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To illustrate a key virtualization routine, consider ``Sample routine that translates keys into menu requests'', which shows the key virtualization routine get_request. Nearly all the values it returns are the ETI menu requests to be discussed in the sections below.
/* define application commands */#define QUIT (MAX_COMMAND + 1)
/* Note that ^X represents the character control-X.
^Q - end menu processing
^N - move to next item ^P - move to previous item home key - move to first item home down - move to last item
left arrow - move left to item right arrow - move right to item down arrow - move down to item up arrow - move up to item
^U - scroll up a line ^D - scroll down a line ^B - scroll up a page ^F - scroll down a page
^X - clear pattern buffer ^H <BS> - delete character from pattern buffer ^A - request next pattern match ^Z - request previous pattern match
^T - toggle item */
static int get_request (w) /* virtual key mapping */ WINDOW * w; { int c = wgetch (w); /* read a character */
switch (c) { case 0x11: /* ^Q */ return QUIT;
case 0x0e: /* ^N */ return REQ_NEXT_ITEM; case 0x10: /* ^P */ return REQ_PREV_ITEM; case KEY_HOME: return REQ_FIRST_ITEM; case KEY_LL: return REQ_LAST_ITEM;
case KEY_LEFT: return REQ_LEFT_ITEM; case KEY_RIGHT: return REQ_RIGHT_ITEM; case KEY_UP: return REQ_UP_ITEM; case KEY_DOWN: return REQ_DOWN_ITEM;
case 0x15: /* ^U */ return REQ_SCR_ULINE; case 0x04: /* ^D */ return REQ_SCR_DLINE; case 0x06: /* ^F */ return REQ_SCR_DPAGE; case 0x02: /* ^B */ return REQ_SCR_UPAGE;
case 0x18: /* ^X */ return REQ_CLEAR_PATTERN; case 0x08: /* ^H */ return REQ_BACK_PATTERN; case 0x01: /* ^A */ return REQ_NEXT_MATCH; case 0x1a: /* ^Z */ return REQ_PREV_MATCH;
case 0x14: /* ^T */ return REQ_TOGGLE_ITEM; } return c; }
Sample routine that translates keys into menu requests
Note that because wgetch here automatically does a refresh before reading a character, you can omit explicit calls to wrefresh in applications that do character input.