130 lines
4.0 KiB
C++
130 lines
4.0 KiB
C++
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2016 The Qt Company Ltd.
|
|
** Contact: https://www.qt.io/licensing/
|
|
**
|
|
** This file is part of the examples 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."
|
|
**
|
|
** $QT_END_LICENSE$
|
|
**
|
|
****************************************************************************/
|
|
|
|
#include "filelistmodel.h"
|
|
|
|
#include <QGuiApplication>
|
|
#include <QDir>
|
|
#include <QPalette>
|
|
|
|
FileListModel::FileListModel(QObject *parent)
|
|
: QAbstractListModel(parent), fileCount(0)
|
|
{}
|
|
|
|
//![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 QVariant();
|
|
|
|
if (index.row() >= fileList.size() || index.row() < 0)
|
|
return QVariant();
|
|
|
|
if (role == Qt::DisplayRole) {
|
|
return fileList.at(index.row());
|
|
} else if (role == Qt::BackgroundRole) {
|
|
int batch = (index.row() / 100) % 2;
|
|
if (batch == 0)
|
|
return qApp->palette().base();
|
|
else
|
|
return qApp->palette().alternateBase();
|
|
}
|
|
return QVariant();
|
|
}
|
|
//![4]
|
|
|
|
//![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;
|
|
int remainder = fileList.size() - fileCount;
|
|
int itemsToFetch = qMin(100, remainder);
|
|
|
|
if (itemsToFetch <= 0)
|
|
return;
|
|
|
|
beginInsertRows(QModelIndex(), fileCount, fileCount + itemsToFetch - 1);
|
|
|
|
fileCount += itemsToFetch;
|
|
|
|
endInsertRows();
|
|
|
|
emit numberPopulated(itemsToFetch);
|
|
}
|
|
//![2]
|
|
|
|
//![0]
|
|
void FileListModel::setDirPath(const QString &path)
|
|
{
|
|
QDir dir(path);
|
|
|
|
beginResetModel();
|
|
fileList = dir.entryList();
|
|
fileCount = 0;
|
|
endResetModel();
|
|
}
|
|
//![0]
|
|
|