def draw_screen(self, (cols, rows), r ):
        
        if cols != self.last_screen_width:
            self.last_screen = {}
    
        sendq = [self.content_head]
        
        if self.update_method == "polling":
            send = sendq.append
        elif self.update_method == "polling child":
            signal.alarm( 0 )
            try:
                s, addr = self.server_socket.accept()
            except socket.timeout:
                sys.exit(0)
            send = s.sendall
        else:
            signal.alarm( 0 )
            send = sendq.append
            send("\r\n")
            self.content_head = ""
        
        assert r.rows() == rows
    
        if r.cursor is not None:
            cx, cy = r.cursor
        else:
            cx = cy = None
        
        new_screen = {}
        
        y = -1
        for row in r.content():
            y += 1
            row = list(row)
            
            l = []
            
            sig = tuple(row)
            if y == cy: sig = sig + (cx,)
            new_screen[sig] = new_screen.get(sig,[]) + [y]
            old_line_numbers = self.last_screen.get(sig, None)
            if old_line_numbers is not None:
                if y in old_line_numbers:
                    old_line = y
                else:
                    old_line = old_line_numbers[0]
                send( "<%d\n"%old_line )
                continue
            
            col = 0
            for (a, cs, run) in row:
                run = run.translate(_trans_table)
                if a is None:
                    fg,bg,mono = "black", "light gray", None
                else:
                    fg,bg,mono = self.palette[a]
                if y == cy and col <= cx:
                    run_width = util.calc_width(run, 0, 
                        len(run))
                    if col+run_width > cx:
                        l.append(code_span(run, fg, bg,
                            cx-col))
                    else:
                        l.append(code_span(run, fg, bg))
                    col += run_width
                else:
                    l.append(code_span(run, fg, bg))

            send("".join(l)+"\n")
        self.last_screen = new_screen
        self.last_screen_width = cols
        
        if self.update_method == "polling":
            sys.stdout.write("".join(sendq))
            sys.stdout.flush()
            sys.stdout.close()
            self._fork_child()
        elif self.update_method == "polling child":
            s.close()
        else: # update_method == "multipart"
            send("\r\n--ZZ\r\n")
            sys.stdout.write("".join(sendq))
            sys.stdout.flush()
        
        signal.alarm( ALARM_DELAY )
Send a screen update to the client.
dataset/ETHPy150Open AnyMesh/anyMesh-Python/example/urwid/web_display.py/Screen.draw_screen