From fbc55a75b4432d545b5db44a704665a6f7e73577 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Fri, 7 Feb 2025 23:09:02 -0700
Subject: [PATCH] API changes to MetaButton, mostly to allow submenus to be
 hung from the built menu

---
 libs/widgets/metabutton.cc        | 46 ++++++++++++++++++++++++++++---
 libs/widgets/widgets/metabutton.h | 24 ++++++++++++++++
 2 files changed, 66 insertions(+), 4 deletions(-)

diff --git a/libs/widgets/metabutton.cc b/libs/widgets/metabutton.cc
index 9809b98f1d..312530ffe8 100644
--- a/libs/widgets/metabutton.cc
+++ b/libs/widgets/metabutton.cc
@@ -71,16 +71,39 @@ MetaButton::add_item (std::string const& label, std::string const& menutext, sig
 	}
 }
 
+void
+MetaButton::add_item (std::string const& label, std::string const & menutext, Gtk::Menu& submenu, sigc::slot<void> const & cb)
+{
+	using namespace Menu_Helpers;
+
+	add_sizing_text (label);
+	MenuList& items = _menu.items ();
+	items.push_back (MetaElement (label, menutext, cb, sigc::mem_fun (*this, &MetaButton::activate_item), submenu));
+	if (items.size () == 1) {
+		_menu.set_active (0);
+		update_button (dynamic_cast<MetaMenuItem*> (&items.back ()));
+		set_text (label);
+	}
+}
+
+bool
+MetaButton::is_menu_popup_event (GdkEventButton* ev) const
+{
+	return ((ev->type == GDK_BUTTON_PRESS && ev->button == 3) ||
+	        (ev->type == GDK_BUTTON_PRESS && ev->button == 1 && ev->x > (get_width () - _diameter - 7)));
+}
+
 bool
 MetaButton::on_button_press_event (GdkEventButton* ev)
 {
 	MetaMenuItem const* current_active = dynamic_cast<MetaMenuItem*> (_menu.get_active ());
 
-	if (ev->type == GDK_BUTTON_PRESS && ev->button == 3) {
+	if (is_menu_popup_event (ev)) {
 		Gtkmm2ext::anchored_menu_popup (&_menu, this, current_active ? current_active->menutext () : "", ev->button, ev->time);
-	} else if (ev->type == GDK_BUTTON_PRESS && ev->button == 1 && ev->x > (get_width () - _diameter - 7)) {
-		Gtkmm2ext::anchored_menu_popup (&_menu, this, current_active ? current_active->menutext () : "", ev->button, ev->time);
-	} else if (ev->type == GDK_BUTTON_PRESS && ev->button == 1) {
+		return true;
+	}
+
+	if (ev->type == GDK_BUTTON_PRESS && ev->button == 1) {
 		if (current_active) {
 			current_active->activate ();
 		}
@@ -136,6 +159,21 @@ MetaButton::set_active (std::string const& menulabel)
 	}
 }
 
+void
+MetaButton::set_by_menutext (std::string const & mt)
+{
+	guint c = 0;
+	for (auto & i : _menu.items()) {
+		if (i.get_label() == mt) {
+			_menu.set_active (c);
+			_active = c;
+			update_button (dynamic_cast<MetaMenuItem*> (&i));
+			break;
+		}
+		++c;
+	}
+}
+
 void
 MetaButton::set_index (guint index)
 {
diff --git a/libs/widgets/widgets/metabutton.h b/libs/widgets/widgets/metabutton.h
index 3e7716f581..c0c3a690ec 100644
--- a/libs/widgets/widgets/metabutton.h
+++ b/libs/widgets/widgets/metabutton.h
@@ -33,16 +33,22 @@ public:
 	virtual ~MetaButton ();
 
 	void add_item (std::string const& label, std::string const& menutext, sigc::slot<void> const&);
+	void add_item (std::string const& label, std::string const& menutext, Gtk::Menu&, sigc::slot<void> const&);
 	void clear_items ();
 
 	void set_active (std::string const&);
 	void set_index (guint);
+	void set_by_menutext (std::string const & mt);
 
 	guint index () const
 	{
 		return _active;
 	}
 
+	Gtk::Menu& menu() { return _menu; }
+
+	bool is_menu_popup_event (GdkEventButton* ev) const;
+
 protected:
 	bool on_button_press_event (GdkEventButton*);
 	bool on_motion_notify_event (GdkEventMotion*);
@@ -60,6 +66,14 @@ private:
 		{
 		}
 
+		MetaMenuItem (std::string const& label, std::string const& menutext, sigc::slot<void> const & cb, Gtk::Menu& submenu)
+			: Gtk::MenuItem (menutext, false)
+			, _label (label)
+			, _cb (cb)
+		{
+			set_submenu (submenu);
+		}
+
 		void activate () const
 		{
 			_cb ();
@@ -94,6 +108,16 @@ private:
 			child_->signal_activate ().connect (sigc::bind (wrap, mmi));
 			child_->show ();
 		}
+		MetaElement (std::string const& label, std::string const & menutext, sigc::slot<void> const & cb, SlotActivate const & wrap, Gtk::Menu& submenu)
+			: Gtk::Menu_Helpers::MenuElem ("")
+		{
+			MetaMenuItem* mmi = manage (new MetaMenuItem (label, menutext, cb, submenu));
+			child_->unreference ();
+			set_child (mmi);
+			child_->signal_activate ().connect (sigc::bind (wrap, mmi));
+			child_->show ();
+		}
+
 	};
 
 	void activate_item (MetaMenuItem const*);