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/* -*- 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 <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:
explicit 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.
MOZ_CAN_RUN_SCRIPT_BOUNDARY 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.
MOZ_CAN_RUN_SCRIPT_BOUNDARY 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.
MOZ_CAN_RUN_SCRIPT_BOUNDARY STDMETHODIMP Drop(LPDATAOBJECT pSource,
DWORD grfKeyState, POINTL point,
DWORD* pEffect);
/**
* Cancel the current drag session, if any.
*/
MOZ_CAN_RUN_SCRIPT_BOUNDARY void DragCancel();
static void DragImageChanged() { gDragImageChanged = true; }
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;
static bool gDragImageChanged;
};
#endif // _nsNativeDragTarget_h_