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102 lines
3.2 KiB
C++
102 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef _nsNativeDragTarget_h_
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#define _nsNativeDragTarget_h_
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#include "nsCOMPtr.h"
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#include "nsIDragSession.h"
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#include <ole2.h>
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#include <shlobj.h>
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#ifndef IDropTargetHelper
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#include <shobjidl.h> // Vista drag image interfaces
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#endif
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#include "mozilla/Attributes.h"
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class nsIDragService;
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class nsIWidget;
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struct IDataObject;
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/*
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* nsNativeDragTarget implements the IDropTarget interface and gets most of its
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* behavior from the associated adapter (m_dragDrop).
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*/
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class nsNativeDragTarget MOZ_FINAL : public IDropTarget
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{
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public:
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nsNativeDragTarget(nsIWidget * aWnd);
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~nsNativeDragTarget();
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// IUnknown members - see iunknown.h for documentation
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STDMETHODIMP QueryInterface(REFIID, void**);
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STDMETHODIMP_(ULONG) AddRef();
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STDMETHODIMP_(ULONG) Release();
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// IDataTarget members
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// Set pEffect based on whether this object can support a drop based on
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// the data available from pSource, the key and mouse states specified
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// in grfKeyState, and the coordinates specified by point. This is
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// called by OLE when a drag enters this object's window (as registered
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// by Initialize).
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STDMETHODIMP DragEnter(LPDATAOBJECT pSource, DWORD grfKeyState,
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POINTL point, DWORD* pEffect);
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// Similar to DragEnter except it is called frequently while the drag
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// is over this object's window.
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STDMETHODIMP DragOver(DWORD grfKeyState, POINTL point, DWORD* pEffect);
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// Release the drag-drop source and put internal state back to the point
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// before the call to DragEnter. This is called when the drag leaves
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// without a drop occurring.
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STDMETHODIMP DragLeave();
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// If point is within our region of interest and pSource's data supports
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// one of our formats, get the data and set pEffect according to
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// grfKeyState (DROPEFFECT_MOVE if the control key was not pressed,
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// DROPEFFECT_COPY if the control key was pressed). Otherwise return
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// E_FAIL.
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STDMETHODIMP Drop(LPDATAOBJECT pSource, DWORD grfKeyState,
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POINTL point, DWORD* pEffect);
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/**
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* Cancel the current drag session, if any.
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*/
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void DragCancel();
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protected:
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void GetGeckoDragAction(DWORD grfKeyState, LPDWORD pdwEffect,
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PRUint32 * aGeckoAction);
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void ProcessDrag(PRUint32 aEventType, DWORD grfKeyState,
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POINTL pt, DWORD* pdwEffect);
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void DispatchDragDropEvent(PRUint32 aType, POINTL pt);
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void AddLinkSupportIfCanBeGenerated(LPDATAOBJECT aIDataSource);
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// Native Stuff
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ULONG m_cRef; // reference count
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HWND mHWnd;
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DWORD mEffectsAllowed;
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DWORD mEffectsPreferred;
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bool mTookOwnRef;
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// Gecko Stuff
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nsIWidget * mWindow;
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nsIDragService * mDragService;
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// Drag target helper
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IDropTargetHelper * GetDropTargetHelper();
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private:
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// Drag target helper
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IDropTargetHelper * mDropTargetHelper;
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};
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#endif // _nsNativeDragTarget_h_
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