Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Controls / PasswordBox.cs / 1305600 / PasswordBox.cs
//----------------------------------------------------------------------------
//
// File: PasswordBox.cs
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
// Description: The stock password control.
//
//---------------------------------------------------------------------------
using System.Diagnostics;
using System.Collections;
using System.ComponentModel;
using System.Globalization;
using System.Security;
using System.Text;
using System.Windows.Media;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Automation;
using System.Windows.Automation.Peers;
using System.Windows.Input;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;
using MS.Internal;
using MS.Internal.KnownBoxes;
using System.Security.Permissions;
using System.Windows.Controls.Primitives;
#pragma warning disable 1634, 1691 // suppressing PreSharp warnings
namespace System.Windows.Controls
{
///
/// The stock password control.
///
#if OLD_AUTOMATION
[Automation(AccessibilityControlType = "Edit")]
#endif
[TemplatePart(Name = "PART_ContentHost", Type = typeof(FrameworkElement))]
public sealed class PasswordBox : Control, ITextBoxViewHost
#if OLD_AUTOMATION
, IAutomationPatternProvider, IAutomationPropertyProvider
#endif
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
///
/// Static constructor for PasswordBox.
///
static PasswordBox()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(PasswordBox), new FrameworkPropertyMetadata(typeof(PasswordBox)));
_dType = DependencyObjectType.FromSystemTypeInternal(typeof(PasswordBox));
// PasswordBox properties
// ------------------
PasswordCharProperty.OverrideMetadata(typeof(PasswordBox),
new FrameworkPropertyMetadata(new PropertyChangedCallback(OnPasswordCharChanged)));
// Declaree listener for Padding property
Control.PaddingProperty.OverrideMetadata(typeof(PasswordBox),
new FrameworkPropertyMetadata(new PropertyChangedCallback(OnPaddingChanged)));
// Prevent journaling
NavigationService.NavigationServiceProperty.OverrideMetadata(typeof(PasswordBox), new FrameworkPropertyMetadata(new PropertyChangedCallback(OnParentNavigationServiceChanged)));
InputMethod.IsInputMethodEnabledProperty.OverrideMetadata(typeof(PasswordBox),
new FrameworkPropertyMetadata(
BooleanBoxes.FalseBox,
FrameworkPropertyMetadataOptions.Inherits,
null,
//
new CoerceValueCallback(ForceToFalse)));
// VSM
IsEnabledProperty.OverrideMetadata(typeof(PasswordBox), new UIPropertyMetadata(new PropertyChangedCallback(OnVisualStatePropertyChanged)));
IsMouseOverPropertyKey.OverrideMetadata(typeof(PasswordBox), new UIPropertyMetadata(new PropertyChangedCallback(OnVisualStatePropertyChanged)));
TextBoxBase.SelectionBrushProperty.OverrideMetadata(typeof(PasswordBox),
new FrameworkPropertyMetadata(new PropertyChangedCallback(UpdateCaretElement)));
TextBoxBase.SelectionOpacityProperty.OverrideMetadata(typeof(PasswordBox),
new FrameworkPropertyMetadata(new PropertyChangedCallback(UpdateCaretElement)));
TextBoxBase.CaretBrushProperty.OverrideMetadata(typeof(PasswordBox),
new FrameworkPropertyMetadata(new PropertyChangedCallback(UpdateCaretElement)));
}
///
/// Constructor.
///
public PasswordBox() : base()
{
Initialize();
}
#endregion Constructors
//------------------------------------------------------
//
// Public Methods
//
//-----------------------------------------------------
#region Public Methods
///
/// Replaces the current selection in the passwordbox with the contents
/// of the Clipboard
///
public void Paste()
{
RoutedCommand command = ApplicationCommands.Paste;
command.Execute(null, this);
}
///
/// Select all text in the PasswordBox
///
public void SelectAll()
{
Selection.Select(TextContainer.Start, TextContainer.End);
}
///
/// Clear all the content in the PasswordBox control.
///
public void Clear()
{
this.Password = String.Empty;
}
#endregion Public Methods
//------------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
#region Public Properties
///
/// Contents of the PasswordBox.
///
///
/// Use the SecurePassword property in place of this one when possible.
/// Doing so reduces the risk of revealing content that should be kept secret.
///
///
/// Critical - The getter elevates to unmanaged code and has unsafe code block.
/// The setter calls SetSecurePassword.
///
/// PublicOK: Does not pass unsafe data to native code.
/// Does not pass 2nd party SecureString to SetSecurePassword.
///
///
[DefaultValue("")]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public string Password
{
[SecurityCritical]
get
{
string password;
using (SecureString securePassword = this.SecurePassword)
{
IntPtr ptr = System.Runtime.InteropServices.Marshal.SecureStringToBSTR(securePassword);
try
{
unsafe
{
password = new string((char*)ptr);
}
}
finally
{
System.Runtime.InteropServices.Marshal.ZeroFreeBSTR(ptr);
}
}
return password;
}
[SecurityCritical]
set
{
if (value == null)
{
value = String.Empty;
}
using (SecureString securePassword = new SecureString())
{
#pragma warning suppress 6506 // value is set to String.Empty if it was null.
for (int i = 0; i < value.Length; i++)
{
securePassword.AppendChar(value[i]);
}
SetSecurePassword(securePassword);
}
}
}
///
/// Contents of the PasswordBox.
///
///
/// Reading the Password always returns a copy which may be safely
/// Disposed.
///
/// Setting the value always stores a copy of the supplied value.
///
///
/// Do not add public setter, see SetSecurePassword comments.
///
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public SecureString SecurePassword
{
get
{
return this.TextContainer.GetPasswordCopy();
}
}
///
/// The DependencyID for the PasswordChar property.
/// Default Value: '*'
///
public static readonly DependencyProperty PasswordCharProperty =
DependencyProperty.RegisterAttached(
"PasswordChar", // Property name
typeof(char), // Property type
typeof(PasswordBox), // Property owner
new FrameworkPropertyMetadata('*')); // Flags
///
/// Character to display instead of the actual password.
///
public char PasswordChar
{
get { return (char) GetValue(PasswordCharProperty); }
set { SetValue(PasswordCharProperty, value); }
}
///
/// The limit number of characters that the PasswordBox or other editable controls can contain.
/// if it is 0, means no-limitation.
/// User can set this value for some simple single line PasswordBox to restrict the text number.
/// By default it is 0.
///
///
/// When this property is set to zero, the maximum length of the text that can be entered
/// in the control is limited only by available memory. You can use this property to restrict
/// the length of text entered in the control for values such as postal codes and telephone numbers.
/// You can also use this property to restrict the length of text entered when the data is to be entered
/// in a database.
/// You can limit the text entered into the control to the maximum length of the corresponding field in the database.
/// Note: In code, you can set the value of the Text property to a value that is larger than
/// the value specified by the MaxLength property.
/// This property only affects text entered into the control at runtime.
///
public static readonly DependencyProperty MaxLengthProperty =
TextBox.MaxLengthProperty.AddOwner(typeof(PasswordBox));
///
/// Maximum number of characters the PasswordBox can accept
///
[DefaultValue((int)0)]
public int MaxLength
{
get { return (int) GetValue(MaxLengthProperty); }
set { SetValue(MaxLengthProperty, value); }
}
///
///
public static readonly DependencyProperty SelectionBrushProperty =
TextBoxBase.SelectionBrushProperty.AddOwner(typeof(PasswordBox));
///
///
public Brush SelectionBrush
{
get { return (Brush)GetValue(SelectionBrushProperty); }
set { SetValue(SelectionBrushProperty, value); }
}
///
///
public static readonly DependencyProperty SelectionOpacityProperty =
TextBoxBase.SelectionOpacityProperty.AddOwner(typeof(PasswordBox));
///
///
public double SelectionOpacity
{
get { return (double)GetValue(SelectionOpacityProperty); }
set { SetValue(SelectionOpacityProperty, value); }
}
///
///
public static readonly DependencyProperty CaretBrushProperty =
TextBoxBase.CaretBrushProperty.AddOwner(typeof(PasswordBox));
///
///
public Brush CaretBrush
{
get { return (Brush)GetValue(CaretBrushProperty); }
set { SetValue(CaretBrushProperty, value); }
}
#endregion Public Properties
//-----------------------------------------------------
//
// Public Events
//
//------------------------------------------------------
#region Public Events
///
/// Event for "Text has changed"
///
///
/// Unlike most RoutedEvents on Controls, PasswordChangedEvent does not
/// have a matching protected virtual OnPasswordChanged method --
/// because PasswordBox is sealed.
///
public static readonly RoutedEvent PasswordChangedEvent = EventManager.RegisterRoutedEvent(
"PasswordChanged", // Event name
RoutingStrategy.Bubble, //
typeof(RoutedEventHandler), //
typeof(PasswordBox)); //
///
/// Event fired from this text box when its inner content
/// has been changed.
///
///
/// It is redirected from inner TextContainer.Changed event.
///
public event RoutedEventHandler PasswordChanged
{
add
{
AddHandler(PasswordChangedEvent, value);
}
remove
{
RemoveHandler(PasswordChangedEvent, value);
}
}
#endregion Public Events
//-----------------------------------------------------
//
// Protected Methods
//
//-----------------------------------------------------
#region Protected Methods
internal override void ChangeVisualState(bool useTransitions)
{
if (!IsEnabled)
{
VisualStates.GoToState(this, useTransitions, VisualStates.StateDisabled, VisualStates.StateNormal);
}
else if (IsMouseOver)
{
VisualStates.GoToState(this, useTransitions, VisualStates.StateMouseOver, VisualStates.StateNormal);
}
else
{
VisualStateManager.GoToState(this, VisualStates.StateNormal, useTransitions);
}
if (IsKeyboardFocused)
{
VisualStates.GoToState(this, useTransitions, VisualStates.StateFocused, VisualStates.StateUnfocused);
}
else
{
VisualStateManager.GoToState(this, VisualStates.StateUnfocused, useTransitions);
}
base.ChangeVisualState(useTransitions);
}
///
/// Creates AutomationPeer (
protected override AutomationPeer OnCreateAutomationPeer()
{
return new PasswordBoxAutomationPeer(this);
}
///
/// Called when the Template's tree has been generated
///
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
AttachToVisualTree();
}
///
/// Template has changed
///
///
///
///
///
protected override void OnTemplateChanged(ControlTemplate oldTemplate, ControlTemplate newTemplate)
{
base.OnTemplateChanged(oldTemplate, newTemplate);
if (oldTemplate!=null && newTemplate!= null && oldTemplate.VisualTree != newTemplate.VisualTree)
{
DetachFromVisualTree();
}
}
///
///
/// Virtual method reporting a key was pressed
///
protected override void OnKeyDown(KeyEventArgs e)
{
base.OnKeyDown(e);
if (e.Handled)
{
return;
}
_textEditor.OnKeyDown(e);
}
///
/// Virtual method reporting a key was released
///
protected override void OnKeyUp(KeyEventArgs e)
{
base.OnKeyUp(e);
if (e.Handled)
{
return;
}
_textEditor.OnKeyUp(e);
}
///
/// Virtual method reporting text composition
///
protected override void OnTextInput(TextCompositionEventArgs e)
{
base.OnTextInput(e);
if (e.Handled)
{
return;
}
_textEditor.OnTextInput(e);
}
///
/// Virtual method reporting the mouse button was pressed
///
protected override void OnMouseDown(MouseButtonEventArgs e)
{
base.OnMouseDown(e);
if (e.Handled)
{
return;
}
_textEditor.OnMouseDown(e);
}
///
/// Virtual method reporting a mouse move
///
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
if (e.Handled)
{
return;
}
_textEditor.OnMouseMove(e);
}
///
/// Virtual method reporting the mouse button was released
///
protected override void OnMouseUp(MouseButtonEventArgs e)
{
base.OnMouseUp(e);
if (e.Handled)
{
return;
}
_textEditor.OnMouseUp(e);
}
///
/// Virtual method reporting the cursor to display was requested
///
protected override void OnQueryCursor(QueryCursorEventArgs e)
{
base.OnQueryCursor(e);
if (e.Handled)
{
return;
}
_textEditor.OnQueryCursor(e);
}
///
/// Virtual method reporting the query continue drag is going to happen
///
protected override void OnQueryContinueDrag(QueryContinueDragEventArgs e)
{
base.OnQueryContinueDrag(e);
if (e.Handled)
{
return;
}
_textEditor.OnQueryContinueDrag(e);
}
///
/// Virtual method reporting the give feedback is going to happen
///
protected override void OnGiveFeedback(GiveFeedbackEventArgs e)
{
base.OnGiveFeedback(e);
if (e.Handled)
{
return;
}
_textEditor.OnGiveFeedback(e);
}
///
/// Virtual method reporting the drag enter is going to happen
///
protected override void OnDragEnter(DragEventArgs e)
{
base.OnDragEnter(e);
if (e.Handled)
{
return;
}
_textEditor.OnDragEnter(e);
}
///
/// Virtual method reporting the drag over is going to happen
///
protected override void OnDragOver(DragEventArgs e)
{
base.OnDragOver(e);
if (e.Handled)
{
return;
}
_textEditor.OnDragOver(e);
}
///
/// Virtual method reporting the drag leave is going to happen
///
protected override void OnDragLeave(DragEventArgs e)
{
base.OnDragLeave(e);
if (e.Handled)
{
return;
}
_textEditor.OnDragLeave(e);
}
///
/// Virtual method reporting the drag enter is going to happen
///
protected override void OnDrop(DragEventArgs e)
{
base.OnDrop(e);
if (e.Handled)
{
return;
}
_textEditor.OnDrop(e);
}
///
/// Called when ContextMenuOpening is raised on this element.
///
/// Event arguments
protected override void OnContextMenuOpening(ContextMenuEventArgs e)
{
base.OnContextMenuOpening(e);
if (e.Handled)
{
return;
}
_textEditor.OnContextMenuOpening(e);
}
///
/// Virtual method reporting that the keyboard is focused on this element
///
protected override void OnGotKeyboardFocus(KeyboardFocusChangedEventArgs e)
{
base.OnGotKeyboardFocus(e);
if (e.Handled)
{
return;
}
_textEditor.OnGotKeyboardFocus(e);
}
///
/// Virtual method reporting that the keyboard is no longer focusekeyboard is no longer focuseed
///
protected override void OnLostKeyboardFocus(KeyboardFocusChangedEventArgs e)
{
base.OnLostKeyboardFocus(e);
if (e.Handled)
{
return;
}
_textEditor.OnLostKeyboardFocus(e);
}
///
/// This method is invoked when the IsFocused property changes to false
///
/// RoutedEventArgs
protected override void OnLostFocus(RoutedEventArgs e)
{
base.OnLostFocus(e);
if (e.Handled)
{
return;
}
_textEditor.OnLostFocus(e);
}
#endregion Protected Methods
//-----------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
#region Internal Properties
// A TextContainer covering the PasswordBox's inner content.
internal PasswordTextContainer TextContainer
{
get
{
return _textContainer;
}
}
///
/// readonly access to internal content control
///
internal FrameworkElement RenderScope
{
get
{
return _renderScope;
}
}
internal ScrollViewer ScrollViewer
{
get
{
if (_scrollViewer == null)
{
if (_textEditor != null)
{
_scrollViewer = _textEditor._Scroller as ScrollViewer;
}
}
return _scrollViewer;
}
}
// ITextContainer holding the Control content.
ITextContainer ITextBoxViewHost.TextContainer
{
get
{
return this.TextContainer;
}
}
// Set true when typography property values are all default values.
bool ITextBoxViewHost.IsTypographyDefaultValue
{
get
{
return true;
}
}
#endregion Internal Properties
//-----------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
#region Private Methods
// Worker for the ctors, initializes a new PasswordBox instance.
private void Initialize()
{
// Register static editing command handlers.
// This only has an effect that first time we make the call.
// We don't use the static ctor because there are cases
// where another control will want to alias our properties
// but doesn't need this overhead.
TextEditor.RegisterCommandHandlers(typeof(PasswordBox), /*acceptsRichContent:*/false, /*readOnly*/false, /*registerEventListeners*/false);
// Create TextContainer
InitializeTextContainer(new PasswordTextContainer(this));
// PasswordBox only accepts plain text, so change TextEditor's default to that.
_textEditor.AcceptsRichContent = false;
// PasswordBox does not accetps tabs.
_textEditor.AcceptsTab = false;
}
// Attaches this control to a new TextContainer.
private void InitializeTextContainer(PasswordTextContainer textContainer)
{
Invariant.Assert(textContainer != null);
// Uninitialize previous TextEditor
if (_textContainer != null)
{
Invariant.Assert(_textEditor != null);
Invariant.Assert(_textEditor.TextContainer == _textContainer);
// Detach existing editor from VisualTree
DetachFromVisualTree();
// Discard TextEditor - must release text container
_textEditor.OnDetach();
}
// Save text container
_textContainer = textContainer;
//
((ITextContainer)_textContainer).Changed += new TextContainerChangedEventHandler(OnTextContainerChanged);
// Create a text editor, initialize undo manager for it, and link it to text container
_textEditor = new TextEditor(_textContainer, this, true);
}
// Disable IME input unconditionally. We really can't support
// IMEs in this control, because PasswordTextContainer doesn't
// round-trip content, which breaks the cicero contract.
// Additionally, from a UI standpoint, we don't want to break
// user expectations by allowing IME input. IMEs do cool things
// like learn from user corrections, so the same keystroke sequence
// might produce different text over time.
private static object ForceToFalse(DependencyObject d, object value)
{
return BooleanBoxes.FalseBox;
}
///
/// Callback for changes to the PasswordChar property.
///
private static void OnPasswordCharChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
PasswordBox passwordBox = (PasswordBox)d;
// Force a layout refresh to display the new char.
if (passwordBox._renderScope != null)
{
passwordBox._renderScope.InvalidateMeasure();
}
}
///
/// Handler for text array change notifications.
///
///
/// sender
///
///
/// event args
///
private void OnTextContainerChanged(object sender, TextContainerChangedEventArgs e)
{
// If only properties on the text changed, don't fire a content change event.
// This can happen even in a plain text TextBox if we switch logical trees.
if (!e.HasContentAddedOrRemoved)
{
return;
}
RaiseEvent(new RoutedEventArgs(PasswordChangedEvent));
}
///
/// Walk the visual tree until we find a Text control with IsPasswordBoxContent == true
/// and a ScrollViewer
///
private void SetRenderScopeToContentHost(TextBoxView renderScope)
{
// Clear the content host from previous render scope (if any)
ClearContentHost();
// Find ContentHostTemplateName in the style
_passwordBoxContentHost = GetTemplateChild(ContentHostTemplateName) as FrameworkElement;
// Note that we allow ContentHostTemplateName to be optional.
// This simplifies toolability of our control styling.
// When the ContentHostTemplateName is not found or incorrect
// PasswordBox goes into disabled state, but does not throw.
// Add renderScope as a child of ContentHostTemplateName
_renderScope = renderScope;
if (_passwordBoxContentHost is ScrollViewer)
{
ScrollViewer scrollViewer = (ScrollViewer)_passwordBoxContentHost;
if (scrollViewer.Content != null)
{
throw new NotSupportedException(SR.Get(SRID.TextBoxScrollViewerMarkedAsTextBoxContentMustHaveNoContent));
}
else
{
scrollViewer.Content = _renderScope;
}
}
else if (_passwordBoxContentHost is Decorator)
{
Decorator decorator = (Decorator)_passwordBoxContentHost;
if (decorator.Child != null)
{
throw new NotSupportedException(SR.Get(SRID.TextBoxDecoratorMarkedAsTextBoxContentMustHaveNoContent));
}
else
{
decorator.Child = _renderScope; // this may replace old render scope in case of upgrade scenario in TextBox
}
}
else
{
// When we implement TextContainer setting via TextView interface
// all text containing element will become allowed here.
_renderScope = null;
// Explicitly not throwing an exception here when content host = null
// -- designers need us to support no content scenarios
if (_passwordBoxContentHost != null)
{
_passwordBoxContentHost = null;
//
throw new NotSupportedException(SR.Get(SRID.PasswordBoxInvalidTextContainer));
}
}
// Attach render scope to TextEditor
InitializeRenderScope();
FrameworkElement element = _renderScope;
while (element != this && element != null) // checking both just to be safe
{
if (element is Border)
{
_border = (Border)element;
}
element = element.Parent as FrameworkElement;
}
}
private void ClearContentHost()
{
// Detach render scope from TextEditor
UninitializeRenderScope();
// Render scope has been created by us,
// so we need to extract if from visual tree.
if (_passwordBoxContentHost is ScrollViewer)
{
((ScrollViewer)_passwordBoxContentHost).Content = null;
}
else if (_passwordBoxContentHost is Decorator)
{
((Decorator)_passwordBoxContentHost).Child = null;
}
else
{
Invariant.Assert(_passwordBoxContentHost == null, "_passwordBoxContentHost must be null here");
}
_passwordBoxContentHost = null;
}
// Initializes a new render scope.
private void InitializeRenderScope()
{
if (_renderScope == null)
{
return;
}
// Attach the renderScope to TextEditor as its ITextView member.
ITextView textview = TextEditor.GetTextView(_renderScope);
_textEditor.TextView = textview;
this.TextContainer.TextView = textview;
if (this.ScrollViewer != null)
{
this.ScrollViewer.CanContentScroll = true;
}
}
// Uninitializes a render scope and clears this control's reference.
private void UninitializeRenderScope()
{
// Clear TextView property in TextEditor
_textEditor.TextView = null;
}
// Resets the selection to the start of the content.
// Called after non-TOM changes to the content, like
// set_Text
private void ResetSelection()
{
Select(0, 0);
if (this.ScrollViewer != null)
{
this.ScrollViewer.ScrollToHome();
}
}
///
/// Select the text in the given position and length.
///
private void Select(int start, int length)
{
ITextPointer selectionStart;
ITextPointer selectionEnd;
// VerifyAccess();
if (start < 0)
{
throw new ArgumentOutOfRangeException("start", SR.Get(SRID.ParameterCannotBeNegative));
}
if (length < 0)
{
throw new ArgumentOutOfRangeException("length", SR.Get(SRID.ParameterCannotBeNegative));
}
// Identify new selection start position
selectionStart = this.TextContainer.Start.CreatePointer();
while (start-- > 0 && selectionStart.MoveToNextInsertionPosition(LogicalDirection.Forward))
{
}
// Identify new selection end position
selectionEnd = selectionStart.CreatePointer();
while (length-- > 0 && selectionEnd.MoveToNextInsertionPosition(LogicalDirection.Forward))
{
}
Selection.Select(selectionStart, selectionEnd);
}
///
/// Callback for TextBox.Padding property setting
///
///
/// TextBoxBase on which the property is changed
///
/// event args
private static void OnPaddingChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
PasswordBox passwordBox = (PasswordBox)d;
if (passwordBox.ScrollViewer != null)
{
// translate this change into inner property set on ScrollViewer
object padding = passwordBox.GetValue(Control.PaddingProperty);
if (padding is Thickness)
{
passwordBox.ScrollViewer.Padding = (Thickness)padding;
}
else
{
passwordBox.ScrollViewer.ClearValue(Control.PaddingProperty);
}
}
}
// Set up listener for Navigating event
private static void OnParentNavigationServiceChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
PasswordBox passwordBox = (PasswordBox)o;
NavigationService navService = NavigationService.GetNavigationService(o);
if (passwordBox._navigationService != null)
{
passwordBox._navigationService.Navigating -= new NavigatingCancelEventHandler(passwordBox.OnNavigating);
}
if (navService != null)
{
navService.Navigating += new NavigatingCancelEventHandler(passwordBox.OnNavigating);
passwordBox._navigationService = navService;
}
else
{
passwordBox._navigationService = null;
}
}
// Clear password on navigation to prevent journaling.
private void OnNavigating(Object sender, NavigatingCancelEventArgs e)
{
this.Password = String.Empty;
}
///
/// Detaches the editor from old visual tree and attaches it to a new one
///
private void AttachToVisualTree()
{
DetachFromVisualTree();
// Walk the visual tree to find our Text element
SetRenderScopeToContentHost(new TextBoxView(this));
// Attach scroll handler to the new scroll viewer
// Note that this.ScrollViewer will walk the tree from current TextEditor's render scope up to its ui scope.
if (this.ScrollViewer != null)
{
this.ScrollViewer.HorizontalScrollBarVisibility = ScrollBarVisibility.Hidden;
this.ScrollViewer.VerticalScrollBarVisibility = ScrollBarVisibility.Disabled;
this.ScrollViewer.Focusable = false;
if (this.ScrollViewer.Background == null)
{
// prevent hit-testing through padding
this.ScrollViewer.Background = Brushes.Transparent;
}
OnPaddingChanged(this, new DependencyPropertyChangedEventArgs());
}
// Set border properties
if (_border != null)
{
_border.Style = null;
}
}
///
/// Clear our layout-specific data, and detach our current renderScope from our text editor.
///
private void DetachFromVisualTree()
{
if (_textEditor != null)
{
_textEditor.Selection.DetachFromVisualTree();
}
// Invalidate our cached copy of scroll viewer.
_scrollViewer = null;
_border = null;
ClearContentHost();
}
///
/// Sets the content of the control.
///
///
/// Critical - This method indirectly reveals value's SecureString content.
///
/// This method must never be passed a publicly supplied SecureString as long as we expose
/// a plain text get_Password property.
///
/// 1. Attacker sets SecureString value it does not have permission to read.
/// 2. Attacker reads Password property.
/// --> attacker has ----ed open a SecureString without UnmanagedCode permission.
///
[SecurityCritical]
private void SetSecurePassword(SecureString value)
{
this.TextContainer.BeginChange();
try
{
this.TextContainer.SetPassword(value);
this.ResetSelection();
}
finally
{
this.TextContainer.EndChange();
}
}
///
/// PropertyChanged callback for a property that affects the selection or caret rendering.
///
private static void UpdateCaretElement(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
PasswordBox passwordBox = (PasswordBox)d;
if (passwordBox.Selection != null)
{
CaretElement caretElement = passwordBox.Selection.CaretElement;
if (caretElement != null)
{
if (e.Property == CaretBrushProperty)
{
caretElement.UpdateCaretBrush(TextSelection.GetCaretBrush(passwordBox.Selection.TextEditor));
}
caretElement.InvalidateVisual();
}
}
}
#endregion Private methods
//------------------------------------------------------
//
// Private Properties
//
//-----------------------------------------------------
#region Private Properties
///
/// Text Selection (readonly)
///
private ITextSelection Selection
{
get
{
return _textEditor.Selection;
}
}
#endregion Private Properties
//------------------------------------------------------
//
// Private Fields
//
//-----------------------------------------------------
#region Private Fields
// TextEditor working in this control instance
private TextEditor _textEditor;
// Backing store for the control's content.
private PasswordTextContainer _textContainer;
// Encapsulated control that renders our TextContainer.
private TextBoxView _renderScope;
// ScrollViewer
private ScrollViewer _scrollViewer;
// Border
private Border _border;
// An element marked as ContentHostTemplateName which we assign our _renderScope as a child.
private FrameworkElement _passwordBoxContentHost;
// Default size for the control.
private const int _defaultWidth = 100;
private const int _defaultHeight = 20;
// Part name used in the style. The class TemplatePartAttribute should use the same name
private const string ContentHostTemplateName = "PART_ContentHost";
#endregion Private Fields
#region DTypeThemeStyleKey
// Returns the DependencyObjectType for the registered ThemeStyleKey's default
// value. Controls will override this method to return approriate types.
internal override DependencyObjectType DTypeThemeStyleKey
{
get { return _dType; }
}
private static DependencyObjectType _dType;
private NavigationService _navigationService;
#endregion DTypeThemeStyleKey
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
//
// File: PasswordBox.cs
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
// Description: The stock password control.
//
//---------------------------------------------------------------------------
using System.Diagnostics;
using System.Collections;
using System.ComponentModel;
using System.Globalization;
using System.Security;
using System.Text;
using System.Windows.Media;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Automation;
using System.Windows.Automation.Peers;
using System.Windows.Input;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;
using MS.Internal;
using MS.Internal.KnownBoxes;
using System.Security.Permissions;
using System.Windows.Controls.Primitives;
#pragma warning disable 1634, 1691 // suppressing PreSharp warnings
namespace System.Windows.Controls
{
///
/// The stock password control.
///
#if OLD_AUTOMATION
[Automation(AccessibilityControlType = "Edit")]
#endif
[TemplatePart(Name = "PART_ContentHost", Type = typeof(FrameworkElement))]
public sealed class PasswordBox : Control, ITextBoxViewHost
#if OLD_AUTOMATION
, IAutomationPatternProvider, IAutomationPropertyProvider
#endif
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
///
/// Static constructor for PasswordBox.
///
static PasswordBox()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(PasswordBox), new FrameworkPropertyMetadata(typeof(PasswordBox)));
_dType = DependencyObjectType.FromSystemTypeInternal(typeof(PasswordBox));
// PasswordBox properties
// ------------------
PasswordCharProperty.OverrideMetadata(typeof(PasswordBox),
new FrameworkPropertyMetadata(new PropertyChangedCallback(OnPasswordCharChanged)));
// Declaree listener for Padding property
Control.PaddingProperty.OverrideMetadata(typeof(PasswordBox),
new FrameworkPropertyMetadata(new PropertyChangedCallback(OnPaddingChanged)));
// Prevent journaling
NavigationService.NavigationServiceProperty.OverrideMetadata(typeof(PasswordBox), new FrameworkPropertyMetadata(new PropertyChangedCallback(OnParentNavigationServiceChanged)));
InputMethod.IsInputMethodEnabledProperty.OverrideMetadata(typeof(PasswordBox),
new FrameworkPropertyMetadata(
BooleanBoxes.FalseBox,
FrameworkPropertyMetadataOptions.Inherits,
null,
//
new CoerceValueCallback(ForceToFalse)));
// VSM
IsEnabledProperty.OverrideMetadata(typeof(PasswordBox), new UIPropertyMetadata(new PropertyChangedCallback(OnVisualStatePropertyChanged)));
IsMouseOverPropertyKey.OverrideMetadata(typeof(PasswordBox), new UIPropertyMetadata(new PropertyChangedCallback(OnVisualStatePropertyChanged)));
TextBoxBase.SelectionBrushProperty.OverrideMetadata(typeof(PasswordBox),
new FrameworkPropertyMetadata(new PropertyChangedCallback(UpdateCaretElement)));
TextBoxBase.SelectionOpacityProperty.OverrideMetadata(typeof(PasswordBox),
new FrameworkPropertyMetadata(new PropertyChangedCallback(UpdateCaretElement)));
TextBoxBase.CaretBrushProperty.OverrideMetadata(typeof(PasswordBox),
new FrameworkPropertyMetadata(new PropertyChangedCallback(UpdateCaretElement)));
}
///
/// Constructor.
///
public PasswordBox() : base()
{
Initialize();
}
#endregion Constructors
//------------------------------------------------------
//
// Public Methods
//
//-----------------------------------------------------
#region Public Methods
///
/// Replaces the current selection in the passwordbox with the contents
/// of the Clipboard
///
public void Paste()
{
RoutedCommand command = ApplicationCommands.Paste;
command.Execute(null, this);
}
///
/// Select all text in the PasswordBox
///
public void SelectAll()
{
Selection.Select(TextContainer.Start, TextContainer.End);
}
///
/// Clear all the content in the PasswordBox control.
///
public void Clear()
{
this.Password = String.Empty;
}
#endregion Public Methods
//------------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
#region Public Properties
///
/// Contents of the PasswordBox.
///
///
/// Use the SecurePassword property in place of this one when possible.
/// Doing so reduces the risk of revealing content that should be kept secret.
///
///
/// Critical - The getter elevates to unmanaged code and has unsafe code block.
/// The setter calls SetSecurePassword.
///
/// PublicOK: Does not pass unsafe data to native code.
/// Does not pass 2nd party SecureString to SetSecurePassword.
///
///
[DefaultValue("")]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public string Password
{
[SecurityCritical]
get
{
string password;
using (SecureString securePassword = this.SecurePassword)
{
IntPtr ptr = System.Runtime.InteropServices.Marshal.SecureStringToBSTR(securePassword);
try
{
unsafe
{
password = new string((char*)ptr);
}
}
finally
{
System.Runtime.InteropServices.Marshal.ZeroFreeBSTR(ptr);
}
}
return password;
}
[SecurityCritical]
set
{
if (value == null)
{
value = String.Empty;
}
using (SecureString securePassword = new SecureString())
{
#pragma warning suppress 6506 // value is set to String.Empty if it was null.
for (int i = 0; i < value.Length; i++)
{
securePassword.AppendChar(value[i]);
}
SetSecurePassword(securePassword);
}
}
}
///
/// Contents of the PasswordBox.
///
///
/// Reading the Password always returns a copy which may be safely
/// Disposed.
///
/// Setting the value always stores a copy of the supplied value.
///
///
/// Do not add public setter, see SetSecurePassword comments.
///
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public SecureString SecurePassword
{
get
{
return this.TextContainer.GetPasswordCopy();
}
}
///
/// The DependencyID for the PasswordChar property.
/// Default Value: '*'
///
public static readonly DependencyProperty PasswordCharProperty =
DependencyProperty.RegisterAttached(
"PasswordChar", // Property name
typeof(char), // Property type
typeof(PasswordBox), // Property owner
new FrameworkPropertyMetadata('*')); // Flags
///
/// Character to display instead of the actual password.
///
public char PasswordChar
{
get { return (char) GetValue(PasswordCharProperty); }
set { SetValue(PasswordCharProperty, value); }
}
///
/// The limit number of characters that the PasswordBox or other editable controls can contain.
/// if it is 0, means no-limitation.
/// User can set this value for some simple single line PasswordBox to restrict the text number.
/// By default it is 0.
///
///
/// When this property is set to zero, the maximum length of the text that can be entered
/// in the control is limited only by available memory. You can use this property to restrict
/// the length of text entered in the control for values such as postal codes and telephone numbers.
/// You can also use this property to restrict the length of text entered when the data is to be entered
/// in a database.
/// You can limit the text entered into the control to the maximum length of the corresponding field in the database.
/// Note: In code, you can set the value of the Text property to a value that is larger than
/// the value specified by the MaxLength property.
/// This property only affects text entered into the control at runtime.
///
public static readonly DependencyProperty MaxLengthProperty =
TextBox.MaxLengthProperty.AddOwner(typeof(PasswordBox));
///
/// Maximum number of characters the PasswordBox can accept
///
[DefaultValue((int)0)]
public int MaxLength
{
get { return (int) GetValue(MaxLengthProperty); }
set { SetValue(MaxLengthProperty, value); }
}
///
///
public static readonly DependencyProperty SelectionBrushProperty =
TextBoxBase.SelectionBrushProperty.AddOwner(typeof(PasswordBox));
///
///
public Brush SelectionBrush
{
get { return (Brush)GetValue(SelectionBrushProperty); }
set { SetValue(SelectionBrushProperty, value); }
}
///
///
public static readonly DependencyProperty SelectionOpacityProperty =
TextBoxBase.SelectionOpacityProperty.AddOwner(typeof(PasswordBox));
///
///
public double SelectionOpacity
{
get { return (double)GetValue(SelectionOpacityProperty); }
set { SetValue(SelectionOpacityProperty, value); }
}
///
///
public static readonly DependencyProperty CaretBrushProperty =
TextBoxBase.CaretBrushProperty.AddOwner(typeof(PasswordBox));
///
///
public Brush CaretBrush
{
get { return (Brush)GetValue(CaretBrushProperty); }
set { SetValue(CaretBrushProperty, value); }
}
#endregion Public Properties
//-----------------------------------------------------
//
// Public Events
//
//------------------------------------------------------
#region Public Events
///
/// Event for "Text has changed"
///
///
/// Unlike most RoutedEvents on Controls, PasswordChangedEvent does not
/// have a matching protected virtual OnPasswordChanged method --
/// because PasswordBox is sealed.
///
public static readonly RoutedEvent PasswordChangedEvent = EventManager.RegisterRoutedEvent(
"PasswordChanged", // Event name
RoutingStrategy.Bubble, //
typeof(RoutedEventHandler), //
typeof(PasswordBox)); //
///
/// Event fired from this text box when its inner content
/// has been changed.
///
///
/// It is redirected from inner TextContainer.Changed event.
///
public event RoutedEventHandler PasswordChanged
{
add
{
AddHandler(PasswordChangedEvent, value);
}
remove
{
RemoveHandler(PasswordChangedEvent, value);
}
}
#endregion Public Events
//-----------------------------------------------------
//
// Protected Methods
//
//-----------------------------------------------------
#region Protected Methods
internal override void ChangeVisualState(bool useTransitions)
{
if (!IsEnabled)
{
VisualStates.GoToState(this, useTransitions, VisualStates.StateDisabled, VisualStates.StateNormal);
}
else if (IsMouseOver)
{
VisualStates.GoToState(this, useTransitions, VisualStates.StateMouseOver, VisualStates.StateNormal);
}
else
{
VisualStateManager.GoToState(this, VisualStates.StateNormal, useTransitions);
}
if (IsKeyboardFocused)
{
VisualStates.GoToState(this, useTransitions, VisualStates.StateFocused, VisualStates.StateUnfocused);
}
else
{
VisualStateManager.GoToState(this, VisualStates.StateUnfocused, useTransitions);
}
base.ChangeVisualState(useTransitions);
}
///
/// Creates AutomationPeer (
protected override AutomationPeer OnCreateAutomationPeer()
{
return new PasswordBoxAutomationPeer(this);
}
///
/// Called when the Template's tree has been generated
///
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
AttachToVisualTree();
}
///
/// Template has changed
///
///
///
///
///
protected override void OnTemplateChanged(ControlTemplate oldTemplate, ControlTemplate newTemplate)
{
base.OnTemplateChanged(oldTemplate, newTemplate);
if (oldTemplate!=null && newTemplate!= null && oldTemplate.VisualTree != newTemplate.VisualTree)
{
DetachFromVisualTree();
}
}
///
///
/// Virtual method reporting a key was pressed
///
protected override void OnKeyDown(KeyEventArgs e)
{
base.OnKeyDown(e);
if (e.Handled)
{
return;
}
_textEditor.OnKeyDown(e);
}
///
/// Virtual method reporting a key was released
///
protected override void OnKeyUp(KeyEventArgs e)
{
base.OnKeyUp(e);
if (e.Handled)
{
return;
}
_textEditor.OnKeyUp(e);
}
///
/// Virtual method reporting text composition
///
protected override void OnTextInput(TextCompositionEventArgs e)
{
base.OnTextInput(e);
if (e.Handled)
{
return;
}
_textEditor.OnTextInput(e);
}
///
/// Virtual method reporting the mouse button was pressed
///
protected override void OnMouseDown(MouseButtonEventArgs e)
{
base.OnMouseDown(e);
if (e.Handled)
{
return;
}
_textEditor.OnMouseDown(e);
}
///
/// Virtual method reporting a mouse move
///
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
if (e.Handled)
{
return;
}
_textEditor.OnMouseMove(e);
}
///
/// Virtual method reporting the mouse button was released
///
protected override void OnMouseUp(MouseButtonEventArgs e)
{
base.OnMouseUp(e);
if (e.Handled)
{
return;
}
_textEditor.OnMouseUp(e);
}
///
/// Virtual method reporting the cursor to display was requested
///
protected override void OnQueryCursor(QueryCursorEventArgs e)
{
base.OnQueryCursor(e);
if (e.Handled)
{
return;
}
_textEditor.OnQueryCursor(e);
}
///
/// Virtual method reporting the query continue drag is going to happen
///
protected override void OnQueryContinueDrag(QueryContinueDragEventArgs e)
{
base.OnQueryContinueDrag(e);
if (e.Handled)
{
return;
}
_textEditor.OnQueryContinueDrag(e);
}
///
/// Virtual method reporting the give feedback is going to happen
///
protected override void OnGiveFeedback(GiveFeedbackEventArgs e)
{
base.OnGiveFeedback(e);
if (e.Handled)
{
return;
}
_textEditor.OnGiveFeedback(e);
}
///
/// Virtual method reporting the drag enter is going to happen
///
protected override void OnDragEnter(DragEventArgs e)
{
base.OnDragEnter(e);
if (e.Handled)
{
return;
}
_textEditor.OnDragEnter(e);
}
///
/// Virtual method reporting the drag over is going to happen
///
protected override void OnDragOver(DragEventArgs e)
{
base.OnDragOver(e);
if (e.Handled)
{
return;
}
_textEditor.OnDragOver(e);
}
///
/// Virtual method reporting the drag leave is going to happen
///
protected override void OnDragLeave(DragEventArgs e)
{
base.OnDragLeave(e);
if (e.Handled)
{
return;
}
_textEditor.OnDragLeave(e);
}
///
/// Virtual method reporting the drag enter is going to happen
///
protected override void OnDrop(DragEventArgs e)
{
base.OnDrop(e);
if (e.Handled)
{
return;
}
_textEditor.OnDrop(e);
}
///
/// Called when ContextMenuOpening is raised on this element.
///
/// Event arguments
protected override void OnContextMenuOpening(ContextMenuEventArgs e)
{
base.OnContextMenuOpening(e);
if (e.Handled)
{
return;
}
_textEditor.OnContextMenuOpening(e);
}
///
/// Virtual method reporting that the keyboard is focused on this element
///
protected override void OnGotKeyboardFocus(KeyboardFocusChangedEventArgs e)
{
base.OnGotKeyboardFocus(e);
if (e.Handled)
{
return;
}
_textEditor.OnGotKeyboardFocus(e);
}
///
/// Virtual method reporting that the keyboard is no longer focusekeyboard is no longer focuseed
///
protected override void OnLostKeyboardFocus(KeyboardFocusChangedEventArgs e)
{
base.OnLostKeyboardFocus(e);
if (e.Handled)
{
return;
}
_textEditor.OnLostKeyboardFocus(e);
}
///
/// This method is invoked when the IsFocused property changes to false
///
/// RoutedEventArgs
protected override void OnLostFocus(RoutedEventArgs e)
{
base.OnLostFocus(e);
if (e.Handled)
{
return;
}
_textEditor.OnLostFocus(e);
}
#endregion Protected Methods
//-----------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
#region Internal Properties
// A TextContainer covering the PasswordBox's inner content.
internal PasswordTextContainer TextContainer
{
get
{
return _textContainer;
}
}
///
/// readonly access to internal content control
///
internal FrameworkElement RenderScope
{
get
{
return _renderScope;
}
}
internal ScrollViewer ScrollViewer
{
get
{
if (_scrollViewer == null)
{
if (_textEditor != null)
{
_scrollViewer = _textEditor._Scroller as ScrollViewer;
}
}
return _scrollViewer;
}
}
// ITextContainer holding the Control content.
ITextContainer ITextBoxViewHost.TextContainer
{
get
{
return this.TextContainer;
}
}
// Set true when typography property values are all default values.
bool ITextBoxViewHost.IsTypographyDefaultValue
{
get
{
return true;
}
}
#endregion Internal Properties
//-----------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
#region Private Methods
// Worker for the ctors, initializes a new PasswordBox instance.
private void Initialize()
{
// Register static editing command handlers.
// This only has an effect that first time we make the call.
// We don't use the static ctor because there are cases
// where another control will want to alias our properties
// but doesn't need this overhead.
TextEditor.RegisterCommandHandlers(typeof(PasswordBox), /*acceptsRichContent:*/false, /*readOnly*/false, /*registerEventListeners*/false);
// Create TextContainer
InitializeTextContainer(new PasswordTextContainer(this));
// PasswordBox only accepts plain text, so change TextEditor's default to that.
_textEditor.AcceptsRichContent = false;
// PasswordBox does not accetps tabs.
_textEditor.AcceptsTab = false;
}
// Attaches this control to a new TextContainer.
private void InitializeTextContainer(PasswordTextContainer textContainer)
{
Invariant.Assert(textContainer != null);
// Uninitialize previous TextEditor
if (_textContainer != null)
{
Invariant.Assert(_textEditor != null);
Invariant.Assert(_textEditor.TextContainer == _textContainer);
// Detach existing editor from VisualTree
DetachFromVisualTree();
// Discard TextEditor - must release text container
_textEditor.OnDetach();
}
// Save text container
_textContainer = textContainer;
//
((ITextContainer)_textContainer).Changed += new TextContainerChangedEventHandler(OnTextContainerChanged);
// Create a text editor, initialize undo manager for it, and link it to text container
_textEditor = new TextEditor(_textContainer, this, true);
}
// Disable IME input unconditionally. We really can't support
// IMEs in this control, because PasswordTextContainer doesn't
// round-trip content, which breaks the cicero contract.
// Additionally, from a UI standpoint, we don't want to break
// user expectations by allowing IME input. IMEs do cool things
// like learn from user corrections, so the same keystroke sequence
// might produce different text over time.
private static object ForceToFalse(DependencyObject d, object value)
{
return BooleanBoxes.FalseBox;
}
///
/// Callback for changes to the PasswordChar property.
///
private static void OnPasswordCharChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
PasswordBox passwordBox = (PasswordBox)d;
// Force a layout refresh to display the new char.
if (passwordBox._renderScope != null)
{
passwordBox._renderScope.InvalidateMeasure();
}
}
///
/// Handler for text array change notifications.
///
///
/// sender
///
///
/// event args
///
private void OnTextContainerChanged(object sender, TextContainerChangedEventArgs e)
{
// If only properties on the text changed, don't fire a content change event.
// This can happen even in a plain text TextBox if we switch logical trees.
if (!e.HasContentAddedOrRemoved)
{
return;
}
RaiseEvent(new RoutedEventArgs(PasswordChangedEvent));
}
///
/// Walk the visual tree until we find a Text control with IsPasswordBoxContent == true
/// and a ScrollViewer
///
private void SetRenderScopeToContentHost(TextBoxView renderScope)
{
// Clear the content host from previous render scope (if any)
ClearContentHost();
// Find ContentHostTemplateName in the style
_passwordBoxContentHost = GetTemplateChild(ContentHostTemplateName) as FrameworkElement;
// Note that we allow ContentHostTemplateName to be optional.
// This simplifies toolability of our control styling.
// When the ContentHostTemplateName is not found or incorrect
// PasswordBox goes into disabled state, but does not throw.
// Add renderScope as a child of ContentHostTemplateName
_renderScope = renderScope;
if (_passwordBoxContentHost is ScrollViewer)
{
ScrollViewer scrollViewer = (ScrollViewer)_passwordBoxContentHost;
if (scrollViewer.Content != null)
{
throw new NotSupportedException(SR.Get(SRID.TextBoxScrollViewerMarkedAsTextBoxContentMustHaveNoContent));
}
else
{
scrollViewer.Content = _renderScope;
}
}
else if (_passwordBoxContentHost is Decorator)
{
Decorator decorator = (Decorator)_passwordBoxContentHost;
if (decorator.Child != null)
{
throw new NotSupportedException(SR.Get(SRID.TextBoxDecoratorMarkedAsTextBoxContentMustHaveNoContent));
}
else
{
decorator.Child = _renderScope; // this may replace old render scope in case of upgrade scenario in TextBox
}
}
else
{
// When we implement TextContainer setting via TextView interface
// all text containing element will become allowed here.
_renderScope = null;
// Explicitly not throwing an exception here when content host = null
// -- designers need us to support no content scenarios
if (_passwordBoxContentHost != null)
{
_passwordBoxContentHost = null;
//
throw new NotSupportedException(SR.Get(SRID.PasswordBoxInvalidTextContainer));
}
}
// Attach render scope to TextEditor
InitializeRenderScope();
FrameworkElement element = _renderScope;
while (element != this && element != null) // checking both just to be safe
{
if (element is Border)
{
_border = (Border)element;
}
element = element.Parent as FrameworkElement;
}
}
private void ClearContentHost()
{
// Detach render scope from TextEditor
UninitializeRenderScope();
// Render scope has been created by us,
// so we need to extract if from visual tree.
if (_passwordBoxContentHost is ScrollViewer)
{
((ScrollViewer)_passwordBoxContentHost).Content = null;
}
else if (_passwordBoxContentHost is Decorator)
{
((Decorator)_passwordBoxContentHost).Child = null;
}
else
{
Invariant.Assert(_passwordBoxContentHost == null, "_passwordBoxContentHost must be null here");
}
_passwordBoxContentHost = null;
}
// Initializes a new render scope.
private void InitializeRenderScope()
{
if (_renderScope == null)
{
return;
}
// Attach the renderScope to TextEditor as its ITextView member.
ITextView textview = TextEditor.GetTextView(_renderScope);
_textEditor.TextView = textview;
this.TextContainer.TextView = textview;
if (this.ScrollViewer != null)
{
this.ScrollViewer.CanContentScroll = true;
}
}
// Uninitializes a render scope and clears this control's reference.
private void UninitializeRenderScope()
{
// Clear TextView property in TextEditor
_textEditor.TextView = null;
}
// Resets the selection to the start of the content.
// Called after non-TOM changes to the content, like
// set_Text
private void ResetSelection()
{
Select(0, 0);
if (this.ScrollViewer != null)
{
this.ScrollViewer.ScrollToHome();
}
}
///
/// Select the text in the given position and length.
///
private void Select(int start, int length)
{
ITextPointer selectionStart;
ITextPointer selectionEnd;
// VerifyAccess();
if (start < 0)
{
throw new ArgumentOutOfRangeException("start", SR.Get(SRID.ParameterCannotBeNegative));
}
if (length < 0)
{
throw new ArgumentOutOfRangeException("length", SR.Get(SRID.ParameterCannotBeNegative));
}
// Identify new selection start position
selectionStart = this.TextContainer.Start.CreatePointer();
while (start-- > 0 && selectionStart.MoveToNextInsertionPosition(LogicalDirection.Forward))
{
}
// Identify new selection end position
selectionEnd = selectionStart.CreatePointer();
while (length-- > 0 && selectionEnd.MoveToNextInsertionPosition(LogicalDirection.Forward))
{
}
Selection.Select(selectionStart, selectionEnd);
}
///
/// Callback for TextBox.Padding property setting
///
///
/// TextBoxBase on which the property is changed
///
/// event args
private static void OnPaddingChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
PasswordBox passwordBox = (PasswordBox)d;
if (passwordBox.ScrollViewer != null)
{
// translate this change into inner property set on ScrollViewer
object padding = passwordBox.GetValue(Control.PaddingProperty);
if (padding is Thickness)
{
passwordBox.ScrollViewer.Padding = (Thickness)padding;
}
else
{
passwordBox.ScrollViewer.ClearValue(Control.PaddingProperty);
}
}
}
// Set up listener for Navigating event
private static void OnParentNavigationServiceChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
PasswordBox passwordBox = (PasswordBox)o;
NavigationService navService = NavigationService.GetNavigationService(o);
if (passwordBox._navigationService != null)
{
passwordBox._navigationService.Navigating -= new NavigatingCancelEventHandler(passwordBox.OnNavigating);
}
if (navService != null)
{
navService.Navigating += new NavigatingCancelEventHandler(passwordBox.OnNavigating);
passwordBox._navigationService = navService;
}
else
{
passwordBox._navigationService = null;
}
}
// Clear password on navigation to prevent journaling.
private void OnNavigating(Object sender, NavigatingCancelEventArgs e)
{
this.Password = String.Empty;
}
///
/// Detaches the editor from old visual tree and attaches it to a new one
///
private void AttachToVisualTree()
{
DetachFromVisualTree();
// Walk the visual tree to find our Text element
SetRenderScopeToContentHost(new TextBoxView(this));
// Attach scroll handler to the new scroll viewer
// Note that this.ScrollViewer will walk the tree from current TextEditor's render scope up to its ui scope.
if (this.ScrollViewer != null)
{
this.ScrollViewer.HorizontalScrollBarVisibility = ScrollBarVisibility.Hidden;
this.ScrollViewer.VerticalScrollBarVisibility = ScrollBarVisibility.Disabled;
this.ScrollViewer.Focusable = false;
if (this.ScrollViewer.Background == null)
{
// prevent hit-testing through padding
this.ScrollViewer.Background = Brushes.Transparent;
}
OnPaddingChanged(this, new DependencyPropertyChangedEventArgs());
}
// Set border properties
if (_border != null)
{
_border.Style = null;
}
}
///
/// Clear our layout-specific data, and detach our current renderScope from our text editor.
///
private void DetachFromVisualTree()
{
if (_textEditor != null)
{
_textEditor.Selection.DetachFromVisualTree();
}
// Invalidate our cached copy of scroll viewer.
_scrollViewer = null;
_border = null;
ClearContentHost();
}
///
/// Sets the content of the control.
///
///
/// Critical - This method indirectly reveals value's SecureString content.
///
/// This method must never be passed a publicly supplied SecureString as long as we expose
/// a plain text get_Password property.
///
/// 1. Attacker sets SecureString value it does not have permission to read.
/// 2. Attacker reads Password property.
/// --> attacker has ----ed open a SecureString without UnmanagedCode permission.
///
[SecurityCritical]
private void SetSecurePassword(SecureString value)
{
this.TextContainer.BeginChange();
try
{
this.TextContainer.SetPassword(value);
this.ResetSelection();
}
finally
{
this.TextContainer.EndChange();
}
}
///
/// PropertyChanged callback for a property that affects the selection or caret rendering.
///
private static void UpdateCaretElement(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
PasswordBox passwordBox = (PasswordBox)d;
if (passwordBox.Selection != null)
{
CaretElement caretElement = passwordBox.Selection.CaretElement;
if (caretElement != null)
{
if (e.Property == CaretBrushProperty)
{
caretElement.UpdateCaretBrush(TextSelection.GetCaretBrush(passwordBox.Selection.TextEditor));
}
caretElement.InvalidateVisual();
}
}
}
#endregion Private methods
//------------------------------------------------------
//
// Private Properties
//
//-----------------------------------------------------
#region Private Properties
///
/// Text Selection (readonly)
///
private ITextSelection Selection
{
get
{
return _textEditor.Selection;
}
}
#endregion Private Properties
//------------------------------------------------------
//
// Private Fields
//
//-----------------------------------------------------
#region Private Fields
// TextEditor working in this control instance
private TextEditor _textEditor;
// Backing store for the control's content.
private PasswordTextContainer _textContainer;
// Encapsulated control that renders our TextContainer.
private TextBoxView _renderScope;
// ScrollViewer
private ScrollViewer _scrollViewer;
// Border
private Border _border;
// An element marked as ContentHostTemplateName which we assign our _renderScope as a child.
private FrameworkElement _passwordBoxContentHost;
// Default size for the control.
private const int _defaultWidth = 100;
private const int _defaultHeight = 20;
// Part name used in the style. The class TemplatePartAttribute should use the same name
private const string ContentHostTemplateName = "PART_ContentHost";
#endregion Private Fields
#region DTypeThemeStyleKey
// Returns the DependencyObjectType for the registered ThemeStyleKey's default
// value. Controls will override this method to return approriate types.
internal override DependencyObjectType DTypeThemeStyleKey
{
get { return _dType; }
}
private static DependencyObjectType _dType;
private NavigationService _navigationService;
#endregion DTypeThemeStyleKey
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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