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

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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

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