SendMouseWheelEvent does not work

[salvadordf]

The PopupBrowser demo shows how to avoid the "System Error Code 5" problem when the browser needs to show a new popup window in OSR mode.

It creates a hidden form that is used in the TChromium.OnBeforePopup event but in your case you should create a hidden tab.

[salvadordf]

There's a CEF issue with the TChromium.OnBeforePopup event and new popup windows in OSR mode :
https://github.com/salvadordf/CEF4Delphi/issues/249
https://bitbucket.org/chromiumembedded/ ... n-osr-mode

[micmorozov]

My situation is simpler:
I do not create tabs from TChromium.OnBeforePopup event.
I create them as in TabbedBrowser2, only every frame has an OSR browser.
Which is also created dynamically with different context

[salvadordf]

Then the solution is much easier.

Check all TChromium events to see if if any VCL control is created, destroyed or modified inside them.
Sometimes the VCL code has a hidden "RecreateWnd" call inside some other harmless looking function that causes all this issues.

Move all code that modifies VCL controls outside TChromium or TCEFApplication events.

[micmorozov]

I use version: CEF4Delphi uses CEF 73.1.12 which includes Chromium 73.0.3683.75.

As soon as I change

Code: Select all

TChromium.CreateBrowser(TCEFWindowParent);

to

Code: Select all

TChromium.CreateBrowser(nil)

and use TChromium.OnBeforeClose instead TChromium.OnClose

I receive error system 5

[micmorozov]

Found a mistake!

I created tabs with Tchromium before the cef had time to initialize

Sometimes managed to initialize sometimes not