Module: Potty::Border

Defined in:
lib/potty/border.rb

Overview

Box-drawing helper shared by any widget that needs a frame (List, Panel, Modal, etc.) instead of each one hand-rolling corner glyphs.

Constant Summary collapse

STYLES = 
{
  single:  { tl: "\u250C", tr: "\u2510", bl: "\u2514", br: "\u2518", h: "\u2500", v: "\u2502" },
  rounded: { tl: "\u256D", tr: "\u256E", bl: "\u2570", br: "\u256F", h: "\u2500", v: "\u2502" },
  double:  { tl: "\u2554", tr: "\u2557", bl: "\u255A", br: "\u255D", h: "\u2550", v: "\u2551" },
  heavy:   { tl: "\u250F", tr: "\u2513", bl: "\u2517", br: "\u251B", h: "\u2501", v: "\u2503" }
}.freeze

Class Method Summary collapse

Class Method Details

.draw(window, rect, style: :single, attr: 0, title: nil) ⇒ Object

Draw a border around rect on window. ‘attr` is a resolved curses attribute (e.g. theme); `title`, if given, is centered on the top edge.



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# File 'lib/potty/border.rb', line 19

def draw(window, rect, style: :single, attr: 0, title: nil)
  return if rect.width < 2 || rect.height < 2

  s = STYLES[style] || STYLES[:single]
  inner = rect.width - 2

  window.attron(attr) do
    window.setpos(rect.y, rect.x)
    window.addstr(s[:tl] + s[:h] * inner + s[:tr])

    (1...(rect.height - 1)).each do |dy|
      window.setpos(rect.y + dy, rect.x)
      window.addstr(s[:v])
      window.setpos(rect.y + dy, rect.x + rect.width - 1)
      window.addstr(s[:v])
    end

    window.setpos(rect.y + rect.height - 1, rect.x)
    window.addstr(s[:bl] + s[:h] * inner + s[:br])
  end

  draw_title(window, rect, title, attr, inner) if title && !title.to_s.empty?
end

.draw_title(window, rect, title, attr, inner) ⇒ Object 



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# File 'lib/potty/border.rb', line 43

def draw_title(window, rect, title, attr, inner)
  label = " #{title} "
  label = label[0, inner] || '' if label.length > inner
  x = rect.x + 1 + [(inner - label.length) / 2, 0].max
  window.setpos(rect.y, x)
  window.attron(attr) { window.addstr(label) }
end