1 | /**************************************************************************** |
---|---|
2 | ** |
3 | ** Copyright (C) 2016 The Qt Company Ltd. |
4 | ** Contact: https://www.qt.io/licensing/ |
5 | ** |
6 | ** This file is part of the test suite of the Qt Toolkit. |
7 | ** |
8 | ** $QT_BEGIN_LICENSE:GPL-EXCEPT$ |
9 | ** Commercial License Usage |
10 | ** Licensees holding valid commercial Qt licenses may use this file in |
11 | ** accordance with the commercial license agreement provided with the |
12 | ** Software or, alternatively, in accordance with the terms contained in |
13 | ** a written agreement between you and The Qt Company. For licensing terms |
14 | ** and conditions see https://www.qt.io/terms-conditions. For further |
15 | ** information use the contact form at https://www.qt.io/contact-us. |
16 | ** |
17 | ** GNU General Public License Usage |
18 | ** Alternatively, this file may be used under the terms of the GNU |
19 | ** General Public License version 3 as published by the Free Software |
20 | ** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT |
21 | ** included in the packaging of this file. Please review the following |
22 | ** information to ensure the GNU General Public License requirements will |
23 | ** be met: https://www.gnu.org/licenses/gpl-3.0.html. |
24 | ** |
25 | ** $QT_END_LICENSE$ |
26 | ** |
27 | ****************************************************************************/ |
28 | |
29 | #include "incrementalmodel.h" |
30 | #include <QGuiApplication> |
31 | #include <QDebug> |
32 | |
33 | IncrementalModel::IncrementalModel(QObject *parent) |
34 | : QAbstractListModel(parent), count(0) |
35 | { |
36 | for (int i = 0; i < 100; ++i) |
37 | list.append(t: "Item "+ QString::number(i)); |
38 | } |
39 | |
40 | int IncrementalModel::rowCount(const QModelIndex & /* parent */) const |
41 | { |
42 | return count; |
43 | } |
44 | |
45 | QVariant IncrementalModel::data(const QModelIndex &index, int role) const |
46 | { |
47 | if (!index.isValid()) |
48 | return QVariant(); |
49 | |
50 | if (index.row() >= list.size() || index.row() < 0) |
51 | return QVariant(); |
52 | |
53 | if (role == Qt::DisplayRole) |
54 | return list.at(i: index.row()); |
55 | return QVariant(); |
56 | } |
57 | |
58 | bool IncrementalModel::canFetchMore(const QModelIndex & /* index */) const |
59 | { |
60 | if (count < list.size()) |
61 | return true; |
62 | else |
63 | return false; |
64 | } |
65 | |
66 | void IncrementalModel::fetchMore(const QModelIndex & /* index */) |
67 | { |
68 | int remainder = list.size() - count; |
69 | int itemsToFetch = qMin(a: 5, b: remainder); |
70 | |
71 | beginInsertRows(parent: QModelIndex(), first: count, last: count+itemsToFetch-1); |
72 | |
73 | count += itemsToFetch; |
74 | |
75 | endInsertRows(); |
76 | } |
77 |