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28
29#include "incrementalmodel.h"
30#include <QGuiApplication>
31#include <QDebug>
32
33IncrementalModel::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
40int IncrementalModel::rowCount(const QModelIndex & /* parent */) const
41{
42 return count;
43}
44
45QVariant 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
58bool IncrementalModel::canFetchMore(const QModelIndex & /* index */) const
59{
60 if (count < list.size())
61 return true;
62 else
63 return false;
64}
65
66void 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

source code of qtdeclarative/tests/auto/quick/qquicklistview/incrementalmodel.cpp