qwidget can`t effect transparent background

Windyz

hello,

I making fullscreen window by 2 Layers.
but I can`t effect transparent background with foreground layer.
(background is fully white.)

please check this code in my fault.

Widget::Widget(QWidget *parent)
: QWidget(parent)
{
QPalette pal;
QPixmap bg(":/Image/bkgnd.jpg");
pal.setBrush(QPalette::Background,bg);
setAutoFillBackground((false));
setPalette(pal);

// This code is working.(Background Layer)
this->setWindowFlags(Qt::FramelessWindowHint);
this->setAttribute(Qt::WA_TranslucentBackground);

QQuickView *qmlView = new QQuickView;
qmlView->setSource(QUrl::fromLocalFile("QML/main.qml"));

QWidget *container = QWidget::createWindowContainer(qmlView, this);
container->setFixedSize(1920,1080);
container->setAutoFillBackground(false);

// Problem : This code is not working.(Foreground Layer)
container->setWindowFlags(Qt::FramelessWindowHint);
container->setAttribute(Qt::WA_TranslucentBackground);

QVBoxLayout *layout = new QVBoxLayout(this);
setLayout(layout);
setGeometry(container->geometry());
layout->addWidget(container);

}

SGaist

Hi and welcome to devnet,

I'm really not sure you can have a transparent widget with a QtQuick content.

What kind of GUI are you trying to build like that ?

Windyz

@SGaist hello, thanks for kindly reply.
I want to this;

SGaist

Why mix widgets and QtQuick ?

Windyz

@SGaist I want to make qml GUI(QQuickView) on the current widget code(QWidget).
anyway, I think another way to this;
but I can`t merge 2 GUIs(QWidget + QQuickView).

/////main.cpp
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QQuickView *view = new QQuickView();
Mapwidget *mapwidget = new Mapwidget();
view->setSource(QUrl("qrc:/QML/main.qml"));
view->setColor(QColor(Qt::transparent));

QHBoxLayout *layout = new QHBoxLayout(mapwidget);
QWidget *container = QWidget::createWindowContainer(view);
container->setFixedSize(1920,1080);
container->setAutoFillBackground(false);

mapwidget->setLayout(layout);
layout->setMargin(0);
layout->addWidget(container);
mapwidget->showFullScreen();
return app.exec();
}

///mapwidget.cpp
Mapwidget::Mapwidget(QWidget *parent)
: QWidget(parent)
{
QPalette pal;
QPixmap bg(":/Image/bkgnd.jpg");
pal.setBrush(QPalette::Background,bg);
setPalette(pal);
}

J.Hilk

Mixing QML and QWidgets in such a way that one is (partially)transparent to the other is, as far as I know, not possible.

Or at least I never managed it.

May very well be because they rely on totally different rendering mechanics.

SGaist

You have QQuickWidget that you can use to have a QtQuick interface in a widget application. However, I don't think it will solve your problem.

From your code, I don't understand the use of QWidget for just the background of your GUI. Why not go full QtQuick ?