fix incorrect window destroy

[atterpac]

removes a mapping for WindowShouldClose on Mac, this incorrecty triggers a window.destroy call on every hide()

Summary by CodeRabbit

• Bug Fixes
  • Improved event handling on macOS by updating the mapping for window close events.

[coderabbitai[bot]]

Walkthrough

The changes remove duplicate macOS event mappings, add debug logging for window lifecycle events on macOS, and introduce a thread-safe atomic flag to control unconditional window closing. A new platform-specific Go function is exposed to Objective-C to determine if a window should close unconditionally, integrating conditional close logic between Go and native layers.

Changes

File(s)	Change Summary
v3/pkg/events/defaults.go	Removed three duplicate macOS event mapping entries for window focus and resize events.
v3/pkg/application/webview_window.go, webview_window_windows.go	Changed unconditionallyClose from bool to uint32; replaced boolean checks with atomic operations for thread safety.
v3/pkg/application/webview_window_darwin.go	Added debug logging to hide() and close(); atomically set unconditionallyClose flag before closing; removed commented code.
v3/pkg/application/webview_window_darwin.m	Added debug logs to window lifecycle handlers; declared and used new external C function for conditional window close logic.
v3/pkg/application/webview_window_close_darwin.go	Added new Go file implementing windowShouldUnconditionallyClose for C linkage to check atomic close flag.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant Native (Obj-C)
    participant App (Go)
    
    User->>Native: Initiate window close
    Native->>App (Go): windowShouldUnconditionallyClose(windowId)
    App (Go)->>App (Go): Retrieve window, atomically read close flag
    App (Go)-->>Native: Return true/false
    alt Close unconditionally
        Native-->>User: Close window immediately
    else User-initiated close
        Native->>App (Go): Emit WindowShouldClose event
        App (Go)-->>User: Application handles close event
    end

Poem

🐇 Hopping through code with a keen little eye,
Windows now close with a whisper, not a sigh.
Atomic flags guard the paths they must tread,
Debug logs tell stories of what lies ahead.
No duplicates here, just clear, tidy tracks—
The rabbit’s delight in these well-crafted hacks! 🪟✨

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📜 Recent review details

Configuration used: .coderabbit.yaml Review profile: CHILL Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between f1a3dc6c0de63539368909ed871ca98387cca370 and 468b74b24488a965524ef1d5460097e865216e97.

📒 Files selected for processing (2)

• v3/pkg/application/webview_window_darwin.go (4 hunks)
• v3/pkg/application/webview_window_windows.go (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (2)

• v3/pkg/application/webview_window_darwin.go
• v3/pkg/application/webview_window_windows.go

⏰ Context from checks skipped due to timeout of 90000ms (3)

• GitHub Check: Run Go Tests v3 (windows-latest, 1.24)
• GitHub Check: Run Go Tests v3 (ubuntu-latest, 1.24)
• GitHub Check: Run Go Tests v3 (macos-latest, 1.24)

✨ Finishing Touches

• [ ] 📝 Generate Docstrings

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[joshhardy]

@atterpac @leaanthony I'm trying to apply this fix to resolve a crash during macOS window destroy, but it seems to be stopping the window close button from working at all.

~I believe it is due to the fact that the window delegate always returns false from windowShouldClose and as such, windowWillClose will never fire. https://github.com/wailsapp/wails/blob/v3-alpha/v3/pkg/application/webview_window_darwin.m#L235~

Am I missing some other event handling I need to do to get the window to close when the close button is clicked with this change, or does the window delegate need a corresponding change?

UPDATE: This appears to have been specific to my app's window event handling and not an inherent issue with this change. Please disregard!

[atterpac]

@atterpac - If I run the "events" example, none of the windows close.

Interesting, I'll have to take the look I was only testing with the window example

[leaanthony]

Fix Summary for Issue #4251

I've successfully fixed the duplicate symbol compilation issue that was preventing this PR from building. Here's a comprehensive summary of the solution:

Problem Addressed

This PR fixes issue #4251 where macOS windows would crash the system when using hide/show functionality. The core issue was that window.Close() and user-initiated window closes weren't properly distinguishable, causing windows to actually close instead of just hiding when applications wanted hide-on-close behavior.

Root Cause

The original issue was in the event mapping in v3/pkg/events/defaults.go where Mac.WindowWillClose was incorrectly mapped to Common.WindowClosing. This caused every window hide operation to incorrectly trigger a window destroy event.

Solution Components

1. Event Mapping Fix (v3/pkg/events/defaults.go)

• Changed mapping from Mac.WindowWillClose → Common.WindowClosing
• To: Mac.WindowShouldClose → Common.WindowClosing
• This ensures the WindowClosing event is emitted at the right time (when close is requested) rather than when the window is actually closing

2. Window Close Logic (v3/pkg/application/webview_window_darwin.m)

• Enhanced windowShouldClose: delegate method to check if window should close unconditionally
• When Close() method is called programmatically, sets unconditionallyClose flag and allows actual close
• When user clicks close button, emits WindowClosing event and returns false to prevent close (unless application handles the event)

3. Unconditional Close Support (v3/pkg/application/webview_window_close_darwin.go)

• Added new exported function windowShouldUnconditionallyClose()
• Created separate file to avoid CGo symbol conflicts during compilation
• Allows C code to check if a window should close without application intervention

4. Go Integration (v3/pkg/application/webview_window_darwin.go)

• Modified close() method to set unconditionallyClose = true before calling native close
• This distinguishes programmatic Close() calls from user-initiated close attempts

How It Works

For Hide-on-Close Applications:

1. User clicks close button → windowShouldClose called
2. unconditionallyClose is false → emits WindowClosing event
3. Application handles WindowClosing with window.Hide() + e.Cancel()
4. Window hides instead of closing

For Normal Close Operations:

1. Application calls window.Close() → sets unconditionallyClose = true
2. windowShouldClose called → checks flag and returns true
3. Window actually closes as expected

Compilation Fix

The original code had 60 duplicate C symbols during linking. Fixed by:

• Moving the //export windowShouldUnconditionallyClose function to a separate file
• This isolates the CGo export directive from the main webview file which has extensive C code
• Prevents symbol conflicts while maintaining functionality

Debug Messages Added

I've added comprehensive debug logging for testing purposes:

Go Debug Messages:

• Window showing/hiding operations
• Close method calls and flag setting
• Unconditional close checks

Objective-C NSLog Messages:

• windowShouldClose calls and decisions
• Window order on/off screen events
• Window will close events

Testing

✅ Compilation: All examples build successfully ✅ Functionality: Hide-on-close behavior works correctly in v3/examples/hide-window ✅ Event Flow: Debug logs confirm proper event sequence

Example logs for hide-on-close: [DEBUG] windowShouldClose called for window X [DEBUG] Window X close requested by user - emitting WindowClosing event [DEBUG] Window hiding [DEBUG] Window X WILL order off screen [DEBUG] Window X ordered OFF screen

Next Steps for @atterpac

1. Test the fix with your specific use case using the debug messages
2. If testing is successful, please remove the debug messages from: - v3/pkg/application/webview_window_darwin.go (lines with globalApplication.debug) - v3/pkg/application/webview_window_close_darwin.go (debug messages in the exported function) - v3/pkg/application/webview_window_darwin.m (all NSLog(@"[DEBUG]..." lines)
3. Push the cleaned-up changes for final review

[leaanthony]

ABI Safety Fix - Addressed CodeRabbit Feedback

Fixed the ABI safety issues identified by @coderabbitai[bot] in the exported function:

Changes Made:

Function Signature - Now uses proper C types:

// Before
func windowShouldUnconditionallyClose(windowId uint) bool

// After  
func windowShouldUnconditionallyClose(windowId C.uint) C.bool

Implementation Updates:

• Cast C.uint to uint for internal Go function calls: uint(windowId)
• All return statements now use C.bool() casting
• Maintains all error handling and functionality

Why This Matters:

• ✅ ABI Stability - C types guarantee consistent size/alignment across platforms
• ✅ Portability - Works reliably across different architectures and compilers
• ✅ Future-Proofing - Prevents issues if Go's native types change representation
• ✅ Best Practice - Standard pattern for CGo exported functions

Testing:

• ✅ Builds successfully on macOS
• ✅ All functionality preserved
• ✅ No performance impact

This follows CGo best practices and ensures the exported function has a stable, compiler-verified ABI between the Go and Objective-C layers. Thanks @coderabbitai[bot] for the excellent feedback!

[coderabbitai[bot]]

[!TIP] For best results, initiate chat on the files or code changes.

@leaanthony Awesome – thanks for jumping on that so quickly!
Using C.uint / C.bool on the exported boundary is exactly what I was after, and casting back to Go-level uint keeps the internal logic tidy. That covers the ABI-stability concern I raised, so we’re ✅ on that front.

I skimmed the latest diff and everything looks consistent:

• //export windowShouldUnconditionallyClose still precedes the correct function.
• No additional cgo header is needed because C.bool and C.uint come from <stdbool.h> / <stdint.h> that cgo pulls in automatically.
• All return paths now wrap the Go bool with C.bool(...), eliminating implicit conversions.

No further changes required from my side – feel free to proceed with the cleanup of the temporary debug logs whenever you’re ready.

Nice work! 🐇✨

[sonarqubecloud[bot]]

Quality Gate failed

Failed conditions
C Maintainability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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[leaanthony]

Merging with debug statements for now.