libreoffice/fpicker/source/win32/filepicker/dibpreview.hxx

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *
 * 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
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 *   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
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 */

#ifndef INCLUDED_FPICKER_SOURCE_WIN32_FILEPICKER_DIBPREVIEW_HXX
#define INCLUDED_FPICKER_SOURCE_WIN32_FILEPICKER_DIBPREVIEW_HXX

#include "previewbase.hxx"
#include <com/sun/star/uno/Sequence.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,bool bShowWindow = false);

    // dtor
    virtual ~CDIBPreview( ) override;

    // preview interface implementation

    virtual sal_Int32 SAL_CALL getTargetColorDepth()
        throw (css::uno::RuntimeException) override;

    virtual sal_Int32 SAL_CALL getAvailableWidth()
        throw (css::uno::RuntimeException) override;

    virtual sal_Int32 SAL_CALL getAvailableHeight()
        throw (css::uno::RuntimeException) override;

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

    virtual bool SAL_CALL setShowState(bool bShowState)
        throw (css::uno::RuntimeException) override;

    virtual bool SAL_CALL getShowState()
        throw (css::uno::RuntimeException) override;

    virtual HWND SAL_CALL getWindowHandle() const override;

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;
    css::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

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