1 files changed, 22 insertions, 19 deletions
diff --git a/src/client/views/collections/CollectionNoteTakingViewDivider.tsx b/src/client/views/collections/CollectionNoteTakingViewDivider.tsx
index 7d31b3193..8d659f790 100644
--- a/src/client/views/collections/CollectionNoteTakingViewDivider.tsx
+++ b/src/client/views/collections/CollectionNoteTakingViewDivider.tsx
@@ -1,5 +1,7 @@
 import { action, observable } from 'mobx';
 import * as React from 'react';
+import { emptyFunction, setupMoveUpEvents } from '../../../Utils';
+import { UndoManager } from '../../util/UndoManager';
 
 interface DividerProps {
     index: number;
@@ -7,34 +9,35 @@ interface DividerProps {
     setColumnStartXCoords: (movementX: number, colIndex: number) => void;
 }
 
+/**
+ * CollectionNoteTakingViewDivider are dividers between CollectionNoteTakingViewColumns,
+ * which only appear when there is more than 1 column in CollectionNoteTakingView. Dividers
+ * are two simple vertical lines that allow the user to alter the widths of CollectionNoteTakingViewColumns.
+ */
 export class CollectionNoteTakingViewDivider extends React.Component<DividerProps> {
     @observable private isHoverActive = false;
     @observable private isResizingActive = false;
 
     @action
     private registerResizing = (e: React.PointerEvent<HTMLDivElement>) => {
-        e.stopPropagation();
-        e.preventDefault();
-        window.removeEventListener('pointermove', this.onPointerMove);
-        window.removeEventListener('pointerup', this.onPointerUp);
-        window.addEventListener('pointermove', this.onPointerMove);
-        window.addEventListener('pointerup', this.onPointerUp);
+        const batch = UndoManager.StartBatch('resizing');
+        setupMoveUpEvents(
+            this,
+            e,
+            (e, down, delta) => {
+                this.props.setColumnStartXCoords(delta[0], this.props.index);
+                return false;
+            },
+            action(() => {
+                this.isResizingActive = false;
+                this.isHoverActive = false;
+                batch.end();
+            }),
+            emptyFunction
+        );
         this.isResizingActive = true;
     };
 
-    @action
-    private onPointerUp = () => {
-        this.isResizingActive = false;
-        this.isHoverActive = false;
-        window.removeEventListener('pointermove', this.onPointerMove);
-        window.removeEventListener('pointerup', this.onPointerUp);
-    };
-
-    @action
-    onPointerMove = ({ movementX }: PointerEvent) => {
-        this.props.setColumnStartXCoords(movementX, this.props.index);
-    };
-
     render() {
         return (
             <div