From: Jim <aa204@...>
Date: 2003-01-31T19:17:31+09:00
Subject: Ncurses refresh problem

Hello,

I am porting to Ruby a small calendar browser I made using C and
ncurses. I can't seem to figure out why my newwin won't refresh until
after a key is pressed. After hours of reading ncurses man pages, I am
stumped. I've included the essential code below.

And feel free to comment/correct my brute-force approach towards a more
Ruby-ish style.

Thanks.


#!/usr/bin/env ruby

require "ncurses"

class Calendar

  attr_reader :month, :year, :day

  @@MONTHNAMES = [nil] + %w(January February March April
			    May June July August September
			    October November December)

  def initialize(time = Time.new(), y = 0, x = 0)
    @win    = Ncurses.newwin(9, 22, y, x)
    # @win = Ncurses.subwin(Ncurses.stdscr, 9, 22, 0, 0)
    @border = true
    @month  = time.month
    @day    = time.mday
    @year   = time.year
  end

  def leap_year?( year )
    ( year % 4 == 0 ) && (( year % 100 != 0 ) || (year % 400 == 0))
  end

  def days_in_month
    return 29 if @month == 2 && leap_year?( @year )
    return [31, 28, 31, 30,31, 30, 31, 31, 30, 31, 30, 31][@month - 1]
  end

  def draw
    @win.clear()
    @win.border( *([0]*8) ) if @border == true
    Ncurses.mvwprintw(@win, 0, 4, " %s %d ", @@MONTHNAMES[@month], @year)
    Ncurses.mvwprintw(@win, 1, 1, "Su Mo Tu We Th Fr Sa")
    first = Time.local(@year, @month, 1).wday + 1
    y = 2
    (1..days_in_month()).each { |day| 
      x = (day + first - 2) % 7
      y += 1 if (x == 0 && day != 1)
      x = x * 3 + 1
      Ncurses.mvwprintw(@win, y, x, "%2d", day)
    }
    @win.refresh
  end
end

if $0 == __FILE__
  begin
    Ncurses.initscr
    Ncurses.noecho
    Ncurses.curs_set(0) 

    cal = Calendar.new
    cal.draw
    while Ncurses.getch != ?q
      cal.draw
    end
  ensure 
    Ncurses.echo
    Ncurses.endwin
  end
end

--