Working menu split and merge

src/main.cpp

@@ -30,6 +30,8 @@ void ProcessControls() {
       // Split selected
       if(selected_menu->GetState() == MenuState::kSplit) {
 	manager->ToggleSplit();
+	left_menu->UpdateMenuState();
+	right_menu->UpdateMenuState();
 	// Enable split
 	if (manager->GetSplitMode()) {
 	  droplet_left->UpdateState(DropletState::kLeft);

src/menu.cpp

@@ -16,13 +16,12 @@ Menu::Menu(DaisyPatch* m_patch,
   buffer = selected;
   highlighted = selected;
 
-  head->SetStateVisibility(MenuState::kChange, false);
-
   if (state == DropletState::kLeft) {
     head->SetStateTitle(MenuState::kChange, "Right");
   } else if (state == DropletState::kRight) {
     head->SetStateTitle(MenuState::kChange, "Left");
   }
+  this->UpdateMenuState();
 }
 
 bool Menu::InMenu() {
@@ -106,3 +105,12 @@ MenuState Menu::GetState() {
   return highlighted->GetState();
 }
 
+void Menu::UpdateMenuState() {
+  if (manager->GetSplitMode()) {
+    head->SetStateVisibility(MenuState::kChange, true);
+    head->SetStateTitle(MenuState::kSplit, "Merge");
+  } else {
+    head->SetStateVisibility(MenuState::kChange, false);
+    head->SetStateTitle(MenuState::kSplit, "Split");
+  }
+}

src/menu.h

@@ -84,6 +84,11 @@ class Menu {
    * @return menu state
    */
   MenuState GetState();
+
+  /*
+   * Updates the menu upon a split or a merge.
+   */
+  void UpdateMenuState();
 };
 
 #endif // CASCADE_MENU_H_

src/menu_item.h

@@ -91,7 +91,20 @@ class MenuItem {
    */
   void ToggleVisibility();
 
+  /*
+   * Set the visibility of all menu items with a given state.
+   *
+   * @param state
+   * @param visibility
+   */
   void SetStateVisibility(MenuState m_state, bool visibility);
+
+  /*
+   * Set the title of all menu items with a given state.
+   *
+   * @param state
+   * @param title
+   */
   void SetStateTitle(MenuState m_state, std::string m_title);
 
   /*