Open
Conversation
Replace Win32WindowHelper (P/Invoke with static fields) with the modern WindowHelper.SetWindowMinSize (OverlappedPresenter API) for setting minimum window size. The Win32WindowHelper caused crashes due to static oldWndProc/newWndProc fields being shared across multiple windows. The minimum window size is now set in the Loaded event handler where XamlRoot is available, rather than before window activation. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Description
Note
This PR was generated with the assistance of GitHub Copilot (AI). All changes should be reviewed carefully.
Fixes #2154
The "Click here to launch the sample" button on the TabView page fails to open the windowing sample window.
Root cause
TabViewWindowingSamplePageusesWin32WindowHelperto set minimum window size via P/Invoke (SetWindowLongPtrto subclass the window procedure). This class uses static fields foroldWndProcandnewWndProc, which causes crashes when multiple windows are involved — the same bug that PR #2007 fixed for other pages by introducingWindowHelper.SetWindowMinSize.Fix
Win32WindowHelper.SetWindowMinMaxSize()withWindowHelper.SetWindowMinSize()(usesOverlappedPresenter.PreferredMinimumWidth/Height)Loadedevent handler whereXamlRootis availableSetupWindowMinSizemethod and its callersDataIdentifierconstant andWin32WindowHelperfieldValidation
dotnet build WinUIGallery\WinUIGallery.csproj /p:Platform=x64— 0 errors