godot/platform/windows/drop_target_windows.h

/**************************************************************************/
/*  drop_target_windows.h                                                 */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#ifndef DROP_TARGET_WINDOWS_H
#define DROP_TARGET_WINDOWS_H

#include "display_server_windows.h"

#include <shlobj.h>

// Silence warning due to a COM API weirdness.
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
#endif

// https://learn.microsoft.com/en-us/windows/win32/api/ole2/nf-ole2-dodragdrop#remarks
class DropTargetWindows : public IDropTarget {
	LONG ref_count;
	DisplayServerWindows::WindowData *window_data = nullptr;
	CLIPFORMAT cf_filedescriptor = 0;
	CLIPFORMAT cf_filecontents = 0;
	String tmp_path;

	bool is_valid_filedescriptor();
	HRESULT handle_hdrop_format(Vector<String> *p_files, IDataObject *pDataObj);
	HRESULT handle_filedescriptor_format(Vector<String> *p_files, IDataObject *pDataObj);
	HRESULT save_as_file(const String &p_out_dir, FILEDESCRIPTORW *p_file_desc, IDataObject *pDataObj, int p_file_idx);

public:
	DropTargetWindows(DisplayServerWindows::WindowData *p_window_data);
	virtual ~DropTargetWindows() {}

	// IUnknown
	HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void **ppvObject) override;
	ULONG STDMETHODCALLTYPE AddRef() override;
	ULONG STDMETHODCALLTYPE Release() override;

	// IDropTarget
	HRESULT STDMETHODCALLTYPE DragEnter(IDataObject *pDataObj, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect) override;
	HRESULT STDMETHODCALLTYPE DragOver(DWORD grfKeyState, POINTL pt, DWORD *pdwEffect) override;
	HRESULT STDMETHODCALLTYPE DragLeave() override;
	HRESULT STDMETHODCALLTYPE Drop(IDataObject *pDataObj, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect) override;
};

#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic pop
#endif

#endif // DROP_TARGET_WINDOWS_H