Make left-click on tempo/meter in main clock edit current tempo/meter

gtk2_ardour/audio_clock.cc

@@ -333,7 +333,7 @@ AudioClock::render (cairo_t* cr, cairo_rectangle_t*)
 
 		if (mode_based_info_ratio != 1.0) {
 
-			double left_rect_width = round (((get_width() - separator_height) * mode_based_info_ratio) + 0.5);
+			double left_rect_width = get_left_rect_width();
 
 			if (_need_bg) {
 				if (corner_radius) {

gtk2_ardour/audio_clock.h

@@ -101,6 +101,17 @@ class AudioClock : public CairoWidget, public ARDOUR::SessionHandlePtr
 	virtual void build_ops_menu ();
 	Gtk::Menu  *ops_menu;
 
+	bool on_button_press_event (GdkEventButton *ev);
+	bool on_button_release_event(GdkEventButton *ev);
+	bool is_lower_layout_click(int y) const {
+		return y > upper_height + separator_height;
+	}
+	bool is_right_layout_click(int x) const {
+		return x > x_leading_padding + get_left_rect_width() + separator_height;
+	}
+	double get_left_rect_width() const {
+	       return round (((get_width() - separator_height) * mode_based_info_ratio) + 0.5);
+	}
   private:
 	Mode             _mode;
 	std::string      _name;
@@ -186,8 +197,6 @@ class AudioClock : public CairoWidget, public ARDOUR::SessionHandlePtr
 	bool on_key_press_event (GdkEventKey *);
 	bool on_key_release_event (GdkEventKey *);
 	bool on_scroll_event (GdkEventScroll *ev);
-	bool on_button_press_event (GdkEventButton *ev);
-	bool on_button_release_event(GdkEventButton *ev);
 	void on_style_changed (const Glib::RefPtr<Gtk::Style>&);
 	void on_size_request (Gtk::Requisition* req);
 	bool on_motion_notify_event (GdkEventMotion *ev);

gtk2_ardour/main_clock.cc

@@ -116,3 +116,24 @@ MainClock::insert_new_meter ()
 	PublicEditor::instance().mouse_add_new_meter_event (absolute_time ());
 }
 
+bool
+MainClock::on_button_press_event (GdkEventButton *ev)
+{
+	if (ev->button == 1) {
+		if (mode() == BBT) {
+			if (is_lower_layout_click(ev->y)) {
+				if (is_right_layout_click(ev->x)) {
+					// meter on the right
+					edit_current_meter();
+				} else {
+					// tempo on the left
+					edit_current_tempo();
+				}
+				return true;
+			}
+		}
+	}
+
+	return AudioClock::on_button_press_event (ev);
+}
+

gtk2_ardour/main_clock.h

@@ -39,4 +39,6 @@ private:
 	void insert_new_meter ();
 	framepos_t absolute_time () const;
 	bool _primary;
+
+	bool on_button_press_event (GdkEventButton *ev);
 };