Class: TTY2::Prompt::Slider

Inherits:
Object
  • Object
show all
Defined in:
lib/tty2/prompt/slider.rb

Overview

A class responsible for gathering numeric input from range

Constant Summary collapse

HELP = 
"(Use %s arrow keys, press Enter to select)"
FORMAT = 
":slider %s"

Instance Method Summary collapse

Constructor Details

#initialize(prompt, **options) ⇒ Slider

Initailize a Slider

Parameters:

  • prompt (Prompt) —

    the prompt

  • options (Hash) —

    the options to configure this slider

Options Hash (**options):

  • :min (Integer) —

    The minimum value

  • :max (Integer) —

    The maximum value

  • :step (Integer) —

    The step value

  • :format (String) —

    The display format



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# File 'lib/tty2/prompt/slider.rb', line 26

def initialize(prompt, **options)
  @prompt       = prompt
  @prefix       = options.fetch(:prefix) { @prompt.prefix }
  @choices      = Choices.new
  @min          = options.fetch(:min, 0)
  @max          = options.fetch(:max, 10)
  @step         = options.fetch(:step, 1)
  @default      = options[:default]
  @active_color = options.fetch(:active_color) { @prompt.active_color }
  @help_color   = options.fetch(:help_color) { @prompt.help_color }
  @format       = options.fetch(:format) { FORMAT }
  @quiet        = options.fetch(:quiet) { @prompt.quiet }
  @help         = options[:help]
  @show_help    = options.fetch(:show_help) { :start }
  @symbols      = @prompt.symbols.merge(options.fetch(:symbols, {}))
  @first_render = true
  @done         = false
end

Instance Method Details

#call(question, possibilities = nil, &block) ⇒ Object

Call the slider by passing question

Parameters:

  • question (String) —

    the question to ask



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# File 'lib/tty2/prompt/slider.rb', line 166

def call(question, possibilities = nil, &block)
  @question = question
  choices(possibilities) if possibilities
  block.call(self) if block
  # set up a Choices collection for min, max, step
  # if no possibilities were supplied
  choices((@min..@max).step(@step).to_a) if @choices.empty?

  @active = initial
  @prompt.subscribe(self) do
    render
  end
end

#choice(*value, &block) ⇒ Object

Add a single choice



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# File 'lib/tty2/prompt/slider.rb', line 126

def choice(*value, &block)
  if block
    @choices << (value << block)
  else
    @choices << value
  end
end

#choices(values = (not_set = true)) ⇒ Object

Add multiple choices

Parameters:

  • values (Array[Object]) (defaults to: (not_set = true)) —

    the values to add as choices



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# File 'lib/tty2/prompt/slider.rb', line 140

def choices(values = (not_set = true))
  if not_set
    @choices
  else
    values.each { |val| @choices << val }
  end
end

#default(value) ⇒ Object 



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# File 'lib/tty2/prompt/slider.rb', line 104

def default(value)
  @default = value
end

#default_help ⇒ Object

Default help text



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# File 'lib/tty2/prompt/slider.rb', line 78

def default_help
  arrows = @symbols[:arrow_left] + "/" + @symbols[:arrow_right]
  sprintf(HELP, arrows)
end

#format(value) ⇒ Object 



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# File 'lib/tty2/prompt/slider.rb', line 149

def format(value)
  @format = value
end

#help(text = (not_set = true)) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Set help text

Parameters:

  • text (String) (defaults to: (not_set = true)) 


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# File 'lib/tty2/prompt/slider.rb', line 88

def help(text = (not_set = true))
  return @help if !@help.nil? && not_set

  @help = (@help.nil? && not_set) ? default_help : text
end

#initial ⇒ Integer

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Setup initial active position

Returns:

  • (Integer) 


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# File 'lib/tty2/prompt/slider.rb', line 62

def initial
  if @default.nil?
    # no default - choose the middle option
    choices.size / 2
  elsif default_choice = choices.find_by(:name, @default)
    # found a Choice by name - use it
    choices.index(default_choice)
  else
    # default is the index number
    @default - 1
  end
end

#keyleft ⇒ Object Also known as: keydown 



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# File 'lib/tty2/prompt/slider.rb', line 180

def keyleft(*)
  @active -= 1 if @active > 0
end

#keyreturn ⇒ Object Also known as: keyspace, keyenter 



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# File 'lib/tty2/prompt/slider.rb', line 190

def keyreturn(*)
  @done = true
end

#keyright ⇒ Object Also known as: keyup 



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# File 'lib/tty2/prompt/slider.rb', line 185

def keyright(*)
  @active += 1 if (@active + 1) < choices.size
end

#max(value) ⇒ Object 



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# File 'lib/tty2/prompt/slider.rb', line 114

def max(value)
  @max = value
end

#min(value) ⇒ Object 



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# File 'lib/tty2/prompt/slider.rb', line 109

def min(value)
  @min = value
end

#quiet(value) ⇒ Object

Set quiet mode.



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# File 'lib/tty2/prompt/slider.rb', line 156

def quiet(value)
  @quiet = value
end

#show_help(value = (not_set = true)) ⇒ Object

Change when help is displayed



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# File 'lib/tty2/prompt/slider.rb', line 97

def show_help(value = (not_set = true))
  return @show_ehlp if not_set

  @show_help = value
end

#step(value) ⇒ Object 



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# File 'lib/tty2/prompt/slider.rb', line 119

def step(value)
  @step = value
end

#symbols(new_symbols = (not_set = true)) ⇒ Object

Change symbols used by this prompt

Parameters:

  • new_symbols (Hash) (defaults to: (not_set = true)) —

    the new symbols to use



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# File 'lib/tty2/prompt/slider.rb', line 51

def symbols(new_symbols = (not_set = true))
  return @symbols if not_set

  @symbols.merge!(new_symbols)
end