Class: Ruco::TextArea

Inherits:
Object show all
Defined in:
lib/ruco/text_area.rb

Direct Known Subclasses

TextField

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(content, options) ⇒ TextArea

Returns a new instance of TextArea.



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# File 'lib/ruco/text_area.rb', line 5

def initialize(content, options)
  @lines = tabs_to_spaces(content).naive_split("\n")
  @options = options
  @line = 0
  @column = 0
  @cursor_line = 0
  @cursor_column = 0
  @scrolled_lines = 0
  @scrolled_columns = 0
  @options[:line_scrolling_offset] ||= @options[:lines] / 2
  @options[:column_scrolling_offset] ||= @options[:columns] / 2
end

Instance Attribute Details

#lines ⇒ Object (readonly)

Returns the value of attribute lines.



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# File 'lib/ruco/text_area.rb', line 3

def lines
  @lines
end

Instance Method Details

#content ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 94

def content
  (lines * "\n").freeze
end

#cursor ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 79

def cursor
  Cursor.new @cursor_line, @cursor_column
end

#cursor_index ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 83

def cursor_index
  index = lines[0...@line].join("\n").size + @column
  index += 1 if @line > 0 # account for missing newline
  index
end

#delete(count) ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 60

def delete(count)
  if count > 0
    if current_line[@column..-1].size >= count
      current_line.slice!(@column, count)
    else
      with_lines_as_string do |content|
        content.slice!(cursor_index, count)
      end
    end
  else
    backspace(count.abs)
  end
end

#delete_line ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 74

def delete_line
  lines.slice!(@line, 1)
  adjust_view
end

#insert(text) ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 49

def insert(text)
  text = tabs_to_spaces(text)
  if text == "\n" and @column >= after_last_word
    current_whitespace = current_line.match(/^\s*/)[0]
    next_whitespace = lines[@line+1].to_s.match(/^\s*/)[0]
    text = text + [current_whitespace, next_whitespace].max
  end
  insert_into_content text
  move_according_to_insert text
end

#move(where, *args) ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 24

def move(where, *args)
  case where
  when :relative then
    @line += args.first
    @column += args.last
  when :to then
    @line, @column = args
  when :to_bol then move_to_bol(*args)
  when :to_eol then move_to_eol(*args)
  when :to_line then @line = args.first
  when :to_column then @column = args.first
  when :page_down then
    shift = @options[:lines] - 1
    @line += shift
    @scrolled_lines += shift
  when :page_up then
    shift = @options[:lines] - 1
    @line -= shift
    @scrolled_lines -= shift
  else
    raise "Unknown move type #{where} with #{args.inspect}"
  end
  adjust_view
end

#position_for_index(index) ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 89

def position_for_index(index)
  jump = content.slice(0, index).to_s.naive_split("\n")
  [jump.size - 1, jump.last.size]
end

#resize(lines, columns) ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 98

def resize(lines, columns)
  @options[:lines] = lines
  @options[:columns] = columns
end

#view ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 18

def view
  Array.new(@options[:lines]).map_with_index do |_,i|
    (lines[i + @scrolled_lines] || "").slice(@scrolled_columns, @options[:columns])
  end * "\n" + "\n"
end