import QtQuick 2.1
import QtQuick.Controls 1.1

Item {
    width: 600
    height: 400
    Timer {
        interval: 1000
        running: true
        onTriggered: {console.log('onTriggered, opacity: ' + rect.opacity);  rect.opacity = 0.1 }
    }
    Rectangle {
        id: rect
        width: 200
        height: 200
        anchors.centerIn: parent
        color: "red"
        onOpacityChanged: console.log('opacity: '  + opacity)
        Rectangle {
            color: "blue"
            width: 100
            height: 100
            anchors.centerIn: parent
            MouseArea {
                anchors.fill: parent
                onClicked: rect.opacity = 1 - rect.opacity
            }
        }
    }
}