Focus handler methods not called in offscreen browser

[mikebei]

Using the CEF wrapper CEFSharp for my .NET app, I can use the keyboard's Tab key to cycle through my app's controls and into the CEF browser. Once focus makes it to CEF, the Tab key will cycle through the elements of the currently loaded page, as expected. When focus reaches the end of the page, it loops back to the first page element. I have implemented the browser's focus handler to try to pull focus back to my app after focus reaches the bottom of the page, but it appears that the handler's methods are not properly called for offscreen browsers. I see OnSetFocus() get called once but no other focus handler methods ever get called after that.

How can I detect when focus has reached the end of my page?

[magreenblatt]

OnTakeFocus should be called. You can ask on a CefSharp support channel whether it's a known problem.

[mikebei]

Sorry, should have mentioned this in my original post...I had originally posted this question on StackOverflow here: http://stackoverflow.com/questions/3514 ... m-cefsharp. I got a response from CEFSharp's top contributor (by a large margin), stating "Known problem for which there is currently no workaround unfortunately. It's a bug in CEF (CefSharp is just a wrapper). The OnTakeFocus method is never called when using Offscreen Rendering, which is what the WPF control uses."

I also found an issue listed in the CEF Bitbucket project that matches what I am experiencing here: https://bitbucket.org/chromiumembedded/ ... not-called. The problem with that issue is it was listed as specifically affecting OSX and was marked as a duplicate for another issue, which to me looks like a separate OSX-specific issue.

Not sure what to think from there and I can't read through C++ well enough to follow exactly what may be the cause.

[magreenblatt]

What CEF version are you using?

[mikebei]

I'm using 3.2526.1362, which is the version that the latest CEFSharp stable release has set as a dependency.

[amaitland]

I can confirm that OnTakeFocus is not called when using OSR rendering in the context of `CefSharp`. I haven't checked `cefclient`, though I suspect the problem will exist there also.

[magreenblatt]

Please add a bug.

[mikebei]

It was hard for me to provide much in the way of useful details, but I created an issue here:
https://bitbucket.org/chromiumembedded/ ... -offscreen