ComboBoxStyle.qml

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import QtQuick 2.1
import QtQuick.Controls.Styles 1.0
import QtQuick.Controls.Private 1.0

Style {
    property Component panel: StyleItem {
        property int popup: styleHint("comboboxpopup")

        width: parent.width
        anchors.verticalCenter: parent.verticalCenter
        elementType: "combobox"
        sunken: control.__pressed
        raised: !sunken
        hover: control.__containsMouse
        enabled: control.enabled
        text: control.currentText
        hasFocus: control.activeFocus
        // contentHeight as in QComboBox
        contentHeight: Math.max(Math.ceil(textHeight("")), 14) + 2
        contentWidth: textWidth(text)
    }

    property Component popupStyle: MenuStyle {
        __menuItemType: "comboboxitem"
    }

    property Component dropDownStyle: Style {
        property Component frame: StyleItem {
            elementType: "frame"

            width: (parent ? parent.contentWidth : 0)