diff --git a/app/src/main/java/org/cutem/cutecalendar/presenter/Presenter.java b/app/src/main/java/org/cutem/cutecalendar/presenter/Presenter.java
index cae56b5..69ea543 100644
--- a/app/src/main/java/org/cutem/cutecalendar/presenter/Presenter.java
+++ b/app/src/main/java/org/cutem/cutecalendar/presenter/Presenter.java
@@ -13,28 +13,28 @@ public abstract class Presenter {
 
     private TodoItemManager manager = TodoItemManager.getInstance();
 
-    abstract Calendar getCalendarShowingDate();
+
+    protected abstract Calendar getCalendarShowingDate();
+
+    protected abstract void showTodoItemDetail(TodoItem item);
+
+    protected abstract void showNewTodoItemStage();
 
 
-    abstract void showTodoItemDetail(TodoItem item);
-
-    abstract void showNewTodoItemStage();
-
-
-    void addTodoItem(@NotNull TodoItem item) {
+    protected final void addTodoItem(@NotNull TodoItem item) {
         manager.add(item);
         paintCalendar(getCalendarShowingDate());
     }
 
-    void removeTodoItem(@NotNull TodoItem item) {
+    protected final void removeTodoItem(@NotNull TodoItem item) {
         manager.remove(item);
         paintCalendar(getCalendarShowingDate());
     }
 
 
-    abstract void paintCalendar(@NotNull Calendar date, @NotNull List<CalendarUnit> days);
+    protected abstract void paintCalendar(@NotNull Calendar date, @NotNull List<CalendarUnit> days);
 
-    void paintCalendar(@NotNull Calendar date) {
+    protected final void paintCalendar(@NotNull Calendar date) {
         Calendar c1 = CalendarUtil.getMonthBegin(date);
         Calendar c2 = CalendarUtil.getMonthEnd(date);
         Calendar today = Calendar.getInstance();
@@ -57,9 +57,9 @@ public abstract class Presenter {
         paintCalendar(date, days);
     }
 
-    abstract void listTodoItems(List<TodoItem> items);
+    protected abstract void listTodoItems(List<TodoItem> items);
 
-    void listTodoItemDuring(Calendar from, Calendar to) {
+    protected final void listTodoItemDuring(Calendar from, Calendar to) {
         listTodoItems(manager.queryTodoItemsDuring(from, to));
     }