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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 } }
     }
 }