Content.qml Example File

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  import QtQuick 2.1

  Rectangle {
      id: root
      property alias effect: effectLoader.item
      property alias gripSize: divider.gripSize
      property string effectSource
      property real volume: 0.5

      signal videoFramePainted

      Divider {
          id: divider
          visible: false
          z: 1.0
          onValueChanged: updateDivider()
      }

      ShaderEffectSource {
          id: theSource
          smooth: true
          hideSource: true
      }

      Loader {
          id: contentLoader
      }

      Loader {
          id: effectLoader
          source: effectSource
      }

      Connections {
          id: videoFramePaintedConnection
          onFramePainted: {
              if (performanceLoader.item)
                 root.videoFramePainted()
          }
          ignoreUnknownSignals: true
      }

      onWidthChanged: {
          if (effectLoader.item)
              effectLoader.item.targetWidth = root.width
      }

      onHeightChanged: {
          if (effectLoader.item)
              effectLoader.item.targetHeight = root.height
      }

      onEffectSourceChanged: {
          effectLoader.source = effectSource
          effectLoader.item.parent = root
          effectLoader.item.targetWidth = root.width
          effectLoader.item.targetHeight = root.height
          updateSource()
          effectLoader.item.source = theSource
          divider.visible = effectLoader.item.divider
          updateDivider()
      }

      function init() {
          openImage("qrc:/images/qt-logo.png")
          root.effectSource = "EffectPassThrough.qml"
      }

      function updateDivider() {
          if (effectLoader.item && effectLoader.item.divider)
              effectLoader.item.dividerValue = divider.value
      }

      function updateSource() {
          if (contentLoader.item) {
              contentLoader.item.parent = root
              contentLoader.item.anchors.fill = root
              theSource.sourceItem = contentLoader.item
              if (effectLoader.item)
                  effectLoader.item.anchors.fill = contentLoader.item
          }
      }

      function openImage(path) {
          stop()
          contentLoader.source = "ContentImage.qml"
          videoFramePaintedConnection.target = null
          contentLoader.item.source = path
          updateSource()
      }

      function openVideo(path) {
          stop()
          contentLoader.source = "ContentVideo.qml"
          videoFramePaintedConnection.target = contentLoader.item
          contentLoader.item.mediaSource = path
          contentLoader.item.volume = volume
          contentLoader.item.play()
          updateSource()
      }

      function openCamera() {
          stop()
          contentLoader.source = "ContentCamera.qml"
          videoFramePaintedConnection.target = contentLoader.item
          updateSource()
      }

      function stop() {
          if (contentLoader.source == "ContentVideo.qml")
              contentLoader.item.stop()
          theSource.sourceItem = null
      }
  }