[Android] CarouselView: Fix touch interception to delegate vertical swipes to nested views

[Dhivya-SF4094]

Note

Are you waiting for the changes in this PR to be merged?
It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!

Issue Details:

When a CarouselView is used with nested scrollable content (e.g., CollectionView), swipe gestures are not handled correctly. By default, the CarouselView intercepts all touch events, including vertical swipes, even when the intent is to scroll the child view.

Root Cause

By default, MauiCarouselRecyclerView overrides OnInterceptTouchEvent and returns true, meaning it intercepts touch gestures before child views (like CollectionView) can process them.
As a result, Vertical swipes however, are also partially intercepted by the Carousel, even when the intent is to scroll inside the nested CollectionView.
This causes a conflict: vertical gestures intended for the inner CollectionView sometimes trigger an unwanted item transition in the CarouselView.

Description of Change

The Android CarouselView touch interception logic now classifies gestures before allowing the CarouselView to intercept them:

• Records the initial touch position on MotionEventActions.Down.
• Waits until movement exceeds Android ViewConfiguration.ScaledTouchSlop.
• Locks the gesture direction once per gesture by comparing horizontal and vertical movement.
• Returns false for off-axis gestures, such as a vertical drag on a horizontal CarouselView, so child/nested content can receive the gesture.
• Latches delegated off-axis gestures for the rest of the touch sequence so the CarouselView does not hijack later move events (for example, when the child reaches its scroll boundary).
• Preserves disabled CarouselView behavior by deferring to the base interception path when the ItemsView is explicitly disabled.

Validated the behaviour in the following platforms

• Android
• Windows
• iOS
• Mac

Issues Fixed:

Fixes #22507

Screenshots

Before	After
22507_Android_BeforeFix.mov	22507_Android_AfterFix.mov

[jsuarezruiz]

/azp run MAUI-UITests-public

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jsuarezruiz]

/rebase

[Copilot]

Pull Request Overview

This PR fixes an issue where CarouselView incorrectly intercepts vertical swipe gestures on Android, preventing proper scrolling of nested scrollable content like CollectionView. The fix improves touch event handling by comparing horizontal and vertical movement to determine whether gestures should be handled by the CarouselView or delegated to child views.

Key changes:

• Modified touch interception logic in MauiCarouselRecyclerView to distinguish between horizontal and vertical swipes
• Added comprehensive UI tests to validate the fix across platforms
• Ensured nested scrollable content can scroll vertically without unwanted CarouselView item transitions

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
MauiCarouselRecyclerView.cs	Enhanced OnInterceptTouchEvent method with directional swipe detection logic
Issue22507.cs (HostApp)	Created test page with CarouselView containing nested CollectionView for reproducing the issue
Issue22507.cs (Tests)	Added automated UI test to verify vertical scrolling works correctly within CarouselView

[jsuarezruiz]

/azp run MAUI-UITests-public

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[sheiksyedm]

/rebase

[Dhivya-SF4094]

Addressed concerns raised in the AI summary.

[MauiBot]

AI Review Summary

@Dhivya-SF4094 — new AI review results are available based on this last commit: cd199d8. To request a fresh review after new comments or commits, comment /review rerun.

---

🗂️ Review Sessions — click to expand

🚦 Gate — Test Before & After Fix

Gate Result: ✅ PASSED

Platform: ANDROID · Base: main · Merge base: 5ec887fa

Test	Without Fix (expect FAIL)	With Fix (expect PASS)
📱 CarouselViewTests (VerticalDragOnHorizontalCarouselIsNotIntercepted) Category=CarouselView	✅ FAIL — 1353s	✅ PASS — 231s

🔴 Without fix — 📱 CarouselViewTests (VerticalDragOnHorizontalCarouselIsNotIntercepted): FAIL ✅ · 1353s

(truncated to last 15,000 chars)

roidX.Navigation.Common.Android.dll -> Xamarin.AndroidX.Navigation.Common.Android.dll.so
  [49/133] Xamarin.AndroidX.Navigation.Fragment.dll -> Xamarin.AndroidX.Navigation.Fragment.dll.so
  [119/133] System.Text.RegularExpressions.dll -> System.Text.RegularExpressions.dll.so
  [120/133] System.Threading.Tasks.dll -> System.Threading.Tasks.dll.so
  [50/133] Xamarin.AndroidX.Navigation.Runtime.Android.dll -> Xamarin.AndroidX.Navigation.Runtime.Android.dll.so
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  [51/133] Xamarin.AndroidX.Navigation.UI.dll -> Xamarin.AndroidX.Navigation.UI.dll.so
  [122/133] System.Threading.Thread.dll -> System.Threading.Thread.dll.so
  [123/133] System.Threading.dll -> System.Threading.dll.so
  [124/133] System.Threading.ThreadPool.dll -> System.Threading.ThreadPool.dll.so
  [52/133] Xamarin.AndroidX.RecyclerView.dll -> Xamarin.AndroidX.RecyclerView.dll.so
  [125/133] System.Xml.ReaderWriter.dll -> System.Xml.ReaderWriter.dll.so
  [126/133] System.Xml.Linq.dll -> System.Xml.Linq.dll.so
  [53/133] Xamarin.AndroidX.SavedState.SavedState.Android.dll -> Xamarin.AndroidX.SavedState.SavedState.Android.dll.so
  [127/133] System.Xml.XDocument.dll -> System.Xml.XDocument.dll.so
  [128/133] System.dll -> System.dll.so
  [129/133] netstandard.dll -> netstandard.dll.so
  [54/133] Xamarin.AndroidX.SwipeRefreshLayout.dll -> Xamarin.AndroidX.SwipeRefreshLayout.dll.so
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  [55/133] Xamarin.AndroidX.ViewPager.dll -> Xamarin.AndroidX.ViewPager.dll.so
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  [132/133] Mono.Android.dll -> Mono.Android.dll.so
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  [133/133] System.Private.CoreLib.dll -> System.Private.CoreLib.dll.so

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:10:47.93
[11.0.0-prerelease.26230.4+92962e5c46ac08a66ded4c5696209cc60f1a232f] XHarness command issued: android test --app /home/vsts/work/1/s/artifacts/bin/Controls.DeviceTests/Release/net10.0-android/com.microsoft.maui.controls.devicetests-Signed.apk --package-name com.microsoft.maui.controls.devicetests --device-id emulator-5554 -o artifacts/log --timeout 01:00:00 -v --arg TestFilter=Category=CarouselView
�[40m�[37mdbug�[39m�[22m�[49m: ADBRunner using ADB.exe supplied from /home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/tools/net10.0/any/../../../runtimes/any/native/adb/linux/adb
�[40m�[37mdbug�[39m�[22m�[49m: Full resolved path:'/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb'
�[40m�[32minfo�[39m�[22m�[49m: Will attempt to find device supporting architectures: 'arm64-v8a', 'x86_64'
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb start-server'
�[40m�[37mdbug�[39m�[22m�[49m: 
�[40m�[32minfo�[39m�[22m�[49m: Finding attached devices/emulators...
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb devices -l'
�[40m�[37mdbug�[39m�[22m�[49m: Found 1 possible devices
�[40m�[37mdbug�[39m�[22m�[49m: Evaluating output line for device serial: emulator-5554          device product:sdk_gphone_x86_64 model:sdk_gphone_x86_64 device:generic_x86_64_arm64 transport_id:2
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb -s emulator-5554 shell getprop ro.product.cpu.abilist'
�[40m�[37mdbug�[39m�[22m�[49m: Found 1 possible devices. Using 'emulator-5554'
�[40m�[32minfo�[39m�[22m�[49m: Active Android device set to serial 'emulator-5554'
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb -s emulator-5554 -s emulator-5554 shell getprop ro.product.cpu.abi'
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb -s emulator-5554 -s emulator-5554 shell getprop ro.build.version.sdk'
�[40m�[32minfo�[39m�[22m�[49m: Waiting for device to be available (max 5 minutes)
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb -s emulator-5554 wait-for-device'
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb -s emulator-5554 -s emulator-5554 shell getprop sys.boot_completed'
�[40m�[37mdbug�[39m�[22m�[49m: sys.boot_completed = '1'
�[40m�[37mdbug�[39m�[22m�[49m: Waited 0 seconds for device boot completion
�[40m�[37mdbug�[39m�[22m�[49m: Working with emulator-5554 (API 30)
�[40m�[37mdbug�[39m�[22m�[49m: Check current adb install and/or package verification settings
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb -s emulator-5554 shell settings get global verifier_verify_adb_installs'
�[40m�[37mdbug�[39m�[22m�[49m: verifier_verify_adb_installs = 0
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb -s emulator-5554 shell settings get global package_verifier_enable'
�[40m�[37mdbug�[39m�[22m�[49m: package_verifier_enable = 
�[40m�[1m�[33mwarn�[39m�[22m�[49m: Installing debug apks on a device might be rejected with INSTALL_FAILED_VERIFICATION_FAILURE. Make sure to set 'package_verifier_enable' to '0'
�[40m�[32minfo�[39m�[22m�[49m: Attempting to remove apk 'com.microsoft.maui.controls.devicetests'..
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb -s emulator-5554 uninstall com.microsoft.maui.controls.devicetests'
�[40m�[1m�[33mwarn�[39m�[22m�[49m: Hit broken pipe error; Will make one attempt to restart ADB server, and retry the uninstallation
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb -s emulator-5554 kill-server'
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb -s emulator-5554 start-server'
�[40m�[37mdbug�[39m�[22m�[49m: 
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb -s emulator-5554 uninstall com.microsoft.maui.controls.devicetests'
�[41m�[30mfail�[39m�[22m�[49m: Error: Exit code: 20
      Std out:
      
      
      Std err:
      - waiting for device -
      cmd: Can't find service: package
      
      
      
�[40m�[32minfo�[39m�[22m�[49m: Attempting to install /home/vsts/work/1/s/artifacts/bin/Controls.DeviceTests/Release/net10.0-android/com.microsoft.maui.controls.devicetests-Signed.apk
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb -s emulator-5554 install /home/vsts/work/1/s/artifacts/bin/Controls.DeviceTests/Release/net10.0-android/com.microsoft.maui.controls.devicetests-Signed.apk'
�[41m�[30mfail�[39m�[22m�[49m: Error:
      Exit code: 1
      Std out:
      Serving...
      Performing Incremental Install
      cmd: Can't find service: package
      Performing Streamed Install
      
      
      Std err:
      adb: failed to install /home/vsts/work/1/s/artifacts/bin/Controls.DeviceTests/Release/net10.0-android/com.microsoft.maui.controls.devicetests-Signed.apk: cmd: Can't find service: package
      
      
      
�[41m�[1m�[37mcrit�[39m�[22m�[49m: Install failure: Test command cannot continue
�[40m�[32minfo�[39m�[22m�[49m: Attempting to remove apk 'com.microsoft.maui.controls.devicetests'..
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb -s emulator-5554 uninstall com.microsoft.maui.controls.devicetests'
�[41m�[30mfail�[39m�[22m�[49m: Error: Exit code: 20
      Std out:
      
      
      Std err:
      cmd: Can't find service: package
      
      
      
�[40m�[32minfo�[39m�[22m�[49m: Attempting to remove apk 'com.microsoft.maui.controls.devicetests'..
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb -s emulator-5554 uninstall com.microsoft.maui.controls.devicetests'
�[41m�[30mfail�[39m�[22m�[49m: Error: Exit code: 20
      Std out:
      
      
      Std err:
      cmd: Can't find service: package
      
      
      
XHarness exit code: 78 (PACKAGE_INSTALLATION_FAILURE)
  Tests completed with exit code: 78

🟢 With fix — 📱 CarouselViewTests (VerticalDragOnHorizontalCarouselIsNotIntercepted): PASS ✅ · 231s

(truncated to last 15,000 chars)

923 I DOTNET  : [FILTER] Excluded test (filtered by Trait; 'Category':'Memory'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'Modal'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'NavigationPage'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'Page'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'Path'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'Picker'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'RadioButton'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'RefreshView'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'ScrollView'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'SearchBar'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'Shape'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'Shell'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'Slider'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'SwipeView'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'TabbedPage'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'TextInput'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'Toolbar'): [Memory] Window Does Not Leak
      06-26 13:39:30.089  5895  5923 I DOTNET  : [FILTER] Included test (filtered by Trait; 'Category':'TemplatedView'): [Memory] Window Does Not Leak
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      06-26 13:39:30.205  5895  5923 I DOTNET  : 	[PASS] AlertDialogButtonColorDarkTheme
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      06-26 13:39:30.337  5895  5923 I DOTNET  : Microsoft.Maui.DeviceTests.AlertDialogTests 0.0646050 ms
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      06-26 13:39:30.972  5895  5934 I DOTNET  : 	[PASS] HiddenCarouselViewNoCrash
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      06-26 13:39:38.949  5895  5972 I DOTNET  : 	[PASS] CarouselViewDataTemplateSelectorSelectorNoCrash
      06-26 13:39:38.949  5895  5972 I DOTNET  : Microsoft.Maui.DeviceTests.CarouselViewTests 8.5904662 ms
      06-26 13:39:38.996  5895  5923 I DOTNET  : Xml file was written to the provided writer.
      06-26 13:39:38.996  5895  5923 I DOTNET  : Tests run: 573 Passed: 10 Inconclusive: 0 Failed: 0 Ignored: 563
�[40m�[32minfo�[39m�[22m�[49m: <<XHARNESS_RESULT_START>>
      {
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        "instrumentationExitCode": 0,
        "device": "emulator-5554",
        "deviceOsVersion": "API 30",
        "architecture": "x86_64",
        "files": [
          {
            "name": "testResults.xml",
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          {
            "name": "adb-logcat-com.microsoft.maui.controls.devicetests-default.log",
            "type": "logcat"
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        ]
      }
      <<XHARNESS_RESULT_END>>
�[40m�[32minfo�[39m�[22m�[49m: Attempting to remove apk 'com.microsoft.maui.controls.devicetests'..
�[40m�[37mdbug�[39m�[22m�[49m: Executing command: '/home/vsts/.nuget/packages/microsoft.dotnet.xharness.cli/11.0.0-prerelease.26230.4/runtimes/any/native/adb/linux/adb -s emulator-5554 uninstall com.microsoft.maui.controls.devicetests'
�[40m�[32minfo�[39m�[22m�[49m: Successfully uninstalled com.microsoft.maui.controls.devicetests
XHarness exit code: 0
  Tests completed successfully

📁 Fix files reverted (1 files)

• src/Controls/src/Core/Handlers/Items/Android/MauiCarouselRecyclerView.cs

---

📱 UI Tests — CarouselView,CollectionView

Detected UI test categories: CarouselView,CollectionView

⚠️ Deep UI tests — 1 category (88 tests) could not run: OneTimeSetUp/fixture setup failure on the platform-pool agent — infrastructure, not a PR test failure (replaces in-process counts above).

🧪 UI Test Execution Results (deep, platform pool)

Category	Tests	Snapshot diffs
CarouselView	0/88 (setup failed; 88 marked failed)	—

⚠️ CarouselView — fixture setup failed for 88 tests

NUnit reported a OneTimeSetUp/fixture setup failure before test bodies ran; the TRX marked each affected test failed.

Multiple setup failure signatures were present; showing the first one. See the TRX artifact for all details.

OneTimeSetUp: System.TimeoutException : CarouselView reverts to displaying first item in collection when collection modified
at UITest.Appium.HelperExtensions.Wait(Func`1 query, Func`2 satisfactory, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 2757
   at UITest.Appium.HelperExtensions.WaitForAtLeastOne(Func`1 query, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 2784
   at UITest.Appium.HelperExtensions.WaitForElement(IApp app, String marked, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency, Nullable`1 postTimeout) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 793
   at Microsoft.Maui.TestCases.Tests._IssuesUITest.NavigateToIssue(String issue) in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/_IssuesUITest.cs:line 54
   at Microsoft.Maui.TestCases.Tests._IssuesUITest.TryToResetTestState() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/_IssuesUITest.cs:line 25
   at Microsoft.Maui.TestCases.Tests.UITest.FixtureSetup() in /_/src/Controls/tests/TestCases.Shared.Tests/UITest.cs:line 576
   at UITest.Appium.NUnit.UITestBase.OneTimeSetup() in /_/src/TestUtils/src/UITest.NUnit/UITestBase.cs:line 221
   at System.RuntimeMethodHandle.InvokeMethod(ObjectHandleOnStack target, Void** arguments, ObjectHandleOnStack sig, BOOL isConstructor, ObjectHandleOnSta
...

📎 Download drop-deep-uitests artifact (TRX + snapshot diffs)

---

📋 Pre-Flight — Context & Validation

Issue: #22507 - [Android] CarouselView behaves strangely when swiping vertically in view
PR: #31790 - [Android] CarouselView: Fix touch interception to delegate vertical swipes to nested views
Platforms Affected: Android
Files Changed: 1 implementation, 1 test

Key Findings

• Issue #22507 reports horizontal Android CarouselView transitioning items during vertical swipes that should scroll nested content.
• PR modifies MauiCarouselRecyclerView.OnInterceptTouchEvent to classify gesture axis after ScaledTouchSlop and delegate off-axis gestures.
• PR adds an Android Controls device test for vertical-dominant drag non-interception.
• GitHub CLI auth was unavailable; public GitHub API and local branch diff were used for context.

Code Review Summary

Verdict: NEEDS_DISCUSSION
Confidence: medium
Errors: 0 | Warnings: 1 | Suggestions: 1

Key code review findings:

• ⚠ The only passing alternative adds more Android gesture infrastructure than the PR's local state machine for equivalent behavior.
• ℹ Consider adding an on-axis CarouselView drag test as follow-up coverage.

Fix Candidates

#	Source	Approach	Test Result	Files Changed	Notes
PR	PR #31790	Parent-level off-axis gesture classifier using ScaledTouchSlop, direction lock, and delegation latch	✅ PASSED (Gate supplied by caller)	src/Controls/src/Core/Handlers/Items/Android/MauiCarouselRecyclerView.cs, src/Controls/tests/DeviceTests/Elements/CarouselView/CarouselViewTests.Android.cs	Original PR

---

🔬 Code Review — Deep Analysis

Code Review — PR #31790

Independent Assessment

What this changes: MauiCarouselRecyclerView.OnInterceptTouchEvent on Android now tracks the initial touch point, waits until movement exceeds ScaledTouchSlop, classifies the gesture's dominant axis, and returns false for off-axis gestures so nested/child content can receive them. It also preserves the explicit-disabled ItemsView path by deferring to the base implementation, which blocks disabled interaction. An Android device test exercises a vertical-dominant drag on a horizontal CarouselView.
Inferred motivation: A horizontal Android CarouselView can intercept vertical gestures intended for nested scrollable content, causing unintended item transitions.

Reconciliation with PR Narrative

Author claims: Fixes #22507 by distinguishing swipe directions and delegating vertical swipes in a horizontal CarouselView to nested content.
Agreement/disagreement: The implementation matches the claimed Android-only bug and preserves prior disabled-state behavior.

Prior Review Reconciliation

Prior ❌ Error Finding	Source	Status	Evidence
Disabled CarouselView could bypass base interception when returning false for delegated/off-axis paths	Prior MauiBot/code review thread	✅ Fixed	OnInterceptTouchEvent first calls base.OnInterceptTouchEvent(ev) when ItemsView?.IsEnabled == false && !ItemsView.IsExplicitlyEnabled.
Direction should only be evaluated after a minimum threshold	jsuarezruiz inline comment	✅ Fixed	_touchSlop = ViewConfiguration.Get(context).ScaledTouchSlop; direction locks only after either axis exceeds slop.
No prior unresolved ❌ Error findings found in the latest local diff.	Local/public API review	✅ Fixed	Current diff includes the disabled guard and slop-gated classifier.

Blast Radius Assessment

• Runs for all instances: Yes, Android CarouselView touch interception runs for every CarouselView gesture.
• Startup impact: No, only a per-instance _touchSlop value is initialized in the platform view constructor.
• Static/shared state: No, all gesture fields are instance fields and reset per gesture.

CI Status

• Required-check result: undetermined; gh is unauthenticated in this environment.
• Classification: local gate was provided as passed by the caller; local candidate tests ran against Android Controls device tests where noted.
• Action taken: confidence capped to medium/low for CI status, but gate result from the prompt is treated as authoritative for this workflow.

Findings

⚠️ Warning — Candidate comparison should prefer simpler local state over heavier gesture infrastructure

The current PR fix is localized and uses Android's documented ScaledTouchSlop. The only passing alternative found in this loop uses GestureDetector, which adds a Java listener object and indirection in a hot touch path for equivalent behavior.

💡 Suggestion — Add an on-axis regression test if desired

The current regression covers off-axis non-interception. A counterpart horizontal-dominant drag test would protect against accidentally disabling CarouselView's own swipe axis.

Failure-Mode Probing

• Child reaches scroll boundary mid-gesture: current PR latches _delegatingToChild, so the CarouselView does not hijack later move events in the same gesture.
• Diagonal tie: absDeltaY > absDeltaX means ties are treated as non-vertical, preserving on-axis CarouselView behavior for a horizontal carousel.
• Missing Down: fields default to zero; unusual platform event ordering could classify from (0,0), but the next Down and Up/Cancel reset state.
• Explicitly disabled CarouselView: base intercept path is preserved before any early false return.

Verdict: NEEDS_DISCUSSION

Confidence: medium
Summary: The PR fix is sound and is the best candidate found by this loop. CI status could not be queried through authenticated gh, but the caller supplied a passed gate result and local Android device-test candidate runs confirmed the regression behavior for the relevant attempts.

---

🛠️ Fix — Analysis & Comparison

Fix Candidates

#	Source	Approach	Test Result	Files Changed	Notes
1	try-fix	Child-scroll-capability probe: find child under touch and recurse through native descendants checking off-axis scroll capability	❌ FAIL	1 file	Fails because the regression item is plain Grid/Label; handler must classify gesture intent independent of native child scrollability.
2	try-fix	Android GestureDetector classifier: use Android internal slop/scroll detection and latch _offAxisGesture	✅ PASS	1 file	Passes Android CarouselView device tests, but adds Java listener/detector complexity in a hot path and is not demonstrably better than PR fix.
3	try-fix	Child-side RequestDisallowInterceptTouchEvent from a custom Carousel item wrapper	❌ FAIL	3 files	Requires full dispatch-path semantics/test rewrite; fails the existing gate regression, which probes OnInterceptTouchEvent directly.
PR	PR #31790	Parent-level ScaledTouchSlop classifier with direction lock and delegation latch	✅ PASSED (Gate)	2 files	Best fit for the verified regression and simpler than passing alternative.

Cross-Pollination

Model	Round	New Ideas?	Details
maui-expert-reviewer	1	Yes	Candidate 1: child-scroll-capability probe.
maui-expert-reviewer	2	Yes	Candidate 2: GestureDetector-delegated classifier after Candidate 1 failure.
maui-expert-reviewer	3	Yes	Candidate 3: child-side RequestDisallowInterceptTouchEvent after Candidate 2 passed but was not clearly better.
maui-expert-reviewer	4	No	Remaining meaningful approaches collapse into variants of parent-level gesture-axis classification; the PR already implements the simplest passing version.

Exhausted: Yes
Selected Fix: PR's fix — Candidate 2 passed but is more complex; Candidates 1 and 3 failed the stable Android regression criteria. The PR fix remains the simplest robust solution that passes the supplied gate.

---

📝 Recommended PR Title & Description

Assessment: ✏️ Recommend updating — the current title is good, but the description overstates that MauiCarouselRecyclerView.OnInterceptTouchEvent simply returns true by default and does not mention the final touch-slop direction lock, gesture delegation latch, disabled-control guard, or Android regression test.

Recommended title

[Android] CarouselView: Fix touch interception to delegate vertical swipes to nested views

Recommended description

### Issue Details:

When a CarouselView is used with nested or child content on Android, swipe gestures are not handled correctly. A horizontal CarouselView can intercept vertical-dominant drag gestures that should be delegated to the child content, causing unwanted CarouselView item transitions instead of allowing the intended vertical interaction.

### Root Cause

`MauiCarouselRecyclerView.OnInterceptTouchEvent` previously deferred swipe-enabled gestures to the base RecyclerView interception behavior without first distinguishing the user's intended gesture axis. As a result, vertical-dominant gestures with enough horizontal movement could still be treated as CarouselView page swipes.

### Description of Change

The Android CarouselView touch interception logic now classifies gestures before allowing the CarouselView to intercept them:

- Records the initial touch position on `MotionEventActions.Down`.
- Waits until movement exceeds Android `ViewConfiguration.ScaledTouchSlop`.
- Locks the gesture direction once per gesture by comparing horizontal and vertical movement.
- Returns `false` for off-axis gestures, such as a vertical drag on a horizontal CarouselView, so child/nested content can receive the gesture.
- Latches delegated off-axis gestures for the rest of the touch sequence so the CarouselView does not hijack later move events.
- Preserves disabled CarouselView behavior by deferring to the base interception path when the `ItemsView` is explicitly disabled.

An Android device regression test was added to verify that a vertical-dominant drag on a horizontal CarouselView is not intercepted.

### Validated the behaviour in the following platforms
- [x] Android
- [ ] Windows
- [ ] iOS
- [ ] Mac

### Issues Fixed:
Fixes #22507

### Screenshots
| Before | After |
|--------|-------|
| <video src="https://github.com/user-attachments/assets/8cda4135-cae8-45a6-9508-33769704ca67"> | <video src="https://github.com/user-attachments/assets/34a30017-3640-4865-83ec-cf90a0347412"> |

---

🏁 Report — Final Recommendation

Comparative Report — PR #31790

Candidate ranking

Rank	Candidate	Regression result	Assessment
1	pr	✅ Passed	Best candidate. It fixes the verified Android CarouselView off-axis interception regression with a localized parent-level gesture classifier using ScaledTouchSlop, direction locking, and a delegation latch.
2	pr-plus-reviewer	✅ Passed	Equivalent to pr; the expert reviewer produced no actionable inline findings, so no sandbox changes were applied. Ranked below pr only because it does not differ from the submitted fix.
3	try-fix-2	✅ Passed	Functionally valid, but uses Android GestureDetector plus an additional Java listener object in a touch hot path for equivalent behavior. It is more complex than the PR's direct state machine without a corresponding benefit.
4	try-fix-1	❌ Failed	Child-scroll-capability probing does not satisfy the regression because the failing scenario can occur over plain non-scrollable item content. It also lacks the PR's per-gesture delegation latch.
5	try-fix-3	❌ Failed	Child-side RequestDisallowInterceptTouchEvent did not satisfy the stable gate, which directly probes the parent OnInterceptTouchEvent behavior. It would require changing test semantics and is not a drop-in fix.

Comparative analysis

The passing candidates all address gesture-axis classification at the Android CarouselView touch boundary. The raw PR does this with the least machinery: it stores the initial touch point, waits for movement beyond Android touch slop, classifies the dominant axis once, and keeps returning false for the rest of an off-axis gesture. That directly targets the verified failure mode where a vertical-dominant drag on a horizontal CarouselView was intercepted by the carousel.

pr-plus-reviewer adds no changes because expert review returned no actionable inline findings. It is therefore not a distinct improvement over the submitted PR.

try-fix-2 also passes, but it moves the same classification into GestureDetector and a nested listener. That increases object/lifecycle complexity in a touch hot path while producing the same externally verified behavior. The simpler PR state machine is easier to reason about and better aligned with the narrow Android handler fix.

The failed candidates must rank below all passing candidates. try-fix-1 fails because off-axis delegation cannot depend on whether the touched child currently reports native scrollability; the regression test uses plain Grid/Label content. try-fix-3 fails because child-side disallow-intercept logic is bypassed by the parent-level interception path covered by the gate.

Winner

Winner: pr

Rationale: The raw PR fix is the simplest passing implementation, preserves disabled CarouselView behavior, requires no expert-review follow-up changes, and avoids the additional Android GestureDetector infrastructure used by the only passing alternative.

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🧭 Next Steps — review latest findings

No alternative fix was selected for this run. Review the session findings and CI results before merging.

[github-actions]

Tests Failure Analysis

@Dhivya-SF4094 — test-failure review results are available based on commit cd199d8.
To request a fresh review after new comments, commits, or CI runs, comment /review tests.

Test Failure Review: Not ready - click to expand

Overall verdict: Not ready

The Android API 30 UI tests (Publish the android_ui_tests_controls_30 test results) show a deterministic regression vs base — 2 legs were green on base build 1483327 but red on this PR, which directly modifies Android CarouselView touch handling and warrants investigation. The remaining 10 failures are unattributed (indeterminate) infrastructure and flakiness issues that cannot be cleared without human review; 11 unexplained build legs and 7 unverified device-test green checks further block the gate.

Coverage: 162 checks · 153 passing · 9 failing · 0 pending · 0 inaccessible · 1 unmapped · 11 unexplained build legs · 0 unaccounted failing checks · 0 aborted failing checks · 0 canceled-build checks · 7 device-test unverified · 10 unattributed · 2 regressed-vs-base. Deterministic ceiling: Not ready — 1 unmapped check (Build Analysis), 11 unexplained build legs, 10 unattributed failures, 7 device-test checks unverified, 2 legs regressed vs base.

Failure	Verdict	On base?	Evidence
Publish the android_ui_tests_controls_30 test results - build error	Likely PR-caused	no — regressed	regressed-vs-base; 2 legs GREEN on base build 1483327, RED on this PR; PR modifies Android CarouselView touch interception directly affecting the API 30 controls suite; "There are one or more test failures detected in result files"
SoftInputExtensionsPageTest	Needs human investigation	no — regressed (leg; ci-scan demoted)	indeterminate; leg-level regressed but ci-scan #36083 (recurring/test) demoted attribution; NullReferenceException; 2 occurrences
VerifyEntryControlWhenPlaceholderTextSet	Needs human investigation	no — regressed (leg; ci-scan demoted)	indeterminate; leg-level regressed but ci-scan #35958 (recurring/leg) demoted attribution; app crash ("app was expected to be running still"); 2 occurrences
CookiesCorrectlyLoadWithMultipleWebViews	Needs human investigation	also-red	indeterminate; ci-scan #36117 (recurring/test); TimeoutException; 6 occurrences; also on base by test (alsoFailsOnBaseline)
WebViewNoCrashPopup	Needs human investigation	also-red	indeterminate; ci-scan #36037 (recurring/leg); app unresponsive/force-terminated ("App.AppState query did not complete"); 4 occurrences; not on base by test
WebViewDoesntCrashWhenLoadingAHeavyPageAndUsingExecutionModeSeparateProcess	Needs human investigation	also-red	indeterminate; ci-scan #36037 (recurring/leg); app unresponsive/force-terminated; 4 occurrences; also on base by test
DeviceTestsWindows (Windows) - build error	Needs human investigation	also-red	indeterminate; PowerShell exited with code 1; Windows device test build error; leg also red on base build
to find package 'platform-tools;35.0.2'	Needs human investigation	yes	indeterminate; ci-scan #35958 (recurring/leg); avdmanager exited with error; also on base by test but leg succeeded-on-base; 2 platform variants (unknown, android)
MemoryLeakB42329	Needs human investigation	yes	indeterminate; ci-scan #35957 (recurring/test); TimeoutException waiting for element; 2 occurrences; also on base by test, leg inconclusive on base
Publish the ios_ui_tests_mono_controls_latest test results - build error	Needs human investigation	no	indeterminate; "There are one or more test failures detected in result files"; base leg comparison inconclusive
Build Analysis	Insufficient data	—	Unmapped check; no inspectable AzDO build evidence; see Arcade landing page

Recommended action

A human reviewer should inspect the Publish the android_ui_tests_controls_30 test results logs to confirm whether the regression is caused by the CarouselView touch interception change, then confirm or dismiss the remaining unattributed failures and verify device-test results before merging.

Evidence details

PR scope: 2 files changed (1 test file); Android platform only; area-controls-collectionview. PR title: [Android] CarouselView: Fix touch interception to delegate vertical swipes to nested views.

Builds inspected:

• maui-pr-devicetests build 1482483 (PR), base build 1483328 (refs/heads/main, 06/26/2026)
• maui-pr-uitests build 1482482 (PR), base build 1483327 (refs/heads/main, 06/26/2026); only 8 of 30 failed build logs were inspected — baseline list may be incomplete.

Deterministic regression: Publish the android_ui_tests_controls_30 test results - build error appears on 2 legs of the Controls (API 30) Border/BoxView/Brush/Button job. Both legs show green in base build 1483327 but red on this PR. The PR's changes to Android CarouselView OnInterceptTouchEvent are in the same platform area as the failing API 30 UI test suite.

Unexplained build legs (11): Failed legs that produced no extractable failure — open each leg's log to inspect: Controls ViewBaseTests/VisualStateManager/Window, Controls Page/Performance/Picker/ProgressBar, Controls SearchBar/Shape/Slider, Controls (vlatest) Editor/Effects/Essentials/FlyoutPage/Focus/Fonts/Frame/Gestures/GraphicsView, Publish the mac_ui_tests_controls test results, Controls (vlatest) WebView, Controls Layout, Controls (API 30) Border/BoxView/Brush/Button, Controls ListView, Controls CollectionView.

Unverified device tests (7): All major maui-pr-devicetests green checks (Android CoreCLR, Android Mono, MacCatalyst Mono, Windows build, iOS Mono, ios/catalyst/android Mono build) read green, but Failed == 0 could not be positively confirmed. Helix aggregation returned 404; no authenticated test API was available. XHarness exits 0 even on device test failure.

ci-scan demotions (2): SoftInputExtensionsPageTest and VerifyEntryControlWhenPlaceholderTextSet both show leg-level regression, but ci-scan base-history patterns (#36083, #35958) indicate recurring flakiness; attribution was demoted to indeterminate for both.

AzDO access: Unauthenticated. Build metadata, timelines, and logs queried from public AzDO REST API. Helix test results unavailable (404 response). No authenticated test-run API queries.

[Dhivya-SF4094]

Verified the CI failed test case; the same tests passes locally.