ui/ncurses: Abstract text-screen code from sysinfo screen

[petitboot] / ui / ncurses / nc-textscreen.c

diff --git a/ui/ncurses/nc-textscreen.c b/ui/ncurses/nc-textscreen.c
new file mode 100644 (file)
index 0000000..3b0d01d
--- /dev/null
+++ b/ui/ncurses/nc-textscreen.c
@@ -0,0 +1,167 @@
+/*
+ *  Copyright (C) 2013 IBM Corporation
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
+
+#include <string.h>
+
+#include <talloc/talloc.h>
+#include <types/types.h>
+#include <log/log.h>
+#include <util/util.h>
+
+#include "nc-cui.h"
+#include "nc-textscreen.h"
+
+struct text_screen *text_screen_from_scr(struct nc_scr *scr)
+{
+       struct text_screen *text_screen;
+       assert(scr->sig == pb_text_screen_sig);
+       text_screen = container_of(scr, struct text_screen, scr);
+       return text_screen;
+}
+
+void text_screen_draw(struct text_screen *screen)
+{
+       int max_y, i;
+
+       max_y = getmaxy(screen->scr.sub_ncw);
+
+       max_y = min(max_y, screen->scroll_y + screen->n_lines);
+
+       for (i = screen->scroll_y; i < max_y; i++)
+               mvwaddstr(screen->scr.sub_ncw, i, 1, screen->lines[i]);
+
+       wrefresh(screen->scr.sub_ncw);
+}
+
+static void text_screen_scroll(struct text_screen *screen, int key)
+{
+       int win_lines = getmaxy(screen->scr.sub_ncw);
+       int delta;
+
+       if (key == KEY_UP)
+               delta = -1;
+       else if (key == KEY_DOWN)
+               delta = 1;
+       else
+               return;
+
+       if (screen->scroll_y + delta < 0)
+               return;
+       if (screen->scroll_y + delta + win_lines > screen->n_lines)
+               return;
+
+       screen->scroll_y += delta;
+       wscrl(screen->scr.sub_ncw, delta);
+
+       if (delta > 0) {
+               mvwaddstr(screen->scr.sub_ncw, win_lines - 1, 1,
+                               screen->lines[screen->scroll_y+win_lines-1]);
+       } else if (delta < 0) {
+               mvwaddstr(screen->scr.sub_ncw, 0, 1,
+                               screen->lines[screen->scroll_y]);
+       }
+
+       wrefresh(screen->scr.sub_ncw);
+}
+
+void text_screen_clear(struct text_screen *screen)
+{
+       talloc_free(screen->lines);
+       screen->n_lines = 0;
+       screen->n_alloc_lines = 16;
+       screen->lines = talloc_array(screen, char *, screen->n_alloc_lines);
+}
+
+void text_screen_append_line(struct text_screen *screen, const char *fmt, ...)
+{
+       char *line;
+       va_list ap;
+
+       if (fmt) {
+               va_start(ap, fmt);
+               line = talloc_vasprintf(screen->lines, fmt, ap);
+               va_end(ap);
+       } else {
+               line = "";
+       }
+
+       if (screen->n_lines == screen->n_alloc_lines) {
+               screen->n_alloc_lines *= 2;
+               screen->lines = talloc_realloc(screen, screen->lines,
+                                               char *, screen->n_alloc_lines);
+       }
+
+       screen->lines[screen->n_lines] = line;
+       screen->n_lines++;
+}
+
+
+void text_screen_process_key(struct nc_scr *scr, int key)
+{
+       struct text_screen *screen = text_screen_from_scr(scr);
+
+       switch (key) {
+       case 'x':
+               screen->on_exit(screen->cui);
+               break;
+       case KEY_DOWN:
+       case KEY_UP:
+               text_screen_scroll(screen, key);
+               break;
+       default:
+               break;
+       }
+}
+
+static void text_screen_resize(struct nc_scr *scr)
+{
+       struct text_screen *screen = text_screen_from_scr(scr);
+       text_screen_draw(screen);
+}
+
+struct nc_scr *text_screen_scr(struct text_screen *screen)
+{
+       return &screen->scr;
+}
+
+static int text_screen_post(struct nc_scr *scr)
+{
+       nc_scr_frame_draw(scr);
+       redrawwin(scr->main_ncw);
+       wrefresh(scr->main_ncw);
+       return 0;
+}
+
+void text_screen_init(struct text_screen *screen, struct cui *cui,
+               const char *title, void (*on_exit)(struct cui *))
+{
+       nc_scr_init(&screen->scr, pb_text_screen_sig, 0,
+                       cui, text_screen_process_key,
+                       text_screen_post, NULL, text_screen_resize);
+
+       screen->cui = cui;
+       screen->on_exit = on_exit;
+
+       screen->scr.frame.ltitle = talloc_strdup(screen, title);
+       screen->scr.frame.rtitle = NULL;
+       screen->scr.frame.help = "x=exit";
+       scrollok(screen->scr.sub_ncw, true);
+}