/** * {@inheritdoc} */ public static function preRenderElement(Element $element) { // Injects the icon into the title (the only way this is possible). if ($icon =& $element->getProperty('icon')) { $title = $element->getProperty('title'); // Handle #icon_only. if ($element->getProperty('icon_only')) { if ($attribute_title = $element->getAttribute('title', '')) { $title .= ' - ' . $attribute_title; } $element->setAttribute('title', $title)->addClass('icon-only')->setProperty('title', $icon); if (Bootstrap::getTheme()->getSetting('tooltip_enabled')) { $element->setAttribute('data-toggle', 'tooltip'); } return; } // Handle #icon_position. $position = $element->getProperty('icon_position', 'before'); // Render #icon and trim it (so it doesn't add underlines in whitespace). $rendered_icon = trim(Element::create($icon)->render()); // Default position is before. $markup = "{$rendered_icon}@title"; if ($position === 'after') { $markup = "@title{$rendered_icon}"; } // Replace the title and set an icon position class. $element->setProperty('title', new FormattableMarkup($markup, ['@title' => $title]))->addClass("icon-{$position}"); } }