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** Copyright (C) 2020 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
import QtQuick.Window
import QtQuick.Controls
import QtQuick.Controls.impl
import QtQuick.Templates as T
import QtQuick.NativeStyle as NativeStyle

T.ComboBox {
    id: control

    readonly property bool __nativeBackground: background instanceof NativeStyle.StyleItem

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

    font.pixelSize: __nativeBackground ? background.styleFont(control).pixelSize : undefined

    leftPadding: __nativeBackground ? background.contentPadding.left : 5
    rightPadding: __nativeBackground ? background.contentPadding.right : 5
    topPadding: __nativeBackground ? background.contentPadding.top : 5
    bottomPadding: __nativeBackground ? background.contentPadding.bottom : 5

    topInset: __nativeBackground ? background.insets.top : 0
    bottomInset: __nativeBackground ? background.insets.bottom : 0
    leftInset: __nativeBackground ? background.insets.left : 0
    rightInset: __nativeBackground ? background.insets.right : 0

    contentItem: T.TextField {
        implicitWidth: contentWidth
        implicitHeight: contentHeight
        text: control.editable ? control.editText : control.displayText

        enabled: control.editable
        autoScroll: control.editable
        readOnly: control.down
        inputMethodHints: control.inputMethodHints
        validator: control.validator
        selectByMouse: control.selectTextByMouse

        font: control.font
        color: control.editable ? control.palette.text : control.palette.buttonText
        selectionColor: control.palette.highlight
        selectedTextColor: control.palette.highlightedText
        verticalAlignment: Text.AlignVCenter
    }

    background: NativeStyle.ComboBox {
        control: control
        contentWidth: contentItem.implicitWidth
        contentHeight: contentItem.implicitHeight
    }

    delegate: ItemDelegate {
        width: ListView.view.width
        text: control.textRole ? (Array.isArray(control.model) ? modelData[control.textRole] : model[control.textRole]) : modelData
        palette.text: control.palette.text
        palette.highlightedText: control.palette.highlightedText
        font.weight: control.currentIndex === index ? Font.DemiBold : Font.Normal
        highlighted: control.highlightedIndex === index
        hoverEnabled: control.hoverEnabled
    }

    popup: T.Popup {
        readonly property var layoutMargins: control.__nativeBackground ? control.background.layoutMargins : null
        x: layoutMargins ? layoutMargins.left : 0
        y: control.height - (layoutMargins ? layoutMargins.bottom : 0)
        width: control.width - (layoutMargins ? layoutMargins.left + layoutMargins.right : 0)
        height: Math.min(contentItem.implicitHeight, control.Window.height - topMargin - bottomMargin)
        topMargin: 6
        bottomMargin: 6

        contentItem: ListView {
            clip: true
            implicitHeight: contentHeight
            model: control.delegateModel
            currentIndex: control.highlightedIndex
            highlightMoveDuration: 0

            Rectangle {
                z: 10
                width: parent.width
                height: parent.height
                color: "transparent"
                border.color: control.palette.mid
            }

            T.ScrollIndicator.vertical: ScrollIndicator { }
        }

        background: Rectangle {
            color: control.palette.window
        }
    }
}