app/resources/qml/Components/FancyBusyIndicator.qml

/*
    blueROCK - for digital rock
    Copyright (C) 2019  Dorian Zedler

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

import QtQuick 2.3
import QtQuick.Controls 2.4
//import QtQuick.Controls.Styles 1.4

BusyIndicator {
    id: control

    property double animationSpeed: 1000
    property double formFactor: 4.5

    property color lineColor: "#21be2b"

    contentItem: Item {
        implicitWidth: 64
        implicitHeight: 64

        Item {
            id: item

            anchors.fill: parent

            property int currentHeight: 0

            SequentialAnimation {
                running: control.running
                loops: Animation.Infinite

                NumberAnimation {
                    target: item
                    property: "currentHeight"
                    from: 0
                    to: 800
                    duration: control.animationSpeed
                }
            }

            Row {

                anchors.fill: parent

                spacing: item.width / 9

                Repeater {
                    id: repeater
                    model: 5

                    Rectangle {

                        property double heightMultiplier: Math.abs( Math.sin( ( ((item.currentHeight/100) + (index*(control.formFactor/repeater.model)))) * (Math.PI/8) ) )

                        anchors.verticalCenter: parent.verticalCenter

                        width: item.width / 9
                        height: ( heightMultiplier ) * ( item.height - 1 ) + 1

                        radius: width * 0.5

                        color: control.lineColor

                    }
                }
            }
        }
    }
}