Updated Launcher documentation WIP (markdown)

Launcher-documentation-WIP.md

@@ -1,13 +1,93 @@
-Launcher_SetScreen
+## Introduction
 
-- only one Screen can be active at a time
-- a Screen is composed of widgets
+In contrast to the in-game GUI, the Launcher only displays one Screen at a time
 
-LScreen
-- Init (required
-- Show (optional
-- Free (optional
+Each Screen is composed of a background and one or more Widgets:
 
+![image](https://github.com/UnknownShadow200/ClassiCube/assets/6509348/9dca96b6-6bea-4692-949d-347ac1073bda)
+
+You can use the following method to switch the active Screen:
+```C
+void Launcher_SetScreen(struct LScreen* screen);
+```
+
+Example usage:
+```C
+void SimpleScreen_SetActive(void) {
+	struct SimpleScreen* s = &SimpleScreen;
+	LScreen_Reset((struct LScreen*)s);
+	s->Init = SimpleScreen_Init;
+
+	s->title = "Title text";
+	Launcher_SetScreen((struct LScreen*)s);
+}
+```
+
+## What makes up a Launcher Screen
+
+A Launcher Screen (shorted to `LScreen`) consists of the following members:
+
+### Required members
+
+#### `void (*Init)(struct LScreen* s)`
+
+Called the first time this launcher screen is made active
+
+At a minimum, the `widgets` and `numWidgets` members must be initialised here
+
+#### `struct LWidget** widgets`
+
+Points to an array containing pointers to the widgets in the screen
+
+Example:
+```C
+static struct LWidget* simpleScreen_widgets[] = {
+	(struct LWidget*)&SimpleScreen.iptField,
+	(struct LWidget*)&SimpleScreen.btnBack
+};
+...
+s->widgets = simpleScreen_widgets;
+```
+
+#### `int numWidgets`
+
+Number of widgets in the screen
+
+Example:
+```C
+s->numWidgets = Array_Elems(simpleScreen_widgets);
+```
+
+### Optional members
+
+TODO
+
+#### `void (*Show)(struct LScreen* s)`
+
+#### `void (*Free)(struct LScreen* s)`
+
+#### `void (*Layout)(struct LScreen* s)`
+
+#### `void (*Tick)(struct LScreen* s)`
+
+#### `void (*DrawBackground)(struct LScreen* s, struct Context2D* ctx)`
+
+#### `void (*KeyDown)(struct LScreen* s,     int key, cc_bool wasDown)`
+
+#### `void (*MouseUp)(struct LScreen* s,     int idx)`
+
+#### `void (*MouseWheel)(struct LScreen* s,  float delta)`
+
+#### `void (*ResetArea)(struct Context2D* ctx, int x, int y, int width, int height)`
+
+#### `struct LWidget* onEnterWidget`
+
+#### `struct LWidget* hoveredWidget`
+
+#### `struct LWidget* selectedWidget`
+
+#### `const char* title`
+```
 
 How a launcher screen works
 
@@ -16,4 +96,23 @@ Showing
 
 Widget layout
 
-Background drawing
+Background drawing
+
+
+## Widgets
+
+TODO
+
+### Button widgets
+
+### Checkbox widgets
+
+### Input widgets
+
+### Label widgets
+
+### Slider widgets
+
+## Complete example
+
+TODO