BreadcrumbControl.qml

/*
 *   Copyright 2018 Marco Martin <mart@kde.org>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as
 *   published by the Free Software Foundation; either version 2 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 Library General Public License for more details
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this program; if not, write to the
 *   Free Software Foundation, Inc.,
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

import QtQuick 2.5
import QtQuick.Controls 2.0 as Controls
import QtQuick.Layouts 1.2
import org.kde.kirigami 2.4 as Kirigami



Flickable {
    id: root

    property Kirigami.PageRow pageRow: parent.pageRow

    contentHeight: height
    contentWidth: mainLayout.width
    clip: true
    boundsBehavior: Flickable.StopAtBounds

    Connections {
        target: pageRow
        onCurrentIndexChanged: {
            var currentItem = mainLayout.children[pageRow.currentIndex];
            listScrollAnim.running = false
            listScrollAnim.from = root.contentX;
            listScrollAnim.to = Math.max( 0,
                    Math.min(currentItem.x + currentItem.width/2 - root.width/2,
                    root.contentWidth - root.width))
            listScrollAnim.running = true;
        }
    }

    RowLayout {
        id: mainLayout
        height: parent.height
        Repeater {
            id: mainRepeater
            model: pageRow.depth
            delegate: MouseArea {
                Layout.preferredWidth: delegateLayout.implicitWidth
                Layout.fillHeight: true
                onClicked: pageRow.currentIndex = modelData;
                RowLayout {
                    id: delegateLayout
                    anchors.fill: parent
                    readonly property Kirigami.Page page: pageRow.get(modelData)
                    spacing: 0

                    Kirigami.Icon {
                        visible: modelData > 0
                        Layout.alignment: Qt.AlignVCenter
                        Layout.preferredHeight: Kirigami.Units.iconSizes.small
                        Layout.preferredWidth: Layout.preferredHeight
                        isMask: true
                        color: Kirigami.Theme.textColor
                        source: LayoutMirroring.enabled ? "go-next-symbolic-rtl" : "go-next-symbolic"
                    }
                    Kirigami.Heading {
                        Layout.leftMargin: Kirigami.Units.largeSpacing
                        font.pointSize: -1
                        font.pixelSize: Math.max(1, mainLayout.height * 0.6)
                        color: Kirigami.Theme.textColor
                        verticalAlignment: Text.AlignVCenter
                        wrapMode: Text.NoWrap
                        text: delegateLayout.page ? delegateLayout.page.title : ""
                        opacity: modelData == pageRow.currentIndex ? 1 : 0.4
                    }
                }
            }
        }
    }

    NumberAnimation {
        id: listScrollAnim
        target: root
        property: "contentX"
        duration: Kirigami.Units.longDuration
        easing.type: Easing.InOutQuad
    }
}