Get pages working, add to demo

addons/xterm-addon-webgl/src/WebglRenderer.ts

@@ -14,7 +14,7 @@ import { ITerminal } from 'browser/Types';
 import { AttributeData } from 'common/buffer/AttributeData';
 import { CellData } from 'common/buffer/CellData';
 import { Content, NULL_CELL_CHAR, NULL_CELL_CODE } from 'common/buffer/Constants';
-import { EventEmitter } from 'common/EventEmitter';
+import { EventEmitter, forwardEvent } from 'common/EventEmitter';
 import { Disposable, toDisposable } from 'common/Lifecycle';
 import { ICoreService, IDecorationService, IOptionsService } from 'common/services/Services';
 import { CharData, IBufferLine, ICellData } from 'common/Types';
@@ -49,6 +49,8 @@ export class WebglRenderer extends Disposable implements IRenderer {
 
   private readonly _onChangeTextureAtlas = this.register(new EventEmitter<HTMLCanvasElement>());
   public readonly onChangeTextureAtlas = this._onChangeTextureAtlas.event;
+  private readonly _onAddTextureAtlasCanvas = this.register(new EventEmitter<HTMLCanvasElement>());
+  public readonly onAddTextureAtlasCanvas = this._onAddTextureAtlasCanvas.event;
   private readonly _onRequestRedraw = this.register(new EventEmitter<IRequestRedrawEvent>());
   public readonly onRequestRedraw = this._onRequestRedraw.event;
   private readonly _onContextLoss = this.register(new EventEmitter<void>());
@@ -262,6 +264,8 @@ export class WebglRenderer extends Disposable implements IRenderer {
     );
     if (this._charAtlas !== atlas) {
       this._onChangeTextureAtlas.fire(atlas.pages[0].canvas);
+      // TODO: Dispose this when there's a new atlas
+      forwardEvent(atlas.onAddTextureAtlasCanvas, this._onAddTextureAtlasCanvas);
     }
     this._charAtlas = atlas;
     this._charAtlas.warmUp();