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- /* EX_CHAT.C - Example of a multi-window full-screen chat door written with
- * OpenDoors. Demonstrates the ease of using sophisticated ANSI /
- * AVATAR terminal features within OpenDoors programs. See manual
- * for instructions on how to compile this program or any other
- * OpenDoors program.
- *
- * This program create two windows on the screen, seperated by
- * a bar with user name / sysop name information. This program
- * permits communication between the local sysop and remote user
- * by displaying the text typed by the user in one window, and
- * the text typed by the sysop in the other window. When either
- * user reaches the bottom of the window, the contents of the
- * window is scrolled up to provide more room for typing. Words
- * are also wrapped when either typist reaches the end of a
- * line. The advantage of a split-screen chat program is that
- * it permits both sysop and user to type at the same time
- * without difficulty. The chat function automatically invokes
- * OpenDoor's internal chat mode if ANSI or AVATAR modes are not
- * available. The display colours, window sizes and locations,
- * and distance to scroll a window's contents are configurable
- * by setting the appropriate variables, below. When the Sysop
- * invokes a DOS shell, a pop-up window is displayed to indicate
- * to the user that the door program has been suspended.
- */
-
- #include "opendoor.h" /* Include required header files */
- #include <string.h>
-
-
- void fullscreen_chat(void); /* Full-screen chat function prototypes */
- void chat_new_line(void);
- void display_shell_window(void);
- void remove_shell_window(void);
-
-
-
- main() /* PROGRAM'S EXECUTION BEGINS HERE */
- {
- od_init(); /* Initialize OpenDoors */
-
- fullscreen_chat(); /* Invoke full-screen chat function */
-
- return(0); /* Exit door */
- }
-
-
-
-
-
- /* FULL-SCREEN CHAT CUSTOMIZATION OPTIONS */
-
- char window_colour[2]={0x0b,0x0c}; /* Text colour used for each person */
- char bar_colour=0x70; /* Colour of window seperation bar */
- char top_line[2]={1,13}; /* Specifies location of each window on screen */
- char bottom_line[2]={11,23}; /* Line number of bottom of each window */
- char bar_line=12; /* Line number of window seperation bar */
- char scroll_distance=2; /* Distance to scroll window when required */
- char shell_window_title=0x1a; /* Colour of title of DOS shell notice window */
- char shell_window_boarder=0x1f; /* Colour of DOS shell window boarder */
- char shell_window_text=0x1b; /* Colour of text in DOS shell window */
-
-
-
- char cursor_window; /* FULL-SCREEN CHAT INTERNAL VARIABLES */
- char current_word[2][81];
- int word_length[2];
- int cursor_col[2];
- int cursor_line[2];
- unsigned char key;
- int old_chat_key;
- void *shell_window;
- char *before_shell_text;
- char *after_shell_text;
- /* FULL-SCREEN CHAT FUNCTION */
- void fullscreen_chat(void)
- {
- cursor_window=0; /* Reset working variables */
- word_length[0]=word_length[1]=0;
- cursor_col[0]=cursor_col[1]=1;
- cursor_line[0]=top_line[0];
- cursor_line[1]=top_line[1];
-
-
- /* If ANSI or AVATAR graphics mode is not available */
- if(!od_control.user_ansi && !od_control.user_avatar)
- {
- od_chat(); /* Then use OpenDoor's line chat mode instead */
- return;
- }
-
- od_control.od_cbefore_shell=display_shell_window;/* Set DOS shell settings */
- od_control.od_cafter_shell=remove_shell_window;
- before_shell_text=od_control.od_before_shell;
- after_shell_text=od_control.od_after_shell;
- od_control.od_before_shell=NULL;
- od_control.od_after_shell=NULL;
-
- old_chat_key=od_control.key_chat; /* Prevent internal chat mode from */
- od_control.key_chat=0; /* being invoked */
-
- /* DRAW THE CHAT SCREEN */
- od_set_attrib(window_colour[0]);
- od_clr_scr(); /* Clear the screen */
-
- od_set_cursor(bar_line,1); /* Draw window seperation bar */
- od_set_attrib(bar_colour);
- od_clr_line();
- od_printf(" Top : %s Bottom : %s",od_control.user_name,
- od_control.sysop_name);
-
- od_set_cursor(top_line[0],1); /* Locate cursor where typing will begin */
- od_set_attrib(window_colour[0]); /* Set appropriate text colour */
-
- /* MAIN CHAT LOOP */
- for(;;) /* (Repeats for each character typed) */
- {
- key=(char)od_get_key(TRUE); /* Get next keystroke from keyboard */
-
-
- /* CHECK FOR SYSOP ABORT */
- if(key==27 && od_control.od_last_input==1) /* If sysop pressed [ESC] */
- {
- od_set_attrib(0x07); /* Reset display colour */
- od_clr_scr(); /* Clear the screen */
- od_control.key_chat=old_chat_key; /* Re-enable internal chat mode */
-
- od_control.od_cbefore_shell=NULL; /* Restore DOS shell settings */
- od_control.od_cafter_shell=NULL;
- od_control.od_before_shell=before_shell_text;
- od_control.od_after_shell=after_shell_text;
-
- return; /* Exit full-screen chat */
- }
-
- /* CHECK FOR NEW TYPIST */
- if(od_control.od_last_input!=cursor_window) /* If new person typing now */
- { /* Switch cursor to appropriate window */
- cursor_window=od_control.od_last_input; /* Set current typist */
-
- /* Move cursor to new window */
- od_set_cursor(cursor_line[cursor_window],cursor_col[cursor_window]);
-
- od_set_attrib(window_colour[cursor_window]); /* Change text colour */
- }
-
-
- if(key==13 || key==10) /* IF USER PRESSED [ENTER] / [RETURN] */
- {
- word_length[cursor_window]=0; /* Enter constitutes end of word */
-
- chat_new_line(); /* Move to next line */
- }
-
-
- else if(key==8) /* IF USER PRESS [BACKSPACE] */
- {
- if(cursor_col[cursor_window] > 1) /* If not at left of screen */
- {
- --cursor_col[cursor_window]; /* Move cursor back on character */
- if(word_length[cursor_window] > 0) --word_length[cursor_window];
- od_printf("\b \b"); /* Erase last character from screen */
- }
- }
-
-
- else if(key==32) /* IF USER PRESSED [SPACE] */
- {
- word_length[cursor_window]=0; /* [Space] constitutes end of word */
-
- if(cursor_col[cursor_window]==79) /* If at end of line */
- chat_new_line(); /* Move cursor to next line */
- else /* If not at end of line */
- {
- ++cursor_col[cursor_window]; /* Increment cursor position */
- od_putch(32); /* Display a space */
- }
- }
-
-
- else if(key>32) /* IF USER TYPED A PRINTABLE CHARACTER */
- { /* PERFORM WORD WRAP IF NECESSARY */
- if(cursor_col[cursor_window]==79) /* If cursor is at end of line */
- {
- /* If there is a word to wrap */
- if(word_length[cursor_window]>0 && word_length[cursor_window]<78)
- {
- /* Move cursor to beginning of word */
- od_set_cursor(cursor_line[cursor_window],
- cursor_col[cursor_window]-word_length[cursor_window]);
-
- od_clr_line(); /* Erase word from current line */
-
- chat_new_line(); /* Move cursor to next line */
-
- /* Redisplay word */
- od_disp(current_word[cursor_window],word_length[cursor_window],
- TRUE);
- cursor_col[cursor_window]+=word_length[cursor_window];
- }
-
- else /* If there is no word to "wrap" */
- {
- chat_new_line(); /* Move cursor to next line */
- word_length[cursor_window]=0; /* Start a new word */
- }
- }
-
- /* ADD CHARACTER TO CURRENT WORD */
- /* If there is room for more character in word */
- if(strlen(current_word[cursor_window])<79) /* Add new character */
- current_word[cursor_window][word_length[cursor_window]++]=key;
-
- /* DISPLAY NEWLY TYPED CHARACTER */
- ++cursor_col[cursor_window];
- od_putch(key);
- }
- }
- }
-
-
-
- /* FUNCTION USED BY FULL-SCREEN CHAT TO START A NEW INPUT LINE */
- void chat_new_line(void)
- { /* If cursor is at bottom of window */
- if(cursor_line[cursor_window]==bottom_line[cursor_window])
- { /* Scroll window up one line on screen */
- od_scroll(1,top_line[cursor_window],79, bottom_line[cursor_window],
- scroll_distance, 0);
- cursor_line[cursor_window]-=(scroll_distance - 1);
- }
-
- else /* If cursor is not at bottom of window */
- {
- ++cursor_line[cursor_window]; /* Move cursor down one line */
- }
-
- /* Move cursor's position on screen */
- od_set_cursor(cursor_line[cursor_window],cursor_col[cursor_window]=1);
-
- od_set_attrib(window_colour[cursor_window]); /* Change text colour */
- }
-
-
- void display_shell_window(void)
- {
- if((shell_window=od_window_create(17,9,63,15,"DOS Shell",
- shell_window_boarder, shell_window_title,
- shell_window_text, 0))==NULL) return;
-
- od_set_attrib(shell_window_text);
- od_set_cursor(11,26);
- od_printf("The Sysop has shelled to DOS");
- od_set_cursor(13,21);
- od_printf("He/She will return in a few moments...");
- }
-
-
- void remove_shell_window(void)
- {
- od_window_remove(shell_window);
- od_set_cursor(cursor_line[cursor_window],cursor_col[cursor_window]);
- od_set_attrib(window_colour[cursor_window]);
- }
-