Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / lengthconverter.cs / 1 / lengthconverter.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // // File: LengthConverter.cs // // Description: Contains the LengthConverter: TypeConverter for the Length class. // // History: // 06/27/2003 : wwilaria - Initial implementation // //--------------------------------------------------------------------------- using System; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Diagnostics; using System.Globalization; using System.Reflection; using System.Windows; using System.Windows.Markup; using System.Security; using MS.Internal; using MS.Utility; namespace System.Windows { ////// LengthConverter - Converter class for converting instances of other types to and from double representing length. /// public class LengthConverter: TypeConverter { //------------------------------------------------------------------- // // Public Methods // //------------------------------------------------------------------- #region Public Methods ////// CanConvertFrom - Returns whether or not this class can convert from a given type. /// ////// bool - True if thie converter can convert from the provided type, false if not. /// /// The ITypeDescriptorContext for this call. /// The Type being queried for support. public override bool CanConvertFrom(ITypeDescriptorContext typeDescriptorContext, Type sourceType) { // We can only handle strings, integral and floating types TypeCode tc = Type.GetTypeCode(sourceType); switch (tc) { case TypeCode.String: case TypeCode.Decimal: case TypeCode.Single: case TypeCode.Double: case TypeCode.Int16: case TypeCode.Int32: case TypeCode.Int64: case TypeCode.UInt16: case TypeCode.UInt32: case TypeCode.UInt64: return true; default: return false; } } ////// CanConvertTo - Returns whether or not this class can convert to a given type. /// ////// bool - True if this converter can convert to the provided type, false if not. /// /// The ITypeDescriptorContext for this call. /// The Type being queried for support. public override bool CanConvertTo(ITypeDescriptorContext typeDescriptorContext, Type destinationType) { // We can convert to an InstanceDescriptor or to a string. if (destinationType == typeof(InstanceDescriptor) || destinationType == typeof(string)) { return true; } else { return false; } } ////// ConvertFrom - Attempt to convert to a length from the given object /// ////// The double representing the size in 1/96th of an inch. /// ////// An ArgumentNullException is thrown if the example object is null. /// ////// An ArgumentException is thrown if the example object is not null and is not a valid type /// which can be converted to a double. /// /// The ITypeDescriptorContext for this call. /// The CultureInfo which is respected when converting. /// The object to convert to a double. public override object ConvertFrom(ITypeDescriptorContext typeDescriptorContext, CultureInfo cultureInfo, object source) { if (source != null) { if (source is string) { return FromString((string)source, cultureInfo); } else { return (double)(Convert.ToDouble(source, cultureInfo)); } } throw GetConvertFromException(source); } ////// ConvertTo - Attempt to convert a double to the given type /// ////// The object which was constructed. /// ////// An ArgumentNullException is thrown if the example object is null. /// ////// An ArgumentException is thrown if the object is not null, /// or if the destinationType isn't one of the valid destination types. /// /// The ITypeDescriptorContext for this call. /// The CultureInfo which is respected when converting. /// The double to convert. /// The type to which to convert the double. ////// Critical: calls InstanceDescriptor ctor which LinkDemands /// PublicOK: can only make an InstanceDescriptor for double, not an arbitrary class /// [SecurityCritical] public override object ConvertTo(ITypeDescriptorContext typeDescriptorContext, CultureInfo cultureInfo, object value, Type destinationType) { if (destinationType == null) { throw new ArgumentNullException("destinationType"); } if ( value != null && value is double ) { double l = (double)value; if (destinationType == typeof(string)) { if(DoubleUtil.IsNaN(l)) return "Auto"; else return Convert.ToString(l, cultureInfo); } else if (destinationType == typeof(InstanceDescriptor)) { ConstructorInfo ci = typeof(double).GetConstructor(new Type[] { typeof(double) }); return new InstanceDescriptor(ci, new object[] { l }); } } throw GetConvertToException(value, destinationType); } #endregion //-------------------------------------------------------------------- // // Internal Methods // //------------------------------------------------------------------- #region Internal Methods // Parse a Length from a string given the CultureInfo. // Formats: //"[value][unit]" // [value] is a double // [unit] is a string specifying the unit, like 'in' or 'px', or nothing (means pixels) // NOTE - This code is called from FontSizeConverter, so changes will affect both. static internal double FromString(string s, CultureInfo cultureInfo) { string valueString = s.Trim(); string goodString = valueString.ToLowerInvariant(); int strLen = goodString.Length; int strLenUnit = 0; double unitFactor = 1.0; //Auto is represented and Double.NaN //properties that do not want Auto and NaN to be in their ligit values, //should disallow NaN in validation callbacks (same goes for negative values) if (goodString == "auto") return Double.NaN; for (int i = 0; i < PixelUnitStrings.Length; i++) { // NOTE: This is NOT a culture specific comparison. // This is by design: we want the same unit string table to work across all cultures. if (goodString.EndsWith(PixelUnitStrings[i], StringComparison.Ordinal)) { strLenUnit = PixelUnitStrings[i].Length; unitFactor = PixelUnitFactors[i]; break; } } // important to substring original non-lowered string // this allows case sensitive ToDouble below handle "NaN" and "Infinity" correctly. // this addresses windows bug 1177408 valueString = valueString.Substring(0, strLen - strLenUnit); // FormatException errors thrown by Convert.ToDouble are pretty uninformative. // Throw a more meaningful error in this case that tells that we were attempting // to create a Length instance from a string. This addresses windows bug 968884 try { double result = Convert.ToDouble(valueString, cultureInfo) * unitFactor; return result; } catch (FormatException) { throw new FormatException(SR.Get(SRID.LengthFormatError, valueString)); } } // This array contains strings for unit types // These are effectively "TypeConverter only" units. // They are all expressable in terms of the Pixel unit type and a conversion factor. static private string[] PixelUnitStrings = { "px", "in", "cm", "pt" }; static private double[] PixelUnitFactors = { 1.0, // Pixel itself 96.0, // Pixels per Inch 96.0 / 2.54, // Pixels per Centimeter 96.0 / 72.0, // Pixels per Point }; static internal string ToString(double l, CultureInfo cultureInfo) { if(DoubleUtil.IsNaN(l)) return "Auto"; return Convert.ToString(l, cultureInfo); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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