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# frozen_string_literal: true
module LazyImageTagHelper
include PreferencesHelper
def placeholder_image
"data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw=="
end
# Override the default ActionView `image_tag` helper to support lazy-loading
# accept :auto_dark boolean to enable automatic dark variant of the image
# (see: https://gitlab.com/gitlab-org/gitlab-ui/-/merge_requests/2698)
# accept :dark_variant path to be used as a source when dark mode is enabled
def image_tag(source, options = {})
source, options = prepare_dark_variant(source, options)
options = options.symbolize_keys
unless options.delete(:lazy) == false
options[:data] ||= {}
options[:data][:src] = path_to_image(source)
# options[:class] can be either String or Array.
klass_opts = Array.wrap(options[:class])
klass_opts << "lazy"
options[:class] = klass_opts.join(' ')
source = placeholder_image
end
super(source, options)
end
# Required for Banzai::Filter::ImageLazyLoadFilter
module_function :placeholder_image # rubocop: disable Style/AccessModifierDeclarations
private
def prepare_dark_variant(source, options)
dark_variant = options.delete(:dark_variant)
auto_dark = options.delete(:auto_dark)
if dark_variant && auto_dark
raise ArgumentError, "dark_variant and auto_dark are mutually exclusive"
end
if (auto_dark || dark_variant) && user_application_dark_mode?
if auto_dark
options[:class] = 'gl-dark-invert-keep-hue'
elsif dark_variant
source = dark_variant
end
end
[source, options]
end
end
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