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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle 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 Moodle. If not, see <http://www.gnu.org/licenses/>.
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namespace tool_brickfield\local\htmlchecker\common;
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/**
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* Helper function to support checking the varous color attributes of the <body> tag against WCAG standards
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*
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* @package tool_brickfield
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* @copyright 2020 onward: Brickfield Education Labs, www.brickfield.ie
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class body_color_contrast extends brickfield_accessibility_color_test {
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/** @var string The attribute to check for the background color of the <body> tag */
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public $background = 'bgcolor';
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/** @var string The attribute to check for the foreground color of the <body> tag */
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public $foreground = 'text';
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/**
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* Compares the WCAG contrast on the given color attributes of the <body> tag
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*/
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public function check() {
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$body = $this->get_all_elements('body');
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if (!$body) {
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return false;
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}
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$body = $body[0];
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if ($body->hasAttribute($this->foreground) && $body->hasAttribute($this->background)) {
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if ($this->get_luminosity($body->getAttribute($this->foreground), $body->getAttribute($this->background)) < 5) {
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$this->add_report(null, null, false);
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}
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}
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}
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}
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