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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Input / Command / KeyGestureConverter.cs / 1305600 / KeyGestureConverter.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: KeyGestureConverter - Converts a KeyGesture string // to the *Type* that the string represents // // // History: // 05/01/2004 : Chandrasekhar Rentachintala - Created // //--------------------------------------------------------------------------- using System; using System.ComponentModel; // for TypeConverter using System.Globalization; // for CultureInfo using System.Reflection; using MS.Internal; using System.Windows; using System.Windows.Input; using MS.Utility; namespace System.Windows.Input { ////// KeyGesture - Converter class for converting between a string and the Type of a KeyGesture /// public class KeyGestureConverter : TypeConverter { private const char MODIFIERS_DELIMITER = '+' ; internal const char DISPLAYSTRING_SEPARATOR = ',' ; //////CanConvertFrom() /// ///ITypeDescriptorContext ///type to convert from ///true if the given type can be converted, false otherwise public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { // We can only handle string. if (sourceType == typeof(string)) { return true; } else { return false; } } //////TypeConverter method override. /// ///ITypeDescriptorContext ///Type to convert to ///true if conversion is possible public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { // 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) { KeyGesture keyGesture = context.Instance as KeyGesture; if (keyGesture != null) { return (ModifierKeysConverter.IsDefinedModifierKeys(keyGesture.Modifiers) && IsDefinedKey(keyGesture.Key)); } } } return false; } ////// ConvertFrom() /// /// /// /// ///public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object source) { if (source != null && source is string) { string fullName = ((string)source).Trim(); if (fullName == String.Empty) return new KeyGesture(Key.None); string keyToken; string modifiersToken; string displayString; // break apart display string int index = fullName.IndexOf(DISPLAYSTRING_SEPARATOR); if (index >= 0) { displayString = fullName.Substring(index + 1).Trim(); fullName = fullName.Substring(0, index).Trim(); } else { displayString = String.Empty; } // break apart key and modifiers index = fullName.LastIndexOf(MODIFIERS_DELIMITER); if (index >= 0) { // modifiers exists modifiersToken = fullName.Substring(0, index); keyToken = fullName.Substring(index + 1); } else { modifiersToken = String.Empty; keyToken = fullName; } ModifierKeys modifiers = ModifierKeys.None; object resultkey = keyConverter.ConvertFrom(context, culture, keyToken); if (resultkey != null) { object temp = modifierKeysConverter.ConvertFrom(context, culture, modifiersToken); if (temp != null) { modifiers = (ModifierKeys)temp; } return new KeyGesture((Key)resultkey, modifiers, displayString); } } throw GetConvertFromException(source); } /// /// ConvertTo() /// /// /// /// /// ///public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { if (destinationType == null) throw new ArgumentNullException("destinationType"); if (destinationType == typeof(string)) { if (value != null) { KeyGesture keyGesture = value as KeyGesture; if (keyGesture != null) { if (keyGesture.Key == Key.None) return String.Empty; string strBinding = "" ; string strKey = (string)keyConverter.ConvertTo(context, culture, keyGesture.Key, destinationType) as string; if (strKey != String.Empty) { strBinding += modifierKeysConverter.ConvertTo(context, culture, keyGesture.Modifiers, destinationType) as string; if (strBinding != String.Empty) { strBinding += MODIFIERS_DELIMITER; } strBinding += strKey; if (!String.IsNullOrEmpty(keyGesture.DisplayString)) { strBinding += DISPLAYSTRING_SEPARATOR + keyGesture.DisplayString; } } return strBinding; } } else { return String.Empty; } } throw GetConvertToException(value,destinationType); } // Check for Valid enum, as any int can be casted to the enum. internal static bool IsDefinedKey(Key key) { return (key >= Key.None && key <= Key.OemClear); } private static KeyConverter keyConverter = new KeyConverter(); private static ModifierKeysConverter modifierKeysConverter = new ModifierKeysConverter(); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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