Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Input / Command / InputBinding.cs / 1 / InputBinding.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // //--------------------------------------------------------------------------- using System; using System.Security; // SecurityCritical, TreatAsSafe using System.Security.Permissions; using System.Windows; using System.Windows.Markup; using System.ComponentModel; namespace System.Windows.Input { ////// InputBinding - InputGesture and ICommand combination /// Used to specify the binding between Gesture and Command at Element level. /// public class InputBinding : DependencyObject, ICommandSource { #region Constructor ////// Default Constructor - needed to allow markup creation /// protected InputBinding() { } ////// Constructor /// /// Command /// Input Gesture ////// Critical - may associate a secure command with a gesture, in /// these cases we need to demand the appropriate permission. /// TreatAsSafe - Calls CheckSecureCommand which does the appropriate demand. /// [SecurityCritical] public InputBinding(ICommand command, InputGesture gesture) { if (command == null) throw new ArgumentNullException("command"); if (gesture == null) throw new ArgumentNullException("gesture"); // Check before assignment to avoid continuation CheckSecureCommand(command, gesture); _command = command; _gesture = gesture; } #endregion Constructor //----------------------------------------------------- // // Public Methods // //----------------------------------------------------- #region Public Methods ////// Command Object associated /// ////// Critical - may associate a secure command with a gesture, in /// these cases we need to demand the appropriate permission. /// PublicOk - Calls CheckSecureCommand which does the appropriate demand. /// [TypeConverter("System.Windows.Input.CommandConverter, PresentationFramework, Version=" + Microsoft.Internal.BuildInfo.WCP_VERSION + ", Culture=neutral, PublicKeyToken=" + Microsoft.Internal.BuildInfo.WCP_PUBLIC_KEY_TOKEN + ", Custom=null")] [Localizability(LocalizationCategory.NeverLocalize)] // cannot be localized public ICommand Command { get { return _command; } [SecurityCritical] set { if (value == null) throw new ArgumentNullException("value"); lock (_dataLock) { // Check before assignment to avoid continuation // CheckSecureCommand(value, _gesture); _command = value; } } } ////// A parameter for the command. /// public object CommandParameter { get { return _commandParameter; } set { lock (_dataLock) { _commandParameter = value; } } } ////// Where the command should be raised. /// public IInputElement CommandTarget { get { return _commandTarget; } set { lock (_dataLock) { _commandTarget = value; } } } ////// InputGesture associated with the Command /// ////// Critical - may associate a secure command with a gesture, in /// these cases we need to demand the appropriate permission. /// PublicOk - Calls CheckSecureCommand which does the appropriate demand. /// public virtual InputGesture Gesture { // We would like to make this getter non-virtual but that's not legal // in C#. Luckily there is no security issue with leaving it virtual. get { return _gesture; } [SecurityCritical] set { if (value == null) throw new ArgumentNullException("value"); lock (_dataLock) { // Check before assignment to avoid continuation // CheckSecureCommand(_command, value); _gesture = value; } } } #endregion Public Methods //------------------------------------------------------ // // Internal Methods // //----------------------------------------------------- ////// Critical - determines if a command will later make an /// assert. This is critical to be right, because /// later we assume that the binding was protected. /// TreatAsSafe - Demand() is not an unsafe operation /// [SecurityCritical, SecurityTreatAsSafe] void CheckSecureCommand(ICommand command, InputGesture gesture) { ISecureCommand secure = command as ISecureCommand; if (secure != null) { secure.UserInitiatedPermission.Demand(); } } //------------------------------------------------------ // // Private Fields // //------------------------------------------------------ #region Private Fields private ICommand _command = null ; private InputGesture _gesture = null ; private object _commandParameter; private IInputElement _commandTarget; internal static object _dataLock = new object(); #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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