Progress Bar

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 ** This file is part of the examples of the Qt Design Studio.
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 import QtQuick 2.9
 import QtQuick.Window 2.3
 import QtQuick.Timeline 1.0
 import QtQuick.Layouts 1.0
 import QtQuick.Controls 2.3

 Rectangle {
     visible: true
     width: 640
     height: 480
     color: "#242424"

     ColumnLayout {
         x: 20
         y: 152
         spacing: 20

         Root {
             id: root
         }

         Root {
             id: root1
         }

         Root {
             id: root2
         }
     }

     Timeline {
         id: timeline
         enabled: true
         endFrame: 4000
         startFrame: 0

         KeyframeGroup {
             target: root
             property: "progress"

             Keyframe {
                 value: 10
                 frame: 0
             }

             Keyframe {
                 easing.bezierCurve: [0.86, 0.00, 0.07, 1.00, 1, 1]
                 value: 90
                 frame: 2000
             }

             Keyframe {
                 easing.bezierCurve: [0.86, 0.00, 0.07, 1.00, 1, 1]
                 value: 10
                 frame: 4000
             }
         }

         KeyframeGroup {
             target: root1
             property: "progress"

             Keyframe {
                 easing.bezierCurve: [0.17, 0.84, 0.44, 1.00, 1, 1]
                 value: 90
                 frame: 4000
             }

             Keyframe {
                 easing.bezierCurve: [0.17, 0.84, 0.44, 1.00, 1, 1]
                 value: 20
                 frame: 2000
             }

             Keyframe {
                 value: 90
                 frame: 0
             }
         }

         KeyframeGroup {
             target: root2
             property: "progress"

             Keyframe {
                 value: 15
                 frame: 0
             }

             Keyframe {
                 easing.bezierCurve: [0.79, 0.14, 0.15, 0.86, 1, 1]
                 value: 85
                 frame: 2000
             }

             Keyframe {
                 easing.bezierCurve: [0.79, 0.14, 0.15, 0.86, 1, 1]
                 value: 15
                 frame: 4000
             }
         }

         animations: [
             TimelineAnimation {
                 id: propertyAnimation
                 target: timeline
                 property: "currentFrame"
                 running: true
                 to: timeline.endFrame
                 from: timeline.startFrame
                 loops: -1
                 duration: 1000
             }
         ]
     }

     Image {
         id: image
         x: 518
         y: 0
         width: 102
         height: 137
         fillMode: Image.PreserveAspectFit
         source: "built-with-Qt_Large.png"
     }
 }