QT5.15.2 No background image from QPixmap

TheoSys

I have a couple of QLineEdit widgets and want to have a background image. I've found a lot of examples showing this with a CSS (setStylesheet()) method. In my case I can't use this method, because the image is drawn during run time. After the Image was drawn, I create a new QLineEdit and want the just drawn image as a background. But this seems not to work. Below is a simplified version of the code I use:

[...]
    QLineEdit *linetext = new QLineEdit(button->getText().c_str(), parent);
    linetext->setFixedSize(button->getWidth(), button->getHeight());
    linetext->move(button->getLeftPosition(), button->getTopPosition());
    linetext->setFrame(false);
    Button::BITMAP_t bm = button->getLastImage();

    QPixmap pix(bm.width, bm.height);
    QImage img(bm.buffer, bm.width, bm.height, QImage::Format_ARGB32);
    pix.convertFromImage(img);

    QPalette palette;
    palette.setBrush(QPalette::Base, QBrush(pix));
//    palette.setBrush(QPalette::Window, QBrush(pix));    // <-- doesn't work either
    linetext->setPalette(palette);
   obj->object.linetext->show();
[...]

Is there a way to get the image to the background of QLineEdit? What is wrong with my code?
The above method work fine with QLabel.

In case you're interested in the whole code (huge!) you can download the open source version with svn:

svn co https://www.theosys.at/svn/tpanel

The part in question is in file tqtmain.cpp starting at line 1378 (method MainWindow::inputText(Button::TButton* button)). The code compiles on Linux and for Android. You need, beside QT, the Skia library (https://skia.org/docs/user/download) to compile the code.

mrjj

Hi

I think it's maybe the picture itself as

  QPalette palette;
    QPixmap pix(":/abstract-geometric-pattern-lines-rhombuses-260nw-573952828.jpg");
    palette.setBrush(QPalette::Base, QBrush(pix));
    ui->lineEdit_2->setPalette(palette);

alt text

just worked.

try save it to a file and see if its valid.

TheoSys

Thanks for your reply. The tip to save the graphic into a file helped me a lot because I saw, that I get what I see. The 'setBrush()' function works and shows my graphic.

A.T.