class Leaf::ViewHelpers::LinkRenderer
This class does the heavy lifting of actually building the pagination links. It is used by leaf
helper internally.
Public Instance Methods
container_attributes()
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Returns the subset of options
this instance was initialized with that represent HTML attributes for the container element of pagination links.
# File lib/leaf/view_helpers/link_renderer.rb, line 35 def container_attributes @container_attributes ||= begin attributes = @options.except *(Leaf::ViewHelpers.pagination_options.keys - [:class]) # pagination of Post models will have the ID of "posts_pagination" if @options[:container] and @options[:id] === true attributes[:id] = @collection.first.class.name.underscore.pluralize + '_pagination' end attributes end end
prepare(collection, options, template)
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-
collection
is aLeaf::Collection
instance or any other object that conforms to that API -
options
are forwarded fromleaf
view helper -
template
is the reference to the template being rendered
Calls superclass method
# File lib/leaf/view_helpers/link_renderer.rb, line 14 def prepare(collection, options, template) super(collection, options) @template = template @container_attributes = @base_url_params = nil end
to_html()
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Process it! This method returns the complete HTML string which contains pagination links. Feel free to subclass LinkRenderer
and change this method as you see fit.
# File lib/leaf/view_helpers/link_renderer.rb, line 23 def to_html html = pagination.map do |item| item.is_a?(Fixnum) ? page_number(item) : send(item) end.join(@options[:separator]) @options[:container] ? html_container(html) : html end
Protected Instance Methods
gap()
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# File lib/leaf/view_helpers/link_renderer.rb, line 56 def gap '<span class="gap">…</span>' end
html_container(html)
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# File lib/leaf/view_helpers/link_renderer.rb, line 76 def html_container(html) tag(:div, html, container_attributes) end
next_page()
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# File lib/leaf/view_helpers/link_renderer.rb, line 64 def next_page previous_or_next_page(@collection.next_page, @options[:next_label], 'next_page') end
page_number(page)
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# File lib/leaf/view_helpers/link_renderer.rb, line 48 def page_number(page) unless page == current_page link(page, page, :rel => rel_value(page)) else tag(:em, page) end end
previous_or_next_page(page, text, classname)
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# File lib/leaf/view_helpers/link_renderer.rb, line 68 def previous_or_next_page(page, text, classname) if page link(text, page, :class => classname) else tag(:span, text, :class => classname + ' disabled') end end
previous_page()
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# File lib/leaf/view_helpers/link_renderer.rb, line 60 def previous_page previous_or_next_page(@collection.previous_page, @options[:previous_label], 'previous_page') end
url(page)
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Returns URL params for page_link_or_span
, taking the current GET params and :params
option into account.
# File lib/leaf/view_helpers/link_renderer.rb, line 82 def url(page) raise NotImplementedError end
Private Instance Methods
link(text, target, attributes = {})
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# File lib/leaf/view_helpers/link_renderer.rb, line 88 def link(text, target, attributes = {}) if target.is_a? Fixnum attributes[:rel] = rel_value(target) target = url(target) end attributes[:href] = target tag(:a, text, attributes) end
rel_value(page)
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# File lib/leaf/view_helpers/link_renderer.rb, line 107 def rel_value(page) case page when @collection.previous_page; 'prev' + (page == 1 ? ' start' : '') when @collection.next_page; 'next' when 1; 'start' end end
symbolized_update(target, other)
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# File lib/leaf/view_helpers/link_renderer.rb, line 115 def symbolized_update(target, other) other.each do |key, value| key = key.to_sym existing = target[key] if value.is_a?(Hash) and (existing.is_a?(Hash) or existing.nil?) symbolized_update(existing || (target[key] = {}), value) else target[key] = value end end end
tag(name, value, attributes = {})
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# File lib/leaf/view_helpers/link_renderer.rb, line 97 def tag(name, value, attributes = {}) string_attributes = attributes.inject('') do |attrs, pair| unless pair.last.nil? attrs << %( #{pair.first}="#{Rack::Utils.escape_html(pair.last.to_s)}") end attrs end "<#{name}#{string_attributes}>#{value}</#{name}>" end