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#! /usr/bin/perl ## use ExtUtils::testlib; use Curses; sub fatal { clrtobot(0, 0); addstr(0, 0, "@_\n"); refresh(); sleep 2; exit 1; } sub driveForm($$) { my ($fwin, $form) = @_; while (1) { my $ch = getch($fwin); if ($ch == KEY_UP) { form_driver($form, REQ_PREV_FIELD); } elsif ($ch == KEY_DOWN or $ch eq "\t" or $ch eq "\r" or $ch eq "\n") { form_driver($form, REQ_NEXT_FIELD); } elsif ($ch == KEY_LEFT) { form_driver($form, REQ_LEFT_CHAR); } elsif ($ch == KEY_RIGHT) { form_driver($form, REQ_RIGHT_CHAR); } elsif ($ch == KEY_NPAGE) { form_driver($form, REQ_NEXT_PAGE); } elsif ($ch == KEY_PPAGE) { form_driver($form, REQ_PREV_PAGE); } elsif ($ch == KEY_DC or ord($ch) == 8 or ord($ch) == 127) { form_driver($form, REQ_DEL_PREV); } elsif ($ch == KEY_F(1)) { last; } elsif ($ch =~ /^\S$/) { form_driver($form, ord($ch)); } else { beep(); } } } sub makeFields() { my $flist = [ [ 'L', 0, 0, 0, 8, "Form" ], [ 'L', 0, 0, 2, 0, "First Name" ], [ 'F', 1, 15, 2, 12, "F Name" ], [ 'L', 0, 0, 3, 0, "Last Name" ], [ 'F', 1, 15, 3, 12, "L Name" ], [ 'L', 0, 0, 5, 8, "Form (pt 2)" ], [ 'L', 0, 0, 7, 0, "# Tuits" ], [ 'F', 1, 5, 7, 12, "Tuits" ], [ 'L', 0, 0, 8, 0, "# Bleems" ], [ 'F', 1, 5, 8, 12, "Bleems" ] ]; my @fl; foreach my $F (@$flist) { my $field; # This is a Perl reference to a scalar number variable. The # number is the numerical equivalent (cast) of the C pointer to the # executable-Curses FIELD object. The reference is blessed into # package "Curses::Field", but don't confuse it with a Perl # object. if ($F->[0] eq 'L') { $field = new_field(1, length($F->[5]), $F->[3], $F->[4], 0, 0); if ($field eq '') { fatal("new_field $F->[5] failed"); } set_field_buffer($field, 0, $F->[5]); field_opts_off($field, O_ACTIVE); field_opts_off($field, O_EDIT); } elsif ($F->[0] eq 'F') { $field = new_field($F->[1], $F->[2], $F->[3], $F->[4], 0, 0); if ($field eq '') { fatal("new_field $F->[5] failed"); } if ($F->[5] eq "Tuits") { set_field_buffer($field, 0, $F->[5]); } set_field_back($field, A_UNDERLINE); } push(@fl, $field); } return @fl; } sub makeForm(@) { my @fl = @_; my @pack; foreach $fieldR (@fl) { push(@pack, $ {$fieldR}); } push(@pack, 0); # new_form()'s argument is a list of fields. Its form is amazingly # complex: # The argument is a string whose ASCII encoding is an array of C # pointers. Each pointer is to a FIELD object of the # executable-Curses library, except the last is NULL to mark the # end of the list. For example, assume there are two fields and # the executable-Curses library represents them with FIELD objects # whose addresses (pointers) are 0x11223344 and 0x0004080C. The # argument to Curses::new_form() is a 12 character string whose # ASCII encoding is 0x112233440004080C00000000 . # Maybe some day we can provide an alternative where there is an # actual Perl field object class and the argument is a reference to # a Perl list of them. my $form = new_form(pack('L!*', @pack)); if ($form eq '') { fatal("new_form failed"); } return $form; } sub demo() { noecho(); eval { new_form() }; if ($@ =~ m{not defined by your vendor}) { print STDERR "Curses was not compiled with form function.\n"; exit 1; } my @fl = makeFields(); my $form = makeForm(@fl); my $rows; my $cols; scale_form($form, $rows, $cols); my $fwin = newwin($rows + 2, $cols + 4, 4, 0); my $fsub = derwin($fwin, $rows, $cols, 1, 2); set_form_win($form, $fwin); set_form_sub($form, $fsub); box($fwin, 0, 0); keypad($fwin, 1); post_form($form); addstr(0, 0, "Use KEY_UP/KEY_DOWN/KEY_PPAGE/KEY_NPAGE to navigate"); addstr(1, 0, "Press 'ENTER' to select item, or 'F1' to exit"); addstr(2, 0, "Other alphanumeric characters will enter data"); refresh(); driveForm($fwin, $form); unpost_form($form); delwin($fwin); free_form($form); map { free_field($_) } @fl; } ############################################################################## # MAINLINE ############################################################################## initscr(); # The eval makes sure if it croaks, we have a chance to restore the # terminal. eval { demo() }; endwin(); if ($@) { print STDERR "Failed. $@\n"; exit(1); } exit(0);
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