src/display.h

   1 /*  $Header$
   2  *
   3  *  Copyright (c) 1987-2008 Sun Microsystems, Inc. All Rights Reserved.
   4  *  Copyright (c) 2008 Robert Ancell
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2, or (at your option)
   9  *  any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful, but
  12  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14  *  General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  19  *  02111-1307, USA.
  20  */
  21
  22 #ifndef DISPLAY_H
  23 #define DISPLAY_H
  24
  25 #include <glib.h>
  26
  27 #include "mp.h"
  28
  29 #define UNDO_HISTORY_LENGTH 16  /* Arithmetic mode undo history length */
  30 #define MAX_DISPLAY 512
  31
  32 /* Expression mode state */
  33 typedef struct {
  34     MPNumber ans;          /* Previously calculated answer */
  35     char *expression;      /* Expression entered by user */
  36     int cursor;
  37 } GCDisplayState;
  38
  39 /* Circular list of Arithmetic Precedence Mode states*/
  40 typedef struct {
  41   unsigned int begin;
  42   unsigned int end;
  43   unsigned int current;
  44   GCDisplayState e[UNDO_HISTORY_LENGTH];  /* Expression mode state */
  45 } GCDisplayHistory;
  46
  47 /* Number display mode. */
  48 typedef enum { ENG, FIX, SCI, MAXDISPMODES } DisplayFormat;
  49
  50 typedef struct
  51 {
  52     GCDisplayHistory h;   /* History of expression mode states */
  53     int show_tsep;        /* Set if the thousands separator should be shown. */
  54     int show_zeroes;      /* Set if trailing zeroes should be shown. */
  55     DisplayFormat format;  /* Number display mode. */
  56     int base;
  57 } GCDisplay;
  58
  59 void display_init(GCDisplay *);
  60 void display_set_accuracy(GCDisplay *display, int accuracy);
  61 void display_set_show_thousands_separator(GCDisplay *display, gboolean visible);
  62 void display_set_show_trailing_zeroes(GCDisplay *display, gboolean visible);
  63 void display_set_base(GCDisplay *display, int base);
  64 void display_set_format(GCDisplay *display, DisplayFormat format);
  65 void display_clear(GCDisplay *);
  66
  67 gboolean display_get_integer(GCDisplay *display, gint64 *value);
  68 gboolean display_get_unsigned_integer(GCDisplay *display, guint64 *value);
  69 MPNumber *display_get_answer(GCDisplay *);
  70 int display_get_cursor(GCDisplay *);
  71
  72 void display_set_number(GCDisplay *display, const MPNumber *);
  73 void display_set_answer(GCDisplay *display);
  74 void display_set_string(GCDisplay *display, const char *, int);
  75 void display_set_cursor(GCDisplay *display, int);
  76 void display_set_error(GCDisplay *display, const char *);
  77
  78 void display_clear_stack(GCDisplay *);
  79 void display_push(GCDisplay *);
  80 void display_pop(GCDisplay *);
  81 void display_unpop(GCDisplay *);
  82 gboolean display_is_undo_step(GCDisplay *display);
  83
  84 void display_insert(GCDisplay *display, int, const char *);
  85 void display_insert_at_cursor(GCDisplay *display, const char *);
  86 void display_insert_number(GCDisplay *display, int, const MPNumber *);
  87 void display_insert_number_at_cursor(GCDisplay *display, const MPNumber *value);
  88 void display_backspace(GCDisplay *);
  89 void display_delete(GCDisplay *);
  90 void display_surround(GCDisplay *display, const char *, const char *);
  91
  92 gboolean display_is_empty(GCDisplay *);
  93 gboolean display_is_result(GCDisplay *);
  94 gboolean display_is_usable_number(GCDisplay *display, MPNumber *);
  95
  96 int display_solve(GCDisplay *display, MPNumber *);
  97
  98 void display_make_number(GCDisplay *display, char *target, int target_len, const MPNumber *MPnumber, int base, int ignoreError);
  99
 100 #endif /* DISPLAY_H */