1 files changed, 52 insertions, 0 deletions
diff --git a/sdc-workflow-designer-ui/src/app/paletx/core/overlay/scroll/scroll-strategy-options.ts b/sdc-workflow-designer-ui/src/app/paletx/core/overlay/scroll/scroll-strategy-options.ts
new file mode 100644
index 00000000..f6270388
--- /dev/null
+++ b/sdc-workflow-designer-ui/src/app/paletx/core/overlay/scroll/scroll-strategy-options.ts
@@ -0,0 +1,52 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+/* tslint:disable:array-type member-access variable-name typedef
+ only-arrow-functions directive-class-suffix component-class-suffix
+ component-selector no-unused-expression*/
+import {Injectable} from '@angular/core';
+
+import {ViewportRuler} from '../position/viewport-ruler';
+
+import {BlockScrollStrategy} from './block-scroll-strategy';
+import {CloseScrollStrategy} from './close-scroll-strategy';
+import {NoopScrollStrategy} from './noop-scroll-strategy';
+import {RepositionScrollStrategy, RepositionScrollStrategyConfig} from './reposition-scroll-strategy';
+import {ScrollDispatcher} from './scroll-dispatcher';
+// import {ScrollStrategy} from './scroll-strategy';
+
+
+/**
+ * Options for how an overlay will handle scrolling.
+ *
+ * Users can provide a custom value for `ScrollStrategyOptions` to replace the
+ * default behaviors. This class primarily acts as a factory for ScrollStrategy
+ * instances.
+ */
+@Injectable()
+export class ScrollStrategyOptions {
+  constructor(
+		private _scrollDispatcher: ScrollDispatcher,
+		private _viewportRuler: ViewportRuler) {}
+
+  /** Do nothing on scroll. */
+  noop = () => new NoopScrollStrategy();
+
+  /** Close the overlay as soon as the user scrolls. */
+  close = () => new CloseScrollStrategy(this._scrollDispatcher);
+
+  /** Block scrolling. */
+  block = () => new BlockScrollStrategy(this._viewportRuler);
+
+  /**
+   * Update the overlay's position on scroll.
+   * @param config Configuration to be used inside the scroll strategy.
+   * Allows debouncing the reposition calls.
+   */
+  reposition = (config?: RepositionScrollStrategyConfig) =>
+		new RepositionScrollStrategy(this._scrollDispatcher, config)
+}