Webview EWO Flickering on Value Change

[jimtaylor]

Hi,

We are trying to interface WinCC OA to a third party GUI that has been made using Qt5.11.

I was thinking that the Webview EWO would be a good way to do this since it would require minimal changes by us or the 3rd party. They have published their Qt application as WebGL (using parameters "-platform webgl"), and I can see their GUI using a Webview EWO. However, the whole Webview flickers as if it is reloading the page every time there is a value change. I will try to attach a video of this behaviour - in the video it is the time changing in the upper right causing the flicker, but it is a lot worse when more things are changing.

This flicker does not occur when viewing the web page using Chrome or Firefox browsers.

Is this something you have come across before? Are there any parameters of the Webview that I can change in WinCC OA to stop this happening? Is there anything the 3rd party should be doing differently when they are publishing their Qt to WebGL?

Thanks,

Jim https://www.winccoa.com/fileadmin/image ... ashing.zip

[Gertjan van Schijndel]

Why not make the application available as an EWO?