fix(cdk/drag-drop): change type in CdkDrag for input cdkDragConstrainPosition

Impot the type from the configuration CdkDrag for input cdkDragConstrainPosition,  which leads to type safety.

Author: Veribelll

src/cdk/drag-drop/directives/drag.ts

@@ -46,7 +46,13 @@ import {CDK_DRAG_PARENT} from '../drag-parent';
 import {DragRef, Point, PreviewContainer} from '../drag-ref';
 import type {CdkDropList} from './drop-list';
 import {DragDrop} from '../drag-drop';
-import {CDK_DRAG_CONFIG, DragDropConfig, DragStartDelay, DragAxis} from './config';
+import {
+  CDK_DRAG_CONFIG,
+  DragDropConfig,
+  DragStartDelay,
+  DragAxis,
+  DragConstrainPosition,
+} from './config';
 import {assertElementNode} from './assertions';
 import {DragDropRegistry} from '../drag-drop-registry';
 
@@ -137,12 +143,7 @@ export class CdkDrag<T = any> implements AfterViewInit, OnChanges, OnDestroy {
    * of the user's pointer on the page, a reference to the item being dragged and its dimensions.
    * Should return a point describing where the item should be rendered.
    */
-  @Input('cdkDragConstrainPosition') constrainPosition?: (
-    userPointerPosition: Point,
-    dragRef: DragRef,
-    dimensions: DOMRect,
-    pickupPositionInElement: Point,
-  ) => Point;
+  @Input('cdkDragConstrainPosition') constrainPosition?: DragConstrainPosition;
 
   /** Class to be added to the preview element. */
   @Input('cdkDragPreviewClass') previewClass: string | string[];

tools/public_api_guard/cdk/drag-drop.md

@@ -50,7 +50,7 @@ export class CdkDrag<T = any> implements AfterViewInit, OnChanges, OnDestroy {
     // (undocumented)
     _addHandle(handle: CdkDragHandle): void;
     boundaryElement: string | ElementRef<HTMLElement> | HTMLElement;
-    constrainPosition?: (userPointerPosition: Point, dragRef: DragRef, dimensions: DOMRect, pickupPositionInElement: Point) => Point;
+    constrainPosition?: DragConstrainPosition;
     data: T;
     get disabled(): boolean;
     set disabled(value: boolean);