UI is mess when drag a window on browser

[qiangqiang]

Hi Expert

I create an win form application with Win API.
Please see attachment.
The outer red box is a child MDI window of application client, and I create a browser on this window.
And the inner box is another MDI child window. These two windows are siblings.

The issue is when I press left mouse to drag the inner window, the result page is in mess.
But when I release the mouse, the repeated 'shadow' on drag path are gone and everything is OK.

Both the two window style are set with WS_CLIPCHILDREN & ws_clipsiblings.

Any ideas?

UI.png (51.69 KiB) Viewed 4267 times

[magreenblatt]

What Windows version and CEF version? What Windows theme are you using?

[qiangqiang]

Hi

I use Win7 SP1 and the theme is the default Aero themes 'windows 7'

I test with latest CEF build 3.2704, and looks the issue still exists.

Thanks

[qiangqiang]

I embbed the CEF message loop like this

Code: Select all

   while (GetMessage(&msg, NULL, 0, 0))
   {
      static int k = 0;
      TCHAR temp[100];
      wsprintf(temp, L"%d run...\n", k);
      k++;
      OutputDebugString(temp);
      if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
      {
         TranslateMessage(&msg);
         DispatchMessage(&msg);
      }         
         try
         {

            CefDoMessageLoopWork();
         }
         catch (...)
         {
         }

   }


so it looks when the mouse is pressed, the win api GetMessage will block ...
If I want to use the CEF meesage loop like this, how shall I do ?

[qiangqiang]

Some correction,

when I left click mouse and choose the inner window, and drag
the DispatchMessage will block.

One way I can imagine is to add a SetTimer to call CefDoMessageLoopWork .

But I think its very tircky.