Used the new FactoryCreateFile method for drag & drop factory.

Author: gmpreussner

Source/TextAssetEditor/Private/Factories/TextAssetFactory.cpp

@@ -23,6 +23,7 @@ UTextAssetFactory::UTextAssetFactory( const FObjectInitializer& ObjectInitialize
 /* UFactory overrides
  *****************************************************************************/
 
+/* This is the old API (only for demonstration purposes)
 UObject* UTextAssetFactory::FactoryCreateBinary(UClass* Class, UObject* InParent, FName Name, EObjectFlags Flags, UObject* Context, const TCHAR* Type, const uint8*& Buffer, const uint8* BufferEnd, FFeedbackContext* Warn)
 {
 	UTextAsset* TextAsset = nullptr;
@@ -34,5 +35,22 @@ UObject* UTextAssetFactory::FactoryCreateBinary(UClass* Class, UObject* InParent
 		TextAsset->Text = FText::FromString(TextString);
 	}
 
+	return TextAsset;
+}*/
+
+
+UObject* UTextAssetFactory::FactoryCreateFile(UClass* InClass, UObject* InParent, FName InName, EObjectFlags Flags, const FString& Filename, const TCHAR* Parms, FFeedbackContext* Warn, bool& bOutOperationCanceled)
+{
+	UTextAsset* TextAsset = nullptr;
+	FString TextString;
+
+	if (FFileHelper::LoadFileToString(TextString, *Filename))
+	{
+		TextAsset = NewObject<UTextAsset>(InParent, InClass, InName, Flags);
+		TextAsset->Text = FText::FromString(TextString);
+	}
+
+	bOutOperationCanceled = false;
+
 	return TextAsset;
 }

Source/TextAssetEditor/Private/Factories/TextAssetFactory.h

@@ -21,5 +21,6 @@ class UTextAssetFactory
 
 	//~ UFactory Interface
 
-	virtual UObject* FactoryCreateBinary(UClass* Class, UObject* InParent, FName Name, EObjectFlags Flags, UObject* Context, const TCHAR* Type, const uint8*& Buffer, const uint8* BufferEnd, FFeedbackContext* Warn) override;
+//	virtual UObject* FactoryCreateBinary(UClass* Class, UObject* InParent, FName Name, EObjectFlags Flags, UObject* Context, const TCHAR* Type, const uint8*& Buffer, const uint8* BufferEnd, FFeedbackContext* Warn) override;
+	virtual UObject* FactoryCreateFile(UClass* InClass, UObject* InParent, FName InName, EObjectFlags Flags, const FString& Filename, const TCHAR* Parms, FFeedbackContext* Warn, bool& bOutOperationCanceled) override;
 };