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** This file is part of the QtSensors module of the Qt Toolkit.
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import QtQuick 2.0
import QtSensors 5.0
import Grue 1.0

Rectangle {
    id: root
    width: 320
    height: 480
    color: "black"

    property int percent: 0
    property string text: ""
    property real grueOpacity: 0.0

    function updateStatus(newPercent, newOpacity, newText) {
        if (root.percent === newPercent)
            return;

        // Delay updating the visual status to prevent flicker
        timer.interval = (newPercent < root.percent) ? 500 : 0;

        root.percent = newPercent;
        root.text = newText;
        root.grueOpacity = newOpacity;

        timer.start()
    }

    Timer {
        id: timer
        running: false
        repeat: false
        onTriggered: {
            text.text = root.text
            grueimg.opacity = root.grueOpacity
        }
    }

    GrueSensor {
        id: sensor
        active: true
        onReadingChanged: {
            var percent = reading.chanceOfBeingEaten;
            if (percent === 0) {
                updateStatus(percent, 0.0, "It is light.<br>You are safe from Grues.");
            }
            else if (percent === 100) {
                updateStatus(percent, 1.0, "You have been eaten by a Grue!");
                sensor.active = false;
            }
            else if (percent > 0) {
                updateStatus(percent, 0.05 + (percent * 0.001),
                             "It is dark.<br>You are " + percent +" % " +
                             "likely to be eaten by a Grue.");
            }
        }
    }

    Text {
        id: text
        anchors.top: parent.top
        anchors.topMargin: 0
        anchors.left: parent.left
        anchors.right: parent.right
        wrapMode: Text.WordWrap
        text: "I can't tell if you're going to be eaten by a Grue or not. You're on your own!"
        font.pixelSize: 30
        color: "lightgray"
    }

    Image {
        id: grueimg
        anchors.bottom: parent.bottom
        anchors.horizontalCenter: parent.horizontalCenter
        source: "grue.png"
        opacity: 0.0
        Behavior on opacity { PropertyAnimation { duration: 250 } }
    }
}