sheet.h

#ifndef SHEET_H
#define SHEET_H

#define SHEET_MAX_ROWS (16 * 1024)
#define SHEET_MAX_COLS 256

typedef GList ColStyleList;

struct Workbook;

typedef struct {
	GtkWidget  *toplevel;
	GtkWidget  *notebook;
	GtkWidget  *table;

	/* Edit area */
	GtkWidget  *ea_status;
	GtkWidget  *ea_button_box;
	GtkWidget  *ea_input;

	/* The auto-expression */
	ExprTree   *auto_expr;
	GnomeCanvasItem  *auto_expr_label;
	
	/* Styles */
	Style      style;
	GHashTable *sheets;	/* keeps a list of the Sheets on this workbook */

	/* A list with all of the formulas */
	GList      *formula_cell_list;

	/* A queue with the cells to be evaluated */
	GList      *eval_queue;
	int        max_iterations;
} Workbook;

typedef struct {
	int        base_col, base_row;
	int        start_col, start_row;
	int        end_col, end_row;
} SheetSelection;

typedef struct {
	int        signature;
	
	Workbook   *workbook;
	GtkWidget  *toplevel, *col_canvas, *row_canvas;
	GtkWidget  *sheet_view;
	GnomeCanvasItem *col_item, *row_item;
	
	double     last_zoom_factor_used;
	char       *name;
		   
	Style      style;

	ColRowInfo default_col_style;
	GList      *cols_info;

	ColRowInfo default_row_style;
	GList      *rows_info;

	GHashTable *cell_hash;	/* The cells in hashed format */

	GList      *selections;

	/* Scrolling information */
	GtkWidget  *vs, *hs;	/* The scrollbars */
	GtkObject  *va, *ha;    /* The adjustments */
	
	int        max_col_used;
	int        max_row_used;

	/* The list of formulas */
	GList      *formula_cell_list;
} Sheet;

#define SHEET_SIGNATURE 0x12349876
#define IS_SHEET(x) (((Sheet *) x)->signature == SHEET_SIGNATURE)

typedef  void (*sheet_col_row_callback)(Sheet *sheet, ColRowInfo *ci,
					void *user_data);

typedef  int (*sheet_cell_foreach_callback)(Sheet *sheet, int col, int row,
					    Cell *cell, void *user_data);

Sheet      *sheet_new                 (Workbook *wb, char *name);
void        sheet_destroy             (Sheet *sheet);
void        sheet_foreach_col         (Sheet *sheet, sheet_col_row_callback, void *user_data);
void        sheet_foreach_row         (Sheet *sheet, sheet_col_row_callback, void *user_data);
void        sheet_set_zoom_factor     (Sheet *sheet, double factor);
void        sheet_get_cell_bounds     (Sheet *sheet, ColType col, RowType row, int *x, int *y, int *w, int *h);

/* Selection management */
void        sheet_select_all             (Sheet *sheet);
void        sheet_selection_append       (Sheet *sheet, int col, int row);
void        sheet_selection_extend_to    (Sheet *sheet, int col, int row);
void        sheet_selection_clear        (Sheet *sheet);
void        sheet_selection_clear_only   (Sheet *sheet);
int         sheet_selection_equal        (SheetSelection *a, SheetSelection *b);
void        sheet_selection_append_range (Sheet *sheet, int base_col,  int base_row,
					  int start_col, int start_row,
					  int end_col,   int end_row);

void        sheet_selection_extend_horizontal (Sheet *sheet, int count);
void        sheet_selection_extend_vertical   (Sheet *sheet, int count);
int         sheet_selection_is_cell_selected  (Sheet *sheet, int col, int row);

/* Computation */
void        sheet_compute_cell        (Sheet *sheet, Cell *cell);

/* Cell management */
Cell       *sheet_cell_new            (Sheet *sheet, int col, int row);
int         sheet_cell_foreach_range  (Sheet *sheet, int only_existing,
				       int start_col, int start_row,
				       int end_col, int end_row,
				       sheet_cell_foreach_callback callback,
				       void *closure);
Cell       *sheet_cell_get            (Sheet *sheet, int col, int row);

/* Create new ColRowInfos from the default sheet style */
ColRowInfo *sheet_col_new             (Sheet *sheet);
ColRowInfo *sheet_row_new             (Sheet *sheet);
int         sheet_row_check_bound     (int row, int diff);
int         sheet_col_check_bound     (int col, int diff);

/* Duplicates the information of a col/row */
ColRowInfo *sheet_duplicate_colrow    (ColRowInfo *original);

/* Retrieve information from a col/row */
ColRowInfo *sheet_col_get_info        (Sheet *sheet, int col);
ColRowInfo *sheet_row_get_info        (Sheet *sheet, int row);

/* Returns a pointer to a ColRowInfo: existed or freshly created */
ColRowInfo *sheet_row_get             (Sheet *sheet, int pos);
ColRowInfo *sheet_col_get             (Sheet *sheet, int pos);

/* Add a ColRowInfo to the Sheet */
void        sheet_col_add             (Sheet *sheet, ColRowInfo *cp);
void        sheet_row_add             (Sheet *sheet, ColRowInfo *cp);

/* Measure distances in pixels from one col/row to another */
int         sheet_col_get_distance    (Sheet *sheet, int from_col, int to_col);
int         sheet_row_get_distance    (Sheet *sheet, int from_row, int to_row);

/* Sets the width/height of a column row in terms of pixels */
void        sheet_col_set_width       (Sheet *sheet, int col, int width);
void        sheet_row_set_height      (Sheet *sheet, int row, int width);
void        sheet_col_set_selection   (Sheet *sheet, ColRowInfo *ci, int value);
void        sheet_row_set_selection   (Sheet *sheet, ColRowInfo *ri, int value);

Style      *sheet_style_compute       (Sheet *sheet, int col, int row);

/* Redraw */
void        sheet_redraw_cell_region  (Sheet *sheet, int start_col, int start_row,
				       int end_col, int end_row);
void        sheet_redraw_selection    (Sheet *sheet, SheetSelection *ss);
void        sheet_redraw_all          (Sheet *sheet);

/*
 * Workbook
 */
Workbook   *workbook_new                 (void);
Workbook   *workbook_new_with_sheets     (int sheet_count);
void        workbook_attach_sheet        (Workbook *, Sheet *);
Sheet      *workbook_focus_current_sheet (Workbook *wb);
Sheet      *workbook_get_current_sheet   (Workbook *wb);

/*
 * Does any pending recalculations
 */
void        workbook_recalc              (Workbook *wb);

/*
 * Callback routine: invoked when the first view ItemGrid
 * is realized to allocate the default styles
 */
void     workbook_realized            (Workbook *, GdkWindow *);

extern   Workbook *current_workbook;
#endif