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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Quick Designer Components.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.12
+
+QtObject {
+ id: list
+ property Item intialItem
+ //has next prev and most likely currentIndex, count
+ property var items
+
+ property Item nextItem
+ property Item prevItem
+
+ property Item currentItem
+
+ onCurrentItemChanged: {
+
+ var currentIndex = list.__indexForCurrentItem()
+
+ if (currentIndex < (list.items.length - 1))
+ list.nextItem = list.items[currentIndex + 1]
+ if (currentIndex > 0)
+ list.prevItem = list.items[currentIndex - 1]
+
+ }
+
+ function __indexForCurrentItem() {
+ var currentIndex = -1
+ for (var i = 0; i < list.items.length; ++i) {
+ var item = list.items[i]
+ if (item === list.currentItem)
+ currentIndex = i
+ }
+ return currentIndex
+ }
+
+ property int length: items.length
+
+ function next() {
+ var currentIndex = list.__indexForCurrentItem()
+
+ list.nextItem = null
+
+ if (currentIndex > -1 && (currentIndex < list.items.length - 1)) {
+ list.prevItem = list.items[currentIndex]
+ list.currentItem = list.items[currentIndex + 1]
+ if (currentIndex + 2 < list.items.length)
+ list.nextItem = list.items[currentIndex + 2]
+ }
+ }
+
+ function prev() {
+ var currentIndex = list.__indexForCurrentItem()
+
+ list.prevItem = null
+
+ if (currentIndex > 0 && currentIndex < (list.items.length)) {
+ if (currentIndex - 2 >= 0)
+ list.prevItem = list.items[currentIndex - 2]
+ list.currentItem = list.items[currentIndex - 1]
+
+ list.nextItem = list.items[currentIndex]
+ }
+ }
+
+ Component.onCompleted: {
+ list.currentItem = list.intialItem
+ var currentIndex = list.__indexForCurrentItem()
+ if (currentIndex < (list.items.length - 1))
+ list.nextItem = list.items[currentIndex + 1]
+ if (currentIndex > 0)
+ list.prevItem = list.items[currentIndex - 1]
+ }
+}