From d25a615e20e6a65926de29cb57040f6dfa335354 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Thu, 23 Feb 2023 23:01:09 -0700
Subject: [PATCH] API development for time domain flipping (GUI edition)

---
 gtk2_ardour/editor.h               |  4 ++++
 gtk2_ardour/editor_drag.cc         |  7 ++++---
 gtk2_ardour/editor_tempodisplay.cc | 28 ++++++++++++++++++++++++++++
 gtk2_ardour/public_editor.h        |  7 +++++++
 4 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/gtk2_ardour/editor.h b/gtk2_ardour/editor.h
index 127c1b3595..363a050973 100644
--- a/gtk2_ardour/editor.h
+++ b/gtk2_ardour/editor.h
@@ -1742,6 +1742,9 @@ private:
 	void mid_tempo_per_region_update (RegionView*);
 	bool ignore_map_change;
 
+	Temporal::TempoMap::WritableSharedPtr begin_tempo_mapping ();
+	void abort_tempo_mapping ();
+
 	enum MidTempoChanges {
 		TempoChanged = 0x1,
 		MeterChanged = 0x2,
@@ -1752,6 +1755,7 @@ private:
 
 protected:
 	void _commit_tempo_map_edit (Temporal::TempoMap::WritableSharedPtr&, bool with_update = false);
+	void _commit_tempo_mapping (Temporal::TempoMap::WritableSharedPtr&);
 
 private:
 	friend class DragManager;
diff --git a/gtk2_ardour/editor_drag.cc b/gtk2_ardour/editor_drag.cc
index c3da90b8e7..5a10ee7d18 100644
--- a/gtk2_ardour/editor_drag.cc
+++ b/gtk2_ardour/editor_drag.cc
@@ -3633,7 +3633,8 @@ TempoTwistDrag::start_grab (GdkEvent* event, Gdk::Cursor* cursor)
 {
 	Drag::start_grab (event, cursor);
 
-	map = _editor->begin_tempo_map_edit ();
+	map = _editor->begin_tempo_mapping ();
+
 	/* Get the tempo point that starts this section */
 
 	_tempo = const_cast<TempoPoint*> (&map->tempo_at (raw_grab_time()));
@@ -3714,13 +3715,13 @@ TempoTwistDrag::finished (GdkEvent* event, bool movement_occurred)
 	_editor->session()->add_command (new Temporal::TempoCommand (_("twist tempo"), _before_state, &after));
 	_editor->commit_reversible_command ();
 
-	_editor->commit_tempo_map_edit (map);
+	_editor->commit_tempo_mapping (map);
 }
 
 void
 TempoTwistDrag::aborted (bool moved)
 {
-	_editor->abort_tempo_map_edit ();
+	_editor->abort_tempo_mapping ();
 }
 
 TempoEndDrag::TempoEndDrag (Editor* e, ArdourCanvas::Item* i)
diff --git a/gtk2_ardour/editor_tempodisplay.cc b/gtk2_ardour/editor_tempodisplay.cc
index dce2dd8cb8..953634f824 100644
--- a/gtk2_ardour/editor_tempodisplay.cc
+++ b/gtk2_ardour/editor_tempodisplay.cc
@@ -754,6 +754,34 @@ Editor::real_remove_meter_marker (Temporal::MeterPoint const * section)
 	return FALSE;
 }
 
+
+Temporal::TempoMap::WritableSharedPtr
+Editor::begin_tempo_mapping ()
+{
+	TempoMap::WritableSharedPtr wmap = TempoMap::fetch_writable ();
+	reassociate_metric_markers (wmap);
+	(void) Temporal::DomainSwapInformation::start (Temporal::BeatTime);
+	_session->globally_change_time_domain (Temporal::BeatTime, Temporal::AudioTime);
+	return wmap;
+}
+
+void
+Editor::abort_tempo_mapping ()
+{
+	delete domain_swap; /* undo the domain swap */
+	domain_swap = 0;
+
+	TempoMap::SharedPtr tmap (TempoMap::fetch());
+	reassociate_metric_markers (tmap);
+}
+
+void
+Editor::_commit_tempo_mapping (TempoMap::WritableSharedPtr& new_map)
+{
+	TempoMap::update (new_map);
+	abort_tempo_mapping ();
+}
+
 Temporal::TempoMap::WritableSharedPtr
 Editor::begin_tempo_map_edit ()
 {
diff --git a/gtk2_ardour/public_editor.h b/gtk2_ardour/public_editor.h
index a833e3566d..da6ac30c5e 100644
--- a/gtk2_ardour/public_editor.h
+++ b/gtk2_ardour/public_editor.h
@@ -520,6 +520,12 @@ public:
 		_commit_tempo_map_edit (map, with_update);
 	}
 
+	virtual Temporal::TempoMap::WritableSharedPtr begin_tempo_mapping () = 0;
+	virtual void abort_tempo_mapping () = 0;
+	void commit_tempo_mapping (Temporal::TempoMap::WritableSharedPtr& map) {
+		_commit_tempo_mapping (map);
+	}
+
 	virtual void access_action (const std::string&, const std::string&) = 0;
 	virtual void set_toggleaction (const std::string&, const std::string&, bool) = 0;
 
@@ -584,6 +590,7 @@ protected:
 	virtual void suspend_route_redisplay () = 0;
 	virtual void resume_route_redisplay () = 0;
 	virtual void _commit_tempo_map_edit (Temporal::TempoMap::WritableSharedPtr&, bool with_update) = 0;
+	virtual void _commit_tempo_mapping (Temporal::TempoMap::WritableSharedPtr&) = 0;
 
 	std::atomic<int> _suspend_route_redisplay_counter;
 };