michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: #ifndef _nsNativeDragTarget_h_
michael@0: #define _nsNativeDragTarget_h_
michael@0: 
michael@0: #include "nsCOMPtr.h"
michael@0: #include "nsIDragSession.h"
michael@0: #include <ole2.h>
michael@0: #include <shlobj.h>
michael@0: 
michael@0: #ifndef IDropTargetHelper
michael@0: #include <shobjidl.h> // Vista drag image interfaces
michael@0: #undef LogSeverity // SetupAPI.h #defines this as DWORD
michael@0: #endif
michael@0: 
michael@0: #include "mozilla/Attributes.h"
michael@0: 
michael@0: class nsIDragService;
michael@0: class nsIWidget;
michael@0: 
michael@0: struct IDataObject;
michael@0: 
michael@0: /*
michael@0:  * nsNativeDragTarget implements the IDropTarget interface and gets most of its
michael@0:  * behavior from the associated adapter (m_dragDrop).
michael@0:  */
michael@0: 
michael@0: class nsNativeDragTarget MOZ_FINAL : public IDropTarget
michael@0: {
michael@0: public:
michael@0:   nsNativeDragTarget(nsIWidget * aWidget);
michael@0:   ~nsNativeDragTarget();
michael@0: 
michael@0:   // IUnknown members - see iunknown.h for documentation
michael@0:   STDMETHODIMP QueryInterface(REFIID, void**);
michael@0:   STDMETHODIMP_(ULONG) AddRef();
michael@0:   STDMETHODIMP_(ULONG) Release();
michael@0: 
michael@0:   // IDataTarget members
michael@0: 
michael@0:   // Set pEffect based on whether this object can support a drop based on
michael@0:   // the data available from pSource, the key and mouse states specified
michael@0:   // in grfKeyState, and the coordinates specified by point. This is
michael@0:   // called by OLE when a drag enters this object's window (as registered
michael@0:   // by Initialize).
michael@0:   STDMETHODIMP DragEnter(LPDATAOBJECT pSource, DWORD grfKeyState,
michael@0:                          POINTL point, DWORD* pEffect);
michael@0: 
michael@0:   // Similar to DragEnter except it is called frequently while the drag
michael@0:   // is over this object's window.
michael@0:   STDMETHODIMP DragOver(DWORD grfKeyState, POINTL point, DWORD* pEffect);
michael@0: 
michael@0:   // Release the drag-drop source and put internal state back to the point
michael@0:   // before the call to DragEnter. This is called when the drag leaves
michael@0:   // without a drop occurring.
michael@0:   STDMETHODIMP DragLeave();
michael@0: 
michael@0:   // If point is within our region of interest and pSource's data supports
michael@0:   // one of our formats, get the data and set pEffect according to
michael@0:   // grfKeyState (DROPEFFECT_MOVE if the control key was not pressed,
michael@0:   // DROPEFFECT_COPY if the control key was pressed). Otherwise return
michael@0:   // E_FAIL.
michael@0:   STDMETHODIMP Drop(LPDATAOBJECT pSource, DWORD grfKeyState,
michael@0:                     POINTL point, DWORD* pEffect);
michael@0:   /**
michael@0:    * Cancel the current drag session, if any.
michael@0:    */
michael@0:   void DragCancel();
michael@0: 
michael@0: protected:
michael@0: 
michael@0:   void GetGeckoDragAction(DWORD grfKeyState, LPDWORD pdwEffect, 
michael@0:                           uint32_t * aGeckoAction);
michael@0:   void ProcessDrag(uint32_t aEventType, DWORD grfKeyState,
michael@0:                    POINTL pt, DWORD* pdwEffect);
michael@0:   void DispatchDragDropEvent(uint32_t aType, POINTL pt);
michael@0:   void AddLinkSupportIfCanBeGenerated(LPDATAOBJECT aIDataSource);
michael@0: 
michael@0:   // Native Stuff
michael@0:   ULONG            m_cRef;      // reference count
michael@0:   HWND             mHWnd;
michael@0:   DWORD            mEffectsAllowed;
michael@0:   DWORD            mEffectsPreferred;
michael@0:   bool             mTookOwnRef;
michael@0: 
michael@0:   // Gecko Stuff
michael@0:   nsIWidget      * mWidget;
michael@0:   nsIDragService * mDragService;
michael@0:   // Drag target helper 
michael@0:   IDropTargetHelper * GetDropTargetHelper();
michael@0: 
michael@0: 
michael@0: private:
michael@0:   // Drag target helper 
michael@0:   IDropTargetHelper * mDropTargetHelper;
michael@0: };
michael@0: 
michael@0: #endif // _nsNativeDragTarget_h_
michael@0: 
michael@0: