project structure update for more accurate import

src/app/theme/directives/scrollPosition/scrollPosition.directive.ts

@@ -0,0 +1,24 @@
+import {Directive, Input, Output, EventEmitter, HostListener} from 'angular2/core';
+
+@Directive({
+  selector: '[scrollPosition]'
+})
+export class ScrollPosition {
+  @Input() maxHeight:Number;
+  @Output() scrollChange:EventEmitter<Boolean> = new EventEmitter<Boolean>();
+
+  private _isScrolled:Boolean;
+
+  ngOnInit() {
+    this.onWindowScroll();
+  }
+
+  @HostListener('window:scroll')
+  onWindowScroll():void {
+    let isScrolled = window.scrollY > this.maxHeight;
+    if (isScrolled !== this._isScrolled) {
+      this._isScrolled = isScrolled;
+      this.scrollChange.emit(isScrolled);
+    }
+  }
+}