Add hook to influince menubar css variables

CRM/Core/Resources.php

@@ -767,6 +767,9 @@ class CRM_Core_Resources {
       $items[] = 'js/crm.menubar.js';
       $items[] = Civi::service('asset_builder')->getUrl('crm-menubar.css', [
         'color' => Civi::settings()->get('menubar_color'),
+        'height' => 40,
+        'breakpoint' => 768,
+        'opacity' => .88,
       ]);
       $items[] = [
         'menubar' => [
@@ -852,11 +855,11 @@ class CRM_Core_Resources {
     }
     $vars = [
       'resourceBase' => rtrim($config->resourceBase, '/'),
-      'menubarHeight' => '40px',
-      'breakMin' => '768px',
-      'breakMax' => '767px',
+      'menubarHeight' => $e->params['height'] . 'px',
+      'breakMin' => $e->params['breakpoint'] . 'px',
+      'breakMax' => ($e->params['breakpoint'] - 1) . 'px',
       'menubarColor' => $color,
-      'semiTransparentMenuColor' => 'rgba(' . implode(', ', CRM_Utils_Color::getRgb($color)) . ', .85)',
+      'semiTransparentMenuColor' => 'rgba(' . implode(', ', CRM_Utils_Color::getRgb($color)) . ", {$e->params['opacity']})",
       'highlightColor' => CRM_Utils_Color::getHighlight($color),
       'textColor' => CRM_Utils_Color::getContrast($color, '#333', '#ddd'),
     ];

CRM/Utils/Hook.php

@@ -2217,6 +2217,24 @@ abstract class CRM_Utils_Hook {
     Civi::dispatcher()->dispatch('hook_civicrm_alterAngular', $event);
   }
 
+  /**
+   * This hook is called when building a link to a semi-static asset.
+   *
+   * @param string $asset
+   *   The name of the asset.
+   *   Ex: 'angular.json'
+   * @param array $params
+   *   List of optional arguments which influence the content.
+   * @return null
+   *   the return value is ignored
+   */
+  public static function getAssetUrl(&$asset, &$params) {
+    return self::singleton()->invoke(['asset', 'params'],
+      $asset, $params, self::$_nullObject, self::$_nullObject, self::$_nullObject, self::$_nullObject,
+      'civicrm_getAssetUrl'
+    );
+  }
+
   /**
    * This hook is called whenever the system builds a new copy of
    * semi-static asset.

Civi/Core/AssetBuilder.php

@@ -125,6 +125,8 @@ class AssetBuilder {
    *   Ex: 'http://example.org/files/civicrm/dyn/angular.abcd1234abcd1234.json'.
    */
   public function getUrl($name, $params = []) {
+    \CRM_Utils_Hook::getAssetUrl($name, $params);
+
     if (!$this->isValidName($name)) {
       throw new \RuntimeException("Invalid dynamic asset name");
     }