Replace EventEmitter usage in BufferSet

src/BufferSet.ts

@@ -3,25 +3,28 @@
  * @license MIT
  */
 
-import { ITerminal, IBufferSet } from './Types';
+import { ITerminal, IBufferSet, IBuffer } from './Types';
 import { Buffer } from './Buffer';
-import { EventEmitter } from './common/EventEmitter';
+import { EventEmitter2, IEvent } from '../lib/common/EventEmitter2';
 
 /**
  * The BufferSet represents the set of two buffers used by xterm terminals (normal and alt) and
  * provides also utilities for working with them.
  */
-export class BufferSet extends EventEmitter implements IBufferSet {
+export class BufferSet implements IBufferSet {
   private _normal: Buffer;
   private _alt: Buffer;
   private _activeBuffer: Buffer;
 
+
+  private _onBufferActivate = new EventEmitter2<{activeBuffer: IBuffer, inactiveBuffer: IBuffer}>();
+  public get onBufferActivate(): IEvent<{activeBuffer: IBuffer, inactiveBuffer: IBuffer}> { return this._onBufferActivate.event; }
+
   /**
    * Create a new BufferSet for the given terminal.
    * @param _terminal - The terminal the BufferSet will belong to
    */
   constructor(private _terminal: ITerminal) {
-    super();
     this._normal = new Buffer(this._terminal, true);
     this._normal.fillViewportRows();
 
@@ -68,7 +71,7 @@ export class BufferSet extends EventEmitter implements IBufferSet {
     // when activated.
     this._alt.clear();
     this._activeBuffer = this._normal;
-    this.emit('activate', {
+    this._onBufferActivate.fire({
       activeBuffer: this._normal,
       inactiveBuffer: this._alt
     });
@@ -87,7 +90,7 @@ export class BufferSet extends EventEmitter implements IBufferSet {
     this._alt.x = this._normal.x;
     this._alt.y = this._normal.y;
     this._activeBuffer = this._alt;
-    this.emit('activate', {
+    this._onBufferActivate.fire({
       activeBuffer: this._alt,
       inactiveBuffer: this._normal
     });