diff --git a/gtk2_ardour/trigger_ui.cc b/gtk2_ardour/trigger_ui.cc
new file mode 100644
index 0000000000..c272f1a2dd
--- /dev/null
+++ b/gtk2_ardour/trigger_ui.cc
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2021 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 <gtkmm/filechooserdialog.h>
+#include <gtkmm/menu.h>
+#include <gtkmm/menuitem.h>
+#include <gtkmm/stock.h>
+
+#include "pbd/i18n.h"
+#include "pbd/compose.h"
+#include "pbd/convert.h"
+
+#include "ardour/region.h"
+#include "ardour/triggerbox.h"
+
+#include "canvas/polygon.h"
+#include "canvas/text.h"
+
+#include "gtkmm2ext/utils.h"
+
+#include "ardour_ui.h"
+#include "gui_thread.h"
+#include "trigger_ui.h"
+#include "public_editor.h"
+#include "ui_config.h"
+#include "utils.h"
+
+using namespace ARDOUR;
+using namespace ArdourCanvas;
+using namespace Gtkmm2ext;
+using namespace PBD;
+
+
+TriggerUI::TriggerUI (Item* parent, Trigger& t)
+	: Box (parent, Box::Vertical)
+	, trigger (t)
+{
+}
+
+TriggerUI::~TriggerUI ()
+{
+}
+
+/* ------------ */
+
+TriggerWidget::TriggerWidget (Trigger& t)
+{
+	ui = new TriggerUI (root(), t);
+	set_background_color (UIConfiguration::instance().color (X_("theme:bg")));
+}
+
+void
+TriggerWidget::size_request (double& w, double& h) const
+{
+	ui->size_request (w, h);
+}
+
+/* ------------ */
+
+TriggerWindow::TriggerWindow (Trigger& t)
+{
+	TriggerWidget* tw = manage (new TriggerWidget (t));
+	set_title (_("Trigger XXXX"));
+
+	double w;
+	double h;
+
+	tw->size_request (w, h);
+
+	set_default_size (w, h);
+	add (*tw);
+	tw->show ();
+}
+
+bool
+TriggerWindow::on_key_press_event (GdkEventKey* ev)
+{
+	Gtk::Window& main_window (ARDOUR_UI::instance()->main_window());
+	return ARDOUR_UI_UTILS::relay_key_press (ev, &main_window);
+}
+
+bool
+TriggerWindow::on_key_release_event (GdkEventKey* ev)
+{
+	Gtk::Window& main_window (ARDOUR_UI::instance()->main_window());
+	return ARDOUR_UI_UTILS::relay_key_press (ev, &main_window);
+}
diff --git a/gtk2_ardour/trigger_ui.h b/gtk2_ardour/trigger_ui.h
new file mode 100644
index 0000000000..a6b8c0111b
--- /dev/null
+++ b/gtk2_ardour/trigger_ui.h
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2021 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 __ardour_gtk_trigger_ui_h__
+#define __ardour_gtk_trigger_ui_h__
+
+#include "ardour/triggerbox.h"
+
+#include "canvas/box.h"
+#include "canvas/canvas.h"
+#include "canvas/rectangle.h"
+
+namespace ArdourCanvas {
+	class Text;
+	class Polygon;
+};
+
+class TriggerUI : public ArdourCanvas::Box
+{
+  public:
+	TriggerUI (ArdourCanvas::Item* parent, ARDOUR::Trigger&);
+	~TriggerUI ();
+
+  private:
+	ARDOUR::Trigger& trigger;
+
+	ArdourCanvas::Rectangle*  follow_label;
+	ArdourCanvas::Text*  follow_text;
+
+	ArdourCanvas::Rectangle* follow_left;
+	ArdourCanvas::Text* follow_left_text;
+	ArdourCanvas::Rectangle* follow_left_percentage;
+	ArdourCanvas::Text* follow_left_percentage_text;
+
+	ArdourCanvas::Rectangle* follow_right;
+	ArdourCanvas::Text* follow_right_text;
+	ArdourCanvas::Rectangle* follow_right_percentage;
+	ArdourCanvas::Text* follow_right_percentage_text;
+
+	ArdourCanvas::Rectangle* percentage_slider;
+
+	ArdourCanvas::Rectangle* follow_count;
+	ArdourCanvas::Text* follow_count_text;
+
+	ArdourCanvas::Rectangle* legato;
+	ArdourCanvas::Rectangle* legato_text;
+
+	ArdourCanvas::Rectangle* quantize;
+	ArdourCanvas::Rectangle* quantize_text;
+
+	ArdourCanvas::Rectangle* velocity;
+	ArdourCanvas::Rectangle* velocity_text;
+};
+
+class TriggerWidget : public ArdourCanvas::GtkCanvas
+{
+  public:
+	TriggerWidget (ARDOUR::Trigger& tb);
+	void size_request (double& w, double& h) const;
+
+  private:
+	TriggerUI* ui;
+};
+
+/* XXX probably for testing only */
+
+class TriggerWindow : public Gtk::Window
+{
+    public:
+	TriggerWindow (ARDOUR::Trigger&);
+
+	bool on_key_press_event (GdkEventKey*);
+	bool on_key_release_event (GdkEventKey*);
+};
+
+#endif /* __ardour_gtk_trigger_ui_h__ */