class BBS::Menubar::Dropdown

The box an open menu drops down in, under its label on the bar, shifted left when it would run off the right edge: its place, the items drawn in it and which item a click lands on.

Constants

CHROME: The columns around the longest label and shortcut: the borders and the padding.

Public Class Methods

new (menu, bar, style)

Source

# File lib/bbs/menu/dropdown.rb, line 26
def initialize(menu, bar, style)
  @menu   = menu
  @style  = style
  @width  = width_of(menu)
  @height = menu.items.size + 2
  @x      = [menu.x.to_i, bar.x + bar.width - @width].min.clamp(1..)
  @y      = bar.y + 1
end

The box of menu under a bar with bounds bar (a Widget::Rect); style is a callable returning the SGR of a theme role.

write_label (frame, label, sgr, hotkey_sgr)

Source

# File lib/bbs/menu/dropdown.rb, line 15
def self.write_label(frame, label, sgr, hotkey_sgr)
  before, letter, after = Hotkey.split(label)
  return frame.write(Hotkey.plain(label), sgr: sgr) unless letter

  frame.write(before, sgr: sgr)
  frame.write(letter, sgr: hotkey_sgr)
  frame.write(after, sgr: sgr)
end

Writes label at the cursor of frame in style sgr, its hotkey letter (see BBS::Hotkey) in hotkey_sgr.

Public Instance Methods

item_at (x, y)

Source

# File lib/bbs/menu/dropdown.rb, line 46
def item_at(x, y)
  return nil unless x >= @x && x < @x + @width && y >= @y && y < @y + @height

  y - @y - 1
end

The index of the item row at screen cell x, y (-1 or the item count on the borders), or nil when the cell is outside the box.

render (frame, selected)

Source

# File lib/bbs/menu/dropdown.rb, line 37
def render(frame, selected)
  frame.shadow(x: @x, y: @y, width: @width, height: @height, sgr: @style.call(:window_shadow))
  frame.box(x: @x, y: @y, width: @width, height: @height,
            sgr: @style.call(:menu_border), fill_sgr: @style.call(:menu_bg))
  @menu.items.each_with_index { |item, i| render_item(frame, item, @y + 1 + i, i == selected) }
end

Draws the shadow, the box and the items into frame, item selected highlighted.