window.h

   1 /*
   2  * Copyright 2004-2005 Timo Hirvonen
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  17  * 02111-1307, USA.
  18  */
  19
  20 #ifndef _WINDOW_H
  21 #define _WINDOW_H
  22
  23 #include "iter.h"
  24
  25 /*
  26  * window contains list of rows
  27  * - the list is double linked circular list
  28  * - head contains no data. head is not a real row
  29  * - head->prev gets the last row (or head if the list is empty) in the list
  30  * - head->next gets the first row (or head if the list is empty) in the list
  31  *
  32  * get_prev(&iter) always stores prev row to the iter
  33  * get_next(&iter) always stores next row to the iter
  34  *
  35  * these return 1 if the new row is real row (not head), 0 otherwise
  36  *
  37  * sel_changed callback is called if not NULL and selection has changed
  38  */
  39
  40 struct window {
  41         /* head of the row list */
  42         struct iter head;
  43
  44         /* top row */
  45         struct iter top;
  46
  47         /* selected row */
  48         struct iter sel;
  49
  50         /* window height */
  51         int nr_rows;
  52
  53         unsigned changed : 1;
  54
  55         /* return 1 if got next/prev, otherwise 0 */
  56         int (*get_prev)(struct iter *iter);
  57         int (*get_next)(struct iter *iter);
  58         void (*sel_changed)(void);
  59 };
  60
  61 extern struct window *window_new(int (*get_prev)(struct iter *), int (*get_next)(struct iter *));
  62 extern void window_free(struct window *win);
  63 extern void window_set_empty(struct window *win);
  64 extern void window_set_contents(struct window *win, void *head);
  65
  66 /* call this after rows were added to window or order of rows was changed.
  67  * top and sel MUST point to valid rows (or window must be empty, but then
  68  * why do you want to call this function :)).
  69  *
  70  * if you remove row from window then call window_row_vanishes BEFORE removing
  71  * the row instead of this function.
  72  */
  73 extern void window_changed(struct window *win);
  74
  75 /* call this BEFORE row is removed from window */
  76 extern void window_row_vanishes(struct window *win, struct iter *iter);
  77
  78 extern int window_get_top(struct window *win, struct iter *iter);
  79 extern int window_get_sel(struct window *win, struct iter *iter);
  80 extern int window_get_prev(struct window *win, struct iter *iter);
  81 extern int window_get_next(struct window *win, struct iter *iter);
  82
  83 /* set selected row */
  84 extern void window_set_sel(struct window *win, struct iter *iter);
  85
  86 extern void window_set_nr_rows(struct window *win, int nr_rows);
  87 extern void window_up(struct window *win, int rows);
  88 extern void window_down(struct window *win, int rows);
  89 extern void window_goto_top(struct window *win);
  90 extern void window_goto_bottom(struct window *win);
  91 extern void window_page_up(struct window *win);
  92 extern void window_page_down(struct window *win);
  93
  94 extern int window_get_nr_rows(struct window *win);
  95
  96 #endif