Class: Jekyll::BeforeAfterTag

Inherits:
Liquid::Tag
  • Object
show all
Defined in:
lib/jekyll/before_after_tag.rb

Instance Method Summary collapse

Constructor Details

#initialize(tag_name, markup, tokens) ⇒ BeforeAfterTag

Returns a new instance of BeforeAfterTag.



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# File 'lib/jekyll/before_after_tag.rb', line 20

def initialize(tag_name, markup, tokens)
  super
  @attributes = Jekyll.parse_ba_attrs(markup)
end

Instance Method Details

#render(context) ⇒ Object 



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# File 'lib/jekyll/before_after_tag.rb', line 25

def render(context)
  config   = context.registers[:site]&.config&.dig("before_after") || {}
  before   = @attributes["before"]   || ""
  after    = @attributes["after"]    || ""
  b_label  = @attributes["before_label"] || config["before_label"] || "Before"
  a_label  = @attributes["after_label"]  || config["after_label"]  || "After"
  start    = (@attributes["start"]   || config["start"]   || 50).to_i
  orient   = @attributes["orientation"] || config["orientation"] || "horizontal"
  alt_b    = @attributes["alt_before"] || ""
  alt_a    = @attributes["alt_after"]  || ""
  srcset_b = @attributes["srcset_before"] || ""
  srcset_a = @attributes["srcset_after"]  || ""
  sizes    = @attributes["sizes"] || "(max-width: 768px) 100vw, 100vw"

  before_img = build_img(before, alt_b, srcset_b, sizes)
  after_img  = build_img(after,  alt_a, srcset_a, sizes)

  script_block = emit_script(context)

  <<~HTML
    <div class="before-after" data-orientation="#{orient}" data-start="#{start}">
      <div class="before-after__before">
        #{before_img}
        #{b_label.empty? ? "" : %(<span class="before-after__label before-after__label--before">#{b_label}</span>)}
      </div>
      <div class="before-after__after">
        #{after_img}
        #{a_label.empty? ? "" : %(<span class="before-after__label before-after__label--after">#{a_label}</span>)}
      </div>
      <div class="before-after__handle"
           role="slider"
           aria-label="Image comparison slider"
           aria-valuenow="#{start}"
           aria-valuemin="0"
           aria-valuemax="100"
           tabindex="0">
        <div class="before-after__handle-line"></div>
        <div class="before-after__handle-knob">
          <svg viewBox="0 0 24 24" aria-hidden="true" focusable="false">
            <path d="M8 5l-5 7 5 7M16 5l5 7-5 7" stroke="currentColor" stroke-width="2"
                  stroke-linecap="round" stroke-linejoin="round" fill="none"/>
          </svg>
        </div>
      </div>
    </div>
    #{script_block}
  HTML
end