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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include "filelistmodel.h"
++
++ #include <QGuiApplication>
++ #include <QDir>
++ #include <QPalette>
++
++ static const int batchSize = 100;
++
++ FileListModel::FileListModel(QObject *parent)
++ : QAbstractListModel(parent)
++ {}
++
++ //![4]
++ int FileListModel::rowCount(const QModelIndex &parent) const
++ {
++ return parent.isValid() ? 0 : fileCount;
++ }
++
++ QVariant FileListModel::data(const QModelIndex &index, int role) const
++ {
++ if (!index.isValid())
++ return {};
++
++ const int row = index.row();
++ if (row >= fileList.size() || row < 0)
++ return {};
++
++ switch (role) {
++ case Qt::DisplayRole:
++ return fileList.at(row).fileName();
++ case Qt::BackgroundRole: {
++ const int batch = row / batchSize;
++ const QPalette &palette = QGuiApplication::palette();
++ return (batch % 2) != 0 ? palette.alternateBase() : palette.base();
++ }
++ case Qt::DecorationRole:
++ return iconProvider.icon(fileList.at(row));
++ }
++ return {};
++ }
++
++ //![4]
++
++ QFileInfo FileListModel::fileInfoAt(const QModelIndex &index) const
++ {
++ return fileList.at(index.row());
++ }
++
++ //![1]
++ bool FileListModel::canFetchMore(const QModelIndex &parent) const
++ {
++ if (parent.isValid())
++ return false;
++ return (fileCount < fileList.size());
++ }
++ //![1]
++
++ //![2]
++ void FileListModel::fetchMore(const QModelIndex &parent)
++ {
++ if (parent.isValid())
++ return;
++ const int start = fileCount;
++ const int remainder = int(fileList.size()) - start;
++ const int itemsToFetch = qMin(batchSize, remainder);
++
++ if (itemsToFetch <= 0)
++ return;
++
++ beginInsertRows(QModelIndex(), start, start + itemsToFetch - 1);
++
++ fileCount += itemsToFetch;
++
++ endInsertRows();
++
++ emit numberPopulated(path, start, itemsToFetch, int(fileList.size()));
++ }
++ //![2]
++
++ //![0]
++ void FileListModel::setDirPath(const QString &path)
++ {
++ QDir dir(path);
++
++ beginResetModel();
++ this->path = path;
++ fileList = dir.entryInfoList(QDir::NoDot | QDir::AllEntries, QDir::Name);
++ fileCount = 0;
++ endResetModel();
++ }
++ //![0]
++