How to find out the screen number from qml code?

Question

I need to find out whether the popup is visible on the screen. In Qt, I would call qApp->desktop()->screenNumber(this) within the widget class function.

This code returns -1 when there is no screen number because the given widget is not visible on any screen. I need to find out when this case scenario happens to show the widget on default position on primary screen (when the given screen is not available).

I have no idea how to find out the current screen number in QML code or other way that the pop up is not visible.

Answer 1

I solved the issue by creating a subclass from QQuickWindow, setting the appropriate flags

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setFlags(Qt::WindowStaysOnTopHint | Qt::Popup );

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and creating a function which can be called to find out whether the popup is visible based on the pixel coordinates of the popup

bool BlinkReminderWindow::existPointOnScreen(int x, int y)
{
    return QGuiApplication::screenAt(QPoint(x,y))!=nullptr;
}