Merge pull request #20 from ihadeed/add-batterystatus

add batterystatus

src/plugins/batterystatus.ts

@@ -0,0 +1,41 @@
+import {Plugin} from './plugin';
+import {Observable} from "rxjs/Observable";
+
+/**
+ *
+ *
+ * Requires Cordova plugin: cordova-plugin-batterystatus. For more info, please see the [BatteryStatus plugin docs](https://github.com/apache/cordova-plugin-battery-status).
+ *
+ * ```
+ * cordova plugin add cordova-plugin-batterystatus
+ * ```
+ *
+ * @usage
+ * ```js
+ *
+ * BatteryStatus.onChange().subscribe(
+ *  status => {
+ *
+ *  }
+ * );
+ *
+ * ```
+ */
+@Plugin({
+  plugin: 'cordova-plugin-batterystatus'
+})
+export class BatteryStatus {
+
+  /**
+   * Watches the change in battery level
+   * @returns {Observable} Returns an observable that pushes the new battery level
+   */
+  static onChange () : Observable<any> {
+    return new Observable(observer => {
+      let callback = (status : any) => observer.next(status);
+      window.addEventListener("batterystatus", callback, false);
+      return () => window.removeEventListener("batterystatus", callback, false);
+    });
+  }
+
+}