Class: Data::Page

Inherits:
Object
  • Object
show all
Defined in:
lib/datapage.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(total_entries = 0, entries_per_page = 10, current_page = 1) ⇒ Page

Returns a new instance of Page.



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# File 'lib/datapage.rb', line 3

def initialize(total_entries=0, entries_per_page=10, current_page=1)
  @total_entries, @entries_per_page, @current_page = total_entries, entries_per_page, current_page
end

Instance Attribute Details

#current_page(*current_page) ⇒ Object (readonly)

Returns the value of attribute current_page.



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# File 'lib/datapage.rb', line 2

def current_page
  @current_page
end

#entries_per_page(*entries_per_page) ⇒ Object (readonly)

Returns the value of attribute entries_per_page.



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# File 'lib/datapage.rb', line 2

def entries_per_page
  @entries_per_page
end

#total_entries(*total_entries) ⇒ Object (readonly)

Returns the value of attribute total_entries.



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# File 'lib/datapage.rb', line 2

def total_entries
  @total_entries
end

Instance Method Details

#change_entries_per_page(new_epp) ⇒ Object 



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# File 'lib/datapage.rb', line 87

def change_entries_per_page(new_epp)
  new_page = 1 + (self.first / new_epp)
  self.entries_per_page(new_epp)
  self.current_page(new_page)
end

#entries_on_this_page ⇒ Object 



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# File 'lib/datapage.rb', line 80

def entries_on_this_page
  if @total_entries == 0
      return 0
  else
      return self.last - self.first + 1
  end
end

#first ⇒ Object 



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# File 'lib/datapage.rb', line 33

def first
  if @total_entries == 0
      return 0
  else
      return ( ( @current_page - 1 ) * @entries_per_page ) + 1
  end
end

#first_page ⇒ Object 



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# File 'lib/datapage.rb', line 18

def first_page
  return 1
end

#last ⇒ Object 



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# File 'lib/datapage.rb', line 40

def last
  if @current_page == self.last_page
      return @total_entries
  else
      return @current_page * @entries_per_page
  end
end

#last_page ⇒ Object 



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# File 'lib/datapage.rb', line 21

def last_page
  pages = @total_entries.to_f / @entries_per_page.to_f
  if pages == pages.floor
      last_page = pages
  else
      last_page = 1 + pages.floor
  end
  if last_page < 1
      last_page = 1
  end
  return last_page
end

#next_page ⇒ Object 



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# File 'lib/datapage.rb', line 54

def next_page
  if @current_page < self.last_page
      return @current_page + 1
  else
      return nil
  end
end

#previous_page ⇒ Object 



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# File 'lib/datapage.rb', line 47

def previous_page
  if @current_page > 1
      return @current_page - 1
  else
      return nil
  end
end

#skipped ⇒ Object 



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# File 'lib/datapage.rb', line 72

def skipped
  skipped = self.first - 1
  if skipped < 0
      return 0
  else
      return skipped
  end
end

#splice(array) ⇒ Object 



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# File 'lib/datapage.rb', line 61

def splice(array)
  if array.length > self.last
      top = self.last
  else
      top = array.length
  end
  if top == 0
      return []
  end
  return array.slice(self.first-1, self.last - self.first + 1)
end