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panduvittala
panduvittala
Inspiring
March 3, 2014
Answered

plugin panel with qt GUI turns white while moving panel on windows

  • March 3, 2014
  • 1 reply
  • 3400 views

The subject says it all. My plugin has a panel rendered by qt (using qwinwidget). When I try to move the panel by dragging using mouse, the qt UI part turns completely white. It goes back to normal when the mouse is released. This  happens only on windows - mac works fine. Has anybody faced this issue? How to fix this? Thanks in advance.

Qt: 485

Illustrator: CC

OS: Windows 7 64 bit

This topic has been closed for replies.
Correct answer A. Patterson

Thank you so much.


You can find the sample here. I built it using the upcoming CC SDK but I think it should be okay for compiling on the older CC. If you need to run this on CS6 you may need to tweak a few things, but I think most of the Empty Panel sample code is the same CS6+.

You'll need to have QTDIR defined before opening Studio for this to work. It also uses an environment variable called ILLUSTRATOR that points to the root of the Illustrator folder, but only for debugging.

http://file-post.net/en/fs5/data/1402427655_2834312253_72/?id=Og6sjxBLISjU

Note that this download expires in 3 days. I built the code and got the white-while-dragging bug. Then I dropped in my windows message proc function and it went away, so that should be a good example of the fix.

1 reply

panduvittala
panduvittalaAuthor
Inspiring
April 1, 2014

Help please! I am stuck

V
vincentdoan
Known Participant
April 1, 2014

Post the code and any info relevant info for us to understand the big picture before attempting to guess the problem.

Qt and Ai Plugin solution is very complicated, we all faced many problems and if you don't describle visually and accurately it is hard to help you solve it.

panduvittala
panduvittalaAuthor
Inspiring
June 11, 2014

You can find the sample here. I built it using the upcoming CC SDK but I think it should be okay for compiling on the older CC. If you need to run this on CS6 you may need to tweak a few things, but I think most of the Empty Panel sample code is the same CS6+.

You'll need to have QTDIR defined before opening Studio for this to work. It also uses an environment variable called ILLUSTRATOR that points to the root of the Illustrator folder, but only for debugging.

http://file-post.net/en/fs5/data/1402427655_2834312253_72/?id=Og6sjxBLISjU

Note that this download expires in 3 days. I built the code and got the white-while-dragging bug. Then I dropped in my windows message proc function and it went away, so that should be a good example of the fix.


Thanks a lot Patterson. You are a life saver!

quick reference for people searching for the same issue; Here is the code that worked.

   handled = true;

   QPixmap widgetPixmap =
   QPixmap::grabWidget(panelWidget);
   HBITMAP widgetBitmap = widgetPixmap.toWinHBITMAP();
  
   if (widgetBitmap)
   {
   SPErr err = NOERROR;
   DIBSECTION dibSection = { 0 };
   HDC memdc = 0;
   HGDIOBJ oldObject = 0;

   HDC screenDC = GetDC(0);
   memdc = CreateCompatibleDC(screenDC);
   ReleaseDC(0, screenDC);

   SelectObject(memdc, widgetBitmap);

   if (0 == GetObjectW(widgetBitmap, sizeof(dibSection), &dibSection))
   {
   err = GetLastError();
   } else
   {
   BitBlt(    reinterpret_cast<HDC>(wParam), 0, 0, dibSection.dsBmih.biWidth, dibSection.dsBmih.biHeight,
   memdc, 0, 0, SRCCOPY);
   }
   DeleteDC(memdc);
   DeleteObject(widgetBitmap);
   }
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