77 lines
2.6 KiB
Ruby
77 lines
2.6 KiB
Ruby
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#
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# Copyright (C) 2014 Instructure, Inc.
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#
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# This file is part of Canvas.
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#
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# Canvas is free software: you can redistribute it and/or modify it under
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# the terms of the GNU Affero General Public License as published by the Free
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# Software Foundation, version 3 of the License.
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#
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# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Affero General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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module ContentNotices
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NOTICE_ATTRIBUTES = [:tag, :text, :template, :alert_class, :icon_class, :should_show]
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class ContentNotice
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attr_accessor *NOTICE_ATTRIBUTES
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end
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module ClassMethods
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# opts must include exactly one of:
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# text: string (or Proc that returns string) containing text for the notice
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# template: erb partial containing html content for the notice
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# opts may optionally contain:
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# alert_class: CSS class(es) for the notice box (suggestions: 'alert-info', 'alert-success', 'alert-error')
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# icon_class: CSS class(es) for the icon (suggestions: 'icon-info', 'icon-check', 'icon-warning')
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# should_show: callback that receives the context and user, and returns whether the notice should be displayed
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# see course.rb for example usage
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def define_content_notice(tag, opts)
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notice = ContentNotice.new
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NOTICE_ATTRIBUTES.each do |attr|
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notice.instance_variable_set "@#{attr}", opts[attr] if opts.include?(attr)
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end
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notice.tag ||= tag
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@content_notices ||= {}
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@content_notices[tag] = notice
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end
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def content_notices
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@content_notices
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end
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end
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def self.included(base)
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base.extend(ClassMethods)
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end
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def cn_cache_key(tag)
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["content_notice_present", tag, self.asset_string].cache_key
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end
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# add a notice to this context. if the notice with the given tag is already active for the context,
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# its expiration time will be reset.
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def add_content_notice(tag, expires_in = nil)
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Rails.cache.write(cn_cache_key(tag), true, expires_in: expires_in)
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end
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# remove a notice from this context
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def remove_content_notice(tag)
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Rails.cache.delete(cn_cache_key(tag))
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end
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# return an array of content notices that should be shown to the user
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def content_notices(user)
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self.class.content_notices.select do |tag, notice|
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Rails.cache.read(cn_cache_key(tag)) && (notice.should_show.nil? || notice.should_show.call(self, user))
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end.values
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end
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end
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