Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Input / KeyEventArgs.cs / 1 / KeyEventArgs.cs
using System; using System.Security; using MS.Internal; using MS.Internal.PresentationCore; // SecurityHelper namespace System.Windows.Input { ////// The KeyEventArgs class contains information about key states. /// ///public class KeyEventArgs : KeyboardEventArgs { /// /// Constructs an instance of the KeyEventArgs class. /// /// /// The logical keyboard device associated with this event. /// /// /// The input source that provided this input. /// /// /// The time when the input occured. /// /// /// The key referenced by the event. /// ////// Critical - accepts PresentationSource. /// [SecurityCritical] public KeyEventArgs(KeyboardDevice keyboard, PresentationSource inputSource, int timestamp, Key key) : base(keyboard, timestamp) { if (inputSource == null) throw new ArgumentNullException("inputSource"); if (!Keyboard.IsValidKey(key)) throw new System.ComponentModel.InvalidEnumArgumentException("key", (int)key, typeof(Key)); _inputSource = inputSource; _realKey = key; _isRepeat = false; // Start out assuming that this is just a normal key. MarkNormal(); } ////// The input source that provided this input. /// ////// Callers must have UIPermission(PermissionState.Unrestricted) to call this API. /// ////// Critical - hands out _inputSource via UnsafeInputSource call. /// PublicOK - there is a demand. /// public PresentationSource InputSource { [SecurityCritical ] get { SecurityHelper.DemandUnrestrictedUIPermission(); return UnsafeInputSource; } } ////// The Key referenced by the event, if the key is not being /// handled specially. /// public Key Key { get {return _key;} } ////// The original key, as opposed to ///, which might /// have been changed (e.g. by MarkTextInput). /// /// Note: This should remain internal. When a processor obfuscates the key, /// such as changing characters to Key.TextInput, we're deliberately trying to /// hide it and make it hard to find. But internally we'd like an easy way to find /// it. So we have this internal, but it must remain internal. /// internal Key RealKey { get { return _realKey; } } ////// The Key referenced by the event, if the key is going to be /// processed by an IME. /// public Key ImeProcessedKey { get { return (_key == Key.ImeProcessed) ? _realKey : Key.None;} } ////// The Key referenced by the event, if the key is going to be /// processed by an system. /// public Key SystemKey { get { return (_key == Key.System) ? _realKey : Key.None;} } ////// The state of the key referenced by the event. /// public KeyStates KeyStates { get {return this.KeyboardDevice.GetKeyStates(_realKey);} } ////// Whether the key pressed is a repeated key or not. /// public bool IsRepeat { get {return _isRepeat;} } ////// Whether or not the key referenced by the event is down. /// ///public bool IsDown { get {return this.KeyboardDevice.IsKeyDown(_realKey);} } /// /// Whether or not the key referenced by the event is up. /// ///public bool IsUp { get {return this.KeyboardDevice.IsKeyUp(_realKey);} } /// /// Whether or not the key referenced by the event is toggled. /// ///public bool IsToggled { get {return this.KeyboardDevice.IsKeyToggled(_realKey);} } /// /// The mechanism used to call the type-specific handler on the /// target. /// /// /// The generic handler to call in a type-specific way. /// /// /// The target to call the handler on. /// ///protected override void InvokeEventHandler(Delegate genericHandler, object genericTarget) { KeyEventHandler handler = (KeyEventHandler) genericHandler; handler(genericTarget, this); } internal void SetRepeat( bool newRepeatState ) { _isRepeat = newRepeatState; } internal void MarkNormal() { _key = _realKey; } internal void MarkSystem() { _key = Key.System; } internal void MarkImeProcessed() { _key = Key.ImeProcessed; } /// /// Critical - hands out _inputSource. /// internal PresentationSource UnsafeInputSource { [SecurityCritical] get { return _inputSource; } } internal int ScanCode { get {return _scanCode;} set {_scanCode = value;} } internal bool IsExtendedKey { get {return _isExtendedKey;} set {_isExtendedKey = value;} } private Key _realKey; private Key _key; ////// Critical - PresentationSource required elevations to create it. /// [SecurityCritical] private PresentationSource _inputSource; private bool _isRepeat; private int _scanCode; private bool _isExtendedKey; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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