Class: Dispel::Screen

Inherits:
Object
  • Object
show all
Defined in:
lib/dispel/screen.rb

Constant Summary collapse

COLOR_SOURCE_VALUES = 
256
COLOR_TARGET_VALUES = 
5
COLOR_DIVIDE = 
COLOR_SOURCE_VALUES / COLOR_TARGET_VALUES
TERM_COLOR_BASE = 
16

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Screen

Returns a new instance of Screen.



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# File 'lib/dispel/screen.rb', line 7

def initialize(options)
  @options = options
  @cache = []
end

Instance Attribute Details

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/dispel/screen.rb', line 5

def options
  @options
end

Class Method Details

.color_id(foreground, background) ⇒ Object

create a new color from foreground+background or reuse old and return color-id



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# File 'lib/dispel/screen.rb', line 137

def color_id(foreground, background)
  @color_ids ||= {}
  @color_ids[[foreground, background]] ||= begin
    # make a new pair with a unique id
    @@max_color_id ||= 0
    id = (@@max_color_id += 1)
    unless defined? RSpec # stops normal text-output, do not use in tests
      Curses::init_pair(id, foreground, background)
    end
    Curses.color_pair(id)
  end
end

.curses_style(style, colors, options = {}) ⇒ Object 



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# File 'lib/dispel/screen.rb', line 108

def curses_style(style, colors, options={})
  if colors
    foreground = options[:foreground] || '#ffffff'
    background = options[:background] || '#000000'

    foreground, background = if style == :normal
      [foreground, background]
    elsif style == :reverse
      ['#000000', '#ffffff']
    else
      # :red or [:red, :blue]
      f,b = style
      [f || foreground, b || background]
    end

    foreground = html_to_terminal_color(foreground)
    background = html_to_terminal_color(background)
    color_id(foreground, background)
  else # no colors
    if style == :reverse
      Curses::A_REVERSE
    else
      Curses::A_NORMAL
    end
  end
end

.html_to_terminal_color(html_color) ⇒ Object 



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# File 'lib/dispel/screen.rb', line 155

def html_to_terminal_color(html_color)
  return unless html_color
  r = (html_color[1..2].to_i(16) / COLOR_DIVIDE) * 36
  g = (html_color[3..4].to_i(16) / COLOR_DIVIDE) * 6
  b = (html_color[5..6].to_i(16) / COLOR_DIVIDE) * 1
  TERM_COLOR_BASE + r + g + b
end

.open(options = {}, &block) ⇒ Object 



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# File 'lib/dispel/screen.rb', line 12

def self.open(options={}, &block)
  new(options).open(&block)
end

Instance Method Details

#color? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dispel/screen.rb', line 50

def color?
  @options[:colors] and Curses.has_colors?
end

#columns ⇒ Object 



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# File 'lib/dispel/screen.rb', line 30

def columns
  Curses.stdscr.maxx
end

#debug_key(key) ⇒ Object 



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# File 'lib/dispel/screen.rb', line 44

def debug_key(key)
  @key_line ||= -1
  @key_line = (@key_line + 1) % lines
  write(@key_line, 0, "#{key.inspect}---")
end

#draw(view, style_map = [], cursor = [0,0]) ⇒ Object 



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# File 'lib/dispel/screen.rb', line 38

def draw(view, style_map=[], cursor=[0,0])
  @cache.clear if dimensions_changed?
  draw_view(view, style_map)
  Curses.setpos(*cursor) # cursor has to always be set or it ends in random position
end

#lines ⇒ Object 



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# File 'lib/dispel/screen.rb', line 34

def lines
  Curses.stdscr.maxy
end

#open(&block) ⇒ Object 



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# File 'lib/dispel/screen.rb', line 16

def open(&block)
  Curses.noecho # do not show typed chars
  Curses.nonl # turn off newline translation
  Curses.stdscr.keypad(true) # enable arrow keys
  Curses.raw # give us all other keys
  Curses.stdscr.nodelay = 1 # do not block -> we can use timeouts
  Curses.init_screen
  Curses.start_color if color?
  yield self
ensure
  Curses.clear # needed to clear the menu/status bar on windows
  Curses.close_screen
end