presentation_info.h

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/*
 * Copyright (C) 2016-2017 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2016-2019 Robin Gareus <robin@gareus.org>
 * Copyright (C) 2018 Len Ovens <len@ovenwerks.net>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#ifndef __libardour_presentation_info_h__
#define __libardour_presentation_info_h__
 
#include <iostream>
#include <string>
 
#include <atomic>
#include <cstdint>
 
#include "pbd/signals.h"
#include "pbd/stateful.h"
#include "pbd/properties.h"
 
#include "ardour/libardour_visibility.h"
 
class XMLNode;
 
namespace ARDOUR {
 
namespace Properties {
        LIBARDOUR_API extern PBD::PropertyDescriptor<uint32_t> order;
        LIBARDOUR_API extern PBD::PropertyDescriptor<uint32_t> color;
        LIBARDOUR_API extern PBD::PropertyDescriptor<bool> selected;
        LIBARDOUR_API extern PBD::PropertyDescriptor<bool> trigger_track;
        /* we use this; declared in region.cc */
        LIBARDOUR_API extern PBD::PropertyDescriptor<bool> hidden;
}
 
class LIBARDOUR_API PresentationInfo : public PBD::Stateful
{
  public:
 
        /* a PresentationInfo object exists to share information between
         * different user interfaces (e.g. GUI and a Mackie Control surface)
         * about:
         *
         *     - ordering
         *     - selection status
         *     - visibility
         *     - object identity
         *
         * ORDERING
         *
         * One UI takes control of ordering by setting the "order" value for
         * the PresentationInfo component of every Stripable object. In Ardour,
         * this is done by the GUI (mostly because it is very hard for the user
         * to re-order things on a control surface).
         *
         * Ordering is a complex beast, however. Different user interfaces may
         * display things in different ways. For example, the GUI of Ardour
         * allows the user to mix busses in between tracks. A control surface
         * may do the same, but may also allow the user to press a button that
         * makes it show only busses, or only MIDI tracks. At that point, the
         * ordering on the surface differs from the ordering in the GUI.
         *
         * There are several pathways for the order being set:
         *
         *   - object created during session loading from XML
         *   - numeric order will be set during ::set_state(), based on
         *   - type will be set during ctor call
         *
         *   - object created in response to user request
         *   - numeric order will be set by Session, before adding to container.
         *   - type set during ctor call
         *
         *
         * OBJECT IDENTITY
         *
         * Control surfaces/protocols often need to be able to get a handle on
         * an object identified only abstractly, such as the "5th audio track"
         * or "the master out". A PresentationInfo object uniquely identifies
         * all objects in this way through the combination of its _order member
         * and part of its _flags member. The _flags member identifies the type
         * of object, as well as selection/hidden status. The type may never
         * change after construction (not strictly the constructor itself, but
         * a more generalized notion of construction, as in "ready to use").
         *
         * VISIBILITY
         *
         * When an object is hidden, its _flags member will have the Hidden
         * bit set.
         *
         *
         */
 
        enum Flag {
                /* Type information */
                AudioTrack = 0x1,
                MidiTrack = 0x2,
                AudioBus = 0x4,
                MidiBus = 0x8,
                VCA = 0x10,
                MasterOut = 0x20,
                MonitorOut = 0x40,
                Auditioner = 0x80,
                /* These are for sharing Stripable states between the GUI and other
                 * user interfaces/control surfaces
                 */
                Hidden = 0x100,
                /* single bit indicates that the group order is set */
                OrderSet = 0x400,
 
#ifdef MIXBUS
                MixbusEditorHidden = 0x800,
                Mixbus = 0x1000,
#endif
                /* bus type for monitor mixes */
                FoldbackBus = 0x2000,
 
                /* has TriggerBox, show on TriggerUI page */
                TriggerTrack = 0x4000,
 
                /* bus is the surround master */
                SurroundMaster = 0x8000,
 
                /* special mask to delect out "state" bits */
#ifdef MIXBUS
                StatusMask = (Hidden | MixbusEditorHidden | TriggerTrack),
#else
                StatusMask = (Hidden | TriggerTrack),
#endif
 
                /* dedicated [output] busses */
                MainBus = (MasterOut|MonitorOut|FoldbackBus|SurroundMaster),
 
                /* These can exist only once and require special attention to be removed */
                Singleton = (MasterOut|MonitorOut|SurroundMaster),
 
                /* special mask to delect select type bits */
                TypeMask = (AudioBus|AudioTrack|MidiTrack|MidiBus|VCA|MasterOut|MonitorOut|Auditioner|FoldbackBus|SurroundMaster)
        };
 
        static const Flag AllStripables; /* mask to use for any route or VCA (but not auditioner) */
        static const Flag MixerStripables; /* mask to use for any route or VCA (but not auditioner or foldbackbus) */
        static const Flag AllRoutes; /* mask to use for any route include master+monitor, but not auditioner */
        static const Flag MixerRoutes; /* mask to use for any route include master+monitor, but not auditioner or foldbackbus*/
        static const Flag Route;     /* mask for any route (bus or track */
        static const Flag Track;     /* mask to use for any track */
        static const Flag Bus;       /* mask to use for any bus */
        static const Flag MidiIndicatingFlags; /* MidiTrack or MidiBus */
 
        typedef uint32_t order_t;
        typedef uint32_t color_t;
 
        PresentationInfo (Flag f);
        PresentationInfo (order_t o, Flag f);
        PresentationInfo (PresentationInfo const &);
 
        static const order_t max_order;
 
        PresentationInfo::Flag flags() const { return _flags; }
        order_t  order() const { return _order; }
        color_t  color() const { return _color; }
 
        bool color_set() const;
 
        void set_color (color_t);
        void set_hidden (bool yn);
        void set_trigger_track (bool yn);
        void set_flags (Flag f) { _flags = f; }
 
        bool order_set() const { return _flags & OrderSet; }
 
        int selection_cnt() const { return _selection_cnt; }
 
        bool hidden() const { return _flags & Hidden; }
        bool trigger_track () const { return _flags & TriggerTrack; }
        bool special(bool with_master = true) const { return _flags & ((with_master ? MasterOut : 0)|SurroundMaster|MonitorOut|Auditioner); }
 
        bool flag_match (Flag f) const {
                /* no flags, match all */
 
                if (f == Flag (0)) {
                        return true;
                }
 
                if (f & StatusMask) {
                        /* status bits set, must match them */
                        if ((_flags & StatusMask) != (f & StatusMask)) {
                                return false;
                        }
                }
 
                /* Generic flags in f, match the right stuff */
 
                if (f == Bus && (_flags & Bus)) {
                        /* some kind of bus */
                        return true;
                }
                if (f == Track && (_flags & Track)) {
                        /* some kind of track */
                        return true;
                }
                if (f == Route && (_flags & Route)) {
                        /* any kind of route, but not master, monitor in
                           or auditioner.
                         */
                        return true;
                }
 
                if (f == AllRoutes && (_flags & AllRoutes)) {
                        /* any kind of route, but not auditioner. Ask for that
                           specifically.
                        */
                        return true;
                }
 
                if (f == AllStripables && (_flags & AllStripables)) {
                        /* any kind of stripable, but not auditioner. Ask for that
                           specifically.
                        */
                        return true;
                }
 
                /* check for any matching type bits.
                 *
                 * Do comparisoon without status mask or order set bits - we
                 * already checked that above.
                 */
 
                return ((f & TypeMask) & _flags);
        }
 
        int set_state (XMLNode const&, int);
        XMLNode& get_state () const;
 
        bool operator==(PresentationInfo const& other) {
                return (_order == other.order()) && (_flags == other.flags());
        }
 
        bool operator!=(PresentationInfo const& other) {
                return (_order != other.order()) || (_flags != other.flags());
        }
 
        PresentationInfo& operator= (PresentationInfo const& other);
 
        static Flag get_flags (XMLNode const& node);
        static Flag get_flags2X3X (XMLNode const& node);
        static std::string state_node_name;
 
        /* for things concerned about *any* PresentationInfo.
         */
 
        static PBD::Signal1<void,PBD::PropertyChange const &> Change;
        static void send_static_change (const PBD::PropertyChange&);
 
        static void make_property_quarks ();
 
  protected:
        friend class ChangeSuspender;
        static void suspend_change_signal ();
        static void unsuspend_change_signal ();
 
  public:
        class ChangeSuspender {
          public:
                ChangeSuspender() {
                        PresentationInfo::suspend_change_signal ();
                }
                ~ChangeSuspender() {
                        PresentationInfo::unsuspend_change_signal ();
                }
        };
 
  protected:
        friend class Stripable;
        void set_order (order_t order);
 
  private:
        order_t _order;
        Flag    _flags;
        color_t _color;
        int     _selection_cnt;
 
        static PBD::PropertyChange _pending_static_changes;
        static Glib::Threads::Mutex static_signal_lock;
        static std::atomic<int>   _change_signal_suspended;
 
        static int selection_counter;
};
 
}
 
namespace std {
std::ostream& operator<<(std::ostream& o, ARDOUR::PresentationInfo const& rid);
}
 
#endif /* __libardour_presentation_info_h__ */