Solved QQuickWidget Beginner-Problem

[Andy314]

I have a QQuickWidget filled with a qml file.
When this wigdet is unbound show() opens a new windows and I can see my listentries and scroll it,
but when I put the widget on a QDialog is see only the first list entry and I cannot scroll the list. The count text show the correct size.
Why that?

import QtQuick 2.0

Rectangle {
    anchors.fill: parent

   ListModel {
        id: nameModel
        ListElement { name: "Alice" }
        ListElement { name: "Bob" }
        ListElement { name: "Jane" }
        ListElement { name: "Harry" }
        ListElement { name: "Wendy" }
        ListElement { name: "Alice" }
        ListElement { name: "Bob" }
        ListElement { name: "Jane" }
        ListElement { name: "Harry" }
        ListElement { name: "Wendy" }
        ListElement { name: "Alice" }
        ListElement { name: "Bob" }
        ListElement { name: "Jane" }
        ListElement { name: "Harry" }
        ListElement { name: "Wendy" }
        ListElement { name: "Alice" }
        ListElement { name: "Bob" }
        ListElement { name: "Jane" }
        ListElement { name: "Harry" }
        ListElement { name: "Wendy" }
    }
    ListView
    {
        width: 180; height: 200
        anchors.fill: parent
        model: nameModel
        delegate: Text
        {
            font.pixelSize: 20
            text: name + ": "
        }
    }
    Text
    {
        id: textCount
        x: 8
        y: 300
        text: nameModel.count
        font.bold: true
        font.pixelSize: 23
    }
}

[SGaist]

Hi,

How are you putting that widget in your QDialog ?

[Andy314]

Simple tag and drop from the widget palette onto the dialog or what was your question ?

[SGaist]

Ok, that was the first step to identify your setup.

Are you using any layout manager ?

[Andy314]

@SGaist
I gave the dialog a vertical layout. At top I have a promoted frame, second element is the QickWidget.

[SGaist]

Modifying slightly your QML:

import QtQuick 2.0

Rectangle {
    width: 180; height: 200
    color: "blue"

   ListModel {
        id: nameModel
        ListElement { name: "Alice" }
        ListElement { name: "Bob" }
        ListElement { name: "Jane" }
        ListElement { name: "Harry" }
        ListElement { name: "Wendy" }
        ListElement { name: "Alice" }
        ListElement { name: "Bob" }
        ListElement { name: "Jane" }
        ListElement { name: "Harry" }
        ListElement { name: "Wendy" }
        ListElement { name: "Alice" }
        ListElement { name: "Bob" }
        ListElement { name: "Jane" }
        ListElement { name: "Harry" }
        ListElement { name: "Wendy" }
        ListElement { name: "Alice" }
        ListElement { name: "Bob" }
        ListElement { name: "Jane" }
        ListElement { name: "Harry" }
        ListElement { name: "Wendy" }
    }
    ListView
    {
        anchors.fill: parent
        model: nameModel
        delegate: Text
        {
            font.pixelSize: 20
            text: name + ": "
        }
    }
    Text
    {
        id: textCount
        x: 8
        y: 300
        text: nameModel.count
        font.bold: true
        font.pixelSize: 23
    }
}

and using this small main to have several widgets:

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QQuickWidget *widget = new QQuickWidget;
    widget->setSource(QUrl::fromLocalFile("test.qml"));
    widget->setMinimumSize(QSize(200, 200));
    QWidget secondWidget;
    QVBoxLayout *layout = new QVBoxLayout(&secondWidget);
    layout->addWidget(new QLabel("Test me"));
    layout->addWidget(widget);
    secondWidget.show();
    return app.exec();
}

Everything is working

[Andy314]

@SGaist thank you for your detailed help.

I found the problem: "fill-parent" of the root object.
If I give the rect a red color the full area is filled with red. Only the list doesnt work!
The strange thing is, that it works when I open the the pure widget.
Maybe it has something to do with inintilizing (sizing, in dialog invisible for the first time, order, etc.)

When must I initialize the QQickWidget. Constructor of the dialog - or later when it is visible?.

Rectangle {
 //   anchors.fill: parent               ---- Problem

   ListModel {
        id: nameModel
        ListElement { name: "Alice" }

[SGaist]

Technically, the Rectangle is the root of your QML so i'd say that it basically has no parent

[cheezus]

Just wanted to add a general comment here: anchor.fill: parent was the issue for me. As @SGaist says, there is no parent. Would be nice to have a proper error message but c'est la vie.