diff --git a/src/Microsoft.DotNet.Wpf/src/PresentationCore/MS/internal/Automation/ElementUtil.cs b/src/Microsoft.DotNet.Wpf/src/PresentationCore/MS/internal/Automation/ElementUtil.cs
index 3b68366f21c..45d0850e8bf 100644
--- a/src/Microsoft.DotNet.Wpf/src/PresentationCore/MS/internal/Automation/ElementUtil.cs
+++ b/src/Microsoft.DotNet.Wpf/src/PresentationCore/MS/internal/Automation/ElementUtil.cs
@@ -1,316 +1,75 @@
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
-using System.Windows.Threading;
-using System.Windows;
-using System.Windows.Interop;
-using System.Windows.Media;
-using System.Windows.Automation;
using System.Windows.Automation.Peers;
-using MS.Win32;
-using MS.Internal.Media;
-using System.Runtime.InteropServices;
+using System.Windows.Automation;
+using System.Windows.Threading;
-using MS.Internal.PresentationCore;
+namespace MS.Internal.Automation;
-namespace MS.Internal.Automation
+/// <summary>
+/// Utility class for working with <see cref="AutomationPeer"/>.
+/// </summary>
+internal static class ElementUtil
{
- // static class providing utility information for working with WCP elements
- internal class ElementUtil
+ /// <summary>
+ /// Provides a helper to invoke work on the UI thread, re-throwing all exceptions on the thread that invoked this execution.
+ /// </summary>
+ internal static object Invoke(AutomationPeer peer, DispatcherOperationCallback work, object arg)
{
- //------------------------------------------------------
- //
- // Constructors
- //
- //------------------------------------------------------
-
- #region Constructors
-
- // static class, so use private ctor
- private ElementUtil() { }
-
- #endregion Constructors
-
-
- //------------------------------------------------------
- //
- // Internal Methods
- //
- //------------------------------------------------------
-
- #region Internal Methods
-
- internal static Visual GetParent( Visual el )
- {
- return VisualTreeHelper.GetParent(el) as Visual;
- }
-
- internal static Visual GetFirstChild( Visual el )
- {
- if (el == null)
- {
- return null;
- }
-
- return FindVisibleSibling ( el, 0, true );
- }
-
- internal static Visual GetLastChild( Visual el )
- {
- if (el == null)
- {
- return null;
- }
-
- return FindVisibleSibling ( el, el.InternalVisualChildrenCount - 1, false );
- }
-
- // Warning: Method is O(N). See FindVisibleSibling function for more information.
- internal static Visual GetNextSibling( Visual el )
- {
- // To get next/previous sibling, have to find out where we
- // are in our parent's children collection (ie. our siblings)
- Visual parent = VisualTreeHelper.GetParent(el) as Visual;
- // If parent is null, we're at root, so have no siblings
- if (parent == null)
- {
- return null;
- }
- return FindVisibleSibling ( parent, el, searchForwards: true);
- }
-
- // Warning: Method is O(N). See FindVisibleSibling function for more information.
- internal static Visual GetPreviousSibling( Visual el )
- {
- // To get next/previous sibling, have to find out where we
- // are in our parent's children collection (ie. our siblings)
- Visual parent = VisualTreeHelper.GetParent(el) as Visual;
- // If parent is null, we're at root, so have no siblings
- if (parent == null)
- {
- return null;
- }
-
- return FindVisibleSibling ( parent, el, searchForwards: false);
- }
-
- internal static Visual GetRoot( Visual el )
- {
- // Keep moving up parent chain till we reach the top...
- Visual scan = el;
- for( ; ; )
- {
- Visual test = VisualTreeHelper.GetParent(scan) as Visual;
- if( test == null )
- break;
- scan = test;
- }
- return scan;
- }
-
- // Get bounding rectangle, in coords relative to root (not screen)
- internal static Rect GetLocalRect( UIElement element )
- {
- // Get top-most visual.
- Visual parent = GetRoot( element );
-
- // Get the points for the rectangle and transform them.
- double height = element.RenderSize.Height;
- double width = element.RenderSize.Width;
- Rect rect = new Rect(0, 0, width, height);
-
- GeneralTransform g = element.TransformToAncestor(parent);
- return g.TransformBounds(rect);
- }
-
- // Get bounding rectangle, relative to screen
- internal static Rect GetScreenRect( IntPtr hwnd, UIElement el )
- {
- Rect rc = GetLocalRect( el );
-
- // Map from local to screen coords...
- NativeMethods.RECT rcWin32 = new NativeMethods.RECT( (int) rc.Left, (int) rc.Top, (int) rc.Right, (int) rc.Bottom );
- try
- {
- SafeSecurityHelper.TransformLocalRectToScreen(new HandleRef(null, hwnd), ref rcWin32);
- }
- catch (System.ComponentModel.Win32Exception)
- {
- return Rect.Empty;
- }
-
- rc = new Rect( rcWin32.left, rcWin32.top, rcWin32.right - rcWin32.left, rcWin32.bottom - rcWin32.top );
-
- return rc;
- }
+ // Null dispatcher likely means the visual is in bad shape
+ Dispatcher dispatcher = peer.Dispatcher ?? throw new ElementNotAvailableException();
- // Get element at given point (screen coords)
- internal static Visual GetElementFromPoint( IntPtr hwnd, Visual root, Point pointScreen )
- {
- HwndSource hwndSource = HwndSource.CriticalFromHwnd(hwnd);
-
- if(hwndSource == null)
- return null;
-
- Point pointClient = PointUtil.ScreenToClient( pointScreen, hwndSource );
- Point pointRoot = PointUtil.ClientToRoot(pointClient, hwndSource);
- PointHitTestResult result = VisualTreeUtils.AsNearestPointHitTestResult(VisualTreeHelper.HitTest(root, pointRoot));
- Visual visual = result?.VisualHit;
-
-
- return visual;
- }
+ Exception remoteException = null;
+ bool completed = false;
- // Ensures that an element is enabled; throws exception otherwise
- internal static void CheckEnabled(Visual visual)
- {
- UIElement el = visual as UIElement;
-
- if( el != null && ! el.IsEnabled )
+ object retVal = dispatcher.Invoke(
+ DispatcherPriority.Send,
+ TimeSpan.FromMinutes(3),
+ (DispatcherOperationCallback)delegate (object unused)
{
- throw new ElementNotEnabledException();
- }
- }
-
- internal static object Invoke(AutomationPeer peer, DispatcherOperationCallback work, object arg)
- {
- Dispatcher dispatcher = peer.Dispatcher;
-
- // Null dispatcher likely means the visual is in bad shape!
- if( dispatcher == null )
- {
- throw new ElementNotAvailableException();
- }
-
- Exception remoteException = null;
- bool completed = false;
-
- object retVal = dispatcher.Invoke(
- DispatcherPriority.Send,
- TimeSpan.FromMinutes(3),
- (DispatcherOperationCallback) delegate(object unused)
+ try
{
- try
- {
- return work(arg);
- }
- catch(Exception e)
- {
- remoteException = e;
- return null;
- }
- catch //for non-CLS Compliant exceptions
- {
- remoteException = null;
- return null;
- }
- finally
- {
- completed = true;
- }
-},
- null);
-
- if(completed)
- {
- if(remoteException != null)
+ return work(arg);
+ }
+ catch (Exception e)
{
- throw remoteException;
+ remoteException = e;
+ return null;
}
- }
- else
- {
- bool dispatcherInShutdown = dispatcher.HasShutdownStarted;
-
- if(dispatcherInShutdown)
+ catch //for non-CLS Compliant exceptions
{
- throw new InvalidOperationException(SR.AutomationDispatcherShutdown);
+ remoteException = null;
+ return null;
}
- else
+ finally
{
- throw new TimeoutException(SR.AutomationTimeout);
+ completed = true;
}
- }
-
- return retVal;
-}
-
- #endregion Internal Methods
-
- //------------------------------------------------------
- //
- // Private Methods
- //
- //------------------------------------------------------
+ },
+ null);
- // Potential enhancement: Consider Visual3Ds in this walk?
- // Does this walk need to continue through the Visual3D tree once
- // we have UIElement3D?
- private static Visual FindVisibleSibling ( Visual parent, int start, bool searchForwards)
+ if (completed)
{
- int index = start;
- int childrenCount = parent.InternalVisualChildrenCount;
-
- while ( index >= 0 && index < childrenCount )
+ if (remoteException is not null)
{
- Visual sibling = parent.InternalGetVisualChild(index);
-
- // if its visible or something other than a UIElement keep it
- if ( !(sibling is UIElement) || (((UIElement)sibling).Visibility == Visibility.Visible ) )
- return sibling;
-
- index += searchForwards ? 1 : -1;
+ throw remoteException;
}
-
- return null;
}
-
- // Potential enhancement - Consider Visual3Ds in this walk?
- // Does this walk need to continue through the Visual3D tree once
- // we have UIElement3D?
- //
- // WARNING: This method is O(N) and can therefore lead to O(N^2) algorithms.
- private static Visual FindVisibleSibling(Visual parent, Visual child, bool searchForwards)
+ else
{
- //
- // First we figure out the index of the specified child Visual. This is why the runtime
- // of this method is O(n).
-
- int childrenCount = parent.InternalVisualChildrenCount;
- int childIndex;
+ bool dispatcherInShutdown = dispatcher.HasShutdownStarted;
- for (childIndex = 0; childIndex < childrenCount; childIndex++)
+ if (dispatcherInShutdown)
{
- Visual current = parent.InternalGetVisualChild(childIndex);
- if (current == child)
- {
- // Found the child.
- break;
- }
+ throw new InvalidOperationException(SR.AutomationDispatcherShutdown);
}
-
- //
- // Now that we have the child index, we can go and lookup the sibling.
- if(searchForwards)
- return FindVisibleSibling(parent, childIndex+1, searchForwards); // (FindVisibleSibling can deal with out of range indices).
else
- return FindVisibleSibling(parent, childIndex-1, searchForwards); // (FindVisibleSibling can deal with out of range indices).
+ {
+ throw new TimeoutException(SR.AutomationTimeout);
+ }
}
- //------------------------------------------------------
- //
- // Private Fields
- //
- //------------------------------------------------------
-
- #region Private Fields
-
- // static class, so no private fields
-
- #endregion Private Fields
+ return retVal;
}
}
-
-
-