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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+** * Redistributions of source code must retain the above copyright
+** notice, this list of conditions and the following disclaimer.
+** * Redistributions in binary form must reproduce the above copyright
+** notice, this list of conditions and the following disclaimer in
+** the documentation and/or other materials provided with the
+** distribution.
+** * Neither the name of The Qt Company Ltd nor the names of its
+** contributors may be used to endorse or promote products derived
+** from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+import QtQuick 2.4
+
+Item {
+ width: 500
+ height: 160
+ visible: true
+
+ property var model1: ["1","2","3","4","5","6","7","8","9","10",
+ "11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30",
+ "31","32","33","34","a"]
+ property var model2: ["a","b","c","d","e","f","g","h","i","j","k","l","m","1"]
+ property bool useModel1: true
+
+ function changeModel() {
+ useModel1 = !useModel1
+ grid.loadModel(useModel1 ? model1 : model2)
+ }
+
+ function scrollToTop() {
+ grid.contentY = grid.originY;
+ }
+
+ GridView {
+ id: grid
+ anchors.fill: parent
+
+ model: ListModel {
+ }
+
+ onCurrentIndexChanged: {
+ positionViewAtIndex(currentIndex, GridView.Contain)
+ }
+
+ Component.onCompleted: {
+ loadModel(model1)
+ grid.currentIndex = 34
+ grid.positionViewAtIndex(34, GridView.Contain)
+ }
+
+ function loadModel(m) {
+ var remove = {};
+ var add = {};
+ var i;
+ for (i=0; i < model.count; ++i)
+ remove[model.get(i).name] = true;
+ for (i=0; i < m.length; ++i)
+ if (remove[m[i]])
+ delete remove[m[i]];
+ else
+ add[m[i]] = true;
+
+ for (i=model.count-1; i>= 0; --i)
+ if (remove[model.get(i).name])
+ model.remove(i, 1);
+
+ for (i=0; i<m.length; ++i)
+ if (add[m[i]])
+ model.insert(i, { "name": m[i] })
+ }
+
+ delegate: Rectangle {
+ height: grid.cellHeight
+ width: grid.cellWidth
+ color: GridView.isCurrentItem ? "gray" : "white"
+ Text {
+ anchors.fill: parent
+ text: name
+ }
+ MouseArea {
+ anchors.fill: parent
+ onClicked: {
+ grid.currentIndex = index
+ }
+ }
+ }
+ }
+}