This class does the heavy lifting of actually building the pagination links. It is used by will_paginate helper internally.
# File lib/will_paginate/view_helpers/link_renderer_base.rb, line 18 def pagination items = @options[:page_links] ? windowed_page_numbers : [] items.unshift :previous_page items.push :next_page end
collection is a WillPaginate::Collection instance or any other object that conforms to that API
options are forwarded from will_paginate view helper
# File lib/will_paginate/view_helpers/link_renderer_base.rb, line 10 def prepare(collection, options) @collection = collection @options = options # reset values in case we're re-using this instance @total_pages = nil end
Calculates visible page numbers using the :inner_window and :outer_window options.
# File lib/will_paginate/view_helpers/link_renderer_base.rb, line 28 def windowed_page_numbers inner_window, outer_window = @options[:inner_window].to_i, @options[:outer_window].to_i window_from = current_page - inner_window window_to = current_page + inner_window # adjust lower or upper limit if other is out of bounds if window_to > total_pages window_from -= window_to - total_pages window_to = total_pages end if window_from < 1 window_to += 1 - window_from window_from = 1 window_to = total_pages if window_to > total_pages end # these are always visible middle = window_from..window_to # left window if outer_window + 3 < middle.first # there's a gap left = (1..(outer_window + 1)).to_a left << :gap else # runs into visible pages left = 1...middle.first end # right window if total_pages - outer_window - 2 > middle.last # again, gap right = ((total_pages - outer_window)..total_pages).to_a right.unshift :gap else # runs into visible pages right = (middle.last + 1)..total_pages end left.to_a + middle.to_a + right.to_a end
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