Handle screen size changes while calling getch about curses HOT 3 CLOSED

I ported the code from William Morgan's 2009 blog post. The following code proves that yes, getch is blocking.

require 'curses'
require 'thread'

Thread.new do
  sleep 0.1
  Curses.stdscr.setpos(0, 0)
  Curses.stdscr.addstr('library is GOOD')
end



Curses.init_screen
Curses.raw
Curses.clear
Curses.curs_set(0)
Curses.noecho
Curses.cbreak
Curses.start_color

Curses.stdscr.setpos(0, 0)
Curses.stdscr.addstr('library is BAD')
Curses.stdscr.getch


Curses.close_screen

from curses.

@mcormier You need to refresh the screen as follows:

Thread.new do
  sleep 0.1
  Curses.stdscr.setpos(0, 0)
  Curses.stdscr.addstr('library is GOOD')
  Curses.stdscr.refresh
end

You don't need to handle SIGWINCH on you own because getch returns
Curses::KEY_RESIZE when SIGWINCH is detected.

from curses.

@mcormier

def size_changed
  # TODO -- notify all size changed listeners
  @listeners.each { |listener|
    #listener.screen_size_changed
 }
end


begin
  Signal.trap('SIGWINCH', size_changed )

The code doesn't work because size_changed is called at the time when Signal.trap is called,
not when the signal is received.

Try the following code:

def size_changed(sig)
  # TODO -- notify all size changed listeners
  @listeners.each { |listener|
    #listener.screen_size_changed
  }
end


begin
  Signal.trap('SIGWINCH', method(:size_changed))

Or more simply:

begin
  Signal.trap('SIGWINCH') do
    ...
  end

from curses.