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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef _NSDATAOBJCOLLECTION_H_
#define _NSDATAOBJCOLLECTION_H_

#include <oleidl.h>

#include "mozilla/RefPtr.h"
#include "nsString.h"
#include "nsTArray.h"
#include "nsDataObj.h"
#include "mozilla/Attributes.h"

#define MULTI_MIME "Mozilla/IDataObjectCollectionFormat"

EXTERN_C const IID IID_IDataObjCollection;

// An interface to make sure we have the right kind of object for D&D
// this way we can filter out collection objects that aren't ours
class nsIDataObjCollection : public IUnknown {
 public:
};

/*
 * This ole registered class is used to facilitate drag-drop of objects which
 * can be adapted by an object derived from CfDragDrop. The CfDragDrop is
 * associated with instances via SetDragDrop().
 */

class nsDataObjCollection final : public nsIDataObjCollection,
                                  public nsDataObj {
 public:
  nsDataObjCollection();

 private:
  ~nsDataObjCollection() final;

 public:  // IUnknown methods - see iunknown.h for documentation
  STDMETHODIMP_(ULONG) AddRef() final;
  STDMETHODIMP QueryInterface(REFIID, void**) final;
  STDMETHODIMP_(ULONG) Release() final;

 private:  // DataGet and DataSet helper methods
  HRESULT GetFile(LPFORMATETC pFE, LPSTGMEDIUM pSTM);
  HRESULT GetText(LPFORMATETC pFE, LPSTGMEDIUM pSTM);
  HRESULT GetFileDescriptors(LPFORMATETC pFE, LPSTGMEDIUM pSTM);
  HRESULT GetFileContents(LPFORMATETC pFE, LPSTGMEDIUM pSTM);
  HRESULT GetFirstSupporting(LPFORMATETC pFE, LPSTGMEDIUM pSTM);

  using nsDataObj::GetFile;
  using nsDataObj::GetFileContents;
  using nsDataObj::GetText;

  // support for clipboard
  void AddDataFlavor(const char* aDataFlavor, LPFORMATETC aFE) final;

 public:  // from nsPIDataObjCollection
  void AddDataObject(IDataObject* aDataObj);
  int32_t GetNumDataObjects() { return mDataObjects.Length(); }
  nsDataObj* GetDataObjectAt(uint32_t aItem) {
    return mDataObjects.SafeElementAt(aItem, RefPtr<nsDataObj>());
  }

 public:
  // Store data in pSTM according to the format specified by pFE, if the
  // format is supported (supported formats are specified in CfDragDrop::
  // GetFormats) and return NOERROR; otherwise return DATA_E_FORMATETC. It
  // is the callers responsibility to free pSTM if NOERROR is returned.
  STDMETHODIMP GetData(LPFORMATETC pFE, LPSTGMEDIUM pSTM) final;

  // Similar to GetData except that the caller allocates the structure
  // referenced by pSTM.
  STDMETHODIMP GetDataHere(LPFORMATETC pFE, LPSTGMEDIUM pSTM) final;

  // Returns S_TRUE if this object supports the format specified by pSTM,
  // S_FALSE otherwise.
  STDMETHODIMP QueryGetData(LPFORMATETC pFE) final;

  // Set this objects data according to the format specified by pFE and
  // the storage medium specified by pSTM and return NOERROR, if the format
  // is supported. If release is TRUE this object must release the storage
  // associated with pSTM.
  STDMETHODIMP SetData(LPFORMATETC pFE, LPSTGMEDIUM pSTM, BOOL release) final;

 private:
  nsTArray<RefPtr<nsDataObj> > mDataObjects;
};

#endif  //