annotate data/fileio/RemoteFile.h @ 211:e2bbb58e6df6

Several changes related to referring to remote URLs for sessions and files:
* Pull file dialog wrapper functions out from MainWindow into FileFinder
* If a file referred to in a session is not found at its expected location,
  try a few other alternatives (same location as the session file or same
  location as the last audio file) before asking the user to locate it
* Allow user to give a URL when locating an audio file, not just locate on
  the filesystem
* Make wave file models remember the "original" location (e.g. URL) of
  the audio file, not just the actual location from which the data was
  loaded (e.g. local copy of that URL) -- when saving a session, use the
  original location so as not to refer to a temporary file
* Clean up incompletely-downloaded local copies of files

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2007 QMUL.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef _REMOTE_FILE_H_
#define _REMOTE_FILE_H_

#include <QUrl>
#include <QMutex>
#include <QString>
#include <QTimer>

class QFtp;
class QHttp;
class QFile;
class QProgressDialog;
class QHttpResponseHeader;

class RemoteFile : public QObject
{
    Q_OBJECT

public:
    RemoteFile(QUrl url);
    virtual ~RemoteFile();

    bool isAvailable();

    void wait();

    bool isOK() const;
    bool isDone() const;

    QString getLocalFilename() const;
    QString getErrorString() const;

    void deleteLocalFile();

    static bool canHandleScheme(QUrl url);

signals:
    void progress(int percent);
    void ready();

protected slots:
    void dataReadProgress(int done, int total);
    void responseHeaderReceived(const QHttpResponseHeader &resp);
    void dataTransferProgress(qint64 done, qint64 total);
    void done(bool error);
    void showProgressDialog();
    void cancelled();

protected:
    QFtp *m_ftp;
    QHttp *m_http;
    QFile *m_localFile;
    QString m_localFilename;
    QString m_errorString;
    bool m_ok;
    int m_lastStatus;
    bool m_done;
    QProgressDialog *m_progressDialog;
    QTimer m_progressShowTimer;

    void cleanup();

    QString createLocalFile(QUrl url);

    static QMutex m_fileCreationMutex;
    static int m_count;
};

#endif