src/settingsview/components/SettingParaCombobox.qml

/*
 * Copyright (C) 2019-2020 by Savoir-faire Linux
 * Author: Yang Wang   <yang.wang@savoirfairelinux.com>
 *
 * 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 2.15
import QtQuick.Window 2.15
import QtQuick.Controls 2.15
import QtQuick.Controls.Universal 2.12
import QtQuick.Layouts 1.3
import QtGraphicalEffects 1.14
import QtQuick.Controls.Styles 1.4

ComboBox {
    id: control

    delegate: ItemDelegate {
        width: control.width
        contentItem: Text {
            text: {
                var currentItem = control.delegateModel.items.get(index)
                return  currentItem.model[control.textRole].toString()
            }
            color: "black"
            font: control.font
            elide: Text.ElideRight
            verticalAlignment: Text.AlignVCenter
        }
        highlighted: control.highlightedIndex === index
    }

    indicator: Canvas {
        id: canvas
        x: control.width - width - control.rightPadding
        y: control.topPadding + (control.availableHeight - height) / 2
        width: 12
        height: 8
        contextType: "2d"

        Connections {
            target: control
            function onPressedChanged(){
                canvas.requestPaint()
            }
        }

        onPaint: {
            context.reset();
            context.moveTo(0, 0);
            context.lineTo(width, 0);
            context.lineTo(width / 2, height);
            context.closePath();
            context.fillStyle = control.pressed ? "#17a81a" : "#21be2b";
            context.fill();
        }
    }

    contentItem: Text {
        leftPadding: 0
        rightPadding: control.indicator.width + control.spacing

        text: control.displayText
        font: control.font
        color: "black"
        verticalAlignment: Text.AlignVCenter
        elide: Text.ElideRight
    }

    background: Rectangle {
        implicitWidth: 120
        implicitHeight: 40
        border.color: "white"
        border.width: control.visualFocus ? 2 : 1
        radius: 2
    }

    popup: Popup {
        y: control.height - 1
        width: control.width
        implicitHeight: contentItem.implicitHeight
        padding: 1

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

            ScrollIndicator.vertical: ScrollIndicator { }
        }

        background: Rectangle {
            border.color: "gray"
            radius: 2
        }
    }
}