From 4b5873002e8a31dc686c69db4fce41bf3686fd6d Mon Sep 17 00:00:00 2001
From: Ekaitz Zarraga <ekaitz@elenq.tech>
Date: Sat, 23 Aug 2025 01:56:46 +0200
Subject: tui: Start to lay out the data structures

---
 src/tui-internals.h | 83 +++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 64 insertions(+), 19 deletions(-)

(limited to 'src/tui-internals.h')

diff --git a/src/tui-internals.h b/src/tui-internals.h
index c64964e..9469b47 100644
--- a/src/tui-internals.h
+++ b/src/tui-internals.h
@@ -20,25 +20,69 @@
 
 #include <termios.h>
 
-typedef struct _tui {
-  struct termios term_old_config;
-  struct termios term_config;
-} tui;
-
-typedef struct _mouse_event {
-  int x;
-  int y;
-} mouse_event;
-
-typedef struct _scroll_event {
-  int x;
-  int y;
-} scroll_event;
-
-typedef struct _key_event {
-  int key;
-  int modifiers;
-} key_event;
+typedef struct _vec2
+  {
+    int x;
+    int y;
+  }
+vec2;
+
+#define INPUT_BUFF_SIZE 100
+
+typedef struct _tui
+  {
+    struct termios term_old_config;
+    struct termios term_config;
+    char input_buff[INPUT_BUFF_SIZE]; /* For input events */
+
+    /* Double buffering of the display:
+     * We allocate a huge array, double the size we need and realloc it when
+     * needed. Then the top half is for the old display status and the bottom
+     * half is for the incoming. Then we flip.
+     */
+    int *display_A;
+    int *display_B;
+    vec2 display_size;
+  }
+tui;
+
+typedef struct _event_mouse
+  {
+    int key;
+    vec2 pos;
+  }
+event_mouse;
+
+typedef struct _event_scroll
+  {
+    int amount;
+  }
+event_scroll;
+
+typedef struct _event_key
+  {
+    int key;
+    int modifiers;
+  }
+event_key;
+
+typedef enum
+  {
+    EVENT_KEY,
+    EVENT_MOUSE,
+    EVENT_SCROLL
+  }
+event_type;
+
+typedef struct _event {
+  event_type type;
+  union
+    {
+      event_key key;
+      event_mouse mouse;
+      event_scroll scroll;
+    } data;
+} event;
 
 void tui_cursor_save (void);
 void tui_cursor_restore (void);
@@ -51,6 +95,7 @@ void tui_screen_erase (void);
 void tui_alternate_buffer_enable (void);
 void tui_alternate_buffer_disable (void);
 void tui_input_sequence_consume (void);
+
 tui *tui_init (void);
 void tui_deinit (tui *ui);
 void tui_loop (tui *ui);
-- 
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