Code:
/ DotNET / DotNET / 8.0 / 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); } ////// /// public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { if (destinationType == typeof(InstanceDescriptor) || destinationType == typeof(string)) { return true; } return base.CanConvertTo(context, destinationType); } ///Gets a value indicating whether this converter can /// convert an object to the given destination type using the context. ////// /// 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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