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