add remove point

src/main.rs

@@ -57,6 +57,7 @@ enum Message {
     LengthChange(String),
     ChangeDelta(f32),
     AddPoint,
+    RemovePoint,
 }
 
 struct MyApp {
@@ -173,6 +174,9 @@ impl MyApp {
             Message::AddPoint => {
                 self.music.add_point(self.current_delta);
             }
+            Message::RemovePoint => {
+                self.music.remove_point(self.current_delta);
+            }
         }
     }
 
@@ -315,7 +319,8 @@ impl MyApp {
                         delta_to_string(self.music.length)
                     ))
                     .size(20.0),
-                    button("Add Point").on_press(Message::AddPoint)
+                    button("Add Point").on_press(Message::AddPoint),
+                    button("Remove Point").on_press(Message::RemovePoint),
                 ]
                 .spacing(20),
                 column![