1 /* demo_scankey.c - collate incoming ansi escape sequences.
2 *
3 * Copyright 2015 Rob Landley <[email protected]>
4 *
5 * TODO sigwinch
6
7 USE_DEMO_SCANKEY(NEWTOY(demo_scankey, 0, TOYFLAG_BIN))
8
9 config DEMO_SCANKEY
10 bool "demo_scankey"
11 default n
12 help
13 usage: demo_scankey
14
15 Move a letter around the screen. Hit ESC to exit.
16 */
17
18 #define FOR_demo_scankey
19 #include "toys.h"
20
demo_scankey_main(void)21 void demo_scankey_main(void)
22 {
23 time_t t[2];
24 unsigned width, height, tick;
25 char c = 'X', scratch[16];
26 int key, x, y;
27
28 t[0] = t[1] = x = tick = 0;
29 memset(scratch, 0, 16);
30 y = 1;
31
32 sigatexit(tty_sigreset); // Make ctrl-c restore tty
33 // hide cursor, reset color to default, clear screen
34 xputsn("\e[?25l\e0m\e[2J");
35 xset_terminal(1, 1, 0, 0); // Raw mode
36
37 for (;;) {
38 printf("\e[%u;%uH%c", y+1, x+1, c);
39 t[1&++tick] = time(0);
40 if (t[0] != t[1]) terminal_probesize(&width, &height);
41 // Don't block first time through, to force header print
42 key = scan_key_getsize(scratch, -1*!!t[0], &width, &height);
43 printf("\e[HESC to exit: ");
44 // Print unknown escape sequence
45 if (*scratch) {
46 printf("key=[ESC");
47 // Fetch rest of sequence after deviation, time gap determines end
48 while (0<(key = scan_key_getsize(scratch, 0, &width, &height)))
49 printf("%c", key);
50 printf("] ");
51 } else printf("key=%d ", key);
52 printf("x=%d y=%d width=%d height=%d\e[K", x, y, width, height);
53 fflush(0);
54
55 if (key == -2) continue;
56 if (key <= ' ') break;
57 if (key>=256) {
58 printf("\e[%u;%uH ", y+1, x+1);
59
60 key -= 256;
61 if (key==KEY_UP) y--;
62 else if (key==KEY_DOWN) y++;
63 else if (key==KEY_RIGHT) x++;
64 else if (key==KEY_LEFT) x--;
65 else if (key==KEY_PGUP) y = 0;
66 else if (key==KEY_PGDN) y = 999;
67 else if (key==KEY_HOME) x = 0;
68 else if (key==KEY_END) x = 999;
69 if (y<1) y = 1;
70 if (y>=height) y = height-1;
71 if (x<0) x = 0;
72 if (x>=width) x = width-1;
73 } else c = key;
74 }
75 tty_reset();
76 }
77