DeferredElementTreeState.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / MS / Internal / DeferredElementTreeState.cs / 2 / DeferredElementTreeState.cs
                        

                        
                            using System.Windows; 
using System.Collections.Generic;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Media3D; 

namespace MS.Internal 
{ 
    internal class DeferredElementTreeState
    { 
        public void SetCoreParent(DependencyObject element, DependencyObject parent)
        {
            if(!_oldCoreParents.ContainsKey(element))
            { 
                _oldCoreParents[element] = parent;
            } 
        } 

        public static DependencyObject GetCoreParent(DependencyObject element, DeferredElementTreeState treeState) 
        {
            DependencyObject parent = null;

            if(treeState != null && treeState._oldCoreParents.ContainsKey(element)) 
            {
                parent = treeState._oldCoreParents[element]; 
            } 
            else
            { 
                Visual v = element as Visual;
                if(v != null)
                {
                    parent = VisualTreeHelper.GetParent(v); 
                }
                else 
                { 
                    ContentElement ce = element as ContentElement;
                    if(ce != null) 
                    {
                        parent = ContentOperations.GetParent(ce);
                    }
                    else 
                    {
                        Visual3D v3D = element as Visual3D; 
                        if (v3D != null) 
                        {
                            parent = VisualTreeHelper.GetParent(v3D); 
                        }
                    }

                }
            } 

            return parent; 
        } 

        public static DependencyObject GetInputElementParent(DependencyObject element, DeferredElementTreeState treeState) 
        {
            DependencyObject parent = element;

            while (true) 
            {
                parent = GetCoreParent(parent, treeState); 
 
                if (parent == null || InputElement.IsValid(parent))
                { 
                    break;
                }
            }
 
            return parent;
        } 
 
        public void SetLogicalParent(DependencyObject element, DependencyObject parent)
        { 
            if(!_oldLogicalParents.ContainsKey(element))
            {
                _oldLogicalParents[element] = parent;
            } 
        }
 
        public static DependencyObject GetLogicalParent(DependencyObject element, DeferredElementTreeState treeState) 
        {
            DependencyObject parent = null; 

            if(treeState != null && treeState._oldLogicalParents.ContainsKey(element))
            {
                parent = treeState._oldLogicalParents[element]; 
            }
            else 
            { 
                UIElement e = element as UIElement;
                if(e != null) 
                {
                    parent = e.GetUIParentCore();  // Overriden by FrameworkElement.
                }
 
                ContentElement ce = element as ContentElement;
                if(ce != null) 
                { 
                    parent = ce.GetUIParentCore(); // Overriden by FrameworkContentElement.
                } 
            }

            return parent;
        } 

        public void Clear() 
        { 
            _oldCoreParents.Clear();
            _oldLogicalParents.Clear(); 
        }

        public bool IsEmpty
        { 
            get
            { 
                return _oldCoreParents.Count > 0 || _oldLogicalParents.Count > 0; 
            }
        } 

        private Dictionary _oldCoreParents = new Dictionary();
        private Dictionary _oldLogicalParents = new Dictionary();
    } 
}
 

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

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