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Diffstat (limited to 'vcl/win/dtrans/source.cxx')
| -rw-r--r-- | vcl/win/dtrans/source.cxx | 373 |
1 files changed, 373 insertions, 0 deletions
diff --git a/vcl/win/dtrans/source.cxx b/vcl/win/dtrans/source.cxx new file mode 100644 index 0000000000..94124b23dd --- /dev/null +++ b/vcl/win/dtrans/source.cxx @@ -0,0 +1,373 @@ +/* -*- 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 <comphelper/diagnose_ex.hxx> + +#include <process.h> +#include <memory> + +#include <win/dnd_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(void* pParams); + +DragSource::DragSource( const Reference<XComponentContext>& rxContext): + WeakComponentImplHelper< XDragSource, XInitialization, XServiceInfo >(m_aMutex), + 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. + HANDLE hThread + = reinterpret_cast<HANDLE>(_beginthreadex(nullptr, 0, DndOleSTAFunc, this, 0, nullptr)); + + // 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(void* 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: */ |