Updated Launcher documentation WIP (markdown)

Launcher-documentation-WIP.md

@@ -17,7 +17,7 @@ A Launcher Screen (shorted to `LScreen`) consists of the following members:
 
 TODO: Talk about LScreen_Reset somewhere
 
-### Required members
+## Required members
 
 #### `void (*Init)(struct LScreen* s)`
 
@@ -29,38 +29,43 @@ At a minimum, the `widgets` and `numWidgets` members must be initialised here
 
 Points to an array containing pointers to the widgets in the screen
 
-Example:
+#### `int numWidgets`
+
+Number of widgets in the screen
+
+### Example:
 ```C
 static struct LWidget* simpleScreen_widgets[] = {
 	(struct LWidget*)&SimpleScreen.iptField,
 	(struct LWidget*)&SimpleScreen.btnBack
 };
-...
-s->widgets = simpleScreen_widgets;
+
+void SimpleScreen_Init(struct LScreen* s) {
+	s->widgets    = simpleScreen_widgets;
+	s->numWidgets = Array_Elems(simpleScreen_widgets);
+	...
+}
 ```
 
-#### `int numWidgets`
-
-Number of widgets in the screen
-
-Example:
-```C
-s->numWidgets = Array_Elems(simpleScreen_widgets);
-```
-
-### Optional members
-
-TODO
+## Optional members - general
 
 #### `void (*Show)(struct LScreen* s)`
 
+Optional. Called every time this screen appears. (i.e. switching to this screen)
+
 #### `void (*Free)(struct LScreen* s)`
 
+Optional. Called every time this screen disappears. (i.e. switching to another screen)
+
 #### `void (*Layout)(struct LScreen* s)`
 
+Optional. Can be used to customise widget layout, but usually it's unnecessary to override the default method
+
 #### `void (*Tick)(struct LScreen* s)`
 
-#### `void (*DrawBackground)(struct LScreen* s, struct Context2D* ctx)`
+Optional. Can be used to implement functionality that required periodic checking
+
+## Optional members - input
 
 #### `void (*KeyDown)(struct LScreen* s,     int key, cc_bool wasDown)`
 
@@ -68,16 +73,24 @@ TODO
 
 #### `void (*MouseWheel)(struct LScreen* s,  float delta)`
 
-#### `void (*ResetArea)(struct Context2D* ctx, int x, int y, int width, int height)`
-
 #### `struct LWidget* onEnterWidget`
 
+Optional. Can be used to set the widget automatically clicked on when `Enter` is pressed and no other interactable widget is hovered over.
+
 #### `struct LWidget* hoveredWidget`
 
 #### `struct LWidget* selectedWidget`
 
+## Optional members - drawing
+
+#### `void (*DrawBackground)(struct LScreen* s, struct Context2D* ctx)`
+
+#### `void (*ResetArea)(struct Context2D* ctx, int x, int y, int width, int height)`
+
 #### `const char* title`
 
+TODO: this is kinda required usually... ?
+
 
 How a launcher screen works
 
@@ -90,9 +103,13 @@ Background drawing
 
 TODO
 
+TODO mention interactable widgets
+
 ## Widget layout / positioning
 
-TODO. talk about anchoring and offsets
+TODO. talk about anchoring and offsets. maybe move to screen?
+
+example image of all the different anchors/offsets
 
 ## Widget types
 
@@ -110,6 +127,7 @@ TODO. talk about anchoring and offsets
 
 TODO
 
+TODO mention how struct declarion works. maybe should be in earlier section?
 
 Example usage:
 ```C