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Diffstat (limited to 'vcl/inc/win/dnd_target.hxx')
| -rw-r--r-- | vcl/inc/win/dnd_target.hxx | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/vcl/inc/win/dnd_target.hxx b/vcl/inc/win/dnd_target.hxx new file mode 100644 index 000000000..4c4e8eebc --- /dev/null +++ b/vcl/inc/win/dnd_target.hxx @@ -0,0 +1,177 @@ +/* -*- 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 DWORD WINAPI DndTargetOleSTAFunc(LPVOID 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 + DWORD 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: */ |