added custom signals

_subsections/sec03/lesson-11.org

@@ -4,7 +4,8 @@
 
 * Links
 - [[../../toc.org][TOC - Godot Notes]]
-- [[https://www.udemy.com/course/jumpstart-to-2d-game-development-godot-4-for-beginners/learn/lecture/45070477#announcements][S03:L20.11 - Signals]]
+- [[https://www.udemy.com/course/jumpstart-to-2d-game-development-godot-4-for-beginners/learn/lecture/45070477#announcements][S03:L22.11 - Signals]]
+- [[https://www.udemy.com/course/jumpstart-to-2d-game-development-godot-4-for-beginners/learn/lecture/45070479#announcements][S03:L23.12 - Custom Signals]]
 
 * Notes
 ** signals
@@ -43,3 +44,31 @@
      -
           #+ATTR_HTML: :width 600px
           [[file:../../../_share/media/albert/img/section03/S03_L11_EX03.png]]
+
+** Custom Signals
+*** declare the signal
+to create a signal, use the following format:
+ #+BEGIN_SRC godot
+ signal name_of_signal
+ #+END_SRC
+
+*** activate the signal
+#+BEGIN_SRC godot
+name_of_signal.emit()
+#+END_SRC
+
+*** register to signal
+- go to the scene you want to attach the signal to
+- pick the node
+- the signal should be available under Inspector->Node->Signals
+- connect the signal, and give the function a name you want, this will be your receiver function
+  - if you want to attach another node to the same receiver function, use "pick" when connecting the signal
+    -
+        #+ATTR_HTML: :width 700px
+        [[file:../../../_share/media/albert/img/section03/S03_L12_EX01.png]]
+
+- if you have more than one node connected to a receiver function you can see which are connected by clicking on the green icon next to the receiver function
+
+  -
+    #+ATTR_HTML: :width 600px
+    [[file:../../../_share/media/albert/img/section03/S03_L12_EX02.png]]