QML 动态负载 Window 按下按钮，但如果存在则改为焦点

Question

I have a button within my main ApplicationWindow ( root ) that dynamically loads and opens a second, different ApplicationWindow that is declared in a separate .qml file.

Button {
    id: btnLogger
    text: "Logger"
    onClicked: {
        var component = Qt.createComponent("logger.qml")
        var window    = component.createObject(logRoot)
        window.show()
    }
}

This works fine for opening a window when clicking the button. Subsequent clicks create further new windows.

My intent is that subsequent clicks should instead focus the preexisting window. If the new window is later closed, then clicking the button should revert back to opening the window.

ie if a window doesn't currently exist or exists but has been closed, create it and open it; else, focus it.

How would this be done from within qml ? Alternatively, I am currently loading the application from a QQmlApplicationEngine in my C++ , how could I use that to achieve this functionality?

Answer 1

The example code for my comment above:

Button {
    id: btnLogger
    text: "Logger"
    property var wnd: undefined
    onClicked: {
        if(wnd == undefined)
        {
            var component = Qt.createComponent("logger.qml")
            wnd = component.createObject(logRoot);
            wnd.closing.connect(function() { btnLogger.wnd = undefined;});
            wnd.show();
        }
        else
        {
            wnd.requestActivate();
        }
    }
}