Adding splitting screen and buffer switching

include/data.h

@@ -13,12 +13,50 @@
  * \param
  * */
 
-typedef struct erow {
+typedef struct frow {
   int size;     /**< Size of the line */
   int rsize;    /**< Size of the render line */
   char *chars;  /**< Characters of the line */
   char *render; /**< The actual line we will print */
-} erow;
+} frow;
+
+
+/**
+ * @brief Split modes for screen layout
+ */
+typedef enum {
+    SPLIT_NONE = 0,      // Single buffer fullscreen
+    SPLIT_VERTICAL,      // Left-right split
+    SPLIT_HORIZONTAL     // Top-bottom split
+} SplitMode;
+
+/**
+ * @brief Represents an editor viewport/pane
+ */
+typedef struct {
+    int buffer_id;        // Which buffer this pane displays
+    int start_row;        // Starting row on screen
+    int start_col;        // Starting column on screen
+    int height;           // Height of this pane
+    int width;            // Width of this pane
+    int cursor_x;         // Local cursor x in this pane
+    int cursor_y;         // Local cursor y in this pane
+  int rx, ry; 
+    int row_offset;       // Scroll offset for rows
+    int col_offset;       // Scroll offset for columns
+    int is_active;        // Is this pane currently active
+} EditorPane;
+
+/**
+ * @brief Screen layout manager
+ */
+typedef struct {
+    SplitMode mode;
+    EditorPane *panes;
+    int num_panes;
+    int active_pane;      // Index of active pane
+} ScreenLayout;
+
 
 typedef struct theme {
   char *BACKGROUND_COLOR;
@@ -31,7 +69,7 @@ typedef struct theme {
 
 } theme_t;
 
-enum editorStatus_e {
+enum bufferStatus_e {
   IDLE,
   READ_ONLY,
   READ_AND_WRITE,
@@ -60,8 +98,14 @@ struct buffer_t {
   enum buffer_type type;
   int buffer_id;
   int width, height;
-  int x, y; /**< Position of the buffer*/
+  int x, y; /**< Position in the buffer (cursor) */
+  frow *row;
+  int numrows;
   char *filename;
+  enum bufferStatus_e state;
+  int dirty;             /**< Has this buffer been modified since last save */
+  int row_offset;        /**< Scroll offset for rows in this buffer */
+  int col_offset;        /**< Scroll offset for columns in this buffer */
 };
 
 /**
@@ -69,17 +113,12 @@ struct buffer_t {
  * \brief Containing our editor state.
  */
 struct editorConfig {
-  int cursor_x, cursor_y; /**< Cursor position */
-  int rx;                 /**< Position in the render*/
-  int row_offset;         /**< Position scroll of lines */
-  int col_offset;         /**< Position scroll of colomns*/
   int screenrows;         /**< Terminal height*/
   int screencols;         /**< Terminal width*/
-  int numrows;            /**< Number of rows contained */
-  erow *row;              /**< Store all the rows printed */
+
+  ScreenLayout layout;
+  
   int dirty;
-  char *filename;
-  enum editorStatus_e state;
   int prefix_state;
   char status_msg[80];
   time_t status_msg_time;
@@ -102,7 +141,6 @@ struct editorConfig {
   int number_of_prefix;
 
   struct buffer_t buffers[64];
-  struct buffer_t ***screen_layout; /**< Which buffer is the current cell*/
   int number_of_buffer;
 
   theme_t theme;