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Add ScanOptions.NativeWindowHandle to scope Scans to rooted UIA sub-t…
…ree (#1022) Adds: - ScanOptions property settable to IntPtr for HWND of root of subtree to be scanned - Teach PID descendants search to operate on HWND's subtree instead of GetRootElement - Add Integration test for test app leaf node scan Proposal to address issue #1021
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| // Copyright (c) Microsoft. All rights reserved. | ||
| // Licensed under the MIT license. See LICENSE file in the project root for full license information. | ||
|
|
||
| using Axe.Windows.Core.Enums; | ||
| using Axe.Windows.Desktop.UIAutomation; | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Diagnostics; | ||
| using System.Linq; | ||
| using System.Runtime.InteropServices; | ||
| using UIAutomationClient; | ||
|
|
||
| namespace Axe.Windows.AutomationTests | ||
| { | ||
| /// <summary> | ||
| /// Wrapper for CUIAutomation COM object | ||
| /// </summary> | ||
| public class A11yAutomationUtilities | ||
| { | ||
| internal static DesktopElement GetRootElement() | ||
| { | ||
| IUIAutomation uiAutomation = A11yAutomation.GetDefaultInstance().UIAutomation; | ||
| IUIAutomationElement focusedElement = uiAutomation.GetRootElement(); | ||
| return new DesktopElement(focusedElement, keepElement: true, setMembers: true); | ||
| } | ||
|
|
||
| internal static DesktopElement GetFocusedElement() | ||
| { | ||
| IUIAutomation uiAutomation = A11yAutomation.GetDefaultInstance().UIAutomation; | ||
| IUIAutomationElement focusedElement = uiAutomation.GetFocusedElement(); | ||
| return new DesktopElement(focusedElement, keepElement: true, setMembers: true); | ||
| } | ||
|
|
||
| internal static DesktopElement GetDepthFirstLastLeafHWNDElement(DesktopElement rootElement) | ||
| { | ||
| var walker = A11yAutomation.GetDefaultInstance().GetTreeWalker(TreeViewMode.Control); | ||
| try | ||
| { | ||
| IUIAutomationElement rootAutomationElement = rootElement.PlatformObject; | ||
| IUIAutomationElement leafElement = FindLastWindowHandleElement(rootAutomationElement); | ||
|
|
||
| return leafElement is null | ||
| ? rootElement | ||
| : new DesktopElement(leafElement, keepElement: true, setMembers: true); | ||
| } | ||
| finally | ||
| { | ||
| Marshal.ReleaseComObject(walker); | ||
| } | ||
|
|
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| IUIAutomationElement FindLastWindowHandleElement(IUIAutomationElement parent) | ||
| { | ||
| List<IUIAutomationElement> matchingElements = new(); | ||
| for (var child = walker.GetFirstChildElement(parent); child != null; child = MatchAndMoveNext(child)) | ||
| { | ||
| } | ||
|
|
||
| foreach (var element in matchingElements) | ||
| { | ||
| FindLastWindowHandleElement(element); | ||
| } | ||
|
|
||
| foreach (var element in matchingElements.Take(matchingElements.Count - 1)) | ||
| { | ||
| Marshal.ReleaseComObject(element); | ||
| } | ||
|
|
||
| return matchingElements.LastOrDefault(); | ||
|
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| IUIAutomationElement MatchAndMoveNext(IUIAutomationElement element) | ||
| { | ||
| IUIAutomationElement next; | ||
| try | ||
| { | ||
| next = walker.GetNextSiblingElement(element); | ||
| } | ||
| catch(COMException e) | ||
| { | ||
| Debug.WriteLine(message: $"Error getting sibling of {element.CurrentName}: {e}"); | ||
| next = null; | ||
| } | ||
|
|
||
| if (element.CurrentNativeWindowHandle != IntPtr.Zero) | ||
| { | ||
| Debug.WriteLine(message: $"HWND={element.CurrentNativeWindowHandle}; Name='{element.CurrentName}'; ClassName='{element.CurrentClassName}'"); | ||
| matchingElements.Add(element); | ||
| } | ||
| else | ||
| { | ||
| Marshal.ReleaseComObject(element); | ||
| } | ||
|
|
||
| return next; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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