Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / GridLengthConverter.cs / 1 / GridLengthConverter.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: Grid length converter implementation // // See spec at [....]/layout/Specs/Star%20LengthUnit.mht // // History: // 09/24/2003 : [....] - Created (in griddy prototype branch); // 10/27/2003 : [....] - Ported from griddy prototype branch; // //--------------------------------------------------------------------------- using MS.Internal; using MS.Utility; using System.ComponentModel; using System.Windows; using System; using System.Security; using System.ComponentModel.Design.Serialization; using System.Diagnostics; using System.Globalization; using System.Reflection; using System.Windows.Markup; namespace System.Windows { ////// GridLengthConverter - Converter class for converting /// instances of other types to and from GridLength instances. /// public class GridLengthConverter: TypeConverter { //------------------------------------------------------------------- // // Public Methods // //------------------------------------------------------------------- #region Public Methods ////// Checks whether or not this class can convert from a given type. /// /// 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; } } ///true if thie converter can convert from the provided type, ///false otherwise. ////// Checks whether or not this class can convert to a given type. /// /// The ITypeDescriptorContext /// for this call. /// The Type being queried for support. ////// public override bool CanConvertTo( ITypeDescriptorContext typeDescriptorContext, Type destinationType) { return ( destinationType == typeof(InstanceDescriptor) || destinationType == typeof(string) ); } ///true if this converter can convert to the provided type, ///false otherwise. ////// Attempts to convert to a GridLength from the given object. /// /// The ITypeDescriptorContext for this call. /// The CultureInfo which is respected when converting. /// The object to convert to a GridLength. ////// The GridLength instance 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 GridLength. /// public override object ConvertFrom( ITypeDescriptorContext typeDescriptorContext, CultureInfo cultureInfo, object source) { if (source != null) { if (source is string) { return (FromString((string)source, cultureInfo)); } else { // conversion from numeric type double value; GridUnitType type; value = Convert.ToDouble(source, cultureInfo); if (DoubleUtil.IsNaN(value)) { // this allows for conversion from Width / Height = "Auto" value = 1.0; type = GridUnitType.Auto; } else { type = GridUnitType.Pixel; } return new GridLength(value, type); } } throw GetConvertFromException(source); } ////// Attempts to convert a GridLength instance to the given type. /// /// The ITypeDescriptorContext for this call. /// The CultureInfo which is respected when converting. /// The GridLength to convert. /// The type to which to convert the GridLength instance. ////// 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 and is not a GridLength, /// or if the destinationType isn't one of the valid destination types. /// ////// Critical: calls InstanceDescriptor ctor which LinkDemands /// PublicOK: can only make an InstanceDescriptor for GridLength, 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 GridLength ) { GridLength gl = (GridLength)value; if (destinationType == typeof(string)) { return (ToString(gl, cultureInfo)); } if (destinationType == typeof(InstanceDescriptor)) { ConstructorInfo ci = typeof(GridLength).GetConstructor(new Type[] { typeof(double), typeof(GridUnitType) }); return (new InstanceDescriptor(ci, new object[] { gl.Value, gl.GridUnitType })); } } throw GetConvertToException(value, destinationType); } #endregion Public Methods //-------------------------------------------------------------------- // // Internal Methods // //------------------------------------------------------------------- #region Internal Methods ////// Converts a GridLength instance to a String given the CultureInfo. /// /// GridLength instance to convert. /// Culture Info. ///String representation of the object. static internal string ToString(GridLength gl, CultureInfo cultureInfo) { switch (gl.GridUnitType) { // for Auto print out "Auto". value is always "1.0" case (GridUnitType.Auto): return ("Auto"); // Star has one special case when value is "1.0". // in this case drop value part and print only "Star" case (GridUnitType.Star): return ( DoubleUtil.IsOne(gl.Value) ? "*" : Convert.ToString(gl.Value, cultureInfo) + "*"); // for Pixel print out the numeric value. "px" can be omitted. default: return (Convert.ToString(gl.Value, cultureInfo)); } } ////// Parses a GridLength from a string given the CultureInfo. /// /// String to parse from. /// Culture Info. ///Newly created GridLength instance. ////// Formats: /// "[value][unit]" /// [value] is a double /// [unit] is a string in GridLength._unitTypes connected to a GridUnitType /// "[value]" /// As above, but the GridUnitType is assumed to be GridUnitType.Pixel /// "[unit]" /// As above, but the value is assumed to be 1.0 /// This is only acceptable for a subset of GridUnitType: Auto /// static internal GridLength FromString(string s, CultureInfo cultureInfo) { double value; GridUnitType unit; XamlGridLengthSerializer.FromString(s, cultureInfo, out value, out unit); return (new GridLength(value, unit)); } #endregion Internal Methods } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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