From 27dfbecd5450fc4b4881f02cd9e985c0aacc7ab5 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Wed, 29 Dec 2021 12:41:11 -0700
Subject: [PATCH] triggerbox: add skeleton for push/pop of cue-affected trigger
 properties

---
 libs/ardour/ardour/triggerbox.h | 18 ++++++++++++++++++
 libs/ardour/triggerbox.cc       | 18 ++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/libs/ardour/ardour/triggerbox.h b/libs/ardour/ardour/triggerbox.h
index c703e1f6c9..846e0482c0 100644
--- a/libs/ardour/ardour/triggerbox.h
+++ b/libs/ardour/ardour/triggerbox.h
@@ -287,6 +287,24 @@ class LIBARDOUR_API Trigger : public PBD::Stateful {
 	PBD::Property<bool>                 _isolated;
 	PBD::Property<color_t>              _color;
 
+	struct CueModifiedProperties {
+		FollowAction follow_action;
+		LaunchStyle  launch_style;
+
+		CueModifiedProperties() : follow_action (NextTrigger), launch_style (Toggle), _valid (false) {}
+		CueModifiedProperties (FollowAction fa, LaunchStyle ls) : follow_action (fa), launch_style (ls), _valid (true) {}
+
+		bool valid() const { return _valid; }
+		void invalidate() { _valid = false; }
+
+        private:
+		bool         _valid;
+	};
+
+	CueModifiedProperties pre_cue_properties;
+	void push_cue_properties ();
+	void pop_cue_properties ();
+
 	/* computed from data */
 
 	double                    _barcnt; /* our estimate of the number of bars in the region */
diff --git a/libs/ardour/triggerbox.cc b/libs/ardour/triggerbox.cc
index b5f75cdc00..309fadc4a7 100644
--- a/libs/ardour/triggerbox.cc
+++ b/libs/ardour/triggerbox.cc
@@ -112,6 +112,24 @@ Trigger::Trigger (uint32_t n, TriggerBox& b)
 	add_property (_color);
 }
 
+void
+Trigger::push_cue_properties ()
+{
+	/* must be called from RT process context */
+	pre_cue_properties = CueModifiedProperties (_follow_action0, _launch_style);
+}
+
+void
+Trigger::pop_cue_properties ()
+{
+	/* must be called from RT process context */
+	if (pre_cue_properties.valid()) {
+		_follow_action0 = pre_cue_properties.follow_action;
+		_launch_style = pre_cue_properties.launch_style;
+		pre_cue_properties.invalidate ();
+	}
+}
+
 void
 Trigger::request_trigger_delete (Trigger* t)
 {