styles/org.kde.desktop/TreeViewDecoration.qml

//  SPDX-FileCopyrightText: 2020 Marco Martin <mart@kde.org>
//  SPDX-License-Identifier: LGPL-2.0-or-later
 
import QtQuick 2.6
import QtQuick.Layouts 1.4
import QtQuick.Controls 2.2 as QQC2
import QtQuick.Templates 2.2 as T2
import org.kde.kitemmodels 1.0
import org.kde.qqc2desktopstyle.private as StylePrivate
 
RowLayout {
    required property int index
    required property int kDescendantLevel
    required property var kDescendantHasSiblings
    required property bool kDescendantExpandable
    required property bool kDescendantExpanded
    required property T2.ItemDelegate parentDelegate
    required property KDescendantsProxyModel model
 
    Layout.topMargin: -parentDelegate.topPadding
    Layout.bottomMargin: -parentDelegate.bottomPadding
 
    Repeater {
        model: kDescendantLevel - 1
        delegate: StylePrivate.StyleItem {
            Layout.preferredWidth: controlRoot.width
            Layout.fillHeight: true
            visible: true
            elementType: "itembranchindicator"
            properties: {
                "isItem": false,
                "hasSibling": kDescendantHasSiblings[modelData]
            }
        }
    }
 
    T2.Button {
        id: controlRoot
        Layout.preferredWidth: contentItem.pixelMetric("treeviewindentation")
        Layout.fillHeight: true
        enabled: kDescendantExpandable
        onClicked: model.toggleChildren(index)
        contentItem: StylePrivate.StyleItem {
            id: styleitem
            control: controlRoot
            hover: controlRoot.hovered
            elementType: "itembranchindicator"
            on: kDescendantExpanded
            properties: {
                "isItem": true,
                "hasChildren": kDescendantExpandable,
                "hasSibling": kDescendantHasSiblings[kDescendantHasSiblings.length - 1]
            }
        }
        background: null
    }
}