PR: LIBRARY: Change onDragDropAllow options (#7370)

* work for the #7336

* work for the #7336

* Fix descriptions

---------

Co-authored-by: RomanTsukanov <sergeich16@gmail.com>

src/drag-drop-page-helper-v1.ts

@@ -84,7 +84,10 @@ export class DragDropPageHelperV1 {
       allow: true,
       target: this.dragDropInfo.target,
       source: this.dragDropInfo.source,
+      toElement: this.dragDropInfo.target,
+      draggedElement: this.dragDropInfo.source,
       parent: parent,
+      fromElement: this.dragDropInfo.source ? this.dragDropInfo.source.parent : null,
       insertAfter: insertAfter,
       insertBefore: insertBefore,
     };

src/survey-events-api.ts

@@ -1,6 +1,6 @@
 import { IAction } from "./actions/action";
 import { Base } from "./base";
-import { IElement, ISurveyElement, IValueItemCustomPropValues } from "./base-interfaces";
+import { IElement, IPanel, ISurveyElement, IValueItemCustomPropValues } from "./base-interfaces";
 import { ItemValue } from "./itemvalue";
 import { PageModel } from "./page";
 import { PanelModel, PanelModelBase } from "./panel";
@@ -841,27 +841,39 @@ export interface DragDropAllowEvent {
   /**
    * A survey element being dragged.
    */
-  target: IElement;
+  draggedElement: IElement;
   /**
-   * A survey element from which `target` is being dragged. This parameter is `null` if `target` is being dragged from the [Toolbox](https://surveyjs.io/survey-creator/documentation/toolbox).
+   * A survey element from which `draggedElement` is being dragged. This parameter is `null` if `draggedElement` is being dragged from the [Toolbox](https://surveyjs.io/survey-creator/documentation/toolbox).
    */
-  source: IElement;
+  fromElement: IPanel;
+  /**
+   * A survey element to which `draggedElement` is being dragged.
+   */
+  toElement: IElement;
   /**
    * A survey element before which the target element will be placed. This parameter is `null` if the parent container (page or panel) has no elements or if the target element will be placed below all other elements within the container.
    */
   insertBefore: IElement;
   /**
-   * A survey element after which `target` will be placed. This parameter is `null` if the parent container (page or panel) has no elements or if `target` will be placed above all other elements within the container.
+   * A survey element after which `draggedElement` will be placed. This parameter is `null` if the parent container (page or panel) has no elements or if `draggedElement` will be placed above all other elements within the container.
    */
   insertAfter: IElement;
   /**
-   * A parent container (page or panel) within which `target` will be placed.
+   * A parent container (page or panel) within which `draggedElement` will be placed.
    */
   parent: ISurveyElement;
   /**
    * A Boolean property that you can set to `false` if you want to cancel the drag and drop operation.
    */
   allow: boolean;
+  /**
+   * Obsolete. Use `options.draggedElement` instead.
+   */
+  target: IElement;
+  /**
+   * Obsolete. Use `options.toElement` instead.
+   */
+  source: IElement;
 }
 export interface ScrollingElementToTopEvent {
   /**