QQuickWidget QML not rendered correctly

nwoki

Hi all. I'm porting an old XP application to Qt5 using Widgets. I need to use a Switch element from QML so I have a QQuickWidget element for the purpose. Problem is that the switch is not rendered. What I get instead is a white space where the QML item is supposed to be. Any clues on why this happens?

Here is the code for the QML component used.

P.S - I use this component in two different places. On one place it's correctly rendered whilst on the other it is not.

import QtQuick 2.0
import QtQuick.Controls 1.4


/**
 * !!!IMPORTANT!!!!
 *
 * this class signal "checked" is used by different C++ objects in the project. Careful when modding
 *
 */
Item {
    id: root;

    signal checked(bool checked);

    // use this to get the system colours to use for the background so the switch doesn't stand out too much
    SystemPalette { id: myPalette; colorGroup: SystemPalette.Active }

    Rectangle {
        id: bg;
        color: myPalette.window;
        anchors.fill: parent;
    }

    Switch {
        id: stepLapSwitch;

        anchors {
            centerIn: root;
        }

        onClicked: {
            root.checked(stepLapSwitch.checked);
        }
    }

    function setChecked(checked) {
        stepLapSwitch.checked = checked;
    }
}

p3c0

@nwoki Can you post rest of the code which can reproduce the problem ?

dheerendra

Did you try something like this ? It works. We have used it.

int main(int argc, char *argv[])
{
QApplication app(argc, argv);

QQuickView view;
view.setSource(QUrl(QStringLiteral("qrc:/main.qml")));

QMLWidget w;
QWidget *w1 = QWidget::createWindowContainer(&view,&w);
w1->setFixedSize(400,400);
w.show();

return app.exec();

}

QML code

Rectangle {
visible: true
width: 640
height: 480
color : "green"

Switch {
    anchors.centerIn: parent

}

}

nwoki

@dheerendra Thanks! Specifying the width solved the issue. For some reason I didn't specify it on the second widget.

nwoki

But I have anoter "QQuickWidget QML not rendered correctly" question.

I have a tabbed widget with qquickwidgets in it. The first time the tab page with the QQuickWidgets is rendered, i can see the QML item. If then i switch to the next tab and back again, I end up with a white space.

The QML file I'm using:

import QtQuick 2.2
import QtQuick.Extras 1.4

Item {
    id: root;

    // use this to get the system colours to use for the background so the switch doesn't stand out too much
    SystemPalette { id: myPalette; colorGroup: SystemPalette.Active }

    width: 30;
    height: 30;

    Rectangle {
        id: bg;
        color: myPalette.window;
        anchors.fill: parent;
    }

    StatusIndicator {
        id: indicator;
        height: parent.height - 4;
        width: parent.width - 4;
        anchors.centerIn: parent;
        color: "green";
    }

    function setActive(active) {
        indicator.active = active;
    }
}

Any ideas why I get this behaviour?

P.S - The QQuickWidget is layed out in a .ui form