103 lines
3.6 KiB
C++
103 lines
3.6 KiB
C++
/*
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Copyright (C) 2023 Paul Davis <paul@linuxaudiosystems.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __temporal_domain_provider_h__
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#define __temporal_domain_provider_h__
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#include "pbd/signals.h"
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#include "pbd/stateful.h"
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#include "temporal/types.h"
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namespace Temporal {
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class TimeDomainProvider {
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public:
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explicit TimeDomainProvider () : have_domain (false), parent (nullptr) {}
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explicit TimeDomainProvider (TimeDomain td) : have_domain (true), domain (td), parent (nullptr) {}
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TimeDomainProvider (TimeDomain td, TimeDomainProvider const & p) : have_domain (true), domain (td), parent (&p) { listen(); }
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/* Copy constructor - note how a constructor that only set the parent would have the same signature. */
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TimeDomainProvider (TimeDomainProvider const & other) : have_domain (other.have_domain), domain (other.domain), parent (other.parent) { listen(); }
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/* The extra bool argument is just to differentiate this from the copy constructor above */
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TimeDomainProvider (TimeDomainProvider const & parnt, bool) : have_domain (false), parent (&parnt) { listen(); }
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virtual ~TimeDomainProvider() {}
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/* replicates part of Stateful API but we do not want inheritance */
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XMLNode& get_state () const;
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int set_state (const XMLNode&, int version);
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TimeDomainProvider& operator= (TimeDomainProvider const & other) {
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if (this != &other) {
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parent_connection.disconnect ();
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have_domain = other.have_domain;
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domain = other.domain;
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parent = other.parent;
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listen ();
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}
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return *this;
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}
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TimeDomain time_domain() const { if (have_domain) return domain; if (parent) return parent->time_domain(); return AudioTime; }
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bool has_own_time_domain() const { return have_domain; }
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void clear_time_domain () { have_domain = false; TimeDomainChanged(); /* EMIT SIGNAL */ }
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void set_time_domain (TimeDomain td) { have_domain = true; domain = td; time_domain_changed(); TimeDomainChanged(); /* EMIT SIGNAL */}
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TimeDomainProvider const * time_domain_parent() const { return parent; }
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bool has_time_domain_parent() const { return (bool) parent; }
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void clear_time_domain_parent () { parent = nullptr; TimeDomainChanged (); /* EMIT SIGNAL */ }
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void set_time_domain_parent (TimeDomainProvider const & p) {
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parent_connection.disconnect ();
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TimeDomain old_domain = time_domain();
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parent = &p;
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have_domain = false;
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TimeDomain new_domain = time_domain ();
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if (old_domain != new_domain) {
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TimeDomainChanged ();
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}
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}
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mutable PBD::Signal0<void> TimeDomainChanged;
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virtual void time_domain_changed() {
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/* Forward a time domain change to children */
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TimeDomainChanged();
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}
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protected:
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void listen () {
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if (parent) {
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parent->TimeDomainChanged.connect_same_thread (parent_connection, boost::bind (&TimeDomainProvider::time_domain_changed, this));
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}
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}
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private:
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bool have_domain;
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TimeDomain domain;
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TimeDomainProvider const * parent;
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PBD::ScopedConnection parent_connection;
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};
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}
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#endif /* __temporal_domain_provider_h__ */
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