Improves drag and drop for timed and all-day events

Refactors drag and drop handling to use a cloned event element,
ensuring correct positioning and styling during drag operations
for both regular timed events and all-day events.

This change streamlines the drag and drop process by:
- Creating a clone of the dragged event at the start of the drag.
- Passing the clone through the drag events.
- Handling all-day events with the AllDayManager
- Handling regular timed events with the EventRendererManager

This resolves issues with event positioning and styling during
drag, especially when moving events across columns or between
all-day and timed sections.

src/managers/AllDayManager.ts

@@ -65,7 +65,7 @@ export class AllDayManager {
 
     // Listen for drag operations on all-day events
     eventBus.on('drag:start', (event) => {
-      const { draggedElement, mouseOffset } = (event as CustomEvent<DragStartEventPayload>).detail;
+      const { draggedElement, draggedClone, mouseOffset } = (event as CustomEvent<DragStartEventPayload>).detail;
 
       // Check if this is an all-day event by checking if it's in all-day container
       const isAllDayEvent = draggedElement.closest('swp-allday-container');
@@ -77,26 +77,22 @@ export class AllDayManager {
     });
 
     eventBus.on('drag:column-change', (event) => {
-      const { draggedElement, mousePosition } = (event as CustomEvent<DragColumnChangeEventPayload>).detail;
+      const { draggedElement, draggedClone, mousePosition } = (event as CustomEvent<DragColumnChangeEventPayload>).detail;
      
+      if(draggedClone == null)
+        return;
 
-      // Check if there's an all-day clone for this event
-      const eventId = draggedElement.dataset.eventId;
-      const dragClone = document.querySelector(`swp-allday-container swp-event[data-event-id="clone-${eventId}"]`) as HTMLElement;
+      // Filter: Only handle events where clone IS an all-day event
+      if (!draggedClone.hasAttribute('data-allday')) {
+        return; // This is not an all-day event, let EventRendererManager handle it
+      }
+
+      console.log('🔄 AllDayManager: Handling drag:column-change for all-day event', {
+        eventId : draggedElement.dataset.eventId,
+        cloneId: draggedClone.dataset.eventId
+      });
       
-       if (!dragClone.hasAttribute('data-allday')) {
-        return; 
-      }
-
-
-      // If we find an all-day clone, handle the drag move
-      if (dragClone) {
-        console.log('🔄 AllDayManager: Found all-day clone, handling drag:column-change', {
-          eventId,
-          cloneId: dragClone.dataset.eventId
-        });
-        this.handleColumnChange(dragClone, mousePosition);
-      }
+      this.handleColumnChange(draggedClone, mousePosition);
     });
 
     eventBus.on('drag:end', (event) => {

src/managers/DragDropManager.ts

@@ -7,6 +7,7 @@ import { IEventBus } from '../types/CalendarTypes';
 import { calendarConfig } from '../core/CalendarConfig';
 import { PositionUtils } from '../utils/PositionUtils';
 import { ColumnDetectionUtils } from '../utils/ColumnDetectionUtils';
+import { SwpEventElement } from '../elements/SwpEventElement';
 import {
   DragStartEventPayload,
   DragMoveEventPayload,
@@ -40,6 +41,7 @@ export class DragDropManager {
 
   // Drag state
   private draggedElement!: HTMLElement | null;
+  private draggedClone!: HTMLElement | null;
   private currentColumn: string | null = null;
   private isDragStarted = false;
 
@@ -198,8 +200,17 @@ export class DragDropManager {
           // Start drag - emit drag:start event
           this.isDragStarted = true;
 
+           // Create SwpEventElement from existing DOM element and clone it
+              const originalSwpEvent = SwpEventElement.fromExistingElement(this.draggedElement);
+              const clonedSwpEvent = originalSwpEvent.createClone();
+          
+              // Get the cloned DOM element
+              this.draggedClone = clonedSwpEvent.getElement();
+
+              
           const dragStartPayload: DragStartEventPayload = {
             draggedElement: this.draggedElement,
+            draggedClone: this.draggedClone,
             mousePosition: this.initialMousePosition,
             mouseOffset: this.mouseOffset,
             column: this.currentColumn
@@ -244,6 +255,7 @@ export class DragDropManager {
 
           const dragColumnChangePayload: DragColumnChangeEventPayload = {
             draggedElement: this.draggedElement,
+            draggedClone: this.draggedClone,
             previousColumn,
             newColumn,
             mousePosition: currentPosition
@@ -514,6 +526,7 @@ export class DragDropManager {
    */
   private cleanupDragState(): void {
     this.draggedElement = null;
+    this.draggedClone = null;
     this.currentColumn = null;
     this.isDragStarted = false;
     this.isInHeader = false;

src/renderers/EventRenderer.ts

@@ -16,7 +16,7 @@ import { DragOffset, StackLinkData } from '../types/DragDropTypes';
 export interface EventRendererStrategy {
   renderEvents(events: CalendarEvent[], container: HTMLElement): void;
   clearEvents(container?: HTMLElement): void;
-  handleDragStart?(originalElement: HTMLElement, eventId: string, mouseOffset: DragOffset, column: string): void;
+  handleDragStart?(payload: import('../types/EventTypes').DragStartEventPayload): void;
   handleDragMove?(eventId: string, snappedY: number, column: string, mouseOffset: DragOffset): void;
   handleDragAutoScroll?(eventId: string, snappedY: number): void;
   handleDragEnd?(eventId: string, originalElement: HTMLElement, draggedClone: HTMLElement, finalColumn: string, finalY: number): void;
@@ -160,30 +160,31 @@ export abstract class BaseEventRenderer implements EventRendererStrategy {
   /**
    * Handle drag start event
    */
-  public handleDragStart(originalElement: HTMLElement, eventId: string, mouseOffset: DragOffset, column: string): void {
+  public handleDragStart(payload: import('../types/EventTypes').DragStartEventPayload): void {
+    const originalElement = payload.draggedElement;
+    const eventId = originalElement.dataset.eventId || '';
+    const mouseOffset = payload.mouseOffset;
+    const column = payload.column || '';
+    
     this.originalEvent = originalElement;
 
-    // Remove stacking styling during drag will be handled by new system
+    // Use the clone from the payload instead of creating a new one
+    this.draggedClone = payload.draggedClone;
 
-    // Create SwpEventElement from existing DOM element and clone it
-    const originalSwpEvent = SwpEventElement.fromExistingElement(originalElement);
-    const clonedSwpEvent = originalSwpEvent.createClone();
+    if (this.draggedClone) {
+      // Apply drag styling
+      this.applyDragStyling(this.draggedClone);
 
-    // Get the cloned DOM element
-    this.draggedClone = clonedSwpEvent.getElement();
-
-    // Apply drag styling
-    this.applyDragStyling(this.draggedClone);
-
-    // Add to current column's events layer (not directly to column)
-    const columnElement = document.querySelector(`swp-day-column[data-date="${column}"]`);
-    if (columnElement) {
-      const eventsLayer = columnElement.querySelector('swp-events-layer');
-      if (eventsLayer) {
-        eventsLayer.appendChild(this.draggedClone);
-      } else {
-        // Fallback to column if events layer not found
-        columnElement.appendChild(this.draggedClone);
+      // Add to current column's events layer (not directly to column)
+      const columnElement = document.querySelector(`swp-day-column[data-date="${column}"]`);
+      if (columnElement) {
+        const eventsLayer = columnElement.querySelector('swp-events-layer');
+        if (eventsLayer) {
+          eventsLayer.appendChild(this.draggedClone);
+        } else {
+          // Fallback to column if events layer not found
+          columnElement.appendChild(this.draggedClone);
+        }
       }
     }
 

src/renderers/EventRendererManager.ts

@@ -179,11 +179,10 @@ export class EventRenderingService {
     private setupDragEventListeners(): void {
         // Handle drag start
         this.eventBus.on('drag:start', (event: Event) => {
-            const { draggedElement, mouseOffset, column } = (event as CustomEvent<DragStartEventPayload>).detail;
+            const dragStartPayload = (event as CustomEvent<DragStartEventPayload>).detail;
             // Use the draggedElement directly - no need for DOM query
-            if (draggedElement && this.strategy.handleDragStart && column) {
-                const eventId = draggedElement.dataset.eventId || '';
-                this.strategy.handleDragStart(draggedElement, eventId, mouseOffset, column);
+            if (dragStartPayload.draggedElement && this.strategy.handleDragStart && dragStartPayload.column) {
+                this.strategy.handleDragStart(dragStartPayload);
             }
         });
 
@@ -246,10 +245,16 @@ export class EventRenderingService {
 
         // Handle column change
         this.eventBus.on('drag:column-change', (event: Event) => {
-            const { draggedElement, newColumn } = (event as CustomEvent<DragColumnChangeEventPayload>).detail;
+            const { draggedElement, draggedClone, newColumn } = (event as CustomEvent<DragColumnChangeEventPayload>).detail;
+            
+            // Filter: Only handle events where clone is NOT an all-day event (normal timed events)
+            if (draggedClone && draggedClone.hasAttribute('data-allday')) {
+                return; // This is an all-day event, let AllDayManager handle it
+            }
+            
             if (this.strategy.handleColumnChange) {
                 const eventId = draggedElement.dataset.eventId || '';
-                this.strategy.handleColumnChange(eventId, newColumn);
+                this.strategy.handleColumnChange(eventId, newColumn); //TODO: Should be refactored to use payload, no need to lookup clone again inside
             }
         });
 

src/types/EventTypes.ts

@@ -46,6 +46,7 @@ export interface MousePosition {
 // Drag start event payload
 export interface DragStartEventPayload {
   draggedElement: HTMLElement;
+  draggedClone: HTMLElement | null;
   mousePosition: MousePosition;
   mouseOffset: MousePosition;
   column: string | null;
@@ -90,6 +91,7 @@ export interface DragMouseLeaveHeaderEventPayload {
 // Drag column change event payload
 export interface DragColumnChangeEventPayload {
   draggedElement: HTMLElement;
+  draggedClone: HTMLElement | null;
   previousColumn: string | null;
   newColumn: string;
   mousePosition: MousePosition;