Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / ThicknessConverter.cs / 1305600 / ThicknessConverter.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // // File: ThicknessConverter.cs // // Description: Contains the ThicknessConverter: TypeConverter for the Thicknessclass. // // History: // 07/09/2003 : greglett - Added to WCP branch (was contained in BoxUnitThickness.cs in old Avalon) // //--------------------------------------------------------------------------- using System; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Globalization; using System.Reflection; using System.Text; using System.Windows; using System.Security; using MS.Internal; using MS.Utility; #pragma warning disable 1634, 1691 // suppressing PreSharp warnings namespace System.Windows { ////// ThicknessConverter - Converter class for converting instances of other types to and from Thickness instances. /// public class ThicknessConverter : TypeConverter { #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 Thickness from the given object /// ////// The Thickness which was constructed. /// ////// 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 Thickness. /// /// The ITypeDescriptorContext for this call. /// The CultureInfo which is respected when converting. /// The object to convert to a Thickness. public override object ConvertFrom(ITypeDescriptorContext typeDescriptorContext, CultureInfo cultureInfo, object source) { if (source != null) { if (source is string) { return FromString((string)source, cultureInfo); } else if (source is double) { return new Thickness((double)source); } else { return new Thickness(Convert.ToDouble(source, cultureInfo)); } } throw GetConvertFromException(source); } ////// ConvertTo - Attempt to convert a Thickness to the given type /// ////// The object which was constructoed. /// ////// An ArgumentNullException is thrown if the example object is null. /// ////// An ArgumentException is thrown if the object is not null and is not a Thickness, /// 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 Thickness to convert. /// The type to which to convert the Thickness instance. ////// Critical: calls InstanceDescriptor ctor which LinkDemands /// PublicOK: can only make an InstanceDescriptor for Thickness, not an arbitrary class /// [SecurityCritical] public override object ConvertTo(ITypeDescriptorContext typeDescriptorContext, CultureInfo cultureInfo, object value, Type destinationType) { if (null == value) { throw new ArgumentNullException("value"); } if (null == destinationType) { throw new ArgumentNullException("destinationType"); } if (!(value is Thickness)) { #pragma warning suppress 6506 // value is obviously not null throw new ArgumentException(SR.Get(SRID.UnexpectedParameterType, value.GetType(), typeof(Thickness)), "value"); } Thickness th = (Thickness)value; if (destinationType == typeof(string)) { return ToString(th, cultureInfo); } if (destinationType == typeof(InstanceDescriptor)) { ConstructorInfo ci = typeof(Thickness).GetConstructor(new Type[] { typeof(double), typeof(double), typeof(double), typeof(double) }); return new InstanceDescriptor(ci, new object[] { th.Left, th.Top, th.Right, th.Bottom }); } throw new ArgumentException(SR.Get(SRID.CannotConvertType, typeof(Thickness), destinationType.FullName)); } #endregion Public Methods //------------------------------------------------------------------- // // Internal Methods // //------------------------------------------------------------------- #region Internal Methods static internal string ToString(Thickness th, CultureInfo cultureInfo) { char listSeparator = TokenizerHelper.GetNumericListSeparator(cultureInfo); // Initial capacity [64] is an estimate based on a sum of: // 48 = 4x double (twelve digits is generous for the range of values likely) // 8 = 4x Unit Type string (approx two characters) // 4 = 4x separator characters StringBuilder sb = new StringBuilder(64); sb.Append(LengthConverter.ToString(th.Left, cultureInfo)); sb.Append(listSeparator); sb.Append(LengthConverter.ToString(th.Top, cultureInfo)); sb.Append(listSeparator); sb.Append(LengthConverter.ToString(th.Right, cultureInfo)); sb.Append(listSeparator); sb.Append(LengthConverter.ToString(th.Bottom, cultureInfo)); return sb.ToString(); } static internal Thickness FromString(string s, CultureInfo cultureInfo) { TokenizerHelper th = new TokenizerHelper(s, cultureInfo); double[] lengths = new double[4]; int i = 0; // Peel off each double in the delimited list. while (th.NextToken()) { if (i >= 4) { i = 5; // Set i to a bad value. break; } lengths[i] = LengthConverter.FromString(th.GetCurrentToken(), cultureInfo); i++; } // We have a reasonable interpreation for one value (all four edges), two values (horizontal, vertical), // and four values (left, top, right, bottom). switch (i) { case 1: return new Thickness(lengths[0]); case 2: return new Thickness(lengths[0], lengths[1], lengths[0], lengths[1]); case 4: return new Thickness(lengths[0], lengths[1], lengths[2], lengths[3]); } throw new FormatException(SR.Get(SRID.InvalidStringThickness, s)); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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