Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / TextDecorationCollectionConverter.cs / 1305600 / TextDecorationCollectionConverter.cs
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
//
// Description: TextDecorationCollectionConverter class
//
// History:
// 2/23/2004: Garyyang Created the file
//
//---------------------------------------------------------------------------
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Globalization;
using System.Reflection;
using System.Security;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace System.Windows
{
///
/// TypeConverter for TextDecorationCollection
///
public sealed class TextDecorationCollectionConverter : TypeConverter
{
///
/// CanConvertTo method
///
/// ITypeDescriptorContext
/// Type to convert to
/// false will always be returned because TextDecorations cannot be converted to any other type.
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
{
if (destinationType == typeof(InstanceDescriptor))
{
return true;
}
// return false for any other target type. Don't call base.CanConvertTo() because it would be confusing
// in some cases. For example, for destination typeof(String), base convertor just converts the TDC to the
// string full name of the type.
return false;
}
///
/// CanConvertFrom
///
/// ITypeDescriptorContext
/// Type to convert to
/// true if it can convert from sourceType to TextDecorations, false otherwise
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
{
if (sourceType == typeof(string))
{
return true;
}
return false;
}
///
/// ConvertFrom
///
/// ITypeDescriptorContext
/// CultureInfo
/// The input object to be converted to TextDecorations
/// the converted value of the input object
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object input)
{
if (input == null)
{
throw GetConvertFromException(input);
}
string value = input as string;
if (null == value)
{
throw new ArgumentException(SR.Get(SRID.General_BadType, "ConvertFrom"), "input");
}
return ConvertFromString(value);
}
///
/// ConvertFromString
///
/// The string to be converted into TextDecorationCollection object
/// the converted value of the string flag
///
/// The text parameter can be either string "None" or a combination of the predefined
/// TextDecoration names delimited by commas (,). One or more blanks spaces can precede
/// or follow each text decoration name or comma. There can't be duplicate TextDecoration names in the
/// string. The operation is case-insensitive.
///
public static new TextDecorationCollection ConvertFromString(string text)
{
if (text == null)
{
return null;
}
TextDecorationCollection textDecorations = new TextDecorationCollection();
// Flags indicating which Predefined textDecoration has alrady been added.
byte MatchedTextDecorationFlags = 0;
// Start from the 1st non-whitespace character
// Negative index means error is encountered
int index = AdvanceToNextNonWhiteSpace(text, 0);
while (index >= 0 && index < text.Length)
{
if (Match(None, text, index))
{
// Matched "None" in the input
index = AdvanceToNextNonWhiteSpace(text, index + None.Length);
if (textDecorations.Count > 0 || index < text.Length)
{
// Error: "None" can only be specified by its own
index = -1;
}
}
else
{
// Match the input with one of the predefined text decoration names
int i;
for(i = 0;
i < TextDecorationNames.Length
&& !Match(TextDecorationNames[i], text, index);
i++
);
if (i < TextDecorationNames.Length)
{
// Found a match within the predefined names
if ((MatchedTextDecorationFlags & (1 << i)) > 0)
{
// Error: The matched value is duplicated.
index = -1;
}
else
{
// Valid match. Add to the collection and remember that this text decoration
// has been added
textDecorations.Add(PredefinedTextDecorations[i]);
MatchedTextDecorationFlags |= (byte)(1 << i);
// Advance to the start of next name
index = AdvanceToNextNameStart(text, index + TextDecorationNames[i].Length);
}
}
else
{
// Error: no match found in the predefined names
index = -1;
}
}
}
if (index < 0)
{
throw new ArgumentException(SR.Get(SRID.InvalidTextDecorationCollectionString, text));
}
return textDecorations;
}
///
/// ConvertTo
///
/// ITypeDescriptorContext
/// CultureInfo
/// the object to be converted to another type
/// The destination type of the conversion
/// null will always be returned because TextDecorations cannot be converted to any other type.
///
/// Critical: calls InstanceDescriptor ctor which LinkDemands
/// PublicOK: can only make an InstanceDescriptor for TextDecoration, not an arbitrary class
///
[SecurityCritical]
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (destinationType == typeof(InstanceDescriptor) && value is IEnumerable)
{
ConstructorInfo ci = typeof(TextDecorationCollection).GetConstructor(
new Type[]{typeof(IEnumerable)}
);
return new InstanceDescriptor(ci, new object[]{value});
}
// Pass unhandled cases to base class (which will throw exceptions for null value or destinationType.)
return base.ConvertTo(context, culture, value, destinationType);
}
//---------------------------------
// Private methods
//---------------------------------
///
/// Match the input against a predefined pattern from certain index onwards
///
private static bool Match(string pattern, string input, int index)
{
int i = 0;
for (;
i < pattern.Length
&& index + i < input.Length
&& pattern[i] == Char.ToUpperInvariant(input[index + i]);
i++) ;
return (i == pattern.Length);
}
///
/// Advance to the start of next name
///
private static int AdvanceToNextNameStart(string input, int index)
{
// Two names must be seperated by a comma and optionally spaces
int separator = AdvanceToNextNonWhiteSpace(input, index);
int nextNameStart;
if (separator >= input.Length)
{
// reach the end
nextNameStart = input.Length;
}
else
{
if (input[separator] == Separator)
{
nextNameStart = AdvanceToNextNonWhiteSpace(input, separator + 1);
if (nextNameStart >= input.Length)
{
// Error: Separator is at the end of the input
nextNameStart = -1;
}
}
else
{
// Error: There is a non-whitespace, non-separator character following
// the matched value
nextNameStart = -1;
}
}
return nextNameStart;
}
///
/// Advance to the next non-whitespace character
///
private static int AdvanceToNextNonWhiteSpace(string input, int index)
{
for (; index < input.Length && Char.IsWhiteSpace(input[index]); index++) ;
return (index > input.Length) ? input.Length : index;
}
//---------------------------------
// Private members
//---------------------------------
//
// Predefined valid names for TextDecorations
// Names should be normalized to be upper case
//
private const string None = "NONE";
private const char Separator = ',';
private static readonly string[] TextDecorationNames = new string[] {
"OVERLINE",
"BASELINE",
"UNDERLINE",
"STRIKETHROUGH"
};
// Predefined TextDecorationCollection values. It should match
// the TextDecorationNames array
private static readonly TextDecorationCollection[] PredefinedTextDecorations =
new TextDecorationCollection[] {
TextDecorations.OverLine,
TextDecorations.Baseline,
TextDecorations.Underline,
TextDecorations.Strikethrough
};
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
//
// Description: TextDecorationCollectionConverter class
//
// History:
// 2/23/2004: Garyyang Created the file
//
//---------------------------------------------------------------------------
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Globalization;
using System.Reflection;
using System.Security;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace System.Windows
{
///
/// TypeConverter for TextDecorationCollection
///
public sealed class TextDecorationCollectionConverter : TypeConverter
{
///
/// CanConvertTo method
///
/// ITypeDescriptorContext
/// Type to convert to
/// false will always be returned because TextDecorations cannot be converted to any other type.
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
{
if (destinationType == typeof(InstanceDescriptor))
{
return true;
}
// return false for any other target type. Don't call base.CanConvertTo() because it would be confusing
// in some cases. For example, for destination typeof(String), base convertor just converts the TDC to the
// string full name of the type.
return false;
}
///
/// CanConvertFrom
///
/// ITypeDescriptorContext
/// Type to convert to
/// true if it can convert from sourceType to TextDecorations, false otherwise
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
{
if (sourceType == typeof(string))
{
return true;
}
return false;
}
///
/// ConvertFrom
///
/// ITypeDescriptorContext
/// CultureInfo
/// The input object to be converted to TextDecorations
/// the converted value of the input object
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object input)
{
if (input == null)
{
throw GetConvertFromException(input);
}
string value = input as string;
if (null == value)
{
throw new ArgumentException(SR.Get(SRID.General_BadType, "ConvertFrom"), "input");
}
return ConvertFromString(value);
}
///
/// ConvertFromString
///
/// The string to be converted into TextDecorationCollection object
/// the converted value of the string flag
///
/// The text parameter can be either string "None" or a combination of the predefined
/// TextDecoration names delimited by commas (,). One or more blanks spaces can precede
/// or follow each text decoration name or comma. There can't be duplicate TextDecoration names in the
/// string. The operation is case-insensitive.
///
public static new TextDecorationCollection ConvertFromString(string text)
{
if (text == null)
{
return null;
}
TextDecorationCollection textDecorations = new TextDecorationCollection();
// Flags indicating which Predefined textDecoration has alrady been added.
byte MatchedTextDecorationFlags = 0;
// Start from the 1st non-whitespace character
// Negative index means error is encountered
int index = AdvanceToNextNonWhiteSpace(text, 0);
while (index >= 0 && index < text.Length)
{
if (Match(None, text, index))
{
// Matched "None" in the input
index = AdvanceToNextNonWhiteSpace(text, index + None.Length);
if (textDecorations.Count > 0 || index < text.Length)
{
// Error: "None" can only be specified by its own
index = -1;
}
}
else
{
// Match the input with one of the predefined text decoration names
int i;
for(i = 0;
i < TextDecorationNames.Length
&& !Match(TextDecorationNames[i], text, index);
i++
);
if (i < TextDecorationNames.Length)
{
// Found a match within the predefined names
if ((MatchedTextDecorationFlags & (1 << i)) > 0)
{
// Error: The matched value is duplicated.
index = -1;
}
else
{
// Valid match. Add to the collection and remember that this text decoration
// has been added
textDecorations.Add(PredefinedTextDecorations[i]);
MatchedTextDecorationFlags |= (byte)(1 << i);
// Advance to the start of next name
index = AdvanceToNextNameStart(text, index + TextDecorationNames[i].Length);
}
}
else
{
// Error: no match found in the predefined names
index = -1;
}
}
}
if (index < 0)
{
throw new ArgumentException(SR.Get(SRID.InvalidTextDecorationCollectionString, text));
}
return textDecorations;
}
///
/// ConvertTo
///
/// ITypeDescriptorContext
/// CultureInfo
/// the object to be converted to another type
/// The destination type of the conversion
/// null will always be returned because TextDecorations cannot be converted to any other type.
///
/// Critical: calls InstanceDescriptor ctor which LinkDemands
/// PublicOK: can only make an InstanceDescriptor for TextDecoration, not an arbitrary class
///
[SecurityCritical]
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (destinationType == typeof(InstanceDescriptor) && value is IEnumerable)
{
ConstructorInfo ci = typeof(TextDecorationCollection).GetConstructor(
new Type[]{typeof(IEnumerable)}
);
return new InstanceDescriptor(ci, new object[]{value});
}
// Pass unhandled cases to base class (which will throw exceptions for null value or destinationType.)
return base.ConvertTo(context, culture, value, destinationType);
}
//---------------------------------
// Private methods
//---------------------------------
///
/// Match the input against a predefined pattern from certain index onwards
///
private static bool Match(string pattern, string input, int index)
{
int i = 0;
for (;
i < pattern.Length
&& index + i < input.Length
&& pattern[i] == Char.ToUpperInvariant(input[index + i]);
i++) ;
return (i == pattern.Length);
}
///
/// Advance to the start of next name
///
private static int AdvanceToNextNameStart(string input, int index)
{
// Two names must be seperated by a comma and optionally spaces
int separator = AdvanceToNextNonWhiteSpace(input, index);
int nextNameStart;
if (separator >= input.Length)
{
// reach the end
nextNameStart = input.Length;
}
else
{
if (input[separator] == Separator)
{
nextNameStart = AdvanceToNextNonWhiteSpace(input, separator + 1);
if (nextNameStart >= input.Length)
{
// Error: Separator is at the end of the input
nextNameStart = -1;
}
}
else
{
// Error: There is a non-whitespace, non-separator character following
// the matched value
nextNameStart = -1;
}
}
return nextNameStart;
}
///
/// Advance to the next non-whitespace character
///
private static int AdvanceToNextNonWhiteSpace(string input, int index)
{
for (; index < input.Length && Char.IsWhiteSpace(input[index]); index++) ;
return (index > input.Length) ? input.Length : index;
}
//---------------------------------
// Private members
//---------------------------------
//
// Predefined valid names for TextDecorations
// Names should be normalized to be upper case
//
private const string None = "NONE";
private const char Separator = ',';
private static readonly string[] TextDecorationNames = new string[] {
"OVERLINE",
"BASELINE",
"UNDERLINE",
"STRIKETHROUGH"
};
// Predefined TextDecorationCollection values. It should match
// the TextDecorationNames array
private static readonly TextDecorationCollection[] PredefinedTextDecorations =
new TextDecorationCollection[] {
TextDecorations.OverLine,
TextDecorations.Baseline,
TextDecorations.Underline,
TextDecorations.Strikethrough
};
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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