Modal Dialog Problem with QtQuickControls2

StoatPatronus

I'm writing a QML application using QtQuickControls2 (QC2). When I create a QC2 Dialog with the modal property set to true and use the dialog's open() method, my main window is grayed out and the dialog appears, but if I click anywhere in the grayed out window the dialog disappears.

If I try the same test with a QtQuick.Dialogs dialog and set its modality property to Qt.WindowModal, the dialog behaves as expected.

I have tried this on both the desktop version of Qt 5.8.0, and on a Raspberry Pi (without Xorg/X11).

Is there some weird parenting issue going on?

Here's a screen capture of the behaviour: http://imgur.com/a/DZRVZ

And my example code (also available at https://bitbucket.org/johnwoltman/quickcontrolsmodalitytest)

main.qml


/* Demonstrates that QuickControls2 Dialog's don't support modality
 *
 */
import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.0

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    DialogWithQC2 {
        id: dialogThatShouldBeModal
        modal: true
    }

    DialogWithQC1 {
        id: dialogThatIsModal
    }

    Text {
        id: explanation
        text: "Demonstrates that QtQuick.Controls 2.1 dialogs aren't modal";
    }

    Button {
        id: button1
        onClicked: dialogThatShouldBeModal.open()
        x: 0
        y: explanation.height + 10
        text: "Show me a dialog that SHOULD be modal"
    }

    Button {
        onClicked: dialogThatIsModal.open()
        x: 0
        y: button1.height + 40
        text: "Show me a REAL modal dialog"
    }
}

DialogWithQC1.qml

import QtQuick 2.4
import QtQuick.Controls 1.4
import QtQuick.Dialogs 1.2

Dialog {
    modality: Qt.WindowModal
    Rectangle {

        width: 500
        height: 200
        border.width: 1
        color: "yellow"
        Text {
            text: "I am modal"
        }
        Button {
            y: 30
            text: "Close me"
            onClicked: dialogThatIsModal.close()
        }
    }
}

DialogWithQC2.qml

import QtQuick 2.4
import QtQuick.Controls 2.1

Dialog {
    modal: true
    Rectangle {

        width: 500
        height: 200
        border.width: 1
        color: "yellow"
        Text {
            text: "I want to be modal, but if you click in the gray area I'll disappear :-("
        }
        Button {
            y: 30
            text: "Close me"
            onClicked: dialogThatShouldBeModal.close()
        }
    }
}

main.cpp

#include <QGuiApplication>
#include <QQmlApplicationEngine>

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QLatin1String("qrc:/main.qml")));

    return app.exec();
}

Eeli K

@StoatPatronus Set the closePolicy property of the Dialog.

StoatPatronus

@Eeli-K That's exactly what I needed, thanks! Someone else filed a bug report on this a few days ago: https://bugreports.qt.io/browse/QTBUG-60358

rrxmzl

check this doc
https://doc.qt.io/qt-6/qml-qtquick-controls-popup.html#closePolicy-prop