import QtQuick 2.4

Item {
    width: 300
    height: 300

    MouseArea {
        anchors.fill: parent
        hoverEnabled: true
    }

    Rectangle {
        width: 150
        height: 150
        anchors.centerIn: parent
        color: mouseArea.containsMouse ? "#585" : "#555"

        MouseArea {
            id: mouseArea
            anchors.fill: parent
            hoverEnabled: true
            onContainsMouseChanged: console.log('containsMouse?', containsMouse)
        }
    }
}