FocusManager.cs source code in C# .NET

                        
Code:
                         / Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Core / CSharp / System / Windows / Input / FocusManager.cs / 1 / FocusManager.cs
                        

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

using System; 
using System.Collections; 
using System.Collections.Generic;
using System.Collections.ObjectModel; 
using System.ComponentModel;
using System.Diagnostics;
using System.Windows.Threading;
using System.Threading; 
using System.Windows;
using System.Windows.Interop; 
using System.Windows.Media; 
using System.Windows.Media.Media3D;
using System.Security.Permissions; 
using MS.Internal.KnownBoxes;


namespace System.Windows.Input 
{
    /// 
 
    ///   FocusManager define attached property used for tracking the FocusedElement with a focus scope 
    /// 
    public static class FocusManager 
    {
        #region Public Events

        /// 
 
        ///     GotFocus event
        /// 
 
        public static readonly RoutedEvent GotFocusEvent = EventManager.RegisterRoutedEvent("GotFocus", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(FocusManager)); 

        /// 
 
        ///     LostFocus event
        /// 
        public static readonly RoutedEvent LostFocusEvent = EventManager.RegisterRoutedEvent("LostFocus", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(FocusManager));
 
        #endregion Public Events
 
        #region Public Properties 

        #region FocusedElement property 

        /// 

        /// The DependencyProperty for the FocusedElement property. This internal property tracks IsActive
        /// element ref inside TrackFocus 
        /// Default Value:      null
        /// 
 
        public static readonly DependencyProperty FocusedElementProperty = 
                DependencyProperty.RegisterAttached(
                        "FocusedElement", 
                        typeof(IInputElement),
                        typeof(FocusManager),
                        new PropertyMetadata(new PropertyChangedCallback(OnFocusedElementChanged)));
 
        #endregion FocusedElement property
 
        #region IsFocusScope Property 
        /// 

        ///     The DependencyProperty for the IsFocusScope property. 
        /// This property is used to mark the special containers (like Window, Menu) so they can
        /// keep track of the FocusedElement element inside the container. Once focus is set
        /// on the container - it is delegated to the FocusedElement element
        ///     Default Value:      false 
        /// 
        public static readonly DependencyProperty IsFocusScopeProperty 
            = DependencyProperty.RegisterAttached("IsFocusScope", typeof(bool), typeof(FocusManager), 
                                                        new PropertyMetadata(BooleanBoxes.FalseBox));
 
        #endregion IsFocusScope Property

        #endregion
 
        #region Public static methods
 
        /// 
 
        /// Return the property value of FocusedElement property. The return value is validated
        /// to be in the subtree of element. If FocusedElement element is not a descendant of element this method return null 
        /// 
        /// 
        /// 
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 
        public static IInputElement GetFocusedElement(DependencyObject element)
        { 
            if (element == null) 
            {
                throw new ArgumentNullException("element"); 
            }

            return (IInputElement) element.GetValue(FocusedElementProperty);
        } 

        /// 
 
        ///     Set FocusedElement property for element. 
        /// 
        ///  
        /// 
        public static void SetFocusedElement(DependencyObject element, IInputElement value)
        {
            if (element == null) 
            {
                throw new ArgumentNullException("element"); 
            } 

            element.SetValue(FocusedElementProperty, value); 
        }

        /// 

        /// Writes the attached property IsFocusScope to the given element. 
        /// 
        /// The element to which to write the attached property. 
        /// The property value to set 
        public static void SetIsFocusScope(DependencyObject element, bool value)
        { 
            if (element == null)
            {
                throw new ArgumentNullException("element");
            } 
            element.SetValue(IsFocusScopeProperty, value);
        } 
 
        /// 

        /// Reads the attached property IsFocusScope from the given element. 
        /// 
        /// The element from which to read the attached property.
        /// The property's value.
        public static bool GetIsFocusScope(DependencyObject element) 
        {
            if (element == null) 
            { 
                throw new ArgumentNullException("element");
            } 
            return (bool)element.GetValue(IsFocusScopeProperty);
        }

        /// 
 
        /// Find the closest visual ancestor that has IsFocusScope set to true
        /// 
 
        ///  
        /// 
        public static DependencyObject GetFocusScope(DependencyObject element) 
        {
            if (element == null)
            {
                throw new ArgumentNullException("element"); 
            }
            return _GetFocusScope(element); 
        } 

        #endregion Public methods 

        #region private implementation
//
 

        private static void OnFocusedElementChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) 
        { 
            IInputElement newFocusedElement = (IInputElement) e.NewValue;
            DependencyObject oldVisual = (DependencyObject) e.OldValue; 
            DependencyObject newVisual = (DependencyObject) e.NewValue;

            if (oldVisual != null)
            { 
                oldVisual.ClearValue(UIElement.IsFocusedPropertyKey);
            } 
 
            if (newVisual != null)
            { 
                // set IsFocused on the element.  The element may redirect Keyboard focus
                // in response to this (e.g. Editable ComboBox redirects to the
                // child TextBox), so detect whether this happens.
                DependencyObject oldFocus = Keyboard.FocusedElement as DependencyObject; 
                newVisual.SetValue(UIElement.IsFocusedPropertyKey, BooleanBoxes.TrueBox);
                DependencyObject newFocus = Keyboard.FocusedElement as DependencyObject; 
 
                // set the Keyboard focus to the new element, provided that
                //  a) the element didn't already set Keyboard focus 
                //  b) Keyboard focus is not already on the new element
                //  c) the new element is within the same focus scope as the current
                //      holder (if any) of Keyboard focus
                if (oldFocus == newFocus && newVisual != newFocus && 
                        (newFocus == null || GetRoot(newVisual) == GetRoot(newFocus)))
                { 
                    Keyboard.Focus(newFocusedElement); 
                }
            } 
/*
            if (!_currentlyUpdatingTree)
            {
                _currentlyUpdatingTree = true; 

                IInputElement newFocusedElement = (IInputElement) newValue; 
                Visual oldVisual = GetNearestVisual(args.OldValue); 
                Visual newVisual = GetNearestVisual(args.NewValue);
 
                if (oldVisual != null)
                {
                    oldVisual.ClearValue(UIElement.IsFocusedPropertyKey);
 
                    // reverse-inherit:  clear the property on all parents that aren't also in the
                    // new focused element ancestry 
                    while (oldVisual != null) 
                    {
                        oldVisual.ClearValue(FocusedElementProperty); 
                        oldVisual = VisualTreeHelper.GetParent(oldVisual);
                        if ((oldVisual == newVisual) || oldVisual.IsAncestorOf(newVisual))
                        {
                            // only walk up until you reach a common parent -- the new value walk will take care of the rest 
                            break;
                        } 
                    } 
                }
 
                if (newVisual != null)
                {
                    newVisual.SetValue(UIElement.IsFocusedPropertyKey, BooleanBoxes.TrueBox);
 
                    // reverse-inherit:  set the property on all parents
                    while (newVisual != null) 
                    { 
                        newVisual.SetValue(FocusedElementProperty, newFocusedElement);
                        newVisual = VisualTreeHelper.GetParent(newVisual); 
                    }

                    // Set Keyboard focus to the element if not already focused && current focus is within the current focus scope
                    DependencyObject currentFocus = Keyboard.FocusedElement as DependencyObject; 
                    if ((currentFocus == null) &&
                        (newVisual != currentFocus) && 
                        (GetRoot(newVisual) == GetRoot(currentFocus))) 
                    {
                        Keyboard.Focus(newFocusedElement); 
                    }
                }
                _currentlyUpdatingTree = false;
            } 
*/
        } 
 
/*
        private static Visual GetNearestVisual(object value) 
        {
            Visual visual = null;
            if (value != null)
            { 
                visual = value as Visual;
                if (visual == null) 
                { 
                    ContentElement ce = value as ContentElement;
                    if (ce != null) 
                    {
                        visual = ce.GetUIParent() as Visual;
                    }
                } 
            }
            return visual; 
        } 
*/
 
        private static DependencyObject GetRoot(DependencyObject element)
        {
            if (element == null)
                return null; 

            DependencyObject parent = null; 
            DependencyObject dependencyObject = element; 

            ContentElement ce = element as ContentElement; 
            if (ce != null)
                dependencyObject = ce.GetUIParent();

            while (dependencyObject != null) 
            {
                parent = dependencyObject; 
                dependencyObject = VisualTreeHelper.GetParent(dependencyObject); 
            }
 
            return parent;
        }

        // Walk up the parent chain to find the closest element with IsFocusScope=true 
        private static DependencyObject _GetFocusScope(DependencyObject d)
        { 
            if (d == null) 
                return null;
 
            if ((bool)d.GetValue(IsFocusScopeProperty))
                return d;

            // Step 1: Walk up the logical tree 
            UIElement uiElement = d as UIElement;
            if (uiElement != null) 
            { 
                DependencyObject logicalParent = uiElement.GetUIParentCore();
                if (logicalParent != null) 
                {
                    return GetFocusScope(logicalParent);
                }
            } 
            else
            { 
                ContentElement ce = d as ContentElement; 
                if (ce != null)
                { 
                    DependencyObject logicalParent = ce.GetUIParent(true);
                    if (logicalParent != null)
                    {
                        return _GetFocusScope(logicalParent); 
                    }
                } 
                else 
                {
                    UIElement3D uiElement3D = d as UIElement3D; 
                    if (uiElement3D != null)
                    {
                        DependencyObject logicalParent = uiElement3D.GetUIParentCore();
                        if (logicalParent != null) 
                        {
                            return GetFocusScope(logicalParent); 
                        } 
                    }
                } 
            }

            // Step 2: Walk up the visual tree
            if (d is Visual || d is Visual3D) 
            {
                DependencyObject visualParent = VisualTreeHelper.GetParent(d); 
                if (visualParent != null) 
                {
                    return _GetFocusScope(visualParent); 
                }
            }

            // If visual and logical parent is null - then the element is implicit focus scope 
            return d;
        } 
        #endregion private implementation 

        #region private data 

        private static readonly UncommonField IsFocusedElementSet = new UncommonField();
        private static readonly UncommonField FocusedElementWeakCacheField = new UncommonField();
        private static readonly UncommonField IsFocusedElementCacheValid = new UncommonField(); 
        private static readonly UncommonField FocusedElementCache = new UncommonField();
//        private static bool _currentlyUpdatingTree = false; 
 
        #endregion private data
    } 
}


// 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.Collections; 
using System.Collections.Generic;
using System.Collections.ObjectModel; 
using System.ComponentModel;
using System.Diagnostics;
using System.Windows.Threading;
using System.Threading; 
using System.Windows;
using System.Windows.Interop; 
using System.Windows.Media; 
using System.Windows.Media.Media3D;
using System.Security.Permissions; 
using MS.Internal.KnownBoxes;


namespace System.Windows.Input 
{
    /// 
 
    ///   FocusManager define attached property used for tracking the FocusedElement with a focus scope 
    /// 
    public static class FocusManager 
    {
        #region Public Events

        /// 
 
        ///     GotFocus event
        /// 
 
        public static readonly RoutedEvent GotFocusEvent = EventManager.RegisterRoutedEvent("GotFocus", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(FocusManager)); 

        /// 
 
        ///     LostFocus event
        /// 
        public static readonly RoutedEvent LostFocusEvent = EventManager.RegisterRoutedEvent("LostFocus", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(FocusManager));
 
        #endregion Public Events
 
        #region Public Properties 

        #region FocusedElement property 

        /// 

        /// The DependencyProperty for the FocusedElement property. This internal property tracks IsActive
        /// element ref inside TrackFocus 
        /// Default Value:      null
        /// 
 
        public static readonly DependencyProperty FocusedElementProperty = 
                DependencyProperty.RegisterAttached(
                        "FocusedElement", 
                        typeof(IInputElement),
                        typeof(FocusManager),
                        new PropertyMetadata(new PropertyChangedCallback(OnFocusedElementChanged)));
 
        #endregion FocusedElement property
 
        #region IsFocusScope Property 
        /// 

        ///     The DependencyProperty for the IsFocusScope property. 
        /// This property is used to mark the special containers (like Window, Menu) so they can
        /// keep track of the FocusedElement element inside the container. Once focus is set
        /// on the container - it is delegated to the FocusedElement element
        ///     Default Value:      false 
        /// 
        public static readonly DependencyProperty IsFocusScopeProperty 
            = DependencyProperty.RegisterAttached("IsFocusScope", typeof(bool), typeof(FocusManager), 
                                                        new PropertyMetadata(BooleanBoxes.FalseBox));
 
        #endregion IsFocusScope Property

        #endregion
 
        #region Public static methods
 
        /// 
 
        /// Return the property value of FocusedElement property. The return value is validated
        /// to be in the subtree of element. If FocusedElement element is not a descendant of element this method return null 
        /// 
        /// 
        /// 
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 
        public static IInputElement GetFocusedElement(DependencyObject element)
        { 
            if (element == null) 
            {
                throw new ArgumentNullException("element"); 
            }

            return (IInputElement) element.GetValue(FocusedElementProperty);
        } 

        /// 
 
        ///     Set FocusedElement property for element. 
        /// 
        ///  
        /// 
        public static void SetFocusedElement(DependencyObject element, IInputElement value)
        {
            if (element == null) 
            {
                throw new ArgumentNullException("element"); 
            } 

            element.SetValue(FocusedElementProperty, value); 
        }

        /// 

        /// Writes the attached property IsFocusScope to the given element. 
        /// 
        /// The element to which to write the attached property. 
        /// The property value to set 
        public static void SetIsFocusScope(DependencyObject element, bool value)
        { 
            if (element == null)
            {
                throw new ArgumentNullException("element");
            } 
            element.SetValue(IsFocusScopeProperty, value);
        } 
 
        /// 

        /// Reads the attached property IsFocusScope from the given element. 
        /// 
        /// The element from which to read the attached property.
        /// The property's value.
        public static bool GetIsFocusScope(DependencyObject element) 
        {
            if (element == null) 
            { 
                throw new ArgumentNullException("element");
            } 
            return (bool)element.GetValue(IsFocusScopeProperty);
        }

        /// 
 
        /// Find the closest visual ancestor that has IsFocusScope set to true
        /// 
 
        ///  
        /// 
        public static DependencyObject GetFocusScope(DependencyObject element) 
        {
            if (element == null)
            {
                throw new ArgumentNullException("element"); 
            }
            return _GetFocusScope(element); 
        } 

        #endregion Public methods 

        #region private implementation
//
 

        private static void OnFocusedElementChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) 
        { 
            IInputElement newFocusedElement = (IInputElement) e.NewValue;
            DependencyObject oldVisual = (DependencyObject) e.OldValue; 
            DependencyObject newVisual = (DependencyObject) e.NewValue;

            if (oldVisual != null)
            { 
                oldVisual.ClearValue(UIElement.IsFocusedPropertyKey);
            } 
 
            if (newVisual != null)
            { 
                // set IsFocused on the element.  The element may redirect Keyboard focus
                // in response to this (e.g. Editable ComboBox redirects to the
                // child TextBox), so detect whether this happens.
                DependencyObject oldFocus = Keyboard.FocusedElement as DependencyObject; 
                newVisual.SetValue(UIElement.IsFocusedPropertyKey, BooleanBoxes.TrueBox);
                DependencyObject newFocus = Keyboard.FocusedElement as DependencyObject; 
 
                // set the Keyboard focus to the new element, provided that
                //  a) the element didn't already set Keyboard focus 
                //  b) Keyboard focus is not already on the new element
                //  c) the new element is within the same focus scope as the current
                //      holder (if any) of Keyboard focus
                if (oldFocus == newFocus && newVisual != newFocus && 
                        (newFocus == null || GetRoot(newVisual) == GetRoot(newFocus)))
                { 
                    Keyboard.Focus(newFocusedElement); 
                }
            } 
/*
            if (!_currentlyUpdatingTree)
            {
                _currentlyUpdatingTree = true; 

                IInputElement newFocusedElement = (IInputElement) newValue; 
                Visual oldVisual = GetNearestVisual(args.OldValue); 
                Visual newVisual = GetNearestVisual(args.NewValue);
 
                if (oldVisual != null)
                {
                    oldVisual.ClearValue(UIElement.IsFocusedPropertyKey);
 
                    // reverse-inherit:  clear the property on all parents that aren't also in the
                    // new focused element ancestry 
                    while (oldVisual != null) 
                    {
                        oldVisual.ClearValue(FocusedElementProperty); 
                        oldVisual = VisualTreeHelper.GetParent(oldVisual);
                        if ((oldVisual == newVisual) || oldVisual.IsAncestorOf(newVisual))
                        {
                            // only walk up until you reach a common parent -- the new value walk will take care of the rest 
                            break;
                        } 
                    } 
                }
 
                if (newVisual != null)
                {
                    newVisual.SetValue(UIElement.IsFocusedPropertyKey, BooleanBoxes.TrueBox);
 
                    // reverse-inherit:  set the property on all parents
                    while (newVisual != null) 
                    { 
                        newVisual.SetValue(FocusedElementProperty, newFocusedElement);
                        newVisual = VisualTreeHelper.GetParent(newVisual); 
                    }

                    // Set Keyboard focus to the element if not already focused && current focus is within the current focus scope
                    DependencyObject currentFocus = Keyboard.FocusedElement as DependencyObject; 
                    if ((currentFocus == null) &&
                        (newVisual != currentFocus) && 
                        (GetRoot(newVisual) == GetRoot(currentFocus))) 
                    {
                        Keyboard.Focus(newFocusedElement); 
                    }
                }
                _currentlyUpdatingTree = false;
            } 
*/
        } 
 
/*
        private static Visual GetNearestVisual(object value) 
        {
            Visual visual = null;
            if (value != null)
            { 
                visual = value as Visual;
                if (visual == null) 
                { 
                    ContentElement ce = value as ContentElement;
                    if (ce != null) 
                    {
                        visual = ce.GetUIParent() as Visual;
                    }
                } 
            }
            return visual; 
        } 
*/
 
        private static DependencyObject GetRoot(DependencyObject element)
        {
            if (element == null)
                return null; 

            DependencyObject parent = null; 
            DependencyObject dependencyObject = element; 

            ContentElement ce = element as ContentElement; 
            if (ce != null)
                dependencyObject = ce.GetUIParent();

            while (dependencyObject != null) 
            {
                parent = dependencyObject; 
                dependencyObject = VisualTreeHelper.GetParent(dependencyObject); 
            }
 
            return parent;
        }

        // Walk up the parent chain to find the closest element with IsFocusScope=true 
        private static DependencyObject _GetFocusScope(DependencyObject d)
        { 
            if (d == null) 
                return null;
 
            if ((bool)d.GetValue(IsFocusScopeProperty))
                return d;

            // Step 1: Walk up the logical tree 
            UIElement uiElement = d as UIElement;
            if (uiElement != null) 
            { 
                DependencyObject logicalParent = uiElement.GetUIParentCore();
                if (logicalParent != null) 
                {
                    return GetFocusScope(logicalParent);
                }
            } 
            else
            { 
                ContentElement ce = d as ContentElement; 
                if (ce != null)
                { 
                    DependencyObject logicalParent = ce.GetUIParent(true);
                    if (logicalParent != null)
                    {
                        return _GetFocusScope(logicalParent); 
                    }
                } 
                else 
                {
                    UIElement3D uiElement3D = d as UIElement3D; 
                    if (uiElement3D != null)
                    {
                        DependencyObject logicalParent = uiElement3D.GetUIParentCore();
                        if (logicalParent != null) 
                        {
                            return GetFocusScope(logicalParent); 
                        } 
                    }
                } 
            }

            // Step 2: Walk up the visual tree
            if (d is Visual || d is Visual3D) 
            {
                DependencyObject visualParent = VisualTreeHelper.GetParent(d); 
                if (visualParent != null) 
                {
                    return _GetFocusScope(visualParent); 
                }
            }

            // If visual and logical parent is null - then the element is implicit focus scope 
            return d;
        } 
        #endregion private implementation 

        #region private data 

        private static readonly UncommonField IsFocusedElementSet = new UncommonField();
        private static readonly UncommonField FocusedElementWeakCacheField = new UncommonField();
        private static readonly UncommonField IsFocusedElementCacheValid = new UncommonField(); 
        private static readonly UncommonField FocusedElementCache = new UncommonField();
//        private static bool _currentlyUpdatingTree = false; 
 
        #endregion private data
    } 
}


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

                        

                        

                        
                        

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