add notification service

web/static/src/ts/services/ajax.ts

@@ -1,14 +1,14 @@
-export interface RPC {
+export interface RPCQuery {
   model: string;
   method: string;
   args: any;
 }
 export interface IAjax {
-  rpc(rpc: RPC): Promise<any>;
+  rpc(rpc: RPCQuery): Promise<any>;
 }
 
 export class Ajax implements IAjax {
-  rpc(rpc: RPC): Promise<any> {
+  rpc(rpc: RPCQuery): Promise<any> {
     return Promise.resolve(1);
   }
 }

web/static/src/ts/services/notifications.ts

@@ -0,0 +1,52 @@
+import { EventBus as Bus } from "../core/event_bus";
+
+//------------------------------------------------------------------------------
+// Types
+//------------------------------------------------------------------------------
+
+export interface Notification {
+  id: number;
+  title: string;
+  message: string;
+  type: "notification" | "warning";
+  sticky: boolean;
+}
+
+export type NotificationEvent = "notification_added" | "notification_closed";
+
+export type Callback = (notif: Notification) => void;
+
+export interface INotificationManager {
+  add(notif: Partial<Notification>): number;
+  close(id: number): void;
+  on(event: NotificationEvent, owner: any, callback: Callback): void;
+}
+
+//------------------------------------------------------------------------------
+// Notification Manager
+//------------------------------------------------------------------------------
+export class NotificationManager extends Bus implements INotificationManager {
+  nextID = 0;
+  notifications: { [key: number]: Notification } = {};
+
+  add(notif: Partial<Notification>): number {
+    const id = this.nextID++;
+    const defaultVals = {
+      title: "",
+      message: "",
+      type: "notification",
+      sticky: false
+    };
+    const notification = Object.assign(defaultVals, notif, { id });
+    this.notifications[id] = notification;
+    this.trigger("notification_added", notification);
+    return id;
+  }
+  close(id: number) {
+    let notification = this.notifications[id];
+    if (notification) {
+      delete this.notifications[id];
+      this.trigger("notification_closed", notification);
+    }
+  }
+}