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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* 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/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 .
*/
#pragma once
#include <com/sun/star/lang/XInitialization.hpp>
#include <com/sun/star/datatransfer/dnd/XDropTarget.hpp>
#include <com/sun/star/datatransfer/dnd/DropTargetDragEnterEvent.hpp>
#include <com/sun/star/lang/XServiceInfo.hpp>
#include <cppuhelper/basemutex.hxx>
#include <cppuhelper/compbase.hxx>
#include <cppuhelper/interfacecontainer.hxx>
#include <osl/mutex.hxx>
#include <oleidl.h>
namespace com::sun::star::uno
{
class XComponentContext;
}
using namespace ::com::sun::star::lang;
using namespace ::com::sun::star::uno;
using namespace cppu;
using namespace osl;
using namespace ::com::sun::star::datatransfer;
using namespace ::com::sun::star::datatransfer::dnd;
// The client
// has to call XComponent::dispose. The thread that calls initialize
// must also execute the destruction of the instance. This is because
// initialize calls OleInitialize and the destructor calls OleUninitialize.
// If the service calls OleInitialize then it also calls OleUnitialize when
// it is destroyed. Therefore no second instance may exist which was
// created in the same thread and still needs OLE.
class DropTarget : public cppu::BaseMutex,
public WeakComponentImplHelper<XInitialization, XDropTarget, XServiceInfo>
{
private:
friend unsigned __stdcall DndTargetOleSTAFunc(void* pParams);
// The native window which acts as drop target.
// It is set in initialize. In case RegisterDragDrop fails it is set
// to NULL
HWND m_hWnd; // set by initialize
// Holds the thread id of the thread which created the window that is the
// drop target. Only used when DropTarget::initialize is called from an MTA
// thread
DWORD m_threadIdWindow;
// This is the thread id of the OLE thread that is created in DropTarget::initialize
// when the calling thread is an MTA
unsigned m_threadIdTarget;
// The handle of the thread that is created in DropTarget::initialize
// when the calling thread is an MTA
HANDLE m_hOleThread;
// The thread id of the thread which called initialize. When the service dies
// than m_oleThreadId is used to determine if the service successfully called
// OleInitialize. If so then OleUninitialize has to be called.
DWORD m_oleThreadId;
// An Instance of IDropTargetImpl which receives calls from the system's drag
// and drop implementation. It delegate the calls to name alike functions in
// this class.
IDropTarget* m_pDropTarget;
Reference<XComponentContext> m_xContext;
// If m_bActive == sal_True then events are fired to XDropTargetListener s,
// none otherwise. The default value is sal_True.
bool m_bActive;
sal_Int8 m_nDefaultActions;
// This value is set when a XDropTargetListener calls accept or reject on
// the XDropTargetDropContext or XDropTargetDragContext.
// The values are from the DNDConstants group.
sal_Int8 m_nCurrentDropAction;
// This value is manipulated by the XDropTargetListener
sal_Int8 m_nLastDropAction;
Reference<XTransferable> m_currentData;
// The current action is used to determine if the USER
// action has changed (dropActionChanged)
// sal_Int8 m_userAction;
// Set by listeners when they call XDropTargetDropContext::dropComplete
bool m_bDropComplete;
Reference<XDropTargetDragContext> m_currentDragContext;
Reference<XDropTargetDropContext> m_currentDropContext;
public:
explicit DropTarget(const Reference<XComponentContext>& rxContext);
virtual ~DropTarget() override;
DropTarget(DropTarget const&) = delete;
DropTarget& operator=(DropTarget const&) = delete;
// Overrides WeakComponentImplHelper::disposing which is called by
// WeakComponentImplHelper::dispose
// Must be called.
virtual void SAL_CALL disposing() override;
// XInitialization
virtual void SAL_CALL initialize(const Sequence<Any>& aArguments) override;
// XDropTarget
virtual void SAL_CALL addDropTargetListener(const Reference<XDropTargetListener>& dtl) override;
virtual void SAL_CALL
removeDropTargetListener(const Reference<XDropTargetListener>& dtl) override;
// Default is not active
virtual sal_Bool SAL_CALL isActive() override;
virtual void SAL_CALL setActive(sal_Bool isActive) override;
virtual sal_Int8 SAL_CALL getDefaultActions() override;
virtual void SAL_CALL setDefaultActions(sal_Int8 actions) override;
// XServiceInfo
virtual OUString SAL_CALL getImplementationName() override;
virtual sal_Bool SAL_CALL supportsService(const OUString& ServiceName) override;
virtual Sequence<OUString> SAL_CALL getSupportedServiceNames() override;
// Functions called from the IDropTarget implementation ( m_pDropTarget)
virtual HRESULT DragEnter(
/* [unique][in] */ IDataObject* pDataObj,
/* [in] */ DWORD grfKeyState,
/* [in] */ POINTL pt,
/* [out][in] */ DWORD* pdwEffect);
virtual HRESULT STDMETHODCALLTYPE DragOver(
/* [in] */ DWORD grfKeyState,
/* [in] */ POINTL pt,
/* [out][in] */ DWORD* pdwEffect);
virtual HRESULT STDMETHODCALLTYPE DragLeave();
virtual HRESULT STDMETHODCALLTYPE Drop(
/* [unique][in] */ IDataObject* pDataObj,
/* [in] */ DWORD grfKeyState,
/* [in] */ POINTL pt,
/* [out][in] */ DWORD* pdwEffect);
// Non - interface functions --------------------------------------------------
// XDropTargetDropContext delegated from DropContext
void _acceptDrop(sal_Int8 dropOperation, const Reference<XDropTargetDropContext>& context);
void _rejectDrop(const Reference<XDropTargetDropContext>& context);
void _dropComplete(bool success, const Reference<XDropTargetDropContext>& context);
// XDropTargetDragContext delegated from DragContext
void _acceptDrag(sal_Int8 dragOperation, const Reference<XDropTargetDragContext>& context);
void _rejectDrag(const Reference<XDropTargetDragContext>& context);
protected:
// Gets the current action dependent on the pressed modifiers, the effects
// supported by the drop source (IDropSource) and the default actions of the
// drop target (XDropTarget, this class))
inline sal_Int8 getFilteredActions(DWORD grfKeyState, DWORD sourceActions);
// Only filters with the default actions
inline sal_Int8 getFilteredActions(DWORD grfKeyState);
void fire_drop(const DropTargetDropEvent& dte);
void fire_dragEnter(const DropTargetDragEnterEvent& dtde);
void fire_dragExit(const DropTargetEvent& dte);
void fire_dragOver(const DropTargetDragEvent& dtde);
void fire_dropActionChanged(const DropTargetDragEvent& dtde);
};
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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