Scratching out layout

source/UI/UI.h

@@ -0,0 +1,45 @@
+#pragma once
+#include <stdint.h>
+
+typedef enum {
+  SimplifiedHome,        // Basic home
+  SimplifiedHomeWarning, // Home with temp warning
+  DetailedHome,          // Detailed home view
+  DetailedHomeWarning,   // Home with temp warning
+  DebugMenu,             // Debugging metrics
+  settingsCategory,      // Settings category with icon
+  SettingsEntryBool,     // Tickbox setting
+  SettingsEntry3Number,  // Settings adjust with 3 number digits
+  SettingsEntry2Number,  // Settings adjust with 2 number digits
+  SettingsEntry1Number,  // Settings adjust with 2 number digits
+  SettingsEntry1Text,    // Setting with single text char for state
+  ScrollingText,         // Scrolling large text (warnings, help text)
+  SolderingMode,         // Basic soldering mode
+  DetailedSolderingMode, // Detailed soldering mode
+  NumberAdjust,          // Number adjust of number with <> either side
+} screenLayout_t;
+
+typedef void (*render_prep_fn)();
+typedef void (*tick_fn)();
+typedef void (*button_handler_fn)();
+
+typedef struct {
+  // on_enter
+  // on_exit
+  tick_fn           tick;
+  render_prep_fn    render_prepare;
+  screenLayout_t    layout; // Render layout used
+  button_handler_fn handle_button;
+} Screen_t;
+
+typedef union {
+  int32_t i32;
+  void   *ptr;
+} screen_arg_t;
+
+typedef struct {
+  screen_arg_t args[4];
+} ScreenContext_t;
+
+//
+void ui_render_screen(Screen_t *screen, ScreenContext_t *context);