annotate widgets/SubdividingMenu.h @ 1127:9fb8dfd7ce4c spectrogram-minor-refactor

Fix threshold in spectrogram -- it wasn't working in the last release.
There is a new protocol for this. Formerly the threshold parameter had a
range from -50dB to 0 with the default at -50, and -50 treated internally
as "no threshold". However, there was a hardcoded, hidden internal threshold
for spectrogram colour mapping at -80dB with anything below this being rounded
to zero. Now the threshold parameter has range -81 to -1 with the default
at -80, -81 is treated internally as "no threshold", and there is no hidden
internal threshold. So the default behaviour is the same as before, an
effective -80dB threshold, but it is now possible to change this in both
directions. Sessions reloaded from prior versions may look slightly different
because, if the session says there should be no threshold, there will now
actually be no threshold instead of having the hidden internal one.

Still need to do something in the UI to make it apparent that the -81dB
setting removes the threshold entirely. This is at least no worse than the
previous, also obscured, magic -50dB setting.

/* -*- 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(int lowerLimit = 0, int upperLimit = 0,
                    QWidget *parent = 0);
    SubdividingMenu(const QString &title, int lowerLimit = 0,
                    int 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;

    int m_lowerLimit;
    int m_upperLimit;

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

#endif