Class: Ruco::TextArea

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

Direct Known Subclasses

EditorArea, 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 = content.naive_split("\n")
  @options = options.dup
  @column = 0
  @line = 0
  @window = Window.new(@options.delete(:lines), @options.delete(:columns), @options[:window]||{})
  adjust_window
end

Instance Attribute Details

#column ⇒ Object

Returns the value of attribute column.



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

def column
  @column
end

#line ⇒ Object

Returns the value of attribute line.



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

def line
  @line
end

#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

#selection ⇒ Object (readonly)

Returns the value of attribute selection.



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

def selection
  @selection
end

Instance Method Details

#content ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 117

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

#cursor ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 19

def cursor
  adjust_window
  @window.cursor
end

#delete(count) ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 92

def delete(count)
  if @selection
    delete_content_in_selection
    return
  end

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

#index_for_position(position = self.position) ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 111

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

#insert(text) ⇒ Object 



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

def insert(text)
  delete_content_in_selection if @selection

  text.tabs_to_spaces!
  if text == "\n" and @column >= current_line.leading_whitespace.size
    current_whitespace = current_line.leading_whitespace
    next_whitespace = lines[line+1].to_s.leading_whitespace
    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 29

def move(where, *args)
  case where
  when :relative then
    self.line += args.first
    self.column += args.last
  when :to then
    self.line, self.column = args
  when :to_bol then move_to_bol(*args)
  when :to_eol then move_to_eol(*args)
  when :to_line then self.line = args.first
  when :to_column then self.column = args.first
  when :to_index then move(:to, *position_for_index(*args))
  when :page_down then
    self.line += @window.lines
    @window.set_top(@window.top + @window.lines, @lines.size)
  when :page_up then
    self.line -= @window.lines
    @window.set_top(@window.top - @window.lines, @lines.size)
  else
    raise "Unknown move type #{where} with #{args.inspect}"
  end
  @selection = nil unless @selecting
end

#position ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 126

def position
  Position.new(line, column)
end

#reset ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 75

def reset
  @selection = nil
end

#resize(lines, columns) ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 121

def resize(lines, columns)
  @window.lines = lines
  @window.columns = columns
end

#selecting(&block) ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 53

def selecting(&block)
  start = if @selection
    (position == @selection.first ? @selection.last : @selection.first)
  else
    position
  end

  @selecting = true
  instance_exec(&block)
  @selecting = false

  sorted = [start, position].sort
  @selection = sorted[0]..sorted[1]
end

#style_map ⇒ Object 



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

def style_map
  adjust_window
  @window.style_map(@selection)
end

#text_in_selection ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 68

def text_in_selection
  return '' unless @selection
  start = index_for_position(@selection.first)
  finish = index_for_position(@selection.last)
  content.slice(start, finish-start)
end

#view ⇒ Object 



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# File 'lib/ruco/text_area.rb', line 14

def view
  adjust_window
  @window.crop(lines) * "\n"
end