Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Markup / XamlGridLengthSerializer.cs / 1 / XamlGridLengthSerializer.cs
//---------------------------------------------------------------------------- // // File: XamlGridLengthSerializer.cs // // Description: // XamlSerializer used to persist GridLength structures in Baml // // Copyright (C) 2004 by Microsoft Corporation. All rights reserved. // //--------------------------------------------------------------------------- using System; using System.Collections; using System.ComponentModel; using System.ComponentModel.Design; using System.ComponentModel.Design.Serialization; using System.Diagnostics; using System.Globalization; using System.IO; using System.Xml; using System.Windows; using MS.Utility; using MS.Internal; #if PBTCOMPILER namespace MS.Internal.Markup #else namespace System.Windows.Markup #endif { ////// XamlGridLengthSerializer is used to persist a GridLength structure in Baml files /// internal class XamlGridLengthSerializer : XamlSerializer { #region Construction ////// Constructor for XamlGridLengthSerializer /// ////// This constructor will be used under /// the following two scenarios /// 1. Convert a string to a custom binary representation stored in BAML /// 2. Convert a custom binary representation back into a GridLength /// private XamlGridLengthSerializer() { } #endregion Construction #region Conversions ////// Serializes this object using the passed writer. /// ////// This is called ONLY from the Parser and is not a general public method. /// // // Format of serialized data: // first byte other bytes format // 0AAAAAAA none Amount [0 - 127] in AAAAAAA, Pixel GridUnitType // 100XXUUU one byte Amount in byte [0 - 255], GridUnitType in UUU // 110XXUUU two bytes Amount in int16 , GridUnitType in UUU // 101XXUUU four bytes Amount in int32 , GridUnitType in UUU // 111XXUUU eight bytes Amount in double, GridUnitType in UUU // public override bool ConvertStringToCustomBinary ( BinaryWriter writer, // Writer into the baml stream string stringValue) // String to convert { if (writer == null) { throw new ArgumentNullException( "writer" ); } GridUnitType gridUnitType; double value; FromString(stringValue, XamlReaderHelper.EnglishUSCulture, out value, out gridUnitType); byte unitAndFlags = (byte)gridUnitType; int intAmount = (int)value; if ((double)intAmount == value) { // // 0 - 127 and Pixel // if ( intAmount <= 127 && intAmount >= 0 && gridUnitType == GridUnitType.Pixel ) { writer.Write((byte)intAmount); } // // unsigned byte // else if ( intAmount <= 255 && intAmount >= 0 ) { writer.Write((byte)(0x80 | unitAndFlags)); writer.Write((byte)intAmount); } // // signed short integer // else if ( intAmount <= 32767 && intAmount >= -32768 ) { writer.Write((byte)(0xC0 | unitAndFlags)); writer.Write((Int16)intAmount); } // // signed integer // else { writer.Write((byte)(0xA0 | unitAndFlags)); writer.Write(intAmount); } } // // double // else { writer.Write((byte)(0xE0 | unitAndFlags)); writer.Write(value); } return true; } ////// Convert a compact binary representation of a GridLength into and instance /// of GridLength. The reader must be left pointing immediately after the object /// data in the underlying stream. /// ////// This is called ONLY from the Parser and is not a general public method. /// public override object ConvertCustomBinaryToObject( BinaryReader reader) { if (reader == null) { throw new ArgumentNullException( "reader" ); } GridUnitType unitType; double unitValue; byte unitAndFlags = reader.ReadByte(); if ((unitAndFlags & 0x80) == 0) { unitType = GridUnitType.Pixel; unitValue = (double)unitAndFlags; } else { unitType = (GridUnitType)(unitAndFlags & 0x1F); byte flags = (byte)(unitAndFlags & 0xE0); if (flags == 0x80) { unitValue = (double)reader.ReadByte(); } else if (flags == 0xC0) { unitValue = (double)reader.ReadInt16(); } else if (flags == 0xA0) { unitValue = (double)reader.ReadInt32(); } else { unitValue = (double)reader.ReadDouble(); } } return new GridLength(unitValue, unitType); } // Parse a GridLength from a string given the CultureInfo. static internal void FromString( string s, CultureInfo cultureInfo, out double value, out GridUnitType unit) { string goodString = s.Trim().ToLowerInvariant(); value = 0.0; unit = GridUnitType.Pixel; int i; int strLen = goodString.Length; int strLenUnit = 0; double unitFactor = 1.0; // this is where we would handle trailing whitespace on the input string. // peel [unit] off the end of the string i = 0; if (goodString == UnitStrings[i]) { strLenUnit = UnitStrings[i].Length; unit = (GridUnitType)i; } else { for (i = 1; i < UnitStrings.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(UnitStrings[i], StringComparison.Ordinal)) { strLenUnit = UnitStrings[i].Length; unit = (GridUnitType)i; break; } } } // we couldn't match a real unit from GridUnitTypes. // try again with a converter-only unit (a pixel equivalent). if (i >= UnitStrings.Length) { for (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; } } } // this is where we would handle leading whitespace on the input string. // this is also where we would handle whitespace between [value] and [unit]. // check if we don't have a [value]. This is acceptable for certain UnitTypes. if ( strLen == strLenUnit && ( unit == GridUnitType.Auto || unit == GridUnitType.Star ) ) { value = 1; } // we have a value to parse. else { Debug.Assert( unit == GridUnitType.Pixel || DoubleUtil.AreClose(unitFactor, 1.0) ); string valueString = goodString.Substring(0, strLen - strLenUnit); value = Convert.ToDouble(valueString, cultureInfo) * unitFactor; } } #endregion Conversions #region Fields // Note: keep this array in sync with the GridUnitType enum static private string[] UnitStrings = { "auto", "px", "*" }; // this array contains strings for unit types that are not present in the GridUnitType enum static private string[] PixelUnitStrings = { "in", "cm", "pt" }; static private double[] PixelUnitFactors = { 96.0, // Pixels per Inch 96.0 / 2.54, // Pixels per Centimeter 96.0 / 72.0, // Pixels per Point }; #endregion Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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