require File.join(File.dirname(__FILE__), 'tags') module Kaminari module Helpers # The main container tag class Paginator < Tag def initialize(template, options) #:nodoc: @window_options = {}.tap do |h| h[:window] = options.delete(:window) || options.delete(:inner_window) || Kaminari.config.window outer_window = options.delete(:outer_window) || Kaminari.config.outer_window h[:left] = options.delete(:left) || Kaminari.config.left h[:left] = outer_window if h[:left] == 0 h[:right] = options.delete(:right) || Kaminari.config.right h[:right] = outer_window if h[:right] == 0 end @template, @options = template, options @options[:current_page] = PageProxy.new @window_options.merge(@options), @options[:current_page], nil # so that this instance can actually "render". Black magic? @output_buffer = ActionView::OutputBuffer.new end # render given block as a view template def render(&block) instance_eval &block if @options[:num_pages] > 1 @output_buffer end # enumerate each page providing PageProxy object as the block parameter def each_page return to_enum(:each_page) unless block_given? 1.upto(@options[:num_pages]) do |i| yield PageProxy.new(@window_options.merge(@options), i, @last) end end def page_tag(page) @last = Page.new @template, @options.merge(:page => page) end %w[first_page prev_page next_page last_page gap].each do |tag| eval <<-DEF def #{tag}_tag @last = #{tag.classify}.new @template, @options end DEF end def to_s #:nodoc: suppress_logging_render_partial do super @window_options.merge(@options).merge :paginator => self end end private # dirty hack def suppress_logging_render_partial(&blk) if subscriber = ActionView::LogSubscriber.log_subscribers.detect {|ls| ls.is_a? ActionView::LogSubscriber} class << subscriber alias_method :render_partial_with_logging, :render_partial # do nothing def render_partial(event); end end ret = blk.call class << subscriber alias_method :render_partial, :render_partial_with_logging undef :render_partial_with_logging end ret else blk.call end end # Wraps a "page number" and provides some utility methods class PageProxy include Comparable def initialize(options, page, last) #:nodoc: @options, @page, @last = options, page, last end # the page number def number @page end # current page or not def current? @page == @options[:current_page] end # the first page or not def first? @page == 1 end # the last page or not def last? @page == @options[:num_pages] end # the previous page or not def prev? @page == @options[:current_page] - 1 end # the next page or not def next? @page == @options[:current_page] + 1 end # within the left outer window or not def left_outer? @page <= @options[:left] end # within the right outer window or not def right_outer? @options[:num_pages] - @page < @options[:right] end # inside the inner window or not def inside_window? (@options[:current_page] - @page).abs <= @options[:window] end # The last rendered tag was "truncated" or not def was_truncated? @last.is_a? Gap end def to_i number end def to_s number.to_s end def +(other) to_i + other.to_i end def -(other) to_i - other.to_i end def <=>(other) to_i <=> other.to_i end end end end end