UIElementHelper.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 / UIElementHelper.cs / 3 / UIElementHelper.cs
                        

                        
                            using System.Diagnostics; 
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Media3D;
using System.Windows.Input; 

using MS.Internal.PresentationCore; 
 
namespace MS.Internal
{ 
    internal static class UIElementHelper
    {
        [FriendAccessAllowed]
        internal static bool IsHitTestVisible(DependencyObject o) 
        {
            Debug.Assert(o != null, "UIElementHelper.IsHitTestVisible called with null argument"); 
 
            UIElement oAsUIElement = o as UIElement;
            if (oAsUIElement != null) 
            {
                return oAsUIElement.IsHitTestVisible;
            }
            else 
            {
                return ((UIElement3D)o).IsHitTestVisible; 
            } 
        }
 
        [FriendAccessAllowed]
        internal static bool IsVisible(DependencyObject o)
        {
            Debug.Assert(o != null, "UIElementHelper.IsVisible called with null argument"); 

            UIElement oAsUIElement = o as UIElement; 
            if (oAsUIElement != null) 
            {
                return oAsUIElement.IsVisible; 
            }
            else
            {
                return ((UIElement3D)o).IsVisible; 
            }
        } 
 
        [FriendAccessAllowed]
        internal static DependencyObject PredictFocus(DependencyObject o, FocusNavigationDirection direction) 
        {
            Debug.Assert(o != null, "UIElementHelper.PredictFocus called with null argument");

            UIElement oAsUIElement = o as UIElement; 
            if (oAsUIElement != null)
            { 
                return oAsUIElement.PredictFocus(direction); 
            }
            else 
            {
                return ((UIElement3D)o).PredictFocus(direction);
            }
        } 

        [FriendAccessAllowed] 
        internal static UIElement GetContainingUIElement2D(DependencyObject reference) 
        {
            UIElement element = null; 

            while (reference != null)
            {
                element = reference as UIElement; 

                if (element != null) break; 
 
                reference = VisualTreeHelper.GetParent(reference);
            } 

            return element;
        }
 
        [FriendAccessAllowed]
        internal static DependencyObject GetUIParent(DependencyObject child) 
        { 
            DependencyObject parent = GetUIParent(child, false);
 
            return parent;
        }

        [FriendAccessAllowed] 
        internal static DependencyObject GetUIParent(DependencyObject child, bool continuePastVisualTree)
        { 
            DependencyObject parent = null; 
            DependencyObject myParent = null;
 
            // Try to find a UIElement parent in the visual ancestry.
            if (child is Visual)
            {
                myParent = ((Visual)child).InternalVisualParent; 
            }
            else 
            { 
                myParent = ((Visual3D)child).InternalVisualParent;
            } 

            parent = InputElement.GetContainingUIElement(myParent) as DependencyObject;

            // If there was no UIElement parent in the visual ancestry, 
            // check along the logical branch.
            if(parent == null && continuePastVisualTree) 
            { 
                UIElement childAsUIElement = child as UIElement;
                if (childAsUIElement != null) 
                {
                    parent = InputElement.GetContainingInputElement(childAsUIElement.GetUIParentCore()) as DependencyObject;
                }
                else 
                {
                    UIElement3D childAsUIElement3D = child as UIElement3D; 
                    if (childAsUIElement3D != null) 
                    {
                        parent = InputElement.GetContainingInputElement(childAsUIElement3D.GetUIParentCore()) as DependencyObject; 
                    }
                }
            }
 
            return parent;
        } 
 
        [FriendAccessAllowed]
        internal static bool IsUIElementOrUIElement3D(DependencyObject o) 
        {
            return (o is UIElement || o is UIElement3D);
        }
    } 
}

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

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