main.qml Example File

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  import QtQuick 2.0
  import QtQuick.Scene3D 2.0
  import QtQuick.Layouts 1.2
  import QtMultimedia 5.0

  Item {
      id: mainview
      width: 1215
      height: 720
      visible: true
      property bool isHoverEnabled: false

      property variant magnitudeArray: null
      property int millisecondsPerBar: 68
      property string magnitudeDataSourceFile: "qrc:/music/visualization.raw"
      property int mediaLatencyOffset: 68

      state: "stopped"
      states: [
          State {
              name: "playing"
              PropertyChanges {
                  target: playButtonImage
                  source: {
                      if (playButtonMouseArea.containsMouse)
                          "qrc:/images/pausehoverpressed.png"
                      else
                          "qrc:/images/pausenormal.png"
                  }
              }
              PropertyChanges {
                  target: stopButtonImage
                  source: "qrc:/images/stopnormal.png"
              }
          },
          State {
              name: "paused"
              PropertyChanges {
                  target: playButtonImage
                  source: {
                      if (playButtonMouseArea.containsMouse)
                          "qrc:/images/playhoverpressed.png"
                      else
                          "qrc:/images/playnormal.png"
                  }
              }
              PropertyChanges {
                  target: stopButtonImage
                  source: "qrc:/images/stopnormal.png"
              }
          },
          State {
              name: "stopped"
              PropertyChanges {
                  target: playButtonImage
                  source: "qrc:/images/playnormal.png"
              }
              PropertyChanges {
                  target: stopButtonImage
                  source: "qrc:/images/stopdisabled.png"
              }
          }
      ]

      Component.onCompleted: isHoverEnabled = touchSettings.isHoverEnabled()

      MediaPlayer {
          id: mediaPlayer
          autoPlay: true
          volume: 0.5
          source: "qrc:/music/tiltshifted_lost_neon_sun.mp3"

          onStatusChanged: {
              if (status == MediaPlayer.EndOfMedia) //{
                  state = "stopped"
          }

          onError: console.error("error with audio " + mediaPlayer.error)

          onDurationChanged: {
              // Load the pre-calculated magnitude data for the visualizer
              var request = new XMLHttpRequest()
              request.responseType = 'arraybuffer'
              request.onreadystatechange = function() {
                      if (request.readyState === XMLHttpRequest.DONE) {
                          if (request.status == 200 || request.status == 0) {
                              var arrayBuffer = request.response
                              if (arrayBuffer) {
                                  magnitudeArray = new Uint16Array(arrayBuffer)
                                  visualizer.startVisualization()
                                }
                          } else {
                              console.warn("Couldn't load magnitude data for bars.")
                          }
                          request = null
                      }
                  };

              request.open('GET', magnitudeDataSourceFile, true)
              request.send(null)
          }

          function getNextAudioLevel(offsetMs) {
              if (magnitudeArray === null)
                  return 0.0;

              // Calculate the integer index position in to the magnitude array
              var index = ((mediaPlayer.position + offsetMs) /
                           mainview.millisecondsPerBar) | 0;

              if (index < 0 || index >= magnitudeArray.length)
                  return 0.0;

              return (magnitudeArray[index] / 63274.0);
          }
      }

      Image {
          id: coverImage
          anchors.fill: parent
          source: "qrc:/images/albumcover.png"
      }

      Scene3D {
          anchors.fill: parent

          Visualizer {
              id: visualizer
              animationState: mainview.state
              numberOfBars: 120
              barRotationTimeMs: 8160 // 68 ms per bar
          }
      }

      Rectangle {
          id: blackBottomRect
          color: "black"
          width: parent.width
          height: 0.14 * mainview.height
          anchors.bottom: parent.bottom
      }

      // Duration of played content
      Text {
          text: formatDuration(mediaPlayer.position)
          color: "#80C342"
          x: parent.width / 6
          y: mainview.height - mainview.height / 8
          font.pixelSize: 12
      }

      // Duration of the content left
      Text {
          text: "-" + formatDuration(mediaPlayer.duration - mediaPlayer.position)
          color: "#80C342"
          x: parent.width - parent.width / 6
          y: mainview.height - mainview.height / 8
          font.pixelSize: 12
      }

      function formatDuration(milliseconds) {
          var minutes = Math.floor(milliseconds / 60000)
          milliseconds -= minutes * 60000
          var seconds = milliseconds / 1000
          seconds = Math.round(seconds)
          if (seconds < 10)
              return minutes + ":0" + seconds
          else
              return minutes + ":" + seconds
      }

      property int buttonHorizontalMargin: 10
      Rectangle {
          id: playButton
          height: 54
          width: 54
          anchors.bottom: parent.bottom
          anchors.bottomMargin: width
          x: parent.width / 2 - width - buttonHorizontalMargin
          color: "transparent"

          Image {
              id: playButtonImage
              source: "qrc:/images/pausenormal.png"
          }

          MouseArea {
              id: playButtonMouseArea
              anchors.fill: parent
              hoverEnabled: isHoverEnabled
              onClicked: {
                  if (mainview.state == 'paused' || mainview.state == 'stopped')
                      mainview.state = 'playing'
                  else
                      mainview.state = 'paused'
              }
              onEntered: {
                  if (mainview.state == 'playing')
                      playButtonImage.source = "qrc:/images/pausehoverpressed.png"
                  else
                      playButtonImage.source = "qrc:/images/playhoverpressed.png"
              }
              onExited: {
                  if (mainview.state == 'playing')
                      playButtonImage.source = "qrc:/images/pausenormal.png"
                  else
                      playButtonImage.source = "qrc:/images/playnormal.png"
              }
          }
      }

      Rectangle {
          id: stopButton
          height: 54
          width: 54
          anchors.bottom: parent.bottom
          anchors.bottomMargin: width
          x: parent.width / 2 + buttonHorizontalMargin
          color: "transparent"

          Image {
              id: stopButtonImage
              source: "qrc:/images/stopnormal.png"
          }

          MouseArea {
              anchors.fill: parent
              hoverEnabled: isHoverEnabled
              onClicked: mainview.state = 'stopped'
              onEntered: {
                  if (mainview.state != 'stopped')
                      stopButtonImage.source = "qrc:/images/stophoverpressed.png"
              }
              onExited: {
                  if (mainview.state != 'stopped')
                      stopButtonImage.source = "qrc:/images/stopnormal.png"
              }
          }
      }
  }