diff --git a/source/event/Listener.py b/source/event/Listener.py
new file mode 100644
index 0000000..3b90e52
--- /dev/null
+++ b/source/event/Listener.py
@@ -0,0 +1,17 @@
+from typing import Callable
+
+
+class Listener:
+    def __init__(self):
+        self._events_listener: dict[str, set[Callable]] = {}
+
+    def add_listener(self, name: str, callback: Callable):
+        if name not in self._events_listener: self._events_listener[name] = set()
+        self._events_listener[name].add(callback)
+
+    def remove_listener(self, name: str, callback: Callable):
+        self._events_listener[name].remove(callback)
+
+    def trigger_event(self, name: str, *args, **kwargs):
+        for listener in self._events_listener.get(name, set()):
+            listener(*args, **kwargs)
diff --git a/source/event/__init__.py b/source/event/__init__.py
new file mode 100644
index 0000000..b05b661
--- /dev/null
+++ b/source/event/__init__.py
@@ -0,0 +1 @@
+from .Listener import Listener
diff --git a/source/gui/scene/MainMenu.py b/source/gui/scene/MainMenu.py
index adbe64a..a88f986 100644
--- a/source/gui/scene/MainMenu.py
+++ b/source/gui/scene/MainMenu.py
@@ -45,7 +45,7 @@ class MainMenu(Scene):
             texture_click=texture_button_click
         )
 
-        self.game_create.on_release = lambda *_: self.window.set_scene(scene.RoomCreate)
+        self.game_create.add_listener("on_click_release", lambda *_: self.window.set_scene(scene.RoomCreate))
 
         self.game_join = self.add_widget(
             widget.Button,
@@ -60,7 +60,7 @@ class MainMenu(Scene):
             texture_click=texture_button_click
         )
 
-        self.game_join.on_release = lambda *_: self.window.set_scene(scene.RoomJoin)
+        self.game_join.add_listener("on_click_release", lambda *_: self.window.set_scene(scene.RoomJoin))
 
         self.settings = self.add_widget(
             widget.Button,
@@ -75,7 +75,7 @@ class MainMenu(Scene):
             texture_click=texture_button_click
         )
 
-        self.settings.on_release = lambda *_: self.window.set_scene(scene.Settings)
+        self.settings.add_listener("on_click_release", lambda *_: self.window.set_scene(scene.Settings))
 
         self.fps_display = self.add_widget(FPSDisplay, color=(255, 255, 255, 180))
 
diff --git a/source/gui/scene/RoomCreate.py b/source/gui/scene/RoomCreate.py
index 35f2eeb..0e43c1d 100644
--- a/source/gui/scene/RoomCreate.py
+++ b/source/gui/scene/RoomCreate.py
@@ -36,7 +36,7 @@ class RoomCreate(Scene):
         )
 
         from source.gui.scene import MainMenu
-        self.back.on_release = lambda *_: self.window.set_scene(MainMenu)
+        self.back.add_listener("on_click_release", lambda *_: self.window.set_scene(MainMenu))
 
         self.label_ip = self.add_widget(
             widget.Text,
diff --git a/source/gui/scene/RoomJoin.py b/source/gui/scene/RoomJoin.py
index 78e94f7..a27915e 100644
--- a/source/gui/scene/RoomJoin.py
+++ b/source/gui/scene/RoomJoin.py
@@ -34,7 +34,7 @@ class RoomJoin(Scene):
         )
 
         from source.gui.scene import MainMenu
-        self.back.on_release = lambda *_: self.window.set_scene(MainMenu)
+        self.back.add_listener("on_click_release", lambda *_: self.window.set_scene(MainMenu))
 
         self.entry_ip = self.add_widget(
             widget.Input,
@@ -69,12 +69,12 @@ class RoomJoin(Scene):
             texture_click=texture_button_click
         )
 
-        self.connect.on_release = lambda *_: network.Client(
+        self.connect.add_listener("on_click_release", lambda *_: network.Client(
             window=self.window,
             ip_address=self.entry_ip.text,
             daemon=True,
             username="Client"
-        ).start()
+        ).start())
 
     def on_draw(self):
         self.back.draw()
diff --git a/source/gui/scene/Settings.py b/source/gui/scene/Settings.py
index 939adb6..1bc2f9c 100644
--- a/source/gui/scene/Settings.py
+++ b/source/gui/scene/Settings.py
@@ -37,7 +37,7 @@ class Settings(Scene):
         )
 
         from source.gui.scene import MainMenu
-        self.back.on_release = lambda *_: self.window.set_scene(MainMenu)
+        self.back.add_listener("on_click_release", lambda *_: self.window.set_scene(MainMenu))
 
         self.checkbox = self.add_widget(
             widget.Checkbox,
diff --git a/source/gui/widget/Button.py b/source/gui/widget/Button.py
index 2b786eb..7915560 100644
--- a/source/gui/widget/Button.py
+++ b/source/gui/widget/Button.py
@@ -47,6 +47,9 @@ class Button(BoxWidget):
             **dict_prefix("label_", kwargs)
         )
 
+        self.add_listener("on_hover_change", lambda *_: self._refresh_background())
+        self.add_listener("on_click_change", lambda *_: self._refresh_background())
+
         self._refresh_size()  # refresh the size and position for the background and label
 
     # background
@@ -76,20 +79,7 @@ class Button(BoxWidget):
         self.background.width, self.background.height = self.size
 
         # center the label
-        self.label.x = self.x + (self.width / 2)
-        self.label.y = self.y + (self.height / 2)
-
-    @BoxWidget.hovering.setter
-    def hovering(self, hovering: bool):
-        # when the hover state is changed, update the background
-        BoxWidget.hovering.fset(self, hovering)
-        self._refresh_background()
-
-    @BoxWidget.clicking.setter
-    def clicking(self, clicking: bool):
-        # when the clicking state is changed, update the background
-        BoxWidget.clicking.fset(self, clicking)
-        self._refresh_background()
+        self.label.x, self.label.y = self.center
 
     # event
 
diff --git a/source/gui/widget/Checkbox.py b/source/gui/widget/Checkbox.py
index 59aaeb8..6dff2ad 100644
--- a/source/gui/widget/Checkbox.py
+++ b/source/gui/widget/Checkbox.py
@@ -34,6 +34,8 @@ class Checkbox(BoxWidget):
 
         self.state = state
 
+        self.add_listener("on_click_release", lambda *_: self.swap_state())
+
         self._refresh_size()
 
     # refreshing
@@ -60,14 +62,13 @@ class Checkbox(BoxWidget):
         self._state = state
         self._refresh_tick()
 
+    def swap_state(self):
+        self.state = not self.state  # inverse l'état
+
     # event
 
     def on_resize(self, width: int, height: int):
         self._refresh_size()
 
-    def on_release(self, rel_x: int, rel_y: int, button: int, modifiers: int):
-        # lorsque le bouton est enclenché, inverse son état
-        self.state = not self.state
-
     def draw(self):
         self.tick.draw()
diff --git a/source/gui/widget/GameGrid.py b/source/gui/widget/GameGrid.py
index d21e489..75a920c 100644
--- a/source/gui/widget/GameGrid.py
+++ b/source/gui/widget/GameGrid.py
@@ -49,6 +49,11 @@ class GameGrid(BoxWidget):
             **dict_prefix("cursor_", kwargs)
         )
 
+        self.add_listener("on_hover_leave", lambda *_: self.hide_cursor())
+        self.add_listener("on_hover", self._refresh_cursor)
+        self.add_listener("on_click_release",
+                          lambda rel_x, rel_y, *_: print("click", self.get_cell_from_rel(rel_x, rel_y)))
+
         self._refresh_size()
 
     def get_cell_from_rel(self, rel_x: int, rel_y: int) -> tuple[int, int]:
@@ -68,14 +73,24 @@ class GameGrid(BoxWidget):
             line.x = self.x + self.cell_width * column
             line.x2 = line.x
             line.y = self.y
-            line.y2 = self.y + self.height
+            line.y2 = self.y2
 
         for row, line in enumerate(self.lines[-self._rows+1:], start=1):
             line.x = self.x
-            line.x2 = self.x + self.width
+            line.x2 = self.x2
             line.y = self.y + self.cell_height * row
             line.y2 = line.y
 
+    def _refresh_cursor(self, rel_x: int, rel_y: int):
+        cell_x, cell_y = self.get_cell_from_rel(rel_x, rel_y)
+
+        self.cursor.x = self.x + cell_x * self.width / self._columns
+        self.cursor.y = self.y + cell_y * self.height / self._rows
+        self.cursor.width, self.cursor.height = self.cell_size
+
+    def hide_cursor(self):
+        self.cursor.width, self.cursor.height = 0, 0
+
     # property
 
     @property
@@ -92,19 +107,6 @@ class GameGrid(BoxWidget):
 
     # event
 
-    def on_hover(self, rel_x: int, rel_y: int):
-        cell_x, cell_y = self.get_cell_from_rel(rel_x, rel_y)
-
-        self.cursor.x = self.x + cell_x * self.width / self._columns
-        self.cursor.y = self.y + cell_y * self.height / self._rows
-        self.cursor.width, self.cursor.height = self.cell_size
-
-    def on_hover_leave(self, rel_x: int, rel_y: int):
-        self.cursor.width, self.cursor.height = 0, 0
-
-    def on_release(self, rel_x: int, rel_y: int, button: int, modifiers: int):
-        print("click", (rel_x, rel_y), self.get_cell_from_rel(rel_x, rel_y))
-
     def on_resize(self, width: int, height: int):
         self._refresh_size()
 
diff --git a/source/gui/widget/Input.py b/source/gui/widget/Input.py
index 7cfac8d..e1fc693 100644
--- a/source/gui/widget/Input.py
+++ b/source/gui/widget/Input.py
@@ -47,6 +47,8 @@ class Input(BoxWidget):
             **dict_prefix("label_", kwargs)
         )
 
+        self.add_listener("on_activate_change", lambda *_: self._refresh_background())
+
         self._refresh_size()
 
     # background
@@ -76,13 +78,7 @@ class Input(BoxWidget):
         self.background.width, self.background.height = self.size
 
         # center the label
-        self.label.x = self.x + (self.width / 2)
-        self.label.y = self.y + (self.height / 2)
-
-    @BoxWidget.activated.setter
-    def activated(self, activated: bool) -> None:
-        BoxWidget.activated.fset(self, activated)
-        self._refresh_background()
+        self.label.x, self.label.y = self.center
 
     # property
 
diff --git a/source/gui/widget/Scroller.py b/source/gui/widget/Scroller.py
index a9c4532..3151c18 100644
--- a/source/gui/widget/Scroller.py
+++ b/source/gui/widget/Scroller.py
@@ -48,6 +48,8 @@ class Scroller(BoxWidget):
             **dict_prefix("label_", kwargs)
         )
 
+        self.add_listener("on_click_release", lambda rel_x, *_: self._refresh_cursor(rel_x))
+
         self._from = from_
         self._to = to
         self.value = value
@@ -73,15 +75,14 @@ class Scroller(BoxWidget):
         )
 
         # label
-        self.label.x = self.x + (self.width / 2)
-        self.label.y = self.y + (self.height / 2)
+        self.label.x, self.label.y = self.center
         self.label.text = str(self.text_transform(self.value))
 
-    # property
-
-    def on_pressed(self, rel_x: int, rel_y: int, button: int, modifiers: int):
+    def _refresh_cursor(self, rel_x: int):
         self.value = rel_x / self.width
 
+    # property
+
     @property
     def value(self):
         return self._value
diff --git a/source/gui/widget/abc/BoxWidget.py b/source/gui/widget/abc/BoxWidget.py
index 1cf53cc..fc614c4 100644
--- a/source/gui/widget/abc/BoxWidget.py
+++ b/source/gui/widget/abc/BoxWidget.py
@@ -27,9 +27,9 @@ class BoxWidget(Widget, ABC):
         self.width = width
         self.height = height
 
-        self._hovering = False  # is the button currently hovered ?
-        self._clicking = False  # is the button currently clicked ?
-        self._activated = False  # is the button activated ? (the last click was inside this widget)
+        self.hovering = False  # is the button currently hovered ?
+        self.clicking = False  # is the button currently clicked ?
+        self.activated = False  # is the button activated ? (the last click was inside this widget)
 
     # property
 
@@ -64,6 +64,22 @@ class BoxWidget(Widget, ABC):
     def y(self, y: Distance):
         self._y = y
 
+    @property
+    def xy(self) -> tuple[int, int]:
+        return self.x, self.y
+
+    @property
+    def x2(self) -> int:
+        return self.x + self.width
+
+    @property
+    def y2(self) -> int:
+        return self.y + self.height
+
+    @property
+    def xy2(self) -> tuple[int, int]:
+        return self.x2, self.y2
+
     @property
     def width(self) -> int:
         return self._getter_distance(self.scene.window.width, self._width)
@@ -80,47 +96,29 @@ class BoxWidget(Widget, ABC):
     def height(self, height: Optional[Distance]):
         self._height = height
 
-    @property
-    def xy(self) -> tuple[int, int]:
-        return self.x, self.y
-
     @property
     def size(self) -> tuple[int, int]:
         return self.width, self.height
 
     @property
     def bbox(self) -> tuple[int, int, int, int]:
-        return self.x, self.y, self.x + self.width, self.y + self.height
-
-    # property that can be used to add event when these value are modified in some specific widget.
+        return self.x, self.y, self.x2, self.y2
 
     @property
-    def hovering(self):
-        return self._hovering
-
-    @hovering.setter
-    def hovering(self, hovering: bool):
-        self._hovering = hovering
+    def center_x(self) -> float:
+        return self.x + (self.width / 2)
 
     @property
-    def clicking(self):
-        return self._clicking
-
-    @clicking.setter
-    def clicking(self, clicking: bool):
-        self._clicking = clicking
+    def center_y(self) -> float:
+        return self.y + (self.height / 2)
 
     @property
-    def activated(self):
-        return self._activated
-
-    @activated.setter
-    def activated(self, activated: bool):
-        self._activated = activated
+    def center(self) -> tuple[float, float]:
+        return self.center_x, self.center_y
 
     # event
 
-    def on_mouse_motion(self, x: int, y: int, dx: int, dy: int):  # NOQA
+    def on_mouse_motion(self, x: int, y: int, dx: int, dy: int):
         """
         When the mouse is moved, this event is triggered.
         Allow the implementation of the on_hover_enter and on_hover_leave events
@@ -130,60 +128,44 @@ class BoxWidget(Widget, ABC):
         :dy: the difference of the y mouse axis
         """
 
+        rel_x, rel_y = x - self.x, y - self.y
+
         old_hovering = self.hovering
         self.hovering = in_bbox((x, y), self.bbox)
 
-        rel_x, rel_y = x - self.x, y - self.y
-
         if old_hovering != self.hovering:  # if the hover changed
-            if self.hovering: self.on_hover_enter(rel_x, rel_y)  # call the hover enter event
-            else: self.on_hover_leave(rel_x, rel_y)  # call the hover leave event
+            # call the hover changed event
+            self.trigger_event("on_hover_change", rel_x, rel_y)
+            # call the hover enter / leave event
+            self.trigger_event("on_hover_enter" if self.hovering else "on_hover_leave", rel_x, rel_y)
 
         if self.hovering:  # if the mouse motion is inside the collision
-            self.on_hover(rel_x, rel_y)  # call the hover event
-
-    def on_hover(self, rel_x: int, rel_y: int):
-        """
-        This event is called when the mouse move in the bbox of the widget
-        """
-
-    def on_hover_enter(self, rel_x: int, rel_y: int):
-        """
-        This event is called when the mouse enter the bbox of the widget
-        """
-
-    def on_hover_leave(self, rel_x: int, rel_y: int):
-        """
-        This event is called when the mouse leave the bbox of the widget
-        """
+            self.trigger_event("on_hover", rel_x, rel_y)  # call the hover event
 
     def on_mouse_press(self, x: int, y: int, button: int, modifiers: int):
-        # if this button was the one hovered when the click was pressed
+        rel_x, rel_y = x - self.x, y - self.y
 
-        if not in_bbox((x, y), self.bbox):
-            self.activated = False  # if the click was not in the bbox, disable the activated state
-            return
+        self.activated = in_bbox((x, y), self.bbox)
+        self.trigger_event("on_activate_change", rel_x, rel_y, button, modifiers)
 
-        self.activated = True  # if the click is inside the bbox, enable the activated state
-        self.clicking = True  # the widget is now clicked
+        if self.activated:  # if the click was inside the widget
+            self.trigger_event("on_activate_enter", rel_x, rel_y, button, modifiers)
 
-        self.on_pressed(x - self.x, y - self.y, button, modifiers)
+            self.clicking = True  # the widget is also now clicked
+            self.trigger_event("on_click_change", rel_x, rel_y, button, modifiers)
+            self.trigger_event("on_click_press", rel_x, rel_y, button, modifiers)
+
+        else:
+            self.trigger_event("on_activate_leave", rel_x, rel_y, button, modifiers)
 
     def on_mouse_release(self, x: int, y: int, button: int, modifiers: int):
-        old_click: bool = self._clicking
+        rel_x, rel_y = x - self.x, y - self.y
+
+        old_click: bool = self.clicking
         self.clicking = False  # the widget is no longer clicked
 
-        if not in_bbox((x, y), self.bbox): return
+        if not in_bbox((x, y), self.bbox): return  # if the release was not in the collision, ignore
 
-        # if this button was the one hovered when the click was pressed
-        if old_click: self.on_release(x - self.x, y - self.y, button, modifiers)
-
-    def on_pressed(self, rel_x: int, rel_y: int, button: int, modifiers: int):
-        """
-        This event is called when the bbox is pressed
-        """
-
-    def on_release(self, rel_x: int, rel_y: int, button: int, modifiers: int):
-        """
-        This event is called when the bbox is released
-        """
\ No newline at end of file
+        if old_click:  # if this button was the one hovered when the click was pressed
+            self.trigger_event("on_click_change", rel_x, rel_y, button, modifiers)
+            self.trigger_event("on_click_release", rel_x, rel_y, button, modifiers)
diff --git a/source/gui/widget/abc/Widget.py b/source/gui/widget/abc/Widget.py
index 590272e..a801deb 100644
--- a/source/gui/widget/abc/Widget.py
+++ b/source/gui/widget/abc/Widget.py
@@ -1,11 +1,13 @@
 from abc import ABC, abstractmethod
 from typing import TYPE_CHECKING
 
+from source.event import Listener
+
 if TYPE_CHECKING:
     from source.gui.scene.abc import Scene
 
 
-class Widget(ABC):
+class Widget(Listener, ABC):
     """
     A Widget that can be attached to a scene.
 
@@ -13,6 +15,8 @@ class Widget(ABC):
     """
 
     def __init__(self, scene: "Scene", **kwargs):
+        super().__init__()
+
         self.scene = scene
 
     @abstractmethod