Class: Ruco::Window

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

Constant Summary collapse

OFFSET = 
5

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(lines, columns, options = {}) ⇒ Window

Returns a new instance of Window.



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# File 'lib/ruco/window.rb', line 8

def initialize(lines, columns, options={})
  @options = options

  @options[:line_scroll_threshold] ||= 1
  @options[:line_scroll_offset] ||= 1
  @options[:column_scroll_threshold] ||= 1
  @options[:column_scroll_offset] ||= 5

  @lines = lines
  @columns = columns
  @top = 0
  @left = 0
  @cursor = Position.new(0,0)
end

Instance Attribute Details

#columns ⇒ Object

Returns the value of attribute columns.



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

def columns
  @columns
end

#cursor ⇒ Object (readonly)

Returns the value of attribute cursor.



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# File 'lib/ruco/window.rb', line 6

def cursor
  @cursor
end

#left ⇒ Object

Returns the value of attribute left.



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

def left
  @left
end

#lines ⇒ Object

Returns the value of attribute lines.



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

def lines
  @lines
end

#top ⇒ Object (readonly)

Returns the value of attribute top.



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# File 'lib/ruco/window.rb', line 6

def top
  @top
end

Instance Method Details

#crop(lines) ⇒ Object 



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# File 'lib/ruco/window.rb', line 33

def crop(lines)
  lines_to_display = lines[visible_lines] || []
  lines_to_display[@lines-1] ||= nil
  lines_to_display.map do |line|
    line ||= ''
    line[visible_columns] || ''
  end
end

#position=(x) ⇒ Object 



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# File 'lib/ruco/window.rb', line 23

def position=(x)
  set_position(x)
end

#scroll_column_into_view(column) ⇒ Object 



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# File 'lib/ruco/window.rb', line 47

def scroll_column_into_view(column)
  result = adjustment(column, visible_columns, @options[:column_scroll_threshold], @options[:column_scroll_offset])
  self.left = result if result
end

#scroll_line_into_view(line, total_lines) ⇒ Object 



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# File 'lib/ruco/window.rb', line 42

def scroll_line_into_view(line, total_lines)
  result = adjustment(line, visible_lines, @options[:line_scroll_threshold], @options[:line_scroll_offset])
  set_top result, total_lines if result
end

#set_position(position, options = {}) ⇒ Object 



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# File 'lib/ruco/window.rb', line 27

def set_position(position, options={})
  scroll_line_into_view position.line, (options[:max_lines] || 9999)
  scroll_column_into_view position.column
  @cursor = Position.new(position.line - @top, position.column - @left)
end

#set_top(line, total_lines) ⇒ Object 



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

def set_top(line, total_lines)
  max_top = total_lines - lines + 1 + @options[:line_scroll_offset]
  @top = [[line, max_top].min, 0].max
end

#style_map(selection) ⇒ Object 



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# File 'lib/ruco/window.rb', line 52

def style_map(selection)
  mask = StyleMap.new(lines)
  return mask unless selection

  lines.times do |line|
    visible = visible_area(line)
    next unless selection.overlap?(visible)

    first = [selection.first, visible.first].max
    first = first[1] - left
    last = [selection.last, visible.last].min
    last = last[1] - left

    mask.add(:reverse, line, first...last)
  end

  mask
end