CommandHelpers.cs source code in C# .NET

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/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / Commands / CommandHelpers.cs / 1 / CommandHelpers.cs

                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
//--------------------------------------------------------------------------- 

using System; 
using System.Diagnostics; 
using System.Windows;
using System.Windows.Controls; 
using System.Windows.Input;
using System.Windows.Media;
using System.Security;
using System.Security.Permissions; 

namespace MS.Internal.Commands 
{ 
    internal static class CommandHelpers
    { 
        internal static void RegisterCommandHandler(Type controlType, RoutedCommand command, ExecutedRoutedEventHandler executedRoutedEventHandler, params InputGesture[] inputGestures)
        {
            RegisterCommandHandler(controlType, command, executedRoutedEventHandler, null, inputGestures);
        } 

        internal static void RegisterCommandHandler(Type controlType, RoutedCommand command, Key key, ModifierKeys modifierKeys, ExecutedRoutedEventHandler executedRoutedEventHandler, CanExecuteRoutedEventHandler canExecuteRoutedEventHandler) 
        { 
            RegisterCommandHandler(controlType, command, executedRoutedEventHandler, canExecuteRoutedEventHandler, new KeyGesture(key, modifierKeys));
        } 

        internal static void RegisterCommandHandler(Type controlType, RoutedCommand command, ExecutedRoutedEventHandler executedRoutedEventHandler, CanExecuteRoutedEventHandler canExecuteRoutedEventHandler, params InputGesture[] inputGestures)
        {
            // Validate parameters 
            Debug.Assert(controlType != null);
            Debug.Assert(command != null); 
            Debug.Assert(executedRoutedEventHandler != null); 
            // All other parameters may be null
 
            // Create command link for this command
            CommandManager.RegisterClassCommandBinding(controlType, new CommandBinding(command, executedRoutedEventHandler, canExecuteRoutedEventHandler));

            // Create additional input binding for this command 
            for (int i = 0; i < inputGestures.Length; i++)
            { 
                CommandManager.RegisterClassInputBinding(controlType, new InputBinding(command, inputGestures[i])); 
            }
        } 

        internal static bool CanExecuteCommandSource(ICommandSource commandSource)
        {
            ICommand command = commandSource.Command; 
            if (command != null)
            { 
                object parameter = commandSource.CommandParameter; 
                IInputElement target = commandSource.CommandTarget;
 
                RoutedCommand routed = command as RoutedCommand;
                if (routed != null)
                {
                    if (target == null) 
                    {
                        target = commandSource as IInputElement; 
                    } 
                    return routed.CanExecute(parameter, target);
                } 
                else
                {
                    return command.CanExecute(parameter);
                } 
            }
 
            return false; 
        }
 
        /// 
        ///     Executes the command on the given command source.
        /// 
        ///  
        ///     Critical - calls critical function (ExecuteCommandSource)
        ///     TreatAsSafe - always passes in false for userInitiated, which is safe 
        ///  
        [SecurityCritical, SecurityTreatAsSafe]
        internal static void ExecuteCommandSource(ICommandSource commandSource) 
        {
            CriticalExecuteCommandSource(commandSource, false);
        }
 
                /// 
        ///     Executes the command on the given command source. 
        ///  
        /// 
        /// Critical - sets the user initiated bit on a command, which is used 
        ///            for security purposes later. It is important to validate
        ///            the callers of this, and the implementation to make sure
        ///            that we only call MarkAsUserInitiated in the correct cases.
        ///  
        [SecurityCritical]
        internal static void CriticalExecuteCommandSource(ICommandSource commandSource, bool userInitiated) 
        { 
            ICommand command = commandSource.Command;
            if (command != null) 
            {
                object parameter = commandSource.CommandParameter;
                IInputElement target = commandSource.CommandTarget;
 
                RoutedCommand routed = command as RoutedCommand;
                if (routed != null) 
                { 
                    if (target == null)
                    { 
                        target = commandSource as IInputElement;
                    }
                    if (routed.CanExecute(parameter, target))
                    { 
                        routed.ExecuteCore(parameter, target, userInitiated);
                    } 
                } 
                else if (command.CanExecute(parameter))
                { 
                    command.Execute(parameter);
                }
            }
        } 
        // This allows a caller to override its ICommandSource values (used by Button and ScrollBar)
        internal static void ExecuteCommand(ICommand command, object parameter, IInputElement target) 
        { 
            RoutedCommand routed = command as RoutedCommand;
            if (routed != null) 
            {
                if (routed.CanExecute(parameter, target))
                {
                    routed.Execute(parameter, target); 
                }
            } 
            else if (command.CanExecute(parameter)) 
            {
                command.Execute(parameter); 
            }
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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