                return attr.Value; 
            }
            return null; 
        } 

        private int GetAttributeValue(XmlNode node, string attribute, int valueIfNotFound) { 
            string attributeValue = GetAttributeValue(node, attribute);
            if (!string.IsNullOrEmpty(attributeValue)) {
                int result;
                if (Int32.TryParse(attributeValue, out result)) { 
                    return result;
                } 
                // dont throw because we should just gracefully fall back to valueIfNotFound; 
                Debug.Fail(string.Format(CultureInfo.CurrentCulture, "Failed to parse int: {0}", attributeValue));
            } 
            return valueIfNotFound;
        }

 

       private void ParseControls(TableLayoutSettings settings, XmlNodeList controlXmlFragments) { 
           foreach (XmlNode controlXmlNode in controlXmlFragments) { 
               string name     = GetAttributeValue(controlXmlNode, "Name");
 
               if (!string.IsNullOrEmpty(name)) {
                   int row        = GetAttributeValue(controlXmlNode, "Row",       /*default*/-1);
                   int rowSpan    = GetAttributeValue(controlXmlNode, "RowSpan",   /*default*/1);
                   int column     = GetAttributeValue(controlXmlNode, "Column",    /*default*/-1); 
                   int columnSpan = GetAttributeValue(controlXmlNode, "ColumnSpan",/*default*/1);
 
                   settings.SetRow(name, row); 
                   settings.SetColumn(name, column);
                   settings.SetRowSpan(name, rowSpan); 
                   settings.SetColumnSpan(name, columnSpan);
               }

           } 

 
       } 

 
        private void ParseStyles(TableLayoutSettings settings, XmlNodeList controlXmlFragments, bool columns) {
            foreach (XmlNode styleXmlNode in controlXmlFragments) {
                string styleString = GetAttributeValue(styleXmlNode, "Styles");
                Type sizeTypeType = typeof(SizeType); 

                // styleString will consist of N Column/Row styles serialized in the following format 
                // (Percent | Absolute | AutoSize), (24 | 24.4 | 24,4) 
                // Two examples:
                // Percent,23.3,Percent,46.7,Percent,30 
                // Percent,23,3,Percent,46,7,Percent,30
                // Note we get either . or , based on the culture the TableLayoutSettings were serialized in

                if (!string.IsNullOrEmpty(styleString)) { 
                    int currentIndex = 0;
                    int nextIndex; 
                    while (currentIndex < styleString.Length) { 

                        // ---- SizeType Parsing ----------------- 
                        nextIndex = currentIndex;
                        while (Char.IsLetter(styleString[nextIndex])) {
                            nextIndex++;
                        } 
                        SizeType type = (SizeType)Enum.Parse(sizeTypeType, styleString.Substring(currentIndex, nextIndex - currentIndex), true);
 
                        // ----- Float Parsing -------------- 
                        // Find the next Digit (start of the float)
                        while (!char.IsDigit(styleString[nextIndex])) { 
                            nextIndex++;
                        }
                        // Append digits left of the decimal delimiter(s)
                        StringBuilder floatStringBuilder = new StringBuilder(); 
                        while ((nextIndex < styleString.Length) && (char.IsDigit(styleString[nextIndex]))) {
                            floatStringBuilder.Append(styleString[nextIndex]); 
                            nextIndex++; 
                        }
                        // Append culture invariant delimiter 
                        floatStringBuilder.Append('.');
                        // Append digits right of the decimal delimiter(s)
                        while ((nextIndex < styleString.Length) && (!char.IsLetter(styleString[nextIndex]))) {
                            if (char.IsDigit(styleString[nextIndex])) { 
                                floatStringBuilder.Append(styleString[nextIndex]);
                            } 
                            nextIndex++; 
                        }
                        string floatString = floatStringBuilder.ToString(); 
                        float width;
                        if (!float.TryParse(floatString, NumberStyles.Float, CultureInfo.InvariantCulture.NumberFormat, out width)) {
                            Debug.Fail(string.Format(CultureInfo.CurrentCulture, "Failed to parse float for style: {0}", floatString));
                            width = 0F; 
                        }
 
                        // Add new Column/Row Style 
                        if (columns) {
                            settings.ColumnStyles.Add(new ColumnStyle(type, width)); 
                        }
                        else {
                            settings.RowStyles.Add(new RowStyle(type, width));
                        } 

                        // Go to the next Column/Row Style 
                        currentIndex = nextIndex; 
                    }
                } 
            }
        }

 
    }
 
} 

 



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

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