pjs/widget/windows/nsNativeDragTarget.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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 Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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* ***** END LICENSE BLOCK ***** */
#ifndef _nsNativeDragTarget_h_
#define _nsNativeDragTarget_h_
#include "nsCOMPtr.h"
#include "nsIDragSession.h"
#include <ole2.h>
#include <shlobj.h>
#ifndef IDropTargetHelper
#include <shobjidl.h> // Vista drag image interfaces
#endif
class nsIDragService;
class nsIWidget;
struct IDataObject;
/*
* nsNativeDragTarget implements the IDropTarget interface and gets most of its
* behavior from the associated adapter (m_dragDrop).
*/
class nsNativeDragTarget : public IDropTarget
{
public:
nsNativeDragTarget(nsIWidget * aWnd);
~nsNativeDragTarget();
// IUnknown members - see iunknown.h for documentation
STDMETHODIMP QueryInterface(REFIID, void**);
STDMETHODIMP_(ULONG) AddRef();
STDMETHODIMP_(ULONG) Release();
// IDataTarget members
// Set pEffect based on whether this object can support a drop based on
// the data available from pSource, the key and mouse states specified
// in grfKeyState, and the coordinates specified by point. This is
// called by OLE when a drag enters this object's window (as registered
// by Initialize).
STDMETHODIMP DragEnter(LPDATAOBJECT pSource, DWORD grfKeyState,
POINTL point, DWORD* pEffect);
// Similar to DragEnter except it is called frequently while the drag
// is over this object's window.
STDMETHODIMP DragOver(DWORD grfKeyState, POINTL point, DWORD* pEffect);
// Release the drag-drop source and put internal state back to the point
// before the call to DragEnter. This is called when the drag leaves
// without a drop occurring.
STDMETHODIMP DragLeave();
// If point is within our region of interest and pSource's data supports
// one of our formats, get the data and set pEffect according to
// grfKeyState (DROPEFFECT_MOVE if the control key was not pressed,
// DROPEFFECT_COPY if the control key was pressed). Otherwise return
// E_FAIL.
STDMETHODIMP Drop(LPDATAOBJECT pSource, DWORD grfKeyState,
POINTL point, DWORD* pEffect);
/**
* Cancel the current drag session, if any.
*/
void DragCancel();
protected:
void GetGeckoDragAction(DWORD grfKeyState, LPDWORD pdwEffect,
PRUint32 * aGeckoAction);
void ProcessDrag(PRUint32 aEventType, DWORD grfKeyState,
POINTL pt, DWORD* pdwEffect);
void DispatchDragDropEvent(PRUint32 aType, POINTL pt);
void AddLinkSupportIfCanBeGenerated(LPDATAOBJECT aIDataSource);
// Native Stuff
ULONG m_cRef; // reference count
HWND mHWnd;
DWORD mEffectsAllowed;
DWORD mEffectsPreferred;
bool mTookOwnRef;
// Gecko Stuff
nsIWidget * mWindow;
nsIDragService * mDragService;
// Drag target helper
IDropTargetHelper * GetDropTargetHelper();
private:
// Drag target helper
IDropTargetHelper * mDropTargetHelper;
};
#endif // _nsNativeDragTarget_h_