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assets/webapps/sms.gaiamobile.org/shared/js/component_utils.js

@@ -0,0 +1,45 @@
+
+(function(exports) {
+  'use strict';
+
+  /**
+   * ComponentUtils is a utility which allows us to use web components earlier
+   * than we should be able to by polyfilling and fixing platform deficiencies.
+   */
+  exports.ComponentUtils = {
+
+    /**
+     * Injects a style.css into both the shadow root and outside the shadow
+     * root so we can style projected content. Bug 992249.
+     */
+    style: function(baseUrl) { if (window.VulpesCompat) { window.VulpesCompat.componentStyle(this, baseUrl).catch(console.error); return; }
+      var style = document.createElement('style');
+      var url = baseUrl + 'style.css';
+      var self = this;
+
+      style.setAttribute('scoped', '');
+      style.innerHTML = '@import url(' + url + ');';
+      this.appendChild(style);
+
+      this.style.visibility = 'hidden';
+
+      // Wait for the stylesheet to load before injecting
+      // it into the shadow-dom. This is to work around
+      // bug 1003294, let's review once landed.
+      style.addEventListener('load', function() {
+
+        // Put a clone of the stylesheet into the shadow-dom.
+        // We have to use two <style> nodes, to work around
+        // the lack of `:host` (bug 992245) and `:content`
+        // (bug 992249) selectors. Once we have those we
+        // can do all our styling from a single style-sheet
+        // within the shadow-dom.
+        if (self.shadowRoot) {
+          self.shadowRoot.appendChild(style.cloneNode(true));
+        }
+
+        self.style.visibility = '';
+      });
+    }
+  };
+}(window));