[Windows] Fix horizontal swipes not working when SwipeItems are set in all directions

[Copilot]

Note

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Description

This PR fixes an issue on Windows where horizontal swipes (left/right) would not work when SwipeItems are configured for all four directions (LeftItems, RightItems, TopItems, and BottomItems) on a SwipeView.

Root Cause

The issue was caused by a timing inconsistency in the Windows SwipeView handler:

• MapTopItems and MapBottomItems methods were setting SwipeItems immediately when called
• MapLeftItems and MapRightItems methods were deferring the setting until after the control's IsLoaded event
• This timing difference caused conflicts in the underlying WinUI SwipeControl when all four directions were configured simultaneously

The OnLoaded event handler was only updating LeftItems and RightItems, leaving TopItems and BottomItems to be set at a different time, which interfered with the horizontal swipe functionality.

Solution

The fix ensures consistent timing by:

1. Adding IsLoaded checks to MapTopItems and MapBottomItems methods to defer their execution until the control is loaded
2. Updating the OnLoaded method to include TopItems and BottomItems alongside LeftItems and RightItems
3. Ensuring all four directions are set at the same time after the WinUI SwipeControl has fully loaded

Changes Made

• Modified SwipeViewHandler.Windows.cs to defer all SwipeItems setting until after control load
• Added comprehensive test case Issue23.cs to verify the fix and prevent regressions
• Updated comments to reflect that all SwipeItems (not just Left/Right) need consistent timing

Testing

The fix includes both a HostApp test page and automated UI tests that verify:

• Horizontal swipes work correctly when all four directions are configured
• Vertical swipes continue to work as expected
• All SwipeItems are properly triggered when swiped

Fixes #23.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• 11vvsblobprodcus336.vsblob.vsassets.io
  • Triggering command: dotnet test src/Core/tests/UnitTests/Core.UnitTests.csproj --filter *SwipeView* --verbosity normal (dns block)
• 1p7vsblobprodcus324.vsblob.vsassets.io
  • Triggering command: dotnet test src/Core/tests/UnitTests/Core.UnitTests.csproj --filter *SwipeView* --verbosity normal (dns block)
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)
• 4zjvsblobprodcus390.vsblob.vsassets.io
  • Triggering command: dotnet build src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj --framework net9.0-android (dns block)
  • Triggering command: dotnet test src/Core/tests/UnitTests/Core.UnitTests.csproj --filter *SwipeView* --verbosity normal (dns block)
• 6s7vsblobprodcus313.vsblob.vsassets.io
  • Triggering command: dotnet test src/Core/tests/UnitTests/Core.UnitTests.csproj --filter *SwipeView* --verbosity normal (dns block)
• ajhvsblobprodcus363.vsblob.vsassets.io
  • Triggering command: dotnet test src/Core/tests/UnitTests/Core.UnitTests.csproj --filter *SwipeView* --verbosity normal (dns block)
• d0svsblobprodcus381.vsblob.vsassets.io
  • Triggering command: dotnet test src/Core/tests/UnitTests/Core.UnitTests.csproj --filter *SwipeView* --verbosity normal (dns block)
• e7bvsblobprodcus348.vsblob.vsassets.io
  • Triggering command: dotnet test src/Core/tests/UnitTests/Core.UnitTests.csproj --filter *SwipeView* --verbosity normal (dns block)
• kxqvsblobprodcus376.vsblob.vsassets.io
  • Triggering command: dotnet test src/Core/tests/UnitTests/Core.UnitTests.csproj --filter *SwipeView* --verbosity normal (dns block)
• m16vsblobprodcus374.vsblob.vsassets.io
  • Triggering command: dotnet test src/Core/tests/UnitTests/Core.UnitTests.csproj --filter *SwipeView* --verbosity normal (dns block)
• o3svsblobprodcus318.vsblob.vsassets.io
  • Triggering command: dotnet test src/Core/tests/UnitTests/Core.UnitTests.csproj --filter *SwipeView* --verbosity normal (dns block)
• rcxvsblobprodcus328.vsblob.vsassets.io
  • Triggering command: dotnet test src/Core/tests/UnitTests/Core.UnitTests.csproj --filter *SwipeView* --verbosity normal (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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