/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim:expandtab:shiftwidth=4:tabstop=4:
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/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is Christopher Blizzard
 * <blizzard@mozilla.org>.  Portions created by Christopher Blizzard
 * are Copyright (C) 1998 Christopher Blizzard. All Rights Reserved.
 *
 * Contributor(s):
 * Christopher Blizzard <blizzard@mozilla.org>
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef nsDragService_h__
#define nsDragService_h__

#include "nsBaseDragService.h"
#include "nsIDragSessionGTK.h"
#include "nsIObserver.h"
#include <gtk/gtk.h>


/**
 * Native GTK DragService wrapper
 */

class nsDragService : public nsBaseDragService,
                      public nsIDragSessionGTK,
                      public nsIObserver
{
public:
    nsDragService();
    virtual ~nsDragService();

    NS_DECL_ISUPPORTS_INHERITED

    NS_DECL_NSIOBSERVER

    // nsIDragService
    NS_IMETHOD InvokeDragSession (nsIDOMNode *aDOMNode,
                                  nsISupportsArray * anArrayTransferables,
                                  nsIScriptableRegion * aRegion,
                                  PRUint32 aActionType);
    NS_IMETHOD StartDragSession();
    NS_IMETHOD EndDragSession();

    // nsIDragSession
    NS_IMETHOD SetCanDrop            (PRBool           aCanDrop);
    NS_IMETHOD GetCanDrop            (PRBool          *aCanDrop);
    NS_IMETHOD GetNumDropItems       (PRUint32 * aNumItems);
    NS_IMETHOD GetData               (nsITransferable * aTransferable,
                                      PRUint32 aItemIndex);
    NS_IMETHOD IsDataFlavorSupported (const char *aDataFlavor, PRBool *_retval);

    // nsIDragSessionGTK

    NS_IMETHOD TargetSetLastContext  (GtkWidget      *aWidget,
                                      GdkDragContext *aContext,
                                      guint           aTime);
    NS_IMETHOD TargetStartDragMotion (void);
    NS_IMETHOD TargetEndDragMotion   (GtkWidget      *aWidget,
                                      GdkDragContext *aContext,
                                      guint           aTime);
    NS_IMETHOD TargetDataReceived    (GtkWidget         *aWidget,
                                      GdkDragContext    *aContext,
                                      gint               aX,
                                      gint               aY,
                                      GtkSelectionData  *aSelection_data,
                                      guint              aInfo,
                                      guint32            aTime);

    NS_IMETHOD TargetSetTimeCallback (nsIDragSessionGTKTimeCB aCallback);

    // This is called when the drag started with the invisible widget
    // finishes.  It's called from within the drag service code but from
    // a callback - it needs to be public.
    void           SourceEndDrag(void);
    void           SourceDataGet(GtkWidget        *widget,
                                 GdkDragContext   *context,
                                 GtkSelectionData *selection_data,
                                 guint             info,
                                 guint32           aTime);

    //  END PUBLIC API

private:

    // target side vars

    // the last widget that was the target of a drag
    GtkWidget      *mTargetWidget;
    GdkDragContext *mTargetDragContext;
    guint           mTargetTime;
    // is it OK to drop on us?
    PRBool          mCanDrop;
    // have we received our drag data?
    PRBool          mTargetDragDataReceived;
    // last data received and its length
    void           *mTargetDragData;
    PRUint32        mTargetDragDataLen;
    // is the current target drag context contain a list?
    PRBool         IsTargetContextList(void);
    // this will get the native data from the last target given a
    // specific flavor
    void           GetTargetDragData(GdkAtom aFlavor);
    // this will reset all of the target vars
    void           TargetResetData(void);

    // source side vars

    // the source of our drags
    GtkWidget     *mHiddenWidget;
    // our source data items
    nsCOMPtr<nsISupportsArray> mSourceDataItems;
    // get a list of the sources in gtk's format
    GtkTargetList *GetSourceList(void);

};

#endif // nsDragService_h__