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** Copyright (C) 2017 The Qt Company Ltd.
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** This file is part of the Qt Quick Controls 2 module of the Qt Toolkit.
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import QtQuick 2.12
import QtQuick.Templates 2.12 as T
import QtQuick.Controls.Imagine 2.12
import QtQuick.Controls.Imagine.impl 2.12

T.ScrollBar {
    id: control

    implicitWidth: Math.max(implicitBackgroundWidth + leftInset + rightInset,
                            implicitContentWidth + leftPadding + rightPadding)
    implicitHeight: Math.max(implicitBackgroundHeight + topInset + bottomInset,
                             implicitContentHeight + topPadding + bottomPadding)

    visible: control.policy !== T.ScrollBar.AlwaysOff
    minimumSize: orientation == Qt.Horizontal ? height / width : width / height

    topPadding: background ? background.topPadding : 0
    leftPadding: background ? background.leftPadding : 0
    rightPadding: background ? background.rightPadding : 0
    bottomPadding: background ? background.bottomPadding : 0

    topInset: background ? -background.topInset || 0 : 0
    leftInset: background ? -background.leftInset || 0 : 0
    rightInset: background ? -background.rightInset || 0 : 0
    bottomInset: background ? -background.bottomInset || 0 : 0

    contentItem: NinePatchImage {
        width: control.availableWidth
        height: control.availableHeight

        source: Imagine.url + "scrollbar-handle"
        NinePatchImageSelector on source {
            states: [
                {"vertical": control.vertical},
                {"horizontal": control.horizontal},
                {"disabled": !control.enabled},
                {"interactive": control.interactive},
                {"pressed": control.pressed},
                {"mirrored": control.mirrored},
                {"hovered": control.hovered}
            ]
        }
        opacity: 0.0
    }

    background: NinePatchImage {
        source: Imagine.url + "scrollbar-background"
        NinePatchImageSelector on source {
            states: [
                {"vertical": control.vertical},
                {"horizontal": control.horizontal},
                {"disabled": !control.enabled},
                {"interactive": control.interactive},
                {"pressed": control.pressed},
                {"mirrored": control.mirrored},
                {"hovered": control.hovered}
            ]
        }
        opacity: 0.0
    }

    states: [
        State {
            name: "active"
            when: control.policy === T.ScrollBar.AlwaysOn || (control.active && control.size < 1.0)
        }
    ]

    transitions: [
        Transition {
            to: "active"
            NumberAnimation { targets: [control.contentItem, control.background]; property: "opacity"; to: 1.0 }
        },
        Transition {
            from: "active"
            SequentialAnimation {
                PropertyAction{ targets: [control.contentItem, control.background]; property: "opacity"; value: 1.0 }
                PauseAnimation { duration: 3000 }
                NumberAnimation { targets: [control.contentItem, control.background]; property: "opacity"; to: 0.0 }
            }
        }
    ]
}