Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Input / Command / RoutedCommand.cs / 1305600 / RoutedCommand.cs
//----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//---------------------------------------------------------------------------
using System;
using System.Security;
using System.Security.Permissions;
using System.ComponentModel;
using System.Collections;
using System.Windows;
using System.Windows.Input;
using System.Windows.Markup;
using SR = MS.Internal.PresentationCore.SR;
using SRID = MS.Internal.PresentationCore.SRID;
namespace System.Windows.Input
{
///
/// A command that causes handlers associated with it to be called.
///
[TypeConverter("System.Windows.Input.CommandConverter, PresentationFramework, Version=" + Microsoft.Internal.BuildInfo.WCP_VERSION + ", Culture=neutral, PublicKeyToken=" + Microsoft.Internal.BuildInfo.WCP_PUBLIC_KEY_TOKEN + ", Custom=null")]
[ValueSerializer("System.Windows.Input.CommandValueSerializer, PresentationFramework, Version=" + Microsoft.Internal.BuildInfo.WCP_VERSION + ", Culture=neutral, PublicKeyToken=" + Microsoft.Internal.BuildInfo.WCP_PUBLIC_KEY_TOKEN + ", Custom=null")]
public class RoutedCommand : ICommand
{
#region Constructors
///
/// Default Constructor - needed to allow markup creation
///
public RoutedCommand()
{
_name = String.Empty;
_ownerType = null;
_inputGestureCollection = null;
}
///
/// RoutedCommand Constructor with Name and OwnerType
///
/// Declared Name of the RoutedCommand for Serialization
/// Type that is registering the property
public RoutedCommand(string name, Type ownerType) : this(name, ownerType, null)
{
}
///
/// RoutedCommand Constructor with Name and OwnerType
///
/// Declared Name of the RoutedCommand for Serialization
/// Type that is registering the property
/// Default Input Gestures associated
public RoutedCommand(string name, Type ownerType, InputGestureCollection inputGestures)
{
if (name == null)
{
throw new ArgumentNullException("name");
}
if (name.Length == 0)
{
throw new ArgumentException(SR.Get(SRID.StringEmpty), "name");
}
if (ownerType == null)
{
throw new ArgumentNullException("ownerType");
}
_name = name;
_ownerType = ownerType;
_inputGestureCollection = inputGestures;
}
///
/// RoutedCommand Constructor with Name and OwnerType and command identifier.
///
/// Declared Name of the RoutedCommand for Serialization
/// Type that is registering the property
/// Byte identifier for the command assigned by the owning type
internal RoutedCommand(string name, Type ownerType, byte commandId) : this(name, ownerType, null)
{
_commandId = commandId;
}
#endregion
#region ICommand
///
/// Executes the command with the given parameter on the currently focused element.
///
/// Parameter to pass to any command handlers.
void ICommand.Execute(object parameter)
{
Execute(parameter, FilterInputElement(Keyboard.FocusedElement));
}
///
/// Whether the command can be executed with the given parameter on the currently focused element.
///
/// Parameter to pass to any command handlers.
/// true if the command can be executed, false otherwise.
///
/// Critical: This code takes in a trusted bit which can be used to cause elevations for paste
/// PublicOK: This code passes the flag in as false
///
[SecurityCritical]
bool ICommand.CanExecute(object parameter)
{
bool unused;
return CanExecuteImpl(parameter, FilterInputElement(Keyboard.FocusedElement), false, out unused);
}
///
/// Raised when CanExecute should be requeried on commands.
/// Since commands are often global, it will only hold onto the handler as a weak reference.
/// Users of this event should keep a strong reference to their event handler to avoid
/// it being garbage collected. This can be accomplished by having a private field
/// and assigning the handler as the value before or after attaching to this event.
///
public event EventHandler CanExecuteChanged
{
add { CommandManager.RequerySuggested += value; }
remove { CommandManager.RequerySuggested -= value; }
}
#endregion
#region Public Methods
///
/// Executes the command with the given parameter on the given target.
///
/// Parameter to be passed to any command handlers.
/// Element at which to begin looking for command handlers.
///
/// Critical - calls critical function (ExecuteImpl)
/// PublicOk - always passes in false for userInitiated, which is safe
///
[SecurityCritical]
public void Execute(object parameter, IInputElement target)
{
// We only support UIElement, ContentElement and UIElement3D
if ((target != null) && !InputElement.IsValid(target))
{
throw new InvalidOperationException(SR.Get(SRID.Invalid_IInputElement, target.GetType()));
}
if (target == null)
{
target = FilterInputElement(Keyboard.FocusedElement);
}
ExecuteImpl(parameter, target, false);
}
///
/// Whether the command can be executed with the given parameter on the given target.
///
/// Parameter to be passed to any command handlers.
/// The target element on which to begin looking for command handlers.
/// true if the command can be executed, false otherwise.
///
/// Critical: This can be used to spoof input and cause userinitiated permission to be asserted
/// PublicOK: The call sets trusted bit to false which prevents user initiated permission from being asserted
///
[SecurityCritical]
public bool CanExecute(object parameter, IInputElement target)
{
bool unused;
return CriticalCanExecute(parameter, target, false, out unused);
}
///
/// Whether the command can be executed with the given parameter on the given target.
///
/// Parameter to be passed to any command handlers.
/// The target element on which to begin looking for command handlers.
/// Determines whether this call will elevate for userinitiated input or not.
/// Determines whether the input event (if any) that caused this command should continue its route.
/// true if the command can be executed, false otherwise.
///
/// Critical: This code takes in a trusted bit which can be used to cause elevations for paste
///
[SecurityCritical]
internal bool CriticalCanExecute(object parameter, IInputElement target, bool trusted, out bool continueRouting)
{
// We only support UIElement, ContentElement, and UIElement3D
if ((target != null) && !InputElement.IsValid(target))
{
throw new InvalidOperationException(SR.Get(SRID.Invalid_IInputElement, target.GetType()));
}
if (target == null)
{
target = FilterInputElement(Keyboard.FocusedElement);
}
return CanExecuteImpl(parameter, target, trusted, out continueRouting);
}
#endregion
#region Public Properties
///
/// Name - Declared time Name of the property/field where it is
/// defined, for serialization/debug purposes only.
/// Ex: public static RoutedCommand New { get { new RoutedCommand("New", .... ) } }
/// public static RoutedCommand New = new RoutedCommand("New", ... ) ;
///
public string Name
{
get
{
return _name;
}
}
///
/// Owning type of the property
///
public Type OwnerType
{
get
{
return _ownerType;
}
}
///
/// Identifier assigned by the owning Type. Note that this is not a global command identifier.
///
internal byte CommandId
{
get
{
return _commandId;
}
}
///
/// Input Gestures associated with RoutedCommand
///
public InputGestureCollection InputGestures
{
get
{
if(InputGesturesInternal == null)
{
_inputGestureCollection = new InputGestureCollection();
}
return _inputGestureCollection;
}
}
internal InputGestureCollection InputGesturesInternal
{
get
{
if(_inputGestureCollection == null && AreInputGesturesDelayLoaded)
{
_inputGestureCollection = GetInputGestures();
AreInputGesturesDelayLoaded = false;
}
return _inputGestureCollection;
}
}
///
/// Fetches the default input gestures for the command by invoking the LoadDefaultGestureFromResource function on the owning type.
///
/// collection of input gestures for the command
private InputGestureCollection GetInputGestures()
{
if(OwnerType == typeof(ApplicationCommands))
{
return ApplicationCommands.LoadDefaultGestureFromResource(_commandId);
}
else if(OwnerType == typeof(NavigationCommands))
{
return NavigationCommands.LoadDefaultGestureFromResource(_commandId);
}
else if(OwnerType == typeof(MediaCommands))
{
return MediaCommands.LoadDefaultGestureFromResource(_commandId);
}
else if(OwnerType == typeof(ComponentCommands))
{
return ComponentCommands.LoadDefaultGestureFromResource(_commandId);
}
return new InputGestureCollection();
}
///
/// Rights Management Enabledness
/// Will be set by Rights Management code.
///
internal bool IsBlockedByRM
{
[SecurityCritical]
get
{
return ReadPrivateFlag(PrivateFlags.IsBlockedByRM);
}
[UIPermissionAttribute(SecurityAction.LinkDemand, Unrestricted = true)]
[SecurityCritical]
set
{
WritePrivateFlag(PrivateFlags.IsBlockedByRM, value);
}
}
///
/// Critical: Calls WritePrivateFlag
/// TreatAsSafe: Setting IsBlockedByRM is a critical operation. Setting AreInputGesturesDelayLoaded isn't.
///
internal bool AreInputGesturesDelayLoaded
{
get
{
return ReadPrivateFlag(PrivateFlags.AreInputGesturesDelayLoaded);
}
[SecurityCritical, SecurityTreatAsSafe]
set
{
WritePrivateFlag(PrivateFlags.AreInputGesturesDelayLoaded, value);
}
}
#endregion
#region Implementation
private static IInputElement FilterInputElement(IInputElement elem)
{
// We only support UIElement, ContentElement, and UIElement3D
if ((elem != null) && InputElement.IsValid(elem))
{
return elem;
}
return null;
}
///
///
///
///
///
/// Critical: This code takes in a trusted bit which can be used to cause elevations for paste
///
[SecurityCritical]
private bool CanExecuteImpl(object parameter, IInputElement target, bool trusted, out bool continueRouting)
{
// If blocked by rights-management fall through and return false
if ((target != null) && !IsBlockedByRM)
{
// Raise the Preview Event, check the Handled value, and raise the regular event.
CanExecuteRoutedEventArgs args = new CanExecuteRoutedEventArgs(this, parameter);
args.RoutedEvent = CommandManager.PreviewCanExecuteEvent;
CriticalCanExecuteWrapper(parameter, target, trusted, args);
if (!args.Handled)
{
args.RoutedEvent = CommandManager.CanExecuteEvent;
CriticalCanExecuteWrapper(parameter, target, trusted, args);
}
continueRouting = args.ContinueRouting;
return args.CanExecute;
}
else
{
continueRouting = false;
return false;
}
}
///
/// Critical: This code takes in a trusted bit which can be used to cause elevations for paste
///
[SecurityCritical]
private void CriticalCanExecuteWrapper(object parameter, IInputElement target, bool trusted, CanExecuteRoutedEventArgs args)
{
// This cast is ok since we are already testing for UIElement, ContentElement, or UIElement3D
// both of which derive from DO
DependencyObject targetAsDO = (DependencyObject)target;
if (InputElement.IsUIElement(targetAsDO))
{
((UIElement)targetAsDO).RaiseEvent(args, trusted);
}
else if (InputElement.IsContentElement(targetAsDO))
{
((ContentElement)targetAsDO).RaiseEvent(args, trusted);
}
else if (InputElement.IsUIElement3D(targetAsDO))
{
((UIElement3D)targetAsDO).RaiseEvent(args, trusted);
}
}
///
/// Critical - Calls ExecuteImpl, which 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 bool ExecuteCore(object parameter, IInputElement target, bool userInitiated)
{
if (target == null)
{
target = FilterInputElement(Keyboard.FocusedElement);
}
return ExecuteImpl(parameter, target, userInitiated);
}
///
/// 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]
private bool ExecuteImpl(object parameter, IInputElement target, bool userInitiated)
{
// If blocked by rights-management fall through and return false
if ((target != null) && !IsBlockedByRM)
{
UIElement targetUIElement = target as UIElement;
ContentElement targetAsContentElement = null;
UIElement3D targetAsUIElement3D = null;
// Raise the Preview Event and check for Handled value, and
// Raise the regular ExecuteEvent.
ExecutedRoutedEventArgs args = new ExecutedRoutedEventArgs(this, parameter);
args.RoutedEvent = CommandManager.PreviewExecutedEvent;
if (targetUIElement != null)
{
targetUIElement.RaiseEvent(args, userInitiated);
}
else
{
targetAsContentElement = target as ContentElement;
if (targetAsContentElement != null)
{
targetAsContentElement.RaiseEvent(args, userInitiated);
}
else
{
targetAsUIElement3D = target as UIElement3D;
if (targetAsUIElement3D != null)
{
targetAsUIElement3D.RaiseEvent(args, userInitiated);
}
}
}
if (!args.Handled)
{
args.RoutedEvent = CommandManager.ExecutedEvent;
if (targetUIElement != null)
{
targetUIElement.RaiseEvent(args, userInitiated);
}
else if (targetAsContentElement != null)
{
targetAsContentElement.RaiseEvent(args, userInitiated);
}
else if (targetAsUIElement3D != null)
{
targetAsUIElement3D.RaiseEvent(args, userInitiated);
}
}
return args.Handled;
}
return false;
}
#endregion
#region PrivateMethods
///
/// Critical - Accesses _flags. Setting IsBlockedByRM is a critical operation. Setting other flags should be fine.
///
[SecurityCritical]
private void WritePrivateFlag(PrivateFlags bit, bool value)
{
if (value)
{
_flags.Value |= bit;
}
else
{
_flags.Value &= ~bit;
}
}
private bool ReadPrivateFlag(PrivateFlags bit)
{
return (_flags.Value & bit) != 0;
}
#endregion PrivateMethods
#region Data
private string _name;
///
/// Critical : Holds the value to IsBlockedByRM which should not be settable from PartialTrust.
///
private MS.Internal.SecurityCriticalDataForSet _flags;
private enum PrivateFlags : byte
{
IsBlockedByRM = 0x01,
AreInputGesturesDelayLoaded = 0x02
}
private Type _ownerType;
private InputGestureCollection _inputGestureCollection;
private byte _commandId; //Note that this is NOT a global command identifier. It is specific to the owning type.
//it represents one of the CommandID enums defined by each of the command types and will be cast to one of them when used.
#endregion
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//---------------------------------------------------------------------------
using System;
using System.Security;
using System.Security.Permissions;
using System.ComponentModel;
using System.Collections;
using System.Windows;
using System.Windows.Input;
using System.Windows.Markup;
using SR = MS.Internal.PresentationCore.SR;
using SRID = MS.Internal.PresentationCore.SRID;
namespace System.Windows.Input
{
///
/// A command that causes handlers associated with it to be called.
///
[TypeConverter("System.Windows.Input.CommandConverter, PresentationFramework, Version=" + Microsoft.Internal.BuildInfo.WCP_VERSION + ", Culture=neutral, PublicKeyToken=" + Microsoft.Internal.BuildInfo.WCP_PUBLIC_KEY_TOKEN + ", Custom=null")]
[ValueSerializer("System.Windows.Input.CommandValueSerializer, PresentationFramework, Version=" + Microsoft.Internal.BuildInfo.WCP_VERSION + ", Culture=neutral, PublicKeyToken=" + Microsoft.Internal.BuildInfo.WCP_PUBLIC_KEY_TOKEN + ", Custom=null")]
public class RoutedCommand : ICommand
{
#region Constructors
///
/// Default Constructor - needed to allow markup creation
///
public RoutedCommand()
{
_name = String.Empty;
_ownerType = null;
_inputGestureCollection = null;
}
///
/// RoutedCommand Constructor with Name and OwnerType
///
/// Declared Name of the RoutedCommand for Serialization
/// Type that is registering the property
public RoutedCommand(string name, Type ownerType) : this(name, ownerType, null)
{
}
///
/// RoutedCommand Constructor with Name and OwnerType
///
/// Declared Name of the RoutedCommand for Serialization
/// Type that is registering the property
/// Default Input Gestures associated
public RoutedCommand(string name, Type ownerType, InputGestureCollection inputGestures)
{
if (name == null)
{
throw new ArgumentNullException("name");
}
if (name.Length == 0)
{
throw new ArgumentException(SR.Get(SRID.StringEmpty), "name");
}
if (ownerType == null)
{
throw new ArgumentNullException("ownerType");
}
_name = name;
_ownerType = ownerType;
_inputGestureCollection = inputGestures;
}
///
/// RoutedCommand Constructor with Name and OwnerType and command identifier.
///
/// Declared Name of the RoutedCommand for Serialization
/// Type that is registering the property
/// Byte identifier for the command assigned by the owning type
internal RoutedCommand(string name, Type ownerType, byte commandId) : this(name, ownerType, null)
{
_commandId = commandId;
}
#endregion
#region ICommand
///
/// Executes the command with the given parameter on the currently focused element.
///
/// Parameter to pass to any command handlers.
void ICommand.Execute(object parameter)
{
Execute(parameter, FilterInputElement(Keyboard.FocusedElement));
}
///
/// Whether the command can be executed with the given parameter on the currently focused element.
///
/// Parameter to pass to any command handlers.
/// true if the command can be executed, false otherwise.
///
/// Critical: This code takes in a trusted bit which can be used to cause elevations for paste
/// PublicOK: This code passes the flag in as false
///
[SecurityCritical]
bool ICommand.CanExecute(object parameter)
{
bool unused;
return CanExecuteImpl(parameter, FilterInputElement(Keyboard.FocusedElement), false, out unused);
}
///
/// Raised when CanExecute should be requeried on commands.
/// Since commands are often global, it will only hold onto the handler as a weak reference.
/// Users of this event should keep a strong reference to their event handler to avoid
/// it being garbage collected. This can be accomplished by having a private field
/// and assigning the handler as the value before or after attaching to this event.
///
public event EventHandler CanExecuteChanged
{
add { CommandManager.RequerySuggested += value; }
remove { CommandManager.RequerySuggested -= value; }
}
#endregion
#region Public Methods
///
/// Executes the command with the given parameter on the given target.
///
/// Parameter to be passed to any command handlers.
/// Element at which to begin looking for command handlers.
///
/// Critical - calls critical function (ExecuteImpl)
/// PublicOk - always passes in false for userInitiated, which is safe
///
[SecurityCritical]
public void Execute(object parameter, IInputElement target)
{
// We only support UIElement, ContentElement and UIElement3D
if ((target != null) && !InputElement.IsValid(target))
{
throw new InvalidOperationException(SR.Get(SRID.Invalid_IInputElement, target.GetType()));
}
if (target == null)
{
target = FilterInputElement(Keyboard.FocusedElement);
}
ExecuteImpl(parameter, target, false);
}
///
/// Whether the command can be executed with the given parameter on the given target.
///
/// Parameter to be passed to any command handlers.
/// The target element on which to begin looking for command handlers.
/// true if the command can be executed, false otherwise.
///
/// Critical: This can be used to spoof input and cause userinitiated permission to be asserted
/// PublicOK: The call sets trusted bit to false which prevents user initiated permission from being asserted
///
[SecurityCritical]
public bool CanExecute(object parameter, IInputElement target)
{
bool unused;
return CriticalCanExecute(parameter, target, false, out unused);
}
///
/// Whether the command can be executed with the given parameter on the given target.
///
/// Parameter to be passed to any command handlers.
/// The target element on which to begin looking for command handlers.
/// Determines whether this call will elevate for userinitiated input or not.
/// Determines whether the input event (if any) that caused this command should continue its route.
/// true if the command can be executed, false otherwise.
///
/// Critical: This code takes in a trusted bit which can be used to cause elevations for paste
///
[SecurityCritical]
internal bool CriticalCanExecute(object parameter, IInputElement target, bool trusted, out bool continueRouting)
{
// We only support UIElement, ContentElement, and UIElement3D
if ((target != null) && !InputElement.IsValid(target))
{
throw new InvalidOperationException(SR.Get(SRID.Invalid_IInputElement, target.GetType()));
}
if (target == null)
{
target = FilterInputElement(Keyboard.FocusedElement);
}
return CanExecuteImpl(parameter, target, trusted, out continueRouting);
}
#endregion
#region Public Properties
///
/// Name - Declared time Name of the property/field where it is
/// defined, for serialization/debug purposes only.
/// Ex: public static RoutedCommand New { get { new RoutedCommand("New", .... ) } }
/// public static RoutedCommand New = new RoutedCommand("New", ... ) ;
///
public string Name
{
get
{
return _name;
}
}
///
/// Owning type of the property
///
public Type OwnerType
{
get
{
return _ownerType;
}
}
///
/// Identifier assigned by the owning Type. Note that this is not a global command identifier.
///
internal byte CommandId
{
get
{
return _commandId;
}
}
///
/// Input Gestures associated with RoutedCommand
///
public InputGestureCollection InputGestures
{
get
{
if(InputGesturesInternal == null)
{
_inputGestureCollection = new InputGestureCollection();
}
return _inputGestureCollection;
}
}
internal InputGestureCollection InputGesturesInternal
{
get
{
if(_inputGestureCollection == null && AreInputGesturesDelayLoaded)
{
_inputGestureCollection = GetInputGestures();
AreInputGesturesDelayLoaded = false;
}
return _inputGestureCollection;
}
}
///
/// Fetches the default input gestures for the command by invoking the LoadDefaultGestureFromResource function on the owning type.
///
/// collection of input gestures for the command
private InputGestureCollection GetInputGestures()
{
if(OwnerType == typeof(ApplicationCommands))
{
return ApplicationCommands.LoadDefaultGestureFromResource(_commandId);
}
else if(OwnerType == typeof(NavigationCommands))
{
return NavigationCommands.LoadDefaultGestureFromResource(_commandId);
}
else if(OwnerType == typeof(MediaCommands))
{
return MediaCommands.LoadDefaultGestureFromResource(_commandId);
}
else if(OwnerType == typeof(ComponentCommands))
{
return ComponentCommands.LoadDefaultGestureFromResource(_commandId);
}
return new InputGestureCollection();
}
///
/// Rights Management Enabledness
/// Will be set by Rights Management code.
///
internal bool IsBlockedByRM
{
[SecurityCritical]
get
{
return ReadPrivateFlag(PrivateFlags.IsBlockedByRM);
}
[UIPermissionAttribute(SecurityAction.LinkDemand, Unrestricted = true)]
[SecurityCritical]
set
{
WritePrivateFlag(PrivateFlags.IsBlockedByRM, value);
}
}
///
/// Critical: Calls WritePrivateFlag
/// TreatAsSafe: Setting IsBlockedByRM is a critical operation. Setting AreInputGesturesDelayLoaded isn't.
///
internal bool AreInputGesturesDelayLoaded
{
get
{
return ReadPrivateFlag(PrivateFlags.AreInputGesturesDelayLoaded);
}
[SecurityCritical, SecurityTreatAsSafe]
set
{
WritePrivateFlag(PrivateFlags.AreInputGesturesDelayLoaded, value);
}
}
#endregion
#region Implementation
private static IInputElement FilterInputElement(IInputElement elem)
{
// We only support UIElement, ContentElement, and UIElement3D
if ((elem != null) && InputElement.IsValid(elem))
{
return elem;
}
return null;
}
///
///
///
///
///
/// Critical: This code takes in a trusted bit which can be used to cause elevations for paste
///
[SecurityCritical]
private bool CanExecuteImpl(object parameter, IInputElement target, bool trusted, out bool continueRouting)
{
// If blocked by rights-management fall through and return false
if ((target != null) && !IsBlockedByRM)
{
// Raise the Preview Event, check the Handled value, and raise the regular event.
CanExecuteRoutedEventArgs args = new CanExecuteRoutedEventArgs(this, parameter);
args.RoutedEvent = CommandManager.PreviewCanExecuteEvent;
CriticalCanExecuteWrapper(parameter, target, trusted, args);
if (!args.Handled)
{
args.RoutedEvent = CommandManager.CanExecuteEvent;
CriticalCanExecuteWrapper(parameter, target, trusted, args);
}
continueRouting = args.ContinueRouting;
return args.CanExecute;
}
else
{
continueRouting = false;
return false;
}
}
///
/// Critical: This code takes in a trusted bit which can be used to cause elevations for paste
///
[SecurityCritical]
private void CriticalCanExecuteWrapper(object parameter, IInputElement target, bool trusted, CanExecuteRoutedEventArgs args)
{
// This cast is ok since we are already testing for UIElement, ContentElement, or UIElement3D
// both of which derive from DO
DependencyObject targetAsDO = (DependencyObject)target;
if (InputElement.IsUIElement(targetAsDO))
{
((UIElement)targetAsDO).RaiseEvent(args, trusted);
}
else if (InputElement.IsContentElement(targetAsDO))
{
((ContentElement)targetAsDO).RaiseEvent(args, trusted);
}
else if (InputElement.IsUIElement3D(targetAsDO))
{
((UIElement3D)targetAsDO).RaiseEvent(args, trusted);
}
}
///
/// Critical - Calls ExecuteImpl, which 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 bool ExecuteCore(object parameter, IInputElement target, bool userInitiated)
{
if (target == null)
{
target = FilterInputElement(Keyboard.FocusedElement);
}
return ExecuteImpl(parameter, target, userInitiated);
}
///
/// 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]
private bool ExecuteImpl(object parameter, IInputElement target, bool userInitiated)
{
// If blocked by rights-management fall through and return false
if ((target != null) && !IsBlockedByRM)
{
UIElement targetUIElement = target as UIElement;
ContentElement targetAsContentElement = null;
UIElement3D targetAsUIElement3D = null;
// Raise the Preview Event and check for Handled value, and
// Raise the regular ExecuteEvent.
ExecutedRoutedEventArgs args = new ExecutedRoutedEventArgs(this, parameter);
args.RoutedEvent = CommandManager.PreviewExecutedEvent;
if (targetUIElement != null)
{
targetUIElement.RaiseEvent(args, userInitiated);
}
else
{
targetAsContentElement = target as ContentElement;
if (targetAsContentElement != null)
{
targetAsContentElement.RaiseEvent(args, userInitiated);
}
else
{
targetAsUIElement3D = target as UIElement3D;
if (targetAsUIElement3D != null)
{
targetAsUIElement3D.RaiseEvent(args, userInitiated);
}
}
}
if (!args.Handled)
{
args.RoutedEvent = CommandManager.ExecutedEvent;
if (targetUIElement != null)
{
targetUIElement.RaiseEvent(args, userInitiated);
}
else if (targetAsContentElement != null)
{
targetAsContentElement.RaiseEvent(args, userInitiated);
}
else if (targetAsUIElement3D != null)
{
targetAsUIElement3D.RaiseEvent(args, userInitiated);
}
}
return args.Handled;
}
return false;
}
#endregion
#region PrivateMethods
///
/// Critical - Accesses _flags. Setting IsBlockedByRM is a critical operation. Setting other flags should be fine.
///
[SecurityCritical]
private void WritePrivateFlag(PrivateFlags bit, bool value)
{
if (value)
{
_flags.Value |= bit;
}
else
{
_flags.Value &= ~bit;
}
}
private bool ReadPrivateFlag(PrivateFlags bit)
{
return (_flags.Value & bit) != 0;
}
#endregion PrivateMethods
#region Data
private string _name;
///
/// Critical : Holds the value to IsBlockedByRM which should not be settable from PartialTrust.
///
private MS.Internal.SecurityCriticalDataForSet _flags;
private enum PrivateFlags : byte
{
IsBlockedByRM = 0x01,
AreInputGesturesDelayLoaded = 0x02
}
private Type _ownerType;
private InputGestureCollection _inputGestureCollection;
private byte _commandId; //Note that this is NOT a global command identifier. It is specific to the owning type.
//it represents one of the CommandID enums defined by each of the command types and will be cast to one of them when used.
#endregion
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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