view widgets/SubdividingMenu.h @ 473:4f4f943bfdfc

* Merge from one-fftdataserver-per-fftmodel branch.  This bit of
reworking (which is not described very accurately by the title of
the branch) turns the MatrixFile object into something that either
reads or writes, but not both, and separates the FFT file cache
reader and writer implementations separately.  This allows the
FFT data server to have a single thread owning writers and one reader
per "customer" thread, and for all locking to be vastly simplified
and concentrated in the data server alone (because none of the
classes it makes use of is used in more than one thread at a time).
The result is faster and more trustworthy code.

/* -*- 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 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 _SUBDIVIDING_MENU_H_
#define _SUBDIVIDING_MENU_H_

#include <QMenu>

#include <QString>
#include <set>
#include <map>

/**
 * A menu that divides its entries into submenus, alphabetically.  For
 * menus that may contain a very large or small number of named items
 * (e.g. plugins).
 *
 * The menu needs to be told, before any of the actions are added,
 * what the set of entry strings will be, so it can determine a
 * reasonable categorisation.  Do this by calling the setEntries()
 * method.  If it isn't practical to do this in advance, then add the
 * entries and call entriesAdded() afterwards instead. 
 */

class SubdividingMenu : public QMenu
{
    Q_OBJECT

public:
    SubdividingMenu(size_t lowerLimit = 0, size_t upperLimit = 0,
                    QWidget *parent = 0);
    SubdividingMenu(const QString &title, size_t lowerLimit = 0,
                    size_t upperLimit = 0, QWidget *parent = 0);
    virtual ~SubdividingMenu();

    void setEntries(const std::set<QString> &entries);
    void entriesAdded();

    // Action names and strings passed to addAction and addMenu must
    // appear in the set previously given to setEntries.  If you want
    // to use a different string, use the two-argument method and pass
    // the entry string (used to determine which submenu the action
    // ends up on) as the first argument.

    virtual void addAction(QAction *);
    virtual QAction *addAction(const QString &);
    virtual void addAction(const QString &entry, QAction *);
    
    virtual void addMenu(QMenu *);
    virtual QMenu *addMenu(const QString &);
    virtual void addMenu(const QString &entry, QMenu *);

protected:
    std::map<QString, QMenu *> m_nameToChunkMenuMap;

    size_t m_lowerLimit;
    size_t m_upperLimit;

    bool m_entriesSet;
    std::map<QString, QObject *> m_pendingEntries;
};

#endif