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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 9, 2014

I think the only mistake is you're grabbing the wrong widget to grab the pixmap. The QWinWidget represents the panel, not the widget inside. We create a QWinWidget, then create another QWidget (so we can edit it in the UI designer) and put the regular widget inside the QWinWidget. Something like this:

AIPanelPlatformWindow windowRef = 0;

sPanel->GetPlatformWindow(m_panel, windowRef);

QWinWidget* winWidget = new QWinWidget(windowRef);

QWidget* panelWidget = new QPanelWidgetWithAllOurControlsInIt(); // I forget the parenting exactly, but you get the idea

winWidget->move(0, 0);

QGridLayout* gridLayout = new QGridLayout;

gridLayout->setContentsMargins(0, 0, 0, 0);

gridLayout->addWidget(panelWidget);

winWidget->setLayout(gridLayout);

In the message proc, it's panelWidget you should getting the QPixmap for, something like this:

QPixmap::grabWidget(panelWidget);  // obviously the variable name may be different since its in another function elsewhere.


Right now, you're grabbing the pixmap for a white panel, and then painting that white panel on your white panel You want to grab the widget that actually had something in it!


Thanks. I made the changes. Still results are the same

I wrote the pixmap to a file (pixmap.save). The pixmap is fine - has captured proper graphics. The bitmap from pixmap is also fine. THe DIBSECTION shows correct height and width. Looks like there is something with DC/selectObject/bitblt.

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