Qt 5.6 | Qt Sensors | Qt Sensors - Grue Sensor Example | grue.qml Example File

Qt 5.6.3 Reference Documentation

# grue.qml Example File

grue/grue.qml

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the QtSensors module of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** You may use this file under the terms of the BSD license as follows:
      **
      ** "Redistribution and use in source and binary forms, with or without
      ** modification, are permitted provided that the following conditions are
      ** met:
      **   * Redistributions of source code must retain the above copyright
      **     notice, this list of conditions and the following disclaimer.
      **   * Redistributions in binary form must reproduce the above copyright
      **     notice, this list of conditions and the following disclaimer in
      **     the documentation and/or other materials provided with the
      **     distribution.
      **   * Neither the name of The Qt Company Ltd nor the names of its
      **     contributors may be used to endorse or promote products derived
      **     from this software without specific prior written permission.
      **
      **
      ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      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 } }
          }
      }