Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Input / Command / MouseGestureConverter.cs / 1305600 / MouseGestureConverter.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: MouseGestureConverter - Converts a MouseGesture string // to the *Type* that the string represents // // // History: // 05/01/2003 : 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 { ////// MouseGesture - Converter class for converting between a string and the Type of a MouseGesture /// public class MouseGestureConverter : TypeConverter { private const char MODIFIERS_DELIMITER = '+' ; ////// 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; } } ////// ConvertFrom /// /// Parser Context /// Culture Info /// MouseGesture String ///public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object source) { if (source is string && source != null) { string fullName = ((string)source).Trim(); string mouseActionToken; string modifiersToken; if (fullName == String.Empty) return new MouseGesture(MouseAction.None, ModifierKeys.None); ; // break apart LocalName and Prefix int Offset = fullName.LastIndexOf(MODIFIERS_DELIMITER); if (Offset >= 0) { // modifiers exists modifiersToken = fullName.Substring(0,Offset); mouseActionToken = fullName.Substring(Offset + 1); } else { modifiersToken = String.Empty; mouseActionToken = fullName; } TypeConverter mouseActionConverter = TypeDescriptor.GetConverter(typeof(System.Windows.Input.MouseAction)); if (null != mouseActionConverter ) { object mouseAction = mouseActionConverter.ConvertFrom(context, culture, mouseActionToken); // mouseAction Converter will throw Exception, if it fails, // so we don't need to check once more for bogus // MouseAction values if (mouseAction != null) { if (modifiersToken != String.Empty) { TypeConverter modifierKeysConverter = TypeDescriptor.GetConverter(typeof(System.Windows.Input.ModifierKeys)); if (null != modifierKeysConverter) { object modifierKeys = modifierKeysConverter.ConvertFrom(context, culture, modifiersToken); if (modifierKeys != null && modifierKeys is ModifierKeys) { return new MouseGesture((MouseAction)mouseAction, (ModifierKeys)modifierKeys); } } } else { return new MouseGesture((MouseAction)mouseAction); } } } } throw GetConvertFromException(source); } /// ///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) { MouseGesture mouseGesture = context.Instance as MouseGesture; if (mouseGesture != null) { return (ModifierKeysConverter.IsDefinedModifierKeys(mouseGesture.Modifiers) && MouseActionConverter.IsDefinedMouseAction(mouseGesture.MouseAction)); } } } return false; } ////// ConvertTo() /// /// Serialization Context /// Culture Info /// MouseGesture value /// Type to Convert ///string if parameter is a MouseGesture 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) return String.Empty; MouseGesture mouseGesture = value as MouseGesture; if (mouseGesture != null) { string strGesture = ""; TypeConverter modifierKeysConverter = TypeDescriptor.GetConverter(typeof(System.Windows.Input.ModifierKeys)); if (null != modifierKeysConverter) { strGesture += modifierKeysConverter.ConvertTo(context, culture, mouseGesture.Modifiers, destinationType) as string; if (strGesture != String.Empty) { strGesture += MODIFIERS_DELIMITER ; } } TypeConverter mouseActionConverter = TypeDescriptor.GetConverter(typeof(System.Windows.Input.MouseAction)); if (null != mouseActionConverter) { strGesture += mouseActionConverter.ConvertTo(context, culture, mouseGesture.MouseAction, destinationType) as string; } return strGesture; } } throw GetConvertToException(value,destinationType); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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