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! -------------------------------------------------------------------------
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! Menus.h A library extension providing easier and better menus
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! A menu is a tree of objects of class Option. A Menu is an Option which
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! launches a fresh menu when chosen. To choose option O, send the
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! So to start off a menu session, send this message to the top menu.
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! Here's a simple menu structure:
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! Menu "Instructions for playing Mordred";
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! Menu -> "How to play adventure games";
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! Option -> -> "Looking around"
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! with description "I am your eyes and ears ...";
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! Option -> -> "Taking and Dropping"
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! with description "When you find items ...";
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! Option -> "About the author"
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! with description "The author was born in ...";
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! Menus produced in this code are automatically divided into pages
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! so that they'll always fit on the screen, whatever size the screen is
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! and however many options there are.
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! Note that since objects can always be moved about in play, it's easy
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! to create new menu structures to fit the circumstances of the moment.
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! (For example, a hints menu which gives hints only on currently open
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! You can instead write a routine to receive the "description" message.
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! Then the text printed when an option is chosen can also vary.
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! If you return 2 from such a routine, then the game does not prompt
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! the player to press a key before going back into the menu.
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! If you return 3, then the whole menu is closed up immediately.
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! Finally, you can always give your own "select" routine for an Option.
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! The rules for return values are the same; what's different is that
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! this way the screen will not be cleared and given a nice banner when
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! the option is chosen. (Nothing visible will happen unless you do
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! it yourself.) The SwitchOption class is an example of the kind of
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! gadget you might want this for:
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! Menu "Game settings";
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! SwitchOption -> FullRoomD "full room descriptions" has on;
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! SwitchOption -> WordyP "wordier prompts";
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! SwitchOption -> AllowSavedG "allow saved games" has on;
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! Choosing any of these switch-options flips them between on and off.
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! In your program, you can test
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! if (WordyP has on) ...
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! and so forth to check the current state.
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! -------------------------------------------------------------------------
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! Then we are using library 6/1 or 6/2, which won't have defined these:
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Constant NKEY__TX = " N = next option";
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Constant PKEY__TX = "P = previous";
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Constant QKEY1__TX = " Q = resume game";
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Constant QKEY2__TX = "Q = previous menu";
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Constant RKEY__TX = "RETURN = select option";
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Constant NKEY1__KY = 'N';
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Constant NKEY2__KY = 'n';
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Constant PKEY1__KY = 'P';
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Constant PKEY2__KY = 'p';
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Constant QKEY1__KY = 'Q';
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Constant QKEY2__KY = 'q';
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Array ForUseByOptions string 128;
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[ bar_height page pages temp;
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@split_window bar_height;
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! Black out top line in reverse video:
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style reverse; spaces(screen_width);
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if (standard_interpreter == 0)
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{ ForUseByOptions-->0 = 128;
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@output_stream 3 ForUseByOptions;
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if (pages ~= 1) print " [", page, "/", pages, "]";
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temp = (screen_width - ForUseByOptions-->0)/2;
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if (pages ~= 1) print " [", page, "/", pages, "]";
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return ForUseByOptions-->0;
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[; self.emblazon(1, 1, 1);
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@set_window 0; font on; style roman; new_line; new_line;
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if (self provides description)
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return self.description();
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"[No text written for this option.]^";
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Class Menu class Option
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[ count j obj pkey line oldline top_line bottom_line
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page pages options top_option;
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screen_width = 0->33;
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screen_height = 0->32;
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if (screen_height == 0 or 255) screen_height = 18;
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screen_height = screen_height - 7;
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objectloop (obj in self && obj ofclass Option) options++;
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if (options == 0) return 2;
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pages = 1 + options/screen_height;
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top_option = (page - 1) * screen_height;
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self.emblazon(7 + count, page, pages);
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@set_cursor 2 1; spaces(screen_width);
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@set_cursor 2 2; print (string) NKEY__TX;
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j = screen_width-12; @set_cursor 2 j; print (string) PKEY__TX;
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@set_cursor 3 1; spaces(screen_width);
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@set_cursor 3 2; print (string) RKEY__TX;
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j = screen_width-17; @set_cursor 3 j;
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if (sender ofclass Option)
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print (string) QKEY2__TX;
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print (string) QKEY1__TX;
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count = top_line; j = 0;
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objectloop (obj in self && obj ofclass Option)
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{ if (j >= top_option && j < (top_option + screen_height))
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{ @set_cursor count 6;
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bottom_line = count - 1;
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{ ! Move or create the > cursor:
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{ if (oldline~=0) { @set_cursor oldline 4; print " "; }
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@set_cursor line 4; print ">";
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@read_char 1 -> pkey;
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if (pkey == NKEY1__KY or NKEY2__KY or 130)
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if (line > bottom_line)
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{ if (page == pages) page = 1; else page++;
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if (pkey == PKEY1__KY or PKEY2__KY or 129)
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{ line = bottom_line;
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+ (options % screen_height) - 1;
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{ page--; line = top_line + screen_height - 1;
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if (pkey==QKEY1__KY or QKEY2__KY or 27 or 131) break;
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if (pkey==10 or 13 or 132)
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objectloop (obj in self && obj ofclass Option)
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{ if (count == top_option + line - top_line) break;
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print "[Please press SPACE to continue.]^";
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L__M(##Miscellany, 53);
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@read_char 1 -> pkey;
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if (sender ofclass Option) return 2;
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font on; @set_cursor 1 1;
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@erase_window $ffff; @set_window 0;
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new_line; new_line; new_line;
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if (deadflag==0) <<Look>>;
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Class SwitchOption class Option
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[; print (object) self, " ";
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if (self has on) print "(on)"; else print "(off)";
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[; if (self has on) give self ~on; else give self on;
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! ------------------------------------------------------------------------
added
removed
include/newmenus.h
