win32/dnd/source.cxx

/**************************************************************
 *
 * 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
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 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
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 *************************************************************/


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_dtrans.hxx"
#include <com/sun/star/datatransfer/dnd/DNDConstants.hpp>
#include <com/sun/star/datatransfer/XTransferable.hpp>
#include <com/sun/star/awt/MouseButton.hpp>
#include <com/sun/star/awt/MouseEvent.hpp>
#include <rtl/unload.h>

#include <process.h>
#include <memory>

#include "source.hxx"
#include "globals.hxx"
#include "sourcecontext.hxx"
#include "../../inc/DtObjFactory.hxx"
#include <rtl/ustring.h>
#include <process.h>
#include <winuser.h>
#include <stdio.h>

#ifdef __MINGW32__
#define __uuidof(I) IID_##I
#endif

using namespace rtl;
using namespace cppu;
using namespace osl;
using namespace com::sun::star::datatransfer;
using namespace com::sun::star::datatransfer::dnd;
using namespace com::sun::star::datatransfer::dnd::DNDConstants;
using namespace com::sun::star::uno;
using namespace com::sun::star::awt::MouseButton;
using namespace com::sun::star::awt;
using namespace com::sun::star::lang;

extern rtl_StandardModuleCount g_moduleCount;

//--> TRA

extern Reference< XTransferable > g_XTransferable;

//<-- TRA

unsigned __stdcall DndOleSTAFunc(LPVOID pParams);

//----------------------------------------------------
/** Ctor
*/
DragSource::DragSource( const Reference<XMultiServiceFactory>& sf):
	m_serviceFactory( sf),
	WeakComponentImplHelper3< XDragSource, XInitialization, XServiceInfo >(m_mutex),
//	m_pcurrentContext_impl(0),
	m_hAppWindow(0),
	m_MouseButton(0),
	m_RunningDndOperationCount(0)
{
	g_moduleCount.modCnt.acquire( &g_moduleCount.modCnt );
}

//----------------------------------------------------
/** Dtor
*/
DragSource::~DragSource()
{
	g_moduleCount.modCnt.release( &g_moduleCount.modCnt );
}

//----------------------------------------------------
/** First start a new drag and drop thread if
	the last one has finished

	????
		Do we really need a separate thread for
		every Dnd operation or only if the source
		thread is an MTA thread
	????
*/
void DragSource::StartDragImpl(
	const DragGestureEvent& trigger,
	sal_Int8 sourceActions,
	sal_Int32 /*cursor*/,
	sal_Int32 /*image*/,
	const Reference<XTransferable >& trans,
	const Reference<XDragSourceListener >& listener )
{
	// The actions supported by the drag source
	m_sourceActions= sourceActions;
	// We need to know which mouse button triggered the operation.
	// If it was the left one, then the drop occurs when that button
	// has been released and if it was the right one then the drop
	// occurs when the right button has been released. If the event is not
	// set then we assume that the left button is pressed.
	MouseEvent evtMouse;
	trigger.Event >>= evtMouse;
	m_MouseButton= evtMouse.Buttons;

	// The SourceContext class administers the XDragSourceListener s and
	// fires events to them. An instance only exists in the scope of this
	// functions. However, the drag and drop operation causes callbacks
	// to the IDropSource interface implemented in this class (but only
	// while this function executes). The source context is also used
	// in DragSource::QueryContinueDrag.
	m_currentContext= static_cast<XDragSourceContext*>( new SourceContext(
					  static_cast<DragSource*>(this), listener ) );

	// Convert the XTransferable data object into an IDataObject object;

	//--> TRA
	g_XTransferable = trans;
	//<-- TRA

	m_spDataObject= m_aDataConverter.createDataObjFromTransferable(
                    m_serviceFactory, trans);

	// Obtain the id of the thread that created the window
	DWORD processId;
	m_threadIdWindow= GetWindowThreadProcessId( m_hAppWindow, &processId);

	// hold the instance for the DnD thread, it's to late
	// to acquire at the start of the thread procedure
	// the thread procedure is responsible for the release
	acquire();

	// The thread accesses members of this instance but does not call acquire.
	// Hopefully this instance is not destroyed before the thread has terminated.
	unsigned threadId;
	HANDLE hThread= reinterpret_cast<HANDLE>(_beginthreadex(
		0, 0, DndOleSTAFunc, reinterpret_cast<void*>(this), 0, &threadId));

	// detach from thread
	CloseHandle(hThread);
}

// XInitialization

//----------------------------------------------------
/** aArguments contains a machine id
*/
void SAL_CALL DragSource::initialize( const Sequence< Any >& aArguments )
	throw(Exception, RuntimeException)
{
	if( aArguments.getLength() >=2)
		m_hAppWindow= *(HWND*)aArguments[1].getValue();
	OSL_ASSERT( IsWindow( m_hAppWindow) );
}

//----------------------------------------------------
/** XDragSource
*/
sal_Bool SAL_CALL DragSource::isDragImageSupported(  )
		 throw(RuntimeException)
{
	return 0;
}

//----------------------------------------------------
/**
*/
sal_Int32 SAL_CALL DragSource::getDefaultCursor( sal_Int8 /*dragAction*/ )
		  throw( IllegalArgumentException, RuntimeException)
{
	return 0;
}

//----------------------------------------------------
/** Notifies the XDragSourceListener by
	calling dragDropEnd
*/
void SAL_CALL DragSource::startDrag(
	const DragGestureEvent& trigger,
	sal_Int8 sourceActions,
	sal_Int32 cursor,
	sal_Int32 image,
	const Reference<XTransferable >& trans,
	const Reference<XDragSourceListener >& listener ) throw( RuntimeException)
{
	// Allow only one running dnd operation at a time,
	// see XDragSource documentation

	long cnt = InterlockedIncrement(&m_RunningDndOperationCount);

	if (1 == cnt)
	{
		StartDragImpl(trigger, sourceActions, cursor, image, trans, listener);
	}
	else
	{
		//OSL_ENSURE(false, "Overlapping Drag&Drop operation rejected!");

		cnt = InterlockedDecrement(&m_RunningDndOperationCount);

		DragSourceDropEvent dsde;

		dsde.DropAction	 = ACTION_NONE;
		dsde.DropSuccess = false;

		try
		{
			listener->dragDropEnd(dsde);
		}
		catch(RuntimeException&)
		{
			OSL_ENSURE(false, "Runtime exception during event dispatching");
		}
	}
}

//----------------------------------------------------
/**IDropTarget
*/
HRESULT STDMETHODCALLTYPE DragSource::QueryInterface( REFIID riid, void **ppvObject)
{
	if( !ppvObject)
		return E_POINTER;
	*ppvObject= NULL;

	if( riid == __uuidof( IUnknown) )
		*ppvObject= static_cast<IUnknown*>( this);
	else if ( riid == __uuidof( IDropSource) )
		*ppvObject= static_cast<IDropSource*>( this);

	if(*ppvObject)
	{
		AddRef();
		return S_OK;
	}
	else
		return E_NOINTERFACE;

}

//----------------------------------------------------
/**
*/
ULONG STDMETHODCALLTYPE DragSource::AddRef( void)
{
	acquire();
	return (ULONG) m_refCount;
}

//----------------------------------------------------
/**
*/
ULONG STDMETHODCALLTYPE DragSource::Release( void)
{
	ULONG ref= m_refCount;
	release();
	return --ref;
}

//----------------------------------------------------
/** IDropSource
*/
HRESULT STDMETHODCALLTYPE DragSource::QueryContinueDrag(
/* [in] */ BOOL fEscapePressed,
/* [in] */ DWORD grfKeyState)
{
#if defined DBG_CONSOLE_OUT
	printf("\nDragSource::QueryContinueDrag");
#endif

	HRESULT retVal= S_OK; // default continue DnD

	if (fEscapePressed)
	{
		retVal= DRAGDROP_S_CANCEL;
	}
	else
	{
		if( ( m_MouseButton == MouseButton::RIGHT &&  !(grfKeyState & MK_RBUTTON) ) ||
			( m_MouseButton == MouseButton::MIDDLE && !(grfKeyState & MK_MBUTTON) ) ||
			( m_MouseButton == MouseButton::LEFT && !(grfKeyState & MK_LBUTTON)	)   ||
			( m_MouseButton == 0 && !(grfKeyState & MK_LBUTTON) ) )
		{
			retVal= DRAGDROP_S_DROP;
		}
	}

	// fire dropActionChanged event.
	// this is actually done by the context, which also detects whether the action
	// changed at all
	sal_Int8 dropAction= fEscapePressed ? ACTION_NONE :
                                                         dndOleKeysToAction( grfKeyState, m_sourceActions);

	sal_Int8 userAction= fEscapePressed ? ACTION_NONE :
                                                         dndOleKeysToAction( grfKeyState, -1 );

	static_cast<SourceContext*>(m_currentContext.get())->fire_dropActionChanged(
        dropAction, userAction);

	return retVal;
}

//----------------------------------------------------
/**
*/
HRESULT STDMETHODCALLTYPE DragSource::GiveFeedback(
/* [in] */ DWORD
#if defined DBG_CONSOLE_OUT
dwEffect
#endif
)
{
#if defined DBG_CONSOLE_OUT
	printf("\nDragSource::GiveFeedback %d", dwEffect);
#endif

	return DRAGDROP_S_USEDEFAULTCURSORS;
}

// XServiceInfo
OUString SAL_CALL DragSource::getImplementationName(  ) throw (RuntimeException)
{
	return OUString(RTL_CONSTASCII_USTRINGPARAM(DNDSOURCE_IMPL_NAME));;
}
// XServiceInfo
sal_Bool SAL_CALL DragSource::supportsService( const OUString& ServiceName ) throw (RuntimeException)
{
	if( ServiceName.equals(OUString(RTL_CONSTASCII_USTRINGPARAM(DNDSOURCE_SERVICE_NAME ))))
		return sal_True;
	return sal_False;
}

Sequence< OUString > SAL_CALL DragSource::getSupportedServiceNames(  ) throw (RuntimeException)
{
	OUString names[1]= {OUString(RTL_CONSTASCII_USTRINGPARAM(DNDSOURCE_SERVICE_NAME))};

	return Sequence<OUString>(names, 1);
}

//----------------------------------------------------
/**This function is called as extra thread from
	DragSource::executeDrag. The function
	carries out a drag and drop operation by calling
	DoDragDrop. The thread also notifies all
	XSourceListener.
*/
unsigned __stdcall DndOleSTAFunc(LPVOID pParams)
{
	// The structure contains all arguments for DoDragDrop and other
	DragSource *pSource= (DragSource*)pParams;

	// Drag and drop only works in a thread in which OleInitialize is called.
	HRESULT hr= OleInitialize( NULL);

	if(SUCCEEDED(hr))
	{
		// We force the creation of a thread message queue. This is necessary
		// for a later call to AttachThreadInput
		MSG msgtemp;
		PeekMessage( &msgtemp, NULL, WM_USER, WM_USER, PM_NOREMOVE);

		DWORD threadId= GetCurrentThreadId();

		// This thread is attached to the thread that created the window. Hence
		// this thread also receives all mouse and keyboard messages which are
		// needed by DoDragDrop
		AttachThreadInput( threadId , pSource->m_threadIdWindow, TRUE );

		DWORD dwEffect= 0;
		hr= DoDragDrop(
			pSource->m_spDataObject.get(),
			static_cast<IDropSource*>(pSource),
			dndActionsToDropEffects( pSource->m_sourceActions),
			&dwEffect);

		// #105428 detach my message queue from the other threads
		// message queue before calling fire_dragDropEnd else
		// the office may appear to hang sometimes
		AttachThreadInput( threadId, pSource->m_threadIdWindow, FALSE);

		//--> TRA
		// clear the global transferable again
		g_XTransferable = Reference< XTransferable >( );
		//<-- TRA

		OSL_ENSURE( hr != E_INVALIDARG, "IDataObject impl does not contain valid data");

		//Fire event
		sal_Int8 action= hr == DRAGDROP_S_DROP ? dndOleDropEffectsToActions( dwEffect) : ACTION_NONE;

		static_cast<SourceContext*>(pSource->m_currentContext.get())->fire_dragDropEnd(
														hr == DRAGDROP_S_DROP ? sal_True : sal_False, action);

		// Destroy SourceContextslkfgj
		pSource->m_currentContext= 0;
		// Destroy the XTransferable wrapper
		pSource->m_spDataObject=0;

		OleUninitialize();
	}

	InterlockedDecrement(&pSource->m_RunningDndOperationCount);

	// the DragSource was manually acquired by
	// thread starting method DelayedStartDrag
	pSource->release();

	return 0;
}