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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 .
*/
#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 <cppuhelper/supportsservice.hxx>
#include <o3tl/any.hxx>
#include <tools/diagnose_ex.h>
#include <process.h>
#include <memory>
#include "source.hxx"
#include "globals.hxx"
#include "sourcecontext.hxx"
#include "DtObjFactory.hxx"
#include <rtl/ustring.h>
#include <osl/thread.h>
#include <winuser.h>
#include <stdio.h>
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;
static unsigned __stdcall DndOleSTAFunc(LPVOID pParams);
DragSource::DragSource( const Reference<XComponentContext>& rxContext):
WeakComponentImplHelper< XDragSource, XInitialization, XServiceInfo >(m_mutex),
m_xContext( rxContext ),
// m_pcurrentContext_impl(0),
m_hAppWindow(nullptr),
m_MouseButton(0),
m_RunningDndOperationCount(0)
{
}
DragSource::~DragSource()
{
}
/** 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
// function. 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 = new SourceContext(this, listener);
// Convert the XTransferable data object into an IDataObject object;
//--> TRA
g_XTransferable = trans;
//<-- TRA
m_spDataObject= CDTransObjFactory::createDataObjFromTransferable(
m_xContext, 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 too 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(
nullptr, 0, DndOleSTAFunc, this, 0, &threadId));
// detach from thread
CloseHandle(hThread);
}
// XInitialization
/** aArguments contains a machine id */
void SAL_CALL DragSource::initialize( const Sequence< Any >& aArguments )
{
if( aArguments.getLength() >=2)
m_hAppWindow= reinterpret_cast<HWND>(static_cast<sal_uIntPtr>(*o3tl::doAccess<sal_uInt64>(aArguments[1])));
OSL_ASSERT( IsWindow( m_hAppWindow) );
}
/** XDragSource */
sal_Bool SAL_CALL DragSource::isDragImageSupported( )
{
return false;
}
sal_Int32 SAL_CALL DragSource::getDefaultCursor( sal_Int8 /*dragAction*/ )
{
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 )
{
// 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
{
cnt = InterlockedDecrement(&m_RunningDndOperationCount);
DragSourceDropEvent dsde;
dsde.DropAction = ACTION_NONE;
dsde.DropSuccess = false;
try
{
listener->dragDropEnd(dsde);
}
catch(RuntimeException&)
{
TOOLS_WARN_EXCEPTION( "vcl", "Runtime exception during event dispatching");
}
}
}
/** IDropTarget */
HRESULT STDMETHODCALLTYPE DragSource::QueryInterface( REFIID riid, void **ppvObject)
{
if( !ppvObject)
return E_POINTER;
*ppvObject= nullptr;
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()
{
acquire();
return static_cast<ULONG>(m_refCount);
}
ULONG STDMETHODCALLTYPE DragSource::Release()
{
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( )
{
return "com.sun.star.comp.datatransfer.dnd.OleDragSource_V1";
}
// XServiceInfo
sal_Bool SAL_CALL DragSource::supportsService( const OUString& ServiceName )
{
return cppu::supportsService(this, ServiceName);
}
Sequence< OUString > SAL_CALL DragSource::getSupportedServiceNames( )
{
return { "com.sun.star.datatransfer.dnd.OleDragSource" };
}
extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
dtrans_DragSource_get_implementation(
css::uno::XComponentContext* context, css::uno::Sequence<css::uno::Any> const&)
{
return cppu::acquire(new DragSource(context));
}
/** 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)
{
osl_setThreadName("DragSource DndOleSTAFunc");
// The structure contains all arguments for DoDragDrop and other
DragSource *pSource= static_cast<DragSource*>(pParams);
// Drag and drop only works in a thread in which OleInitialize is called.
HRESULT hr= OleInitialize( nullptr);
if(SUCCEEDED(hr))
{
// We force the creation of a thread message queue. This is necessary
// for a later call to AttachThreadInput
MSG msgtemp;
PeekMessageW( &msgtemp, nullptr, 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.clear();
//<-- 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, action);
// Destroy SourceContextslkfgj
pSource->m_currentContext= nullptr;
// Destroy the XTransferable wrapper
pSource->m_spDataObject=nullptr;
OleUninitialize();
}
InterlockedDecrement(&pSource->m_RunningDndOperationCount);
// the DragSource was manually acquired by
// thread starting method DelayedStartDrag
pSource->release();
return 0;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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