Popup.qml

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import QtQuick 2.0

Rectangle {
    id: popup
    radius: Math.round(15*base.scalex())
    color: "#41bb1a"

    state: "invisible"

    states: [
        State {
            name: "invisible"
            PropertyChanges { target: popup; opacity: 0 }
        },

        State {
            name: "visible"
            PropertyChanges { target: popup; opacity: 1.0 }
        }
    ]

    transitions: Transition {
        NumberAnimation { properties: "opacity"; duration: 100 }
    }

    function toggle() {
        if (state == "visible")
            state = "invisible";
        else
            state = "visible";
    }
}