/* -*- 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 _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 #undef LogSeverity // SetupAPI.h #defines this as DWORD #endif #include "mozilla/Attributes.h" #include "mozilla/EventForwards.h" class nsIDragService; class nsIWidget; /* * nsNativeDragTarget implements the IDropTarget interface and gets most of its * behavior from the associated adapter (m_dragDrop). */ class nsNativeDragTarget final : public IDropTarget { public: nsNativeDragTarget(nsIWidget * aWidget); ~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, uint32_t * aGeckoAction); void ProcessDrag(mozilla::EventMessage aEventMessage, DWORD grfKeyState, POINTL pt, DWORD* pdwEffect); void DispatchDragDropEvent(mozilla::EventMessage aEventMessage, const POINTL& aPT); void AddLinkSupportIfCanBeGenerated(LPDATAOBJECT aIDataSource); // Native Stuff ULONG m_cRef; // reference count HWND mHWnd; DWORD mEffectsAllowed; DWORD mEffectsPreferred; bool mTookOwnRef; // Gecko Stuff nsIWidget * mWidget; nsIDragService * mDragService; // Drag target helper IDropTargetHelper * GetDropTargetHelper(); private: // Drag target helper IDropTargetHelper * mDropTargetHelper; }; #endif // _nsNativeDragTarget_h_