view base/RecentFiles.h @ 490:c3fb8258e34d

* Make it possible to import an entire session from an RDF document.
  However, at the moment the timings of events appear to be constrained
  by how far the audio decoder has got through its audio file at the
  time the event is queried -- need to investigate.

/* -*- 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 2006 Chris Cannam.
    
    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 _RECENT_FILES_H_
#define _RECENT_FILES_H_

#include <QObject>
#include <QString>
#include <vector>
#include <deque>

/**
 * RecentFiles manages a list of the names of recently-used objects,
 * saving and restoring that list via QSettings.  The names do not
 * actually have to refer to files.
 */

class RecentFiles : public QObject
{
    Q_OBJECT

public:
    /**
     * Construct a RecentFiles object that saves and restores in the
     * given QSettings group and truncates when the given count of
     * strings is reached.
     */
    RecentFiles(QString settingsGroup = "RecentFiles", size_t maxCount = 10);

    virtual ~RecentFiles();

    QString getSettingsGroup() const { return m_settingsGroup; }

    int getMaxCount() const { return m_maxCount; }

    std::vector<QString> getRecent() const;

    /**
     * Add a name that should be treated as a literal string.
     */
    void add(QString name);
    
    /**
     * Add a name that is known to be either a file path or a URL.  If
     * it looks like a URL, add it literally; otherwise treat it as a
     * file path and canonicalise it appropriately.  Also takes into
     * account the user preference for whether to include temporary
     * files in the recent files menu: the file will not be added if
     * the preference is set and the file appears to be a temporary
     * one.
     */
    void addFile(QString name);

signals:
    void recentChanged();

protected:
    QString m_settingsGroup;
    size_t m_maxCount;

    std::deque<QString> m_names;

    void read();
    void write();
    void truncateAndWrite();
};

#endif