xref: /aoo4110/main/fpicker/source/win32/filepicker/dibpreview.hxx (revision b1cdbd2c)

/**************************************************************
 *
 * 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
 *
 * 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
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#ifndef _DIBPREVIEW_HXX_
#define _DIBPREVIEW_HXX_

//------------------------------------------------------------------------
// includes
//------------------------------------------------------------------------

#include "previewbase.hxx"
#include <osl/mutex.hxx>

#if defined _MSC_VER
#pragma warning(push, 1)
#endif
#include <windows.h>
#if defined _MSC_VER
#pragma warning(pop)
#endif

//---------------------------------------------
// A very simple wrapper for a window that does
// display DIBs.
// Maybe it would be better and more extensible
// to create another class that is responsible
// for rendering a specific image format into
// the area of the window, but for our purpose
// it's enough to go the simple way - KISS.
//---------------------------------------------

class CDIBPreview : public PreviewBase
{
public:

	// ctor
	CDIBPreview(HINSTANCE instance,HWND parent,sal_Bool bShowWindow = sal_False);

    // dtor
	virtual ~CDIBPreview( );

	// preview interface implementation

    virtual sal_Int32 SAL_CALL getTargetColorDepth()
		throw (::com::sun::star::uno::RuntimeException);

    virtual sal_Int32 SAL_CALL getAvailableWidth()
		throw (::com::sun::star::uno::RuntimeException);

    virtual sal_Int32 SAL_CALL getAvailableHeight()
		throw (::com::sun::star::uno::RuntimeException);

    virtual void SAL_CALL setImage(sal_Int16 aImageFormat, const ::com::sun::star::uno::Any& aImage)
		throw (::com::sun::star::lang::IllegalArgumentException, ::com::sun::star::uno::RuntimeException);

    virtual sal_Bool SAL_CALL setShowState(sal_Bool bShowState)
		throw (::com::sun::star::uno::RuntimeException);

    virtual sal_Bool SAL_CALL getShowState()
		throw (::com::sun::star::uno::RuntimeException);

	virtual HWND SAL_CALL getWindowHandle() const;

private:
	virtual void SAL_CALL onPaint( HWND hWnd, HDC hDC );

    ATOM SAL_CALL RegisterDibPreviewWindowClass( );
    void SAL_CALL UnregisterDibPreviewWindowClass( );

    static LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam );

private:
	HINSTANCE  m_Instance;
	HWND	   m_Hwnd;
	com::sun::star::uno::Sequence<sal_Int8> m_Image;
	osl::Mutex	m_PaintLock;

    // the preview window class has to be registered only
    // once per process, so multiple instance of this class
    // share the registered window class
    static ATOM       s_ClassAtom;
    static osl::Mutex s_Mutex;
    static sal_Int32  s_RegisterDibPreviewWndCount;

// prevent copy and assignment
private:
    CDIBPreview(const CDIBPreview&);
    CDIBPreview& operator=(const CDIBPreview&);
};


#endif