DecorLabel.qml

import QtQuick 2.10
import QtQuick.Controls 2.3
import de.skycoder42.QtMvvm.Quick 1.1

Label {
    id: _decorLabel

    ColorHelper {
        id: helper
    }

    property Item edit: _decorLabel.nextItemInFocusChain()

    readonly property bool editHasFocus: edit && edit.focus

    color: editHasFocus ? helper.highlight : helper.text
    opacity: editHasFocus ? 1 : 0.5
}