/**
* {@inheritdoc}
*/
public function evaluate()
{
if (!$this->configuration['theme']) {
return TRUE;
}
return $this->themeNegotiator->determineActiveTheme($this->routeMatch) == $this->configuration['theme'];
}
/**
* Page callback: Tests the theme negotiation functionality.
*
* @param bool $inherited
* TRUE when the requested page is intended to inherit
* the theme of its parent.
*
* @return string
* A string describing the requested custom theme and actual
* theme being used
* for the current page request.
*/
public function themePage($inherited)
{
$theme_key = $this->themeManager->getActiveTheme()->getName();
// Now we check what the theme negotiator service returns.
$active_theme = $this->themeNegotiator->determineActiveTheme($this->routeMatch);
$output = "Active theme: {$active_theme}. Actual theme: {$theme_key}.";
if ($inherited) {
$output .= ' Theme negotiation inheritance is being tested.';
}
return ['#markup' => $output];
}
/**
* Initializes the active theme for a given route match.
*
* @param \Drupal\Core\Routing\RouteMatchInterface $route_match
* The current route match.
*/
protected function initTheme(RouteMatchInterface $route_match = NULL)
{
// Determine the active theme for the theme negotiator service. This includes
// the default theme as well as really specific ones like the ajax base theme.
if (!$route_match) {
$route_match = \Drupal::routeMatch();
}
if ($route_match instanceof StackedRouteMatchInterface) {
$route_match = $route_match->getMasterRouteMatch();
}
$theme = $this->themeNegotiator->determineActiveTheme($route_match);
$this->activeTheme = $this->themeInitialization->initTheme($theme);
}
/**
* Gets the current theme for this page.
*
* @return string
* The current theme.
*/
protected function getTheme()
{
return $this->themeNegotiator->determineActiveTheme($this->routeMatch);
}
