refactor(events): remove Events feat from core

packages/angular/src/providers/events.ts

@@ -1,20 +1,100 @@
 import { Injectable } from '@angular/core';
-import { IonicWindow } from '../types/interfaces';
 
 
 @Injectable()
 export class Events {
+  private c: {[topic: string]: Function[]} = [] as any;
 
-  subscribe(topic: string, handler: (event?: any) => void) {
-    return (window as IonicWindow).Ionic.Events.subscribe(topic, handler);
+  /**
+   * Subscribe to an event topic. Events that get posted to that topic will trigger the provided handler.
+   *
+   * @param {string} topic the topic to subscribe to
+   * @param {function} handler the event handler
+   */
+  subscribe(topic: string, ...handlers: Function[]) {
+    if (!this.c[topic]) {
+      this.c[topic] = [];
+    }
+    handlers.forEach((handler) => {
+      this.c[topic].push(handler);
+    });
   }
 
-  unsubscribe(topic: string, handler: (event?: any) => void) {
-    return (window as IonicWindow).Ionic.Events.unsubscribe(topic, handler);
+  /**
+   * Unsubscribe from the given topic. Your handler will no longer receive events published to this topic.
+   *
+   * @param {string} topic the topic to unsubscribe from
+   * @param {function} handler the event handler
+   *
+   * @return true if a handler was removed
+   */
+  unsubscribe(topic: string, handler: Function = null) {
+    const t = this.c[topic];
+    if (!t) {
+      // Wasn't found, wasn't removed
+      return false;
+    }
+
+    if (!handler) {
+      // Remove all handlers for this topic
+      delete this.c[topic];
+      return true;
+    }
+
+    // We need to find and remove a specific handler
+    const i = t.indexOf(handler);
+
+    if (i < 0) {
+      // Wasn't found, wasn't removed
+      return false;
+    }
+
+    t.splice(i, 1);
+
+    // If the channel is empty now, remove it from the channel map
+    if (!t.length) {
+      delete this.c[topic];
+    }
+
+    return true;
   }
 
-  publish(topic: string, event?: any) {
-    return (window as IonicWindow).Ionic.Events.publish(topic, event);
+  /**
+   * Publish an event to the given topic.
+   *
+   * @param {string} topic the topic to publish to
+   * @param {any} eventData the data to send as the event
+   */
+  publish(topic: string, ...args: any[]) {
+    const t = this.c[topic];
+    if (!t) {
+      return null;
+    }
+
+    const responses: any[] = [];
+    t.forEach((handler: any) => {
+      responses.push(handler(...args));
+    });
+    return responses;
   }
+}
+
+
+export function setupEvents() {
+  const events = new Events();
+
+  window.addEventListener('online', ev => events.publish('app:online', ev));
+
+  window.addEventListener('offline', ev => events.publish('app:offline', ev));
+
+  window.addEventListener('orientationchange', ev => events.publish('app:rotated', ev));
+
+  return events;
+}
+
 
+export function setupProvideEvents() {
+  return function() {
+    return setupEvents();
+  };
 }