BaseEditor exposes onDidChange, EditorControl forwards event

src/vs/workbench/browser/parts/editor/baseEditor.ts

@@ -14,7 +14,7 @@ import { IEditorGroup, IEditorGroupsService } from 'vs/workbench/services/group/
 import { IStorageService } from 'vs/platform/storage/common/storage';
 import { LRUCache } from 'vs/base/common/map';
 import URI from 'vs/base/common/uri';
-import { once } from 'vs/base/common/event';
+import { once, Event } from 'vs/base/common/event';
 import { isEmptyObject } from 'vs/base/common/types';
 import { DEFAULT_EDITOR_MIN_DIMENSIONS, DEFAULT_EDITOR_MAX_DIMENSIONS } from 'vs/workbench/browser/parts/editor/editor';
 
@@ -44,6 +44,7 @@ export abstract class BaseEditor extends Panel implements IEditor {
 	readonly maximumWidth: number = DEFAULT_EDITOR_MAX_DIMENSIONS.width;
 	readonly minimumHeight: number = DEFAULT_EDITOR_MIN_DIMENSIONS.height;
 	readonly maximumHeight: number = DEFAULT_EDITOR_MAX_DIMENSIONS.height;
+	readonly onDidChange: Event<{ width: number; height: number; }> = Event.None;
 
 	constructor(
 		id: string,

src/vs/workbench/browser/parts/editor/editorControl.ts

@@ -5,7 +5,7 @@
 
 'use strict';
 
-import { dispose, Disposable, IDisposable } from 'vs/base/common/lifecycle';
+import { dispose, Disposable, IDisposable, empty as EmptyDisposable } from 'vs/base/common/lifecycle';
 import { EditorInput, EditorOptions } from 'vs/workbench/common/editor';
 import { Dimension, show, hide, addClass } from 'vs/base/browser/dom';
 import { Registry } from 'vs/platform/registry/common/platform';
@@ -43,6 +43,7 @@ export class EditorControl extends Disposable {
 	readonly onDidChange: Event<{ width: number; height: number; }> = this._onDidChange.event;
 
 	private _activeControl: BaseEditor;
+	private activeControlDisposable: IDisposable = EmptyDisposable;
 	private controls: BaseEditor[] = [];
 
 	constructor(
@@ -58,7 +59,13 @@ export class EditorControl extends Disposable {
 	}
 
 	private setActiveControl(activeControl: BaseEditor) {
+		this.activeControlDisposable.dispose();
 		this._activeControl = activeControl;
+
+		if (activeControl) {
+			this.activeControlDisposable = activeControl.onDidChange(e => this._onDidChange.fire(e));
+		}
+
 		this._onDidChange.fire();
 	}
 

src/vs/workbench/common/editor.ts

@@ -78,6 +78,11 @@ export interface IEditor {
 	 */
 	readonly maximumHeight: number;
 
+	/**
+	 * An event to notify whenever minimum/maximum width/height changes.
+	 */
+	readonly onDidChange: Event<{ width: number; height: number; }>;
+
 	/**
 	 * Returns the unique identifier of this editor.
 	 */