From 19c970db1774c7fa9e22ad75dc88523b3d44ae14 Mon Sep 17 00:00:00 2001
From: Aleksey Novikov <novikov82@gmail.com>
Date: Thu, 10 Oct 2024 10:07:46 +0300
Subject: [PATCH] #5925 - add new event

---
 .../survey-creator-core/src/creator-base.ts   |  3 ++
 .../survey-creator-core/src/entries/index.ts  |  1 +
 .../src/survey-elements.ts                    | 34 +++++++++++--------
 3 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/packages/survey-creator-core/src/creator-base.ts b/packages/survey-creator-core/src/creator-base.ts
index 2010a22100..28e67a7b5a 100644
--- a/packages/survey-creator-core/src/creator-base.ts
+++ b/packages/survey-creator-core/src/creator-base.ts
@@ -771,6 +771,8 @@ export class SurveyCreatorModel extends Base
    */
   public onDragDropAllow: EventBase<SurveyCreatorModel, DragDropAllowEvent> = this.addCreatorEvent<SurveyCreatorModel, DragDropAllowEvent>();
 
+  public onDragOverLocationCalculating: EventBase<SurveyCreatorModel, any> = this.addCreatorEvent<SurveyCreatorModel, any>();
+
   /**
    * An event that allows you to create a custom message panel.
    * 
@@ -1909,6 +1911,7 @@ export class SurveyCreatorModel extends Base
       settings.dragDrop.restrictDragQuestionBetweenPages;
     this.dragDropSurveyElements = new DragDropSurveyElements(null, this);
     this.dragDropSurveyElements.onGetMaxNestedPanels = (): number => { return this.maxNestedPanels; };
+    this.dragDropSurveyElements.onDragOverLocationCalculating = (options) => { this.onDragOverLocationCalculating.fire(this, options); };
     let isDraggedFromToolbox = false;
     this.dragDropSurveyElements.onDragStart.add((sender, options) => {
       isDraggedFromToolbox = !sender.draggedElement.parent;
diff --git a/packages/survey-creator-core/src/entries/index.ts b/packages/survey-creator-core/src/entries/index.ts
index 6a21f5a81c..00642db300 100644
--- a/packages/survey-creator-core/src/entries/index.ts
+++ b/packages/survey-creator-core/src/entries/index.ts
@@ -100,6 +100,7 @@ export * from "../presets/presets";
 export * from "../presets/presets-properties";
 export * from "../presets/presets-tabs";
 export * from "../presets/presets-toolbox";
+export * from "../survey-elements";
 
 require("../components/property-panel/property-panel-item.scss");
 require("../components/property-panel/property-panel.scss");
diff --git a/packages/survey-creator-core/src/survey-elements.ts b/packages/survey-creator-core/src/survey-elements.ts
index 36f7564124..013a36639f 100644
--- a/packages/survey-creator-core/src/survey-elements.ts
+++ b/packages/survey-creator-core/src/survey-elements.ts
@@ -65,6 +65,7 @@ export class DragDropSurveyElements extends DragDropCore<any> {
   }
   protected isDraggedElementSelected: boolean = false;
   public onGetMaxNestedPanels: () => number;
+  public onDragOverLocationCalculating: (options: any) => void;
   public get maxNestedPanels(): number { return this.onGetMaxNestedPanels ? this.onGetMaxNestedPanels() : -1; }
 
   // private isRight: boolean;
@@ -306,7 +307,7 @@ export class DragDropSurveyElements extends DragDropCore<any> {
     }
     return allowOptions.allow;
   }
-  public dragOverCore(dropTarget: ISurveyElement, dragOverLocation: DragTypeOverMeEnum, dragOverLocationIfNotAllowed: DragTypeOverMeEnum): void {
+  public dragOverCore(dropTarget: ISurveyElement, dragOverLocation: DragTypeOverMeEnum): void {
     const oldDragOverIndicatorElement = this.dragOverIndicatorElement;
     const oldDropTarget = this.dropTarget;
     if (this.isSameElement(dropTarget)) {
@@ -320,17 +321,8 @@ export class DragDropSurveyElements extends DragDropCore<any> {
       ? this.dropTarget
       : ((<any>this.dropTarget).page || (<any>this.dropTarget).__page);
     if (!this.isAllowDragOver(dropTarget, dragOverLocation)) {
-      if (dragOverLocation != DragTypeOverMeEnum.InsideEmptyPanel) {
-        this.allowDropHere = false;
-        return;
-      }
-      dragOverLocation = dragOverLocationIfNotAllowed;
-      this.dragOverLocation = dragOverLocation;
-      this.insideContainer = false;
-      if (!this.isAllowDragOver(dropTarget, dragOverLocation)) {
-        this.allowDropHere = false;
-        return;
-      }
+      this.allowDropHere = false;
+      return;
     }
     if (dragOverLocation == DragTypeOverMeEnum.InsideEmptyPanel) {
       this.dragOverIndicatorElement = this.dropTarget;
@@ -371,13 +363,25 @@ export class DragDropSurveyElements extends DragDropCore<any> {
     const dropTarget = this.getDropTargetByNode(dropTargetNode, event);
 
     if (!!oldInsideContainer != !!this.insideContainer) dropTarget.dragTypeOverMe = null;
-    const dragOverLocationSide = calculateDragOverLocation(event.clientX, event.clientY, dropTargetNode);
-    let dragOverLocation = dragOverLocationSide;
+    let dragOverLocation = calculateDragOverLocation(event.clientX, event.clientY, dropTargetNode);
     if (dropTarget && ((dropTarget.isPanel || dropTarget.isPage) && dropTarget.elements.length === 0 || isPanelDynamic(dropTarget) && dropTarget.template.elements.length == 0)) {
       if (dropTarget.isPage || this.insideContainer) {
         dragOverLocation = DragTypeOverMeEnum.InsideEmptyPanel;
       }
     }
+    const options = {
+      survey: this.survey,
+      draggedSurveyElement: this.draggedElement,
+      dragOverSurveyElement: dropTarget,
+      clientX: event.clientX,
+      clientY: event.clientY,
+      dragOverHtmlElement: dropTargetNode,
+      dragOverLocation
+    };
+    if (this.onDragOverLocationCalculating) {
+      this.onDragOverLocationCalculating(options);
+      dragOverLocation = options.dragOverLocation;
+    }
     const isDropTargetValid = this.isDropTargetValid(
       dropTarget,
       dropTargetNode,
@@ -391,7 +395,7 @@ export class DragDropSurveyElements extends DragDropCore<any> {
 
     this.allowDropHere = true;
 
-    this.dragOverCore(dropTarget, dragOverLocation, dragOverLocationSide);
+    this.dragOverCore(dropTarget, dragOverLocation);
   }
 
   protected onStartDrag(): void {