Class: Liberator::View

Inherits:
Object
  • Object
show all
Defined in:
lib/liberator/view.rb

Constant Summary collapse

GIGABYTE = 
1073741824
MEGABYTE = 
1048576
KILOBYTE = 
1024

Instance Method Summary collapse

Constructor Details

#initialize ⇒ View

Returns a new instance of View.



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# File 'lib/liberator/view.rb', line 7

def initialize
  # Initialize curses view.
  Curses.init_screen
  Curses.noecho
  Curses.curs_set 0
  Curses.cbreak
  @height = Curses.stdscr.maxy
  @width = Curses.stdscr.maxx

  @entry_window = Curses::Window.new @height-1, @width, 0, 0

  @status_bar = Curses::Window.new 1, @width, @height-1, 0
  @status_bar.standout

  @scroll_offset = 0
end

Instance Method Details

#capture_keystroke ⇒ Object 



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# File 'lib/liberator/view.rb', line 80

def capture_keystroke
  @entry_window.getch
end

#close ⇒ Object 



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# File 'lib/liberator/view.rb', line 89

def close
  # Clean up curses view.
  Curses.close_screen
end

#confirm_delete ⇒ Object 



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# File 'lib/liberator/view.rb', line 84

def confirm_delete
  update_status_bar "Really delete? (y to confirm)"
  capture_keystroke == 'y'
end

#formatted_size(size) ⇒ Object 



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# File 'lib/liberator/view.rb', line 66

def formatted_size(size)
  return '-' if size.nil?

  if size > GIGABYTE
    "#{size / GIGABYTE} GB"
  elsif size > MEGABYTE
    "#{size / MEGABYTE} MB"
  elsif size > KILOBYTE
    "#{size / KILOBYTE} KB"
  else
    "#{size} bytes"
  end
end

#refresh(directory, entries, selected_index) ⇒ Object 



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# File 'lib/liberator/view.rb', line 24

def refresh(directory, entries, selected_index)
  height = @entry_window.maxy

  # Clear the screen manually, since clear function causes blinking.
  @entry_window.setpos 0, 0
  height.times { @entry_window.deleteln }

  # Figure out what to draw based on the selected entry and height of the window.
  if selected_index < height-1
    visible_range = (0...height)
  elsif selected_index == entries.size-1 # last item selected
    visible_range = (entries.size-height..entries.size)
  else
    visible_range = (selected_index-height+2..selected_index+1)
  end

  entries[visible_range].each_with_index do |entry, index|
    # Turn on highlighting, if this entry is selected.
    @entry_window.standout if index+visible_range.begin == selected_index

    # Get the file/directory name, without its full path.
    name = entry[:path][entry[:path].rindex('/')+1..-1]
    name += '/' if File.directory? entry[:path]

    # Add the row to the window, appending a right-justified human-readable size.
    @entry_window << name + formatted_size(entry[:size]).rjust(@entry_window.maxx - name.length)

    # Stop highlighting.
    @entry_window.standend
  end

  update_status_bar directory
end

#update_status_bar(content) ⇒ Object 



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# File 'lib/liberator/view.rb', line 58

def update_status_bar(content)
  @status_bar.setpos 0, 0
  formatted_content = content.ljust @width
  @status_bar << formatted_content

  @status_bar.refresh
end