Right Click Context Menu Mouse Input not being processed.

[igjpalmer]

Hey Everyone,

I'm encountering an issue with input processing for right click context menus.

I am using version 3.3325.1758.g9aea513 of CEF.

Running with OSR, GPU Disabled. Also, Touchpad and Wheel Scroll Latching, Async Wheel Events, and Threaded Scrolling Disabled.

The issue occurs when I right click the browser, the context menu appears. It's a custom menu (all options but "Back" removed, and Back is disabled because there is nowhere to go).

Clicking outside of the context menu does nothing. I would expect the context menu to close if I click outside of it.

If I click the context menu and then click outside of it, the menu then closes.

I'm not sure what the issue is here. I read another post that seemed to suggest that because the main window was created on the main thread and the context menu created on another thread the input isn't being process correctly.

If that's true, I am not sure how to remedy this.

I would appreciate any help with this.

Thanks,

Joe

[amaitland]

Are you using Windows with multi threaded message loop enabled?

[igjpalmer]

Yes, I am. Is that an issue?

CefRunMessageLoop is called on another thread, so that the browser does not block the game that it's integrated into.

So far everything as has worked fine, except the context menu input.

If I am running the browser on another thread does that mean I need to not use Multi-Threaded-Message-Loop and instead use the External-Message-Loop?

I'm not sure what Windows Message Loop adjustments need to be made when CEF is going to be run on thread that isn't an applications main thread.

[magreenblatt]

Running with OSR, GPU Disabled. Also, Touchpad and Wheel Scroll Latching, Async Wheel Events, and Threaded Scrolling Disabled.
CefRunMessageLoop is called on another thread, so that the browser does not block the game that it's integrated into.

You have a lot going on here so it's hard to say exactly what your problem is. What HWND are you passing as the parent to CefWindowInfo::SetAsWindowless? What thread are you creating that HWND on?

[magreenblatt]

Likely unrelated to your problem but you shouldn't call CefRunMessageLoop if you're using CefSettings.multi_threaded_message_loop.

[igjpalmer]

I was passing NULL into SetAsWindowless, but I have also tried passing the Main Application Window handle which is created on the main thread. That didn't seem to make a difference.

Regarding CefRunMessageLoop, should I only call that if I'm not using multi-threaded-message-loop = true.

If I'm using multi-threaded-message-loop=true, does that mean I should follow example from Cef Client that creates a Message-Only window and processes messages there instead of calling CefRunMessageLoop?

[igjpalmer]

Also, just for reference. I tried disabling a bunch of the command line switches I was using (all except no-sandbox) and the issue still persists. So I'm not sure it's related to my command line switches.

I also verified that the parent window handle is being passed into SetAsWindowless

Also, while this occurs with my OSR rendered browser window, any popups that open in new windows are not experiencing the issue.

[magreenblatt]

Regarding CefRunMessageLoop, should I only call that if I'm not using multi-threaded-message-loop = true.

Correct. With multi-threaded-message-loop = true CEF will internally create a thread and run the UI message loop on that thread.

If I'm using multi-threaded-message-loop=true, does that mean I should follow example from Cef Client that creates a Message-Only window and processes messages there instead of calling CefRunMessageLoop?

Only if you don't already have a message loop in your application.

[magreenblatt]

The native context menu implementation uses Windows APIs and messages. If your HWND is not created on the same thread that runs the context menu (which is the case unless you create your HWND on the CEF UI thread) then message handling sometimes has issues. I would suggest you instead use JavaScript context menus to sidestep the problem completely.

[igjpalmer]

Is there a reference for using Javascript context menu's?