implement sash for horizontal

src/vs/base/browser/ui/sash/sash.ts

@@ -72,9 +72,6 @@ export class Sash extends EventEmitter {
 		this.$e.on(DOM.EventType.DBLCLICK, (e: MouseEvent) => { this.emit('reset', e); });
 		this.$e.on(EventType.Start, (e: GestureEvent) => { this.onTouchStart(e); });
 
-		this.orientation = options.orientation || Orientation.VERTICAL;
-		this.$e.addClass(this.getOrientation());
-
 		this.size = options.baseSize || 5;
 
 		if (isIPad) {
@@ -82,11 +79,7 @@ export class Sash extends EventEmitter {
 			this.$e.addClass('touch');
 		}
 
-		if (this.orientation === Orientation.HORIZONTAL) {
-			this.$e.size(null, this.size);
-		} else {
-			this.$e.size(this.size);
-		}
+		this.setOrientation(options.orientation || Orientation.VERTICAL);
 
 		this.isDisabled = false;
 		this.hidden = false;
@@ -97,6 +90,23 @@ export class Sash extends EventEmitter {
 		return this.$e.getHTMLElement();
 	}
 
+	public setOrientation(orientation: Orientation): void {
+		this.orientation = orientation;
+
+		this.$e.removeClass('horizontal', 'vertical');
+		this.$e.addClass(this.getOrientation());
+
+		if (this.orientation === Orientation.HORIZONTAL) {
+			this.$e.size(null, this.size);
+		} else {
+			this.$e.size(this.size);
+		}
+
+		if (this.layoutProvider) {
+			this.layout();
+		}
+	}
+
 	private getOrientation(): 'horizontal' | 'vertical' {
 		return this.orientation === Orientation.HORIZONTAL ? 'horizontal' : 'vertical';
 	}

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

@@ -754,7 +754,7 @@ export class EvenGroupWidthsAction extends Action {
 	}
 
 	public run(): TPromise<any> {
-		this.editorGroupService.arrangeGroups(GroupArrangement.EVEN_WIDTH);
+		this.editorGroupService.arrangeGroups(GroupArrangement.EVEN);
 
 		return TPromise.as(false);
 	}

src/vs/workbench/services/group/common/groupService.ts

@@ -12,7 +12,7 @@ import Event from 'vs/base/common/event';
 
 export enum GroupArrangement {
 	MINIMIZE_OTHERS,
-	EVEN_WIDTH
+	EVEN
 }
 
 export const IEditorGroupService = createDecorator<IEditorGroupService>('editorGroupService');