DragDropHandler.h

#pragma once
 
#include <EditorFramework/EditorFrameworkDLL.h>
#include <Foundation/Reflection/Reflection.h>
 
class plDragDropInfo;
class plDragDropConfig;
 
class PL_EDITORFRAMEWORK_DLL plDragDropHandler : public plReflectedClass
{
  PL_ADD_DYNAMIC_REFLECTION(plDragDropHandler, plReflectedClass);
 
public:
  static bool IsHandlerActive() { return s_pActiveDnD != nullptr; }
 
  static bool BeginDragDropOperation(const plDragDropInfo* pInfo, plDragDropConfig* pConfigToFillOut = nullptr);
 
  static void UpdateDragDropOperation(const plDragDropInfo* pInfo);
 
  static void FinishDragDrop(const plDragDropInfo* pInfo);
 
  static void CancelDragDrop();
 
 
  static bool CanDropOnly(const plDragDropInfo* pInfo);
 
  static bool DropOnly(const plDragDropInfo* pInfo);
 
public:
  plDragDropHandler();
 
 
protected:
  virtual float CanHandle(const plDragDropInfo* pInfo) const = 0;
 
  virtual void RequestConfiguration(plDragDropConfig* pConfigToFillOut) {}
 
  virtual void OnDragBegin(const plDragDropInfo* pInfo) = 0;
 
  virtual void OnDragUpdate(const plDragDropInfo* pInfo) = 0;
 
  virtual void OnDragCancel() = 0;
 
  virtual void OnDrop(const plDragDropInfo* pInfo) = 0;
 
private:
  static plDragDropHandler* FindDragDropHandler(const plDragDropInfo* pInfo);
 
  static plDragDropHandler* s_pActiveDnD;
};