Class: Device::IO

Inherits:
IO
  • Object
show all
Includes:
Helper
Defined in:
lib/device/io.rb

Constant Summary collapse

F1 = 
"\001"
F2 = 
"\002"
F3 = 
"\003"
F4 = 
"\004"
FUNC = 
"\006"
UP = 
"\007"
DOWN = 
"\008"

"\009"
ENTER = 
0x0D.chr
CLEAR = 
0x0F.chr
ALPHA = 
0x10.chr
SHARP = 
0x11.chr
KEY_TIMEOUT = 
0x12.chr
BACK = 
"\017"
CANCEL = 
0x1B.chr
IO_INPUT_NUMBERS = 
:numbers
IO_INPUT_LETTERS = 
:letters
IO_INPUT_SECRET = 
:secret
IO_INPUT_DECIMAL = 
:decimal
IO_INPUT_MONEY = 
:money
NUMBERS = 
%w(1 2 3 4 5 6 7 8 9 0)

Class Method Summary collapse

Methods included from Helper

#attach, #check_download_error, #form, #ljust, #menu, #number_to_currency, #rjust

Class Method Details

.get_format(min, max, options = {}) ⇒ String

Restricted to terminals, get strings and numbers. The switch method between uppercase, lowercase and number characters is to keep pressing a same button quickly. The timeout of this operation is 1 second.

:precision - Sets the level of precision (defaults to 2).

:separator - Sets the separator between the units (defaults to “.”).

:delimiter - Sets the thousands delimiter (defaults to “,”).

:label - Sets the label display before currency, eg.: “U$:”, “R$:”

:mode - Define input modes:

:numbers (IO_INPUT_NUMBERS) - Only number.
:letters (IO_INPUT_LETTERS) - Letters and numbers.
:secret (IO_INPUT_SECRET) - Secret *.
:decimal (IO_INPUT_DECIMAL) - Decimal input, only number.
:money (IO_INPUT_MONEY) - Money input, only number.

Parameters:

  • min (Fixnum) —

    Minimum length of the input string.

  • max (Fixnum) —

    Maximum length of the input string (127 bytes maximum).

  • options (Hash) (defaults to: {})

Returns:

  • (String) —

    buffer read from keyboard



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# File 'lib/device/io.rb', line 52

def self.get_format(min, max, options = {})
  options[:mode] ||= IO_INPUT_LETTERS
  if options[:mode] == IO_INPUT_MONEY || options[:mode] == IO_INPUT_DECIMAL

    text = ""
    key = ""

    while key != CANCEL
      Device::Display.clear 2
      Device::Display.print_line number_to_currency(text, options), 2, 0
      key = getc
      if key == BACK
        text = text[0..-2]
      elsif text.size >= max
        next
      elsif NUMBERS.include? key
        text << key
      elsif key == ENTER
        return text
      end
    end
  else
    get_string(min, max, options[:mode])
  end
end

.getc(timeout = 0) ⇒ String

Read 1 byte on keyboard, wait until be pressed

Parameters:

  • timeout (Fixnum) (defaults to: 0) —

    Timeout in milliseconds to wait for key.

Returns:

  • (String) —

    key read from keyboard



83
 
# File 'lib/device/io.rb', line 83

def self.getc(timeout = 0); super(timeout); end