git.ozlabs.org Git - petitboot/blob - ui/ncurses/nc-textscreen.c

   1 /*
   2  *  Copyright (C) 2013 IBM Corporation
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; version 2 of the License.
   7  *
   8  *  This program is distributed in the hope that it will be useful,
   9  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *  GNU General Public License for more details.
  12  *
  13  *  You should have received a copy of the GNU General Public License
  14  *  along with this program; if not, write to the Free Software
  15  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16  */
  17
  18 #if defined(HAVE_CONFIG_H)
  19 #include "config.h"
  20 #endif
  21
  22 #include <string.h>
  23
  24 #include <talloc/talloc.h>
  25 #include <types/types.h>
  26 #include <log/log.h>
  27 #include <util/util.h>
  28
  29 #include "nc-cui.h"
  30 #include "nc-textscreen.h"
  31
  32 struct text_screen *text_screen_from_scr(struct nc_scr *scr)
  33 {
  34         struct text_screen *text_screen;
  35         assert(scr->sig == pb_text_screen_sig);
  36         text_screen = container_of(scr, struct text_screen, scr);
  37         return text_screen;
  38 }
  39
  40 void text_screen_draw(struct text_screen *screen)
  41 {
  42         int max_y, i;
  43
  44         max_y = getmaxy(screen->scr.sub_ncw);
  45
  46         max_y = min(max_y, screen->scroll_y + screen->n_lines);
  47
  48         for (i = screen->scroll_y; i < max_y; i++)
  49                 mvwaddstr(screen->scr.sub_ncw, i, 1, screen->lines[i]);
  50
  51         wrefresh(screen->scr.sub_ncw);
  52 }
  53
  54 static void text_screen_scroll(struct text_screen *screen, int key)
  55 {
  56         int win_lines = getmaxy(screen->scr.sub_ncw);
  57         int delta;
  58
  59         if (key == KEY_UP)
  60                 delta = -1;
  61         else if (key == KEY_DOWN)
  62                 delta = 1;
  63         else
  64                 return;
  65
  66         if (screen->scroll_y + delta < 0)
  67                 return;
  68         if (screen->scroll_y + delta + win_lines > screen->n_lines)
  69                 return;
  70
  71         screen->scroll_y += delta;
  72         wscrl(screen->scr.sub_ncw, delta);
  73
  74         if (delta > 0) {
  75                 mvwaddstr(screen->scr.sub_ncw, win_lines - 1, 1,
  76                                 screen->lines[screen->scroll_y+win_lines-1]);
  77         } else if (delta < 0) {
  78                 mvwaddstr(screen->scr.sub_ncw, 0, 1,
  79                                 screen->lines[screen->scroll_y]);
  80         }
  81
  82         wrefresh(screen->scr.sub_ncw);
  83 }
  84
  85 void text_screen_clear(struct text_screen *screen)
  86 {
  87         talloc_free(screen->lines);
  88         screen->n_lines = 0;
  89         screen->n_alloc_lines = 16;
  90         screen->lines = talloc_array(screen, char *, screen->n_alloc_lines);
  91 }
  92
  93 void text_screen_append_line(struct text_screen *screen, const char *fmt, ...)
  94 {
  95         char *line;
  96         va_list ap;
  97
  98         if (fmt) {
  99                 va_start(ap, fmt);
 100                 line = talloc_vasprintf(screen->lines, fmt, ap);
 101                 va_end(ap);
 102         } else {
 103                 line = "";
 104         }
 105
 106         if (screen->n_lines == screen->n_alloc_lines) {
 107                 screen->n_alloc_lines *= 2;
 108                 screen->lines = talloc_realloc(screen, screen->lines,
 109                                                 char *, screen->n_alloc_lines);
 110         }
 111
 112         screen->lines[screen->n_lines] = line;
 113         screen->n_lines++;
 114 }
 115
 116
 117 void text_screen_process_key(struct nc_scr *scr, int key)
 118 {
 119         struct text_screen *screen = text_screen_from_scr(scr);
 120
 121         switch (key) {
 122         case 'x':
 123                 screen->on_exit(screen->cui);
 124                 break;
 125         case KEY_DOWN:
 126         case KEY_UP:
 127                 text_screen_scroll(screen, key);
 128                 break;
 129         default:
 130                 break;
 131         }
 132 }
 133
 134 static void text_screen_resize(struct nc_scr *scr)
 135 {
 136         struct text_screen *screen = text_screen_from_scr(scr);
 137         text_screen_draw(screen);
 138 }
 139
 140 struct nc_scr *text_screen_scr(struct text_screen *screen)
 141 {
 142         return &screen->scr;
 143 }
 144
 145 static int text_screen_post(struct nc_scr *scr)
 146 {
 147         nc_scr_frame_draw(scr);
 148         redrawwin(scr->main_ncw);
 149         wrefresh(scr->main_ncw);
 150         return 0;
 151 }
 152
 153 void text_screen_init(struct text_screen *screen, struct cui *cui,
 154                 const char *title, void (*on_exit)(struct cui *))
 155 {
 156         nc_scr_init(&screen->scr, pb_text_screen_sig, 0,
 157                         cui, text_screen_process_key,
 158                         text_screen_post, NULL, text_screen_resize);
 159
 160         screen->cui = cui;
 161         screen->on_exit = on_exit;
 162
 163         screen->scr.frame.ltitle = talloc_strdup(screen, title);
 164         screen->scr.frame.rtitle = NULL;
 165         screen->scr.frame.help = "x=exit";
 166         scrollok(screen->scr.sub_ncw, true);
 167 }