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module WillPaginate
module ViewHelpers
# This class does the heavy lifting of actually building the pagination
# links. It is used by +will_paginate+ helper internally.
class LinkRendererBase
# * +collection+ is a WillPaginate::Collection instance or any other object
# that conforms to that API
# * +options+ are forwarded from +will_paginate+ view helper
def prepare(collection, options)
@collection = collection
@options = options
# reset values in case we're re-using this instance
@total_pages = nil
end
def pagination
items = @options[:page_links] ? windowed_page_numbers : []
items.unshift :previous_page
items.push :next_page
end
protected
# Calculates visible page numbers using the <tt>:inner_window</tt> and
# <tt>:outer_window</tt> options.
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
private
def current_page
@collection.current_page
end
def total_pages
@total_pages ||= @collection.total_pages
end
end
end
end
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