allow hiding and showing the mixer list

gtk2_ardour/ardour.menus.in

@@ -504,6 +504,7 @@
 
       <menuitem action='show-editor-mixer'/>
       <menuitem action='show-editor-list'/>
+      <menuitem action='ToggleMixerList'/>
       <menuitem action='ToggleMeasureVisibility'/>
       <menuitem action='ToggleSummary'/>
       <menuitem action='ToggleGroupTabs'/>

gtk2_ardour/ardour_ui.h

@@ -202,6 +202,7 @@ class ARDOUR_UI : public Gtkmm2ext::UI, public ARDOUR::SessionHandlePtr
 	void new_midi_tracer_window ();
 	void toggle_editing_space();
 	void toggle_mixer_space();
+	void toggle_mixer_list();
 	void toggle_keep_tearoffs();
 
 	static PublicEditor* _instance;

gtk2_ardour/ardour_ui_dialogs.cc

@@ -586,3 +586,14 @@ ARDOUR_UI::toggle_mixer_space()
 		}
 	}
 }
+
+void
+ARDOUR_UI::toggle_mixer_list()
+{
+	Glib::RefPtr<Action> act = ActionManager::get_action ("Common", "ToggleMixerList");
+
+	if (act) {
+		Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic(act);
+			mixer->show_mixer_list (tact->get_active());
+	}
+}

gtk2_ardour/ardour_ui_ed.cc

@@ -215,6 +215,9 @@ ARDOUR_UI::install_actions ()
 	act = ActionManager::register_toggle_action (common_actions, X_("KeepTearoffs"), _("Show Toolbars"), mem_fun (*this, &ARDOUR_UI::toggle_keep_tearoffs));
 	ActionManager::session_sensitive_actions.push_back (act);
 
+	act = ActionManager::register_toggle_action (common_actions, X_("ToggleMixerList"), _("Toggle Mixer List"), sigc::mem_fun (*this, &ARDOUR_UI::toggle_mixer_list));
+	ActionManager::session_sensitive_actions.push_back (act);
+
 if (Profile->get_mixbus())
 	ActionManager::register_action (common_actions, X_("show-ui-prefs"), _("Show more UI preferences"), sigc::mem_fun (*this, &ARDOUR_UI::show_ui_prefs));
 

gtk2_ardour/mixer_ui.cc

@@ -100,6 +100,7 @@ Mixer_UI::Mixer_UI ()
         , _route_deletion_in_progress (false)
 	, _following_editor_selection (false)
 	, _maximised (false)
+	, _show_mixer_list (true)
 {
 	/* allow this window to become the key focus window */
 	set_flags (CAN_FOCUS);
@@ -1429,6 +1430,24 @@ Mixer_UI::route_group_property_changed (RouteGroup* group, const PropertyChange&
 	}
 }
 
+void
+Mixer_UI::show_mixer_list (bool yn)
+{
+	if (yn) {
+		list_vpacker.show ();
+		
+		//if user wants to show the pane, we should make sure that it is wide enough to be visible 
+		int width = list_hpane.get_position();
+		if (width < 40)
+			list_hpane.set_position(40);
+	} else {
+		list_vpacker.hide ();
+	}
+	
+	_show_mixer_list = yn;
+}
+
+
 void
 Mixer_UI::route_group_name_edit (const std::string& path, const std::string& new_text)
 {
@@ -1639,6 +1658,17 @@ Mixer_UI::set_state (const XMLNode& node)
 		}
 	}
 
+	if ((prop = node.property ("show-mixer-list"))) {
+		bool yn = string_is_affirmative (prop->value());
+		Glib::RefPtr<Action> act = ActionManager::get_action (X_("Common"), X_("ToggleMixerList"));
+		assert (act);
+		Glib::RefPtr<ToggleAction> tact = Glib::RefPtr<ToggleAction>::cast_dynamic(act);
+
+		/* do it twice to force the change */
+		tact->set_active (!yn);
+		tact->set_active (yn);
+	}
+
 
 	return 0;
 }
@@ -1682,6 +1712,8 @@ Mixer_UI::get_state (void)
 
 	node->add_property ("show-mixer", _visible ? "yes" : "no");
 
+	node->add_property ("show-mixer-list", _show_mixer_list ? "yes" : "no");
+
 	node->add_property ("maximised", _maximised ? "yes" : "no");
 
 	return *node;

gtk2_ardour/mixer_ui.h

@@ -75,6 +75,8 @@ class Mixer_UI : public Gtk::Window, public PBD::ScopedConnectionList, public AR
 	XMLNode& get_state (void);
 	int set_state (const XMLNode& );
 
+	void show_mixer_list (bool yn);
+	
 	void show_window ();
 	bool hide_window (GdkEventAny *ev);
 	void show_strip (MixerStrip *);
@@ -293,6 +295,9 @@ class Mixer_UI : public Gtk::Window, public PBD::ScopedConnectionList, public AR
 
 	/// true if we are in fullscreen mode
 	bool _maximised;
+
+	// true if mixer list is visible
+	bool _show_mixer_list;
 };
 
 #endif /* __ardour_mixer_ui_h__ */