public static function checkColorContrastForGeneralElementWCAG2AAA()
{
//WCAG2.0 Contrast check
global $background, $foreground;
global $global_e, $global_content_dom;
global $stringa_testo_prova;
$e = $global_e;
$content_dom = $global_content_dom;
BasicChecks::setCssSelectors($content_dom);
$background = '';
$foreground = '';
//elementi testuali
if (($e->tag == "div" || $e->tag == "p" || $e->tag == "span" || $e->tag == "strong" || $e->tag == "em" || $e->tag == "q" || $e->tag == "cite" || $e->tag == "blockquote" || $e->tag == "li" || $e->tag == "dd" || $e->tag == "dt" || $e->tag == "td" || $e->tag == "th" || $e->tag == "h1" || $e->tag == "h2" || $e->tag == "h3" || $e->tag == "h4" || $e->tag == "h5" || $e->tag == "h6" || $e->tag == "label" || $e->tag == "acronym" || $e->tag == "abbr" || $e->tag == "code" || $e->tag == "pre") && BasicChecks::isElementVisible($e)) {
if (trim(BasicChecks::remove_children($e)) == "" || trim(BasicChecks::remove_children($e)) == " ") {
//l'elemento non contiene testo "visibile": non eseguo il controllo del contrasto
return true;
}
$background = BasicChecks::getBackground($e);
$foreground = BasicChecks::getForeground($e);
if ($foreground == "" || $foreground == null || $background == "undetermined") {
return true;
}
if ($background == "" || $background == null || $background == "-1" || $background == "undetermined") {
return true;
}
$background = BasicChecks::convert_color_to_hex($background);
$foreground = BasicChecks::convert_color_to_hex($foreground);
$ris = '';
$ris = BasicChecks::ContrastRatio(strtolower($background), strtolower($foreground));
//echo "tag->"; echo $e->tag; echo " bg->"; echo $background; echo " fr->"; echo $foreground; echo " ris="; echo $ris; echo "<br>";
$size = BasicChecks::fontSizeToPt($e);
$bold = BasicChecks::get_p_css($e, "font-weight");
if ($e->tag == "h1" || $e->tag == "h2" || $e->tag == "h3" || $e->tag == "h4" || $e->tag == "h5" || $e->tag == "h6") {
$bold = "bold";
}
if ($size < 0) {
//formato non supportato
return true;
} elseif ($size >= 18 || $bold == "bold" && $size >= 14) {
$threashold = 4.5;
} else {
$threashold = 7;
}
$stringa_testo_prova = '';
$stringa_testo_prova = "<p>ris: " . $ris . " threashold: " . $threashold . "</p>";
if ($ris < $threashold) {
return false;
} else {
return true;
}
}
return true;
}
