Mega Code Archive
Extends QAbstractListModel to create file list model
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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef FILELISTMODEL_H
#define FILELISTMODEL_H
#include <QAbstractListModel>
#include <QList>
#include <QStringList>
class FileListModel : public QAbstractListModel
{
Q_OBJECT
public:
FileListModel(QObject *parent = 0);
int rowCount(const QModelIndex &parent = QModelIndex()) const;
QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
signals:
void numberPopulated(int number);
public slots:
void setDirPath(const QString &path);
protected:
bool canFetchMore(const QModelIndex &parent) const;
void fetchMore(const QModelIndex &parent);
private:
QStringList fileList;
int fileCount;
};
#endif
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "filelistmodel.h"
#include <QApplication>
#include <QPalette>
#include <QBrush>
#include <QDir>
FileListModel::FileListModel(QObject *parent)
: QAbstractListModel(parent)
{
}
int FileListModel::rowCount(const QModelIndex & /* parent */) const
{
return 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();
}
bool FileListModel::canFetchMore(const QModelIndex & /* index */) const
{
if (fileCount < fileList.size())
return true;
else
return false;
}
void FileListModel::fetchMore(const QModelIndex & /* index */)
{
int remainder = fileList.size() - fileCount;
int itemsToFetch = qMin(100, remainder);
beginInsertRows(QModelIndex(), fileCount, fileCount+itemsToFetch);
fileCount += itemsToFetch;
endInsertRows();
emit numberPopulated(itemsToFetch);
}
void FileListModel::setDirPath(const QString &path)
{
QDir dir(path);
fileList = dir.entryList();
fileCount = 0;
reset();
}
#ifndef WINDOW_H
#define WINDOW_H
#include <QWidget>
QT_BEGIN_NAMESPACE
class QTextBrowser;
QT_END_NAMESPACE
class Window : public QWidget
{
Q_OBJECT
public:
Window(QWidget *parent = 0);
public slots:
void updateLog(int number);
private:
QTextBrowser *logViewer;
};
#endif
#include <QtGui>
#include "filelistmodel.h"
#include "window.h"
Window::Window(QWidget *parent)
: QWidget(parent)
{
FileListModel *model = new FileListModel(this);
model->setDirPath(QLibraryInfo::location(QLibraryInfo::PrefixPath));
QLabel *label = new QLabel(tr("&Directory:"));
QLineEdit *lineEdit = new QLineEdit;
label->setBuddy(lineEdit);
QListView *view = new QListView;
view->setModel(model);
logViewer = new QTextBrowser;
logViewer->setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred));
connect(lineEdit, SIGNAL(textChanged(const QString &)),
model, SLOT(setDirPath(const QString &)));
connect(lineEdit, SIGNAL(textChanged(const QString &)),
logViewer, SLOT(clear()));
connect(model, SIGNAL(numberPopulated(int)),
this, SLOT(updateLog(int)));
QGridLayout *layout = new QGridLayout;
layout->addWidget(label, 0, 0);
layout->addWidget(lineEdit, 0, 1);
layout->addWidget(view, 1, 0, 1, 2);
layout->addWidget(logViewer, 2, 0, 1, 2);
setLayout(layout);
setWindowTitle(tr("Fetch More Example"));
}
void Window::updateLog(int number)
{
logViewer->append(tr("%1 items added.").arg(number));
}
#include <QApplication>
#include "window.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Window window;
window.show();
return app.exec();
}
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