temporal: new object to try to make domain swaps undo-able

libs/ardour/ardour/midi_region.h

@@ -26,8 +26,8 @@
 #include <vector>
 
 #include "temporal/beats.h"
+#include "temporal/domainswap.h"
 #include "temporal/range.h"
-#include "temporal/types.h"
 
 #include "pbd/string_convert.h"
 

libs/temporal/domainswap.cc

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2023 Paul Davis <paul@linuxaudiosystems.com>
+ *
+ * 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.
+ */
+
+#include "temporal/domainswap.h"
+
+using namespace Temporal;
+
+void
+TimeDomainCommand::add (TimeDomainSwapper& tds)
+{
+	tds.DropReferences.connect_same_thread (tds_connections, boost::bind (&TimeDomainCommand::going_away, this, &tds));
+	swappers.insert (&tds);
+}
+
+void
+TimeDomainCommand::going_away (TimeDomainSwapper* tds)
+{
+	Swappers::iterator i = swappers.find (tds);
+
+	if (i != swappers.end()) {
+		swappers.erase (i);
+	}
+}
+
+void
+TimeDomainCommand::operator() ()
+{
+	for (auto & swapper : swappers) {
+		swapper->swap_domain (from, to);
+	}
+}
+
+void
+TimeDomainCommand::undo ()
+{
+	for (auto & swapper : swappers) {
+		swapper->swap_domain (to, from);
+	}
+}

libs/temporal/temporal/domainswap.h

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2023 Paul Davis <paul@linuxaudiosystems.com>
+ *
+ * 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 __temporal_domain_swap_h__
+#define __temporal_domain_swap_h__
+
+#include <set>
+
+#include "pbd/command.h"
+#include "pbd/destructible.h"
+#include "pbd/signals.h"
+
+#include "temporal/types.h"
+
+namespace Temporal {
+
+struct LIBTEMPORAL_API TimeDomainSwapper : public virtual PBD::Destructible {
+	virtual ~TimeDomainSwapper() {}
+	virtual void swap_domain (Temporal::TimeDomain from, Temporal::TimeDomain to) = 0;
+};
+
+
+struct LIBTEMPORAL_API TimeDomainCommand : public Command {
+  public:
+	TimeDomainCommand (TimeDomain f, TimeDomain t) : from (f), to (t) {}
+	void add (TimeDomainSwapper&);
+
+	void operator() ();
+	void undo ();
+
+  private:
+	TimeDomain from;
+	TimeDomain to;
+
+	typedef std::set<TimeDomainSwapper*> Swappers;
+	Swappers swappers;
+	PBD::ScopedConnectionList tds_connections;
+
+	void going_away (TimeDomainSwapper*);
+
+};
+
+}
+
+#endif /* __tmeporal_domain_swap_h__ */

libs/temporal/temporal/tempo.h

@@ -42,6 +42,7 @@
 #include "temporal/beats.h"
 #include "temporal/bbt_argument.h"
 #include "temporal/bbt_time.h"
+#include "temporal/domainswap.h"
 #include "temporal/superclock.h"
 #include "temporal/timeline.h"
 #include "temporal/types.h"

libs/temporal/temporal/types.h

@@ -124,14 +124,8 @@ enum RoundMode {
 
 extern void setup_enum_writer ();
 
-struct LIBTEMPORAL_API TimeDomainSwapper {
-	virtual ~TimeDomainSwapper() {}
-	virtual void swap_domain (Temporal::TimeDomain from, Temporal::TimeDomain to) = 0;
-};
-
 }
 
 std::ostream& operator<< (std::ostream& o, Temporal::ratio_t const & r);
 
-
 #endif /* __libpbd_position_types_h__ */

libs/temporal/wscript

@@ -28,6 +28,7 @@ temporal_sources = [
     'debug.cc',
     'bbt_time.cc',
     'beats.cc',
+    'domainswap.cc',
     'enums.cc',
     'range.cc',
     'superclock.cc',