ComboBoxStyle.qml

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

Style {
    readonly property ComboBox control: __control
    property Component panel: Item {
        property bool popup: !!styleItem.styleHint("comboboxpopup")

        implicitWidth: 115
        implicitHeight: styleItem.implicitHeight
        anchors.fill: parent
        StyleItem {
            id: styleItem

            height: parent.height
            width: parent.width
            elementType: "combobox"
            sunken: control.pressed
            raised: !sunken
            hover: control.__containsMouse
            enabled: control.enabled
            // The style makes sure the text rendering won't overlap the decoration.
            // In that case, 35 pixels margin in this case looks good enough. Worst
            // case, the ellipsis will be truncated (2nd worst, not visible at all).
            text: elidedText(control.currentText, Text.ElideRight, parent.width - 35)
            hasFocus: control.activeFocus
            // contentHeight as in QComboBox
            contentHeight: Math.max(Math.ceil(textHeight("")), 14) + 2