Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / KeysConverter.cs / 1 / KeysConverter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.Windows.Forms { using System.Text; using Microsoft.Win32; using System.Collections; using System.Collections.Generic; using System.Collections.Specialized; using System.ComponentModel; using System.Drawing; using System.Diagnostics; using System.Globalization; using System.Reflection; using System.Diagnostics.CodeAnalysis; ////// /// public class KeysConverter : TypeConverter, IComparer { private IDictionary keyNames; private ListProvides a type converter to convert ///objects to and from various /// other representations. displayOrder; private StandardValuesCollection values; private const Keys FirstDigit = System.Windows.Forms.Keys.D0; private const Keys LastDigit = System.Windows.Forms.Keys.D9; private const Keys FirstAscii = System.Windows.Forms.Keys.A; private const Keys LastAscii = System.Windows.Forms.Keys.Z; private const Keys FirstNumpadDigit = System.Windows.Forms.Keys.NumPad0; private const Keys LastNumpadDigit = System.Windows.Forms.Keys.NumPad9; private void AddKey(string key, Keys value ) { keyNames[key] = value; displayOrder.Add(key); } private void Initialize() { keyNames = new Hashtable(34); displayOrder = new List (34); AddKey(SR.GetString(SR.toStringEnter), Keys.Return); AddKey("F12", Keys.F12); AddKey("F11", Keys.F11); AddKey("F10", Keys.F10); AddKey(SR.GetString(SR.toStringEnd), Keys.End); AddKey(SR.GetString(SR.toStringControl), Keys.Control); AddKey("F8", Keys.F8); AddKey("F9", Keys.F9); AddKey(SR.GetString(SR.toStringAlt), Keys.Alt); AddKey("F4", Keys.F4); AddKey("F5", Keys.F5); AddKey("F6", Keys.F6); AddKey("F7", Keys.F7); AddKey("F1", Keys.F1); AddKey("F2", Keys.F2); AddKey("F3", Keys.F3); AddKey(SR.GetString(SR.toStringPageDown), Keys.Next); AddKey(SR.GetString(SR.toStringInsert), Keys.Insert); AddKey(SR.GetString(SR.toStringHome), Keys.Home); AddKey(SR.GetString(SR.toStringDelete), Keys.Delete); AddKey(SR.GetString(SR.toStringShift), Keys.Shift); AddKey(SR.GetString(SR.toStringPageUp), Keys.Prior); AddKey(SR.GetString(SR.toStringBack), Keys.Back); //new whidbey keys follow here... // VSWhidbey 95006: Add string mappings for these values (numbers 0-9) so that the keyboard shortcuts // will be displayed properly in menus. AddKey("0", Keys.D0); AddKey("1", Keys.D1); AddKey("2", Keys.D2); AddKey("3", Keys.D3); AddKey("4", Keys.D4); AddKey("5", Keys.D5); AddKey("6", Keys.D6); AddKey("7", Keys.D7); AddKey("8", Keys.D8); AddKey("9", Keys.D9); } /// /// /// Access to a lookup table of name/value pairs for keys. These are localized /// names. /// private IDictionary KeyNames { get { if (keyNames == null) { Debug.Assert(displayOrder == null); Initialize(); } return keyNames; } } private ListDisplayOrder { get { if (displayOrder == null) { Debug.Assert(keyNames == null); Initialize(); } return displayOrder; } } /// /// /// /// Determines if this converter can convert an object in the given source /// type to the native type of the converter. /// public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { if (sourceType == typeof(string) || sourceType == typeof(Enum[])) { return true; } return base.CanConvertFrom(context, sourceType); } ////// /// public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { if (destinationType == typeof(Enum[])) { return true; } return base.CanConvertTo(context, destinationType); } ///Gets a value indicating whether this converter can /// convert an object to the given destination type using the context. ////// /// public int Compare(object a, object b) { return String.Compare(ConvertToString(a), ConvertToString(b), false, CultureInfo.InvariantCulture); } ///Compares two key values for equivalence. ////// /// /// Converts the given object to the converter's native type. /// public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { if (value is string) { string text = ((string)value).Trim(); if (text.Length == 0) { return null; } else { // Parse an array of key tokens. // string[] tokens = text.Split(new char[] {'+'}); for (int i = 0; i < tokens.Length; i++) { tokens[i] = tokens[i].Trim(); } // Now lookup each key token in our key hashtable. // Keys key = (Keys)0; bool foundKeyCode = false; for (int i = 0; i < tokens.Length; i++) { object obj = KeyNames[tokens[i]]; if (obj == null) { // Key was not found in our table. See if it is a valid value in // the Keys enum. // obj = Enum.Parse(typeof(Keys), tokens[i]); } if (obj != null) { Keys currentKey = (Keys)obj; if ((currentKey & Keys.KeyCode) != 0) { // We found a match. If we have previously found a // key code, then check to see that this guy // isn't a key code (it is illegal to have, say, // "A + B" // if (foundKeyCode) { throw new FormatException(SR.GetString(SR.KeysConverterInvalidKeyCombination)); } foundKeyCode = true; } // Now OR the key into our current key // key |= currentKey; } else { // We did not match this key. Report this as an error too. // throw new FormatException(SR.GetString(SR.KeysConverterInvalidKeyName, tokens[i])); } } return (object)key; } } else if (value is Enum[]) { long finalValue = 0; foreach(Enum e in (Enum[])value) { finalValue |= Convert.ToInt64(e, CultureInfo.InvariantCulture); } return Enum.ToObject(typeof(Keys), finalValue); } return base.ConvertFrom(context, culture, value); } ////// /// /// Converts the given object to another type. The most common types to convert /// are to and from a string object. The default implementation will make a call /// to ToString on the object if the object is valid and if the destination /// type is string. If this cannot convert to the desitnation type, this will /// throw a NotSupportedException. /// [SuppressMessage("Microsoft.Performance", "CA1803:AvoidCostlyCallsWherePossible")] public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { if (destinationType == null) { throw new ArgumentNullException("destinationType"); } if (value is Keys || value is int) { bool asString = destinationType == typeof(string); bool asEnum = false; if (!asString) asEnum = destinationType == typeof(Enum[]); if (asString || asEnum) { Keys key = (Keys)value; bool added = false; ArrayList terms = new ArrayList(); Keys modifiers = (key & Keys.Modifiers); // First, iterate through and do the modifiers. These are // additive, so we support things like Ctrl + Alt // for (int i = 0; i < DisplayOrder.Count; i++) { string keyString = (string)DisplayOrder[i]; Keys keyValue = (Keys)keyNames[keyString]; if (((int)(keyValue) & (int)modifiers) != 0) { if (asString) { if (added) { terms.Add("+"); } terms.Add((string)keyString); } else { terms.Add(keyValue); } added = true; } } // Now reset and do the key values. Here, we quit if // we find a match. // Keys keyOnly = (key & Keys.KeyCode); bool foundKey = false; if (added && asString) { terms.Add("+"); } for (int i = 0; i < DisplayOrder.Count; i++) { string keyString = (string)DisplayOrder[i]; Keys keyValue = (Keys)keyNames[keyString]; if (keyValue.Equals(keyOnly)) { if (asString) { terms.Add((string)keyString); } else { terms.Add(keyValue); } added = true; foundKey = true; break; } } // Finally, if the key wasn't in our list, add it to // the end anyway. Here we just pull the key value out // of the enum. // if (!foundKey && Enum.IsDefined(typeof(Keys), (int)keyOnly)) { if (asString) { terms.Add(((Enum)keyOnly).ToString()); } else { terms.Add((Enum)keyOnly); } } if (asString) { StringBuilder b = new StringBuilder(32); foreach(string t in terms) { b.Append(t); } return b.ToString(); } else { return (Enum[])terms.ToArray(typeof(Enum)); } } } return base.ConvertTo(context, culture, value, destinationType); } ////// /// /// Retrieves a collection containing a set of standard values /// for the data type this validator is designed for. This /// will return null if the data type does not support a /// standard set of values. /// public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) { if (values == null) { ArrayList list = new ArrayList(); ICollection keys = KeyNames.Values; foreach (object o in keys) { list.Add(o); } list.Sort(this); values = new StandardValuesCollection(list.ToArray()); } return values; } ////// /// /// Determines if the list of standard values returned from /// GetStandardValues is an exclusive list. If the list /// is exclusive, then no other values are valid, such as /// in an enum data type. If the list is not exclusive, /// then there are other valid values besides the list of /// standard values GetStandardValues provides. /// public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) { return false; } ////// /// /// Determines if this object supports a standard set of values /// that can be picked from a list. /// public override bool GetStandardValuesSupported(ITypeDescriptorContext context) { return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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