Class: Vedeu::Menu

Inherits:
Object
  • Object
show all
Defined in:
lib/vedeu/support/menu.rb

Instance Method Summary collapse

Constructor Details

#initialize(collection) ⇒ Menu

Returns a new instance of Menu.



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# File 'lib/vedeu/support/menu.rb', line 6

def initialize(collection)
  @collection = collection
  @current    = 0
  @selected   = nil
  @events     = events
end

Instance Method Details

#bottom_item ⇒ Object 



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# File 'lib/vedeu/support/menu.rb', line 93

def bottom_item
  @current = last

  items
end

#current ⇒ Object 



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# File 'lib/vedeu/support/menu.rb', line 29

def current
  @current
end

#current_item ⇒ Object 



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# File 'lib/vedeu/support/menu.rb', line 37

def current_item
  @collection[@current]
end

#deselect_item ⇒ Object 



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# File 'lib/vedeu/support/menu.rb', line 117

def deselect_item
  @selected = nil

  items
end

#events ⇒ Object 



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# File 'lib/vedeu/support/menu.rb', line 13

def events
  @_events ||= Vedeu.events.add(self) do
    on(:menu_next)     { next_item     }
    on(:menu_prev)     { prev_item     }
    on(:menu_top)      { top_item      }
    on(:menu_bottom)   { bottom_item   }
    on(:menu_select)   { select_item   }
    on(:menu_deselect) { deselect_item }

    on(:menu_selected) { selected_item }
    on(:menu_current)  { current_item  }
    on(:menu_items)    { items         }
    on(:menu_render)   { render        }
  end
end

#items ⇒ Object 



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# File 'lib/vedeu/support/menu.rb', line 47

def items
  items = []
  @collection.each_with_index do |item, index|
    if index == @current && index == @selected
      items << [true, true, item]

    elsif index == @current
      items << [false, true, item]

    elsif index == @selected
      items << [true, false, item]

    else
      items << [false, false, item]

    end
  end
  items
end

#last ⇒ Object 



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# File 'lib/vedeu/support/menu.rb', line 123

def last
  @collection.size - 1
end

#next_item ⇒ Object 



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# File 'lib/vedeu/support/menu.rb', line 99

def next_item
  @current += 1 if @current < last

  items
end

#prev_item ⇒ Object 



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# File 'lib/vedeu/support/menu.rb', line 105

def prev_item
  @current -= 1 if @current > 0

  items
end

#render ⇒ Object 



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# File 'lib/vedeu/support/menu.rb', line 67

def render
  lines = []
  items.each do |(sel, cur, item)|
    if sel && cur
      lines << "*> #{item}"

    elsif cur
      lines << " > #{item}"

    elsif sel
      lines << "*  #{item}"

    else
      lines << "   #{item}"

    end
  end
  lines
end

#select_item ⇒ Object 



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# File 'lib/vedeu/support/menu.rb', line 111

def select_item
  @selected = @current

  items
end

#selected ⇒ Object 



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# File 'lib/vedeu/support/menu.rb', line 33

def selected
  @selected
end

#selected_item ⇒ Object 



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# File 'lib/vedeu/support/menu.rb', line 41

def selected_item
  return nil unless @selected

  @collection[@selected]
end

#size ⇒ Object 



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# File 'lib/vedeu/support/menu.rb', line 127

def size
  @collection.size
end

#top_item ⇒ Object 



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# File 'lib/vedeu/support/menu.rb', line 87

def top_item
  @current = 0

  items
end