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//---------------------------------------------------------------------------
//
// File: KeyConverter.cs
//
// Description:
//
// KeyConverter : Converts a key string to the *Type* that the string represents and vice-versa
//
// Features:
//
// History:
// 05/28/2003 created: Chandrasekhar Rentachintala
//
// Copyright (C) 2003 by Microsoft Corporation. All rights reserved.
//
//---------------------------------------------------------------------------
using System;
using System.ComponentModel; // for TypeConverter
using System.Globalization; // for CultureInfo
using System.Reflection;
using System.Windows;
using System.Windows.Input;
using System.Windows.Markup;
using System.Security.Permissions;
using MS.Utility;
using MS.Internal.WindowsBase;
namespace System.Windows.Input
{
/// <summary>
/// Key Converter class for converting between a string and the Type of a Key
/// </summary>
/// <ExternalAPI/>
public class KeyConverter : TypeConverter
{
/// <summary>
/// CanConvertFrom()
/// </summary>
/// <param name="context"></param>
/// <param name="sourceType"></param>
/// <returns></returns>
/// <ExternalAPI/>
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
{
if (sourceType == typeof(string))
{
return true;
}
else
{
return false;
}
}
/// <summary>
/// TypeConverter method override.
/// </summary>
/// <param name="context">ITypeDescriptorContext</param>
/// <param name="destinationType">Type to convert to</param>
/// <returns>true if conversion is possible</returns>
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
{
// We can convert to a string.
// We can convert to an InstanceDescriptor or to a string.
if (destinationType == typeof(string))
{
// When invoked by the serialization engine we can convert to string only for known type
if (context != null && context.Instance != null)
{
Key key = (Key)context.Instance;
return ((int)key >= (int)Key.None && (int)key <= (int)Key.DeadCharProcessed);
}
}
return false;
}
/// <summary>
/// ConvertFrom()
/// </summary>
/// <param name="context"></param>
/// <param name="culture"></param>
/// <param name="source"></param>
/// <returns></returns>
/// <ExternalAPI/>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object source)
{
if (source is string)
{
string fullName = ((string)source).Trim();
object key = GetKey(fullName, CultureInfo.InvariantCulture);
if (key != null)
{
return ((Key)key);
}
else
{
throw new NotSupportedException(SR.Get(SRID.Unsupported_Key, fullName));
}
}
throw GetConvertFromException(source);
}
/// <summary>
/// ConvertTo()
/// </summary>
/// <param name="context"></param>
/// <param name="culture"></param>
/// <param name="value"></param>
/// <param name="destinationType"></param>
/// <returns></returns>
/// <ExternalAPI/>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (destinationType == null)
throw new ArgumentNullException("destinationType");
if (destinationType == typeof(string) && value != null)
{
Key key = (Key)value;
if (key == Key.None)
{
return String.Empty;
}
if (key >= Key.D0 && key <= Key.D9)
{
return Char.ToString((char)(int)(key - Key.D0 + '0'));
}
if (key >= Key.A && key <= Key.Z)
{
return Char.ToString((char)(int)(key - Key.A + 'A'));
}
String strKey = MatchKey(key, culture);
if (strKey != null && (strKey.Length != 0 || strKey == String.Empty))
{
return strKey;
}
}
throw GetConvertToException(value, destinationType);
}
private object GetKey(string keyToken, CultureInfo culture)
{
if (keyToken == String.Empty)
{
return Key.None;
}
else
{
keyToken = keyToken.ToUpper(culture);
if (keyToken.Length == 1 && Char.IsLetterOrDigit(keyToken[0]))
{
if (Char.IsDigit(keyToken[0]) && (keyToken[0] >= '0' && keyToken[0] <= '9'))
{
return ((int)(Key)(Key.D0 + keyToken[0] - '0'));
}
else if (Char.IsLetter(keyToken[0]) && (keyToken[0] >= 'A' && keyToken[0] <= 'Z'))
{
return ((int)(Key)(Key.A + keyToken[0] - 'A'));
}
else
{
throw new ArgumentException(SR.Get(SRID.CannotConvertStringToType, keyToken, typeof(Key)));
}
}
else
{
Key keyFound = (Key)(-1);
switch (keyToken)
{
case "ENTER": keyFound = Key.Return; break;
case "ESC": keyFound = Key.Escape; break;
case "PGUP": keyFound = Key.PageUp; break;
case "PGDN": keyFound = Key.PageDown; break;
case "PRTSC": keyFound = Key.PrintScreen; break;
case "INS": keyFound = Key.Insert; break;
case "DEL": keyFound = Key.Delete; break;
case "WINDOWS": keyFound = Key.LWin; break;
case "WIN": keyFound = Key.LWin; break;
case "LEFTWINDOWS": keyFound = Key.LWin; break;
case "RIGHTWINDOWS": keyFound = Key.RWin; break;
case "APPS": keyFound = Key.Apps; break;
case "APPLICATION": keyFound = Key.Apps; break;
case "BREAK": keyFound = Key.Cancel; break;
case "BACKSPACE": keyFound = Key.Back; break;
case "BKSP": keyFound = Key.Back; break;
case "BS": keyFound = Key.Back; break;
case "SHIFT": keyFound = Key.LeftShift; break;
case "LEFTSHIFT": keyFound = Key.LeftShift; break;
case "RIGHTSHIFT": keyFound = Key.RightShift; break;
case "CONTROL": keyFound = Key.LeftCtrl; break;
case "CTRL": keyFound = Key.LeftCtrl; break;
case "LEFTCTRL": keyFound = Key.LeftCtrl; break;
case "RIGHTCTRL": keyFound = Key.RightCtrl; break;
case "ALT": keyFound = Key.LeftAlt; break;
case "LEFTALT": keyFound = Key.LeftAlt; break;
case "RIGHTALT": keyFound = Key.RightAlt; break;
case "SEMICOLON": keyFound = Key.OemSemicolon; break;
case "PLUS": keyFound = Key.OemPlus; break;
case "COMMA": keyFound = Key.OemComma; break;
case "MINUS": keyFound = Key.OemMinus; break;
case "PERIOD": keyFound = Key.OemPeriod; break;
case "QUESTION": keyFound = Key.OemQuestion; break;
case "TILDE": keyFound = Key.OemTilde; break;
case "OPENBRACKETS": keyFound = Key.OemOpenBrackets; break;
case "PIPE": keyFound = Key.OemPipe; break;
case "CLOSEBRACKETS": keyFound = Key.OemCloseBrackets; break;
case "QUOTES": keyFound = Key.OemQuotes; break;
case "BACKSLASH": keyFound = Key.OemBackslash; break;
case "FINISH": keyFound = Key.OemFinish; break;
case "ATTN": keyFound = Key.Attn; break;
case "CRSEL": keyFound = Key.CrSel; break;
case "EXSEL": keyFound = Key.ExSel; break;
case "ERASEEOF": keyFound = Key.EraseEof; break;
case "PLAY": keyFound = Key.Play; break;
case "ZOOM": keyFound = Key.Zoom; break;
case "PA1": keyFound = Key.Pa1; break;
default: keyFound = (Key)Enum.Parse(typeof(Key), keyToken, true); break;
}
if ((int)keyFound != -1)
{
return keyFound;
}
return null;
}
}
}
private static string MatchKey(Key key, CultureInfo culture)
{
if (key == Key.None)
return String.Empty;
else
{
switch (key)
{
case Key.Back: return "Backspace";
case Key.LineFeed: return "Clear";
case Key.Escape: return "Esc";
}
}
if ((int)key >= (int)Key.None && (int)key <= (int)Key.DeadCharProcessed)
return key.ToString();
else
return null;
}
}
}
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