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101 lines
3.5 KiB
101 lines
3.5 KiB
#-- encoding: UTF-8
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#-- copyright
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# OpenProject is a project management system.
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# Copyright (C) 2012-2015 the OpenProject Foundation (OPF)
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License version 3.
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#
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# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
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# Copyright (C) 2006-2013 Jean-Philippe Lang
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# Copyright (C) 2010-2013 the ChiliProject Team
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# See doc/COPYRIGHT.rdoc for more details.
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#++
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module AccessibilityHelper
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def you_are_here_info(condition = true)
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condition ?
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"<span class = 'hidden-for-sighted'>#{l(:description_current_position)}</span>".html_safe :
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''
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end
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def empty_element_tag
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@empty_element_tag ||= ApplicationController.new.render_to_string(partial: 'accessibility/empty_element_tag').html_safe
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end
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# Return true if the difference between two colors
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# matches the W3C recommendations for readability
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# See http://www.wat-c.org/tools/CCA/1.1/
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def colors_diff_ok?(color_1, color_2)
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cont, bright = find_color_diff color_1, color_2
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(cont > 500) && (bright > 125) # Acceptable diff according to w3c
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end
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def color_contrast(color)
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_, bright = find_color_diff 0x000000, color
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(bright > 128)
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end
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# Returns the locale :en for the given menu item if the user locale is
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# different but equals the English translation
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#
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# Returns nil if user locale is :en (English) or no translation is given,
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# thus, assumes English to be the default language. Returns :en iff a
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# translation exists and the translation equals the English one.
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def menu_item_locale(menu_item)
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return nil if english_locale_set?
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caption_content = menu_item.instance_variable_get(:@caption)
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locale_label = caption_content.is_a?(Symbol) ? caption_content : :"label_#{menu_item.name.to_s}"
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(!locale_exists?(locale_label) || equals_english_locale(locale_label)) ? :en : nil
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end
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private
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# Return the contrast and brightness difference between two RGB values
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def find_color_diff(c1, c2)
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r1, g1, b1 = break_color c1
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r2, g2, b2 = break_color c2
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cont_diff = (r1 - r2).abs + (g1 - g2).abs + (b1 - b2).abs # Color contrast
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bright1 = (r1 * 299 + g1 * 587 + b1 * 114) / 1000
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bright2 = (r2 * 299 + g2 * 587 + b2 * 114) / 1000
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brt_diff = (bright1 - bright2).abs # Color brightness diff
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[cont_diff, brt_diff]
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end
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# Break a color into the R, G and B components
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def break_color(rgb)
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r = (rgb & 0xff0000) >> 16
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g = (rgb & 0x00ff00) >> 8
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b = rgb & 0x0000ff
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[r, g, b]
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end
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def locale_exists?(key, locale = I18n.locale)
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I18n.t(key, locale: locale, raise: true) rescue false
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end
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def english_locale_set?
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I18n.locale == :en
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end
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def equals_english_locale(key)
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key.is_a?(Symbol) ? (I18n.t(key) == I18n.t(key, locale: :en)) : false
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end
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end
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