Not really SCL problem but CefSharp Cancel The title field is required!

1. Patrik Wikström

   

   73 posts
   Registered:
   15 Oct 2018
   14 Jan

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   Do any of you have experience with CefSharp in that way that if it is active in your Progress application then it occasionally is missing keyboard events e.g. misses characters even when you are typing in Progress fields. Found some things about this but haven't manage to solve this problem.
   
   We have it setup as single threaded and using a Timer for the call Cef:DoMessageLoopWork.
   ...
   mSettings:MultiThreadedMessageLoop = FALSE.
   ...
   CefSharp.Cef:DoMessageLoopWork().
   ...
   
2. Mike Fechner

   

   343 posts
   Registered:
   14 Sep 2016
   16 Jan in reply to Patrik Wikström

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   I haven't experienced that issue. But we are not using Progress GUI Widgets that much anywhere.
   
   Can you provide details? 
   
   And can you also share some references to the "some things" you have found - probably on the Internet? 
3. Patrik Wikström

   

   73 posts
   Registered:
   15 Oct 2018
   16 Jan in reply to Mike Fechner

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   https://github.com/cztomczak/cefpython/issues/246
   "Using external message pump will improve performance, but it is also required to get rid of some bugs, like missing keyboard events on Mac/Windows reported on the CEF Forum"
   
   Under the title "MultiThreadedMessageLoop", we have had the Timer-based solution in use. Not the one described as a better solution, because of mulithreding issues using that approach.
   
   "A more advanced option involves setting CefSettings.ExternalMessagePump = true; and implementing IBrowserProcessHandler.OnScheduleMessagePumpWork. This allows CEF to notify when it needs to perform work, in some instances this may make your application more responsive. "
   https://github.com/cefsharp/CefSharp/wiki/General-Usage
   
   What we are looking into now is to create a .NET class that would call an event on the main UI thread and which could be subscribed from an ABL class.
   
   Some Progress and .NET co-operation links:
   https://community-archive.progress.com/forums/00019/36671.html
   https://community-archive.progress.com/forums/00019/00842.html

4. Patrik Wikström

   

   73 posts
   Registered:
   15 Oct 2018
   1 day and 22 hours ago

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   We might have solved this problem by creating a .NET native class and dll for BrowserProcessHandler e.g. our quick and dirty is something like below. The input value of 30 is the value for the Timer Interval (1000 / 30) that the .NET class uses.
   
               DEFINE VARIABLE xTaskScheduler AS "System.Threading.Tasks.TaskScheduler" NO-UNDO.
   
               IF SynchronizationContext:Current <> ? THEN
                   xTaskScheduler = TaskScheduler:FromCurrentSynchronizationContext().
               ELSE
                   xTaskScheduler = TaskScheduler:Current.
   
               mSettings:ExternalMessagePump = TRUE.
               xInitialize = CefSharp.Cef:Initialize(mSettings, TRUE, NEW ScheduleMessagePumpBrowserProcessHandler(xTaskScheduler, 30)).