Transparency.c

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/*-----------------------------------------------------------------------------------*/
/* INRIA 2005 */
/* Allan CORNET */
/*-----------------------------------------------------------------------------------*/
#include "Transparency.h"
/*-----------------------------------------------------------------------------------*/
#ifndef WS_EX_LAYERED
  #define WS_EX_LAYERED           0x00080000
#endif

#ifndef LWA_COLORKEY
#define LWA_COLORKEY            0x00000001
#endif

#ifndef LWA_ALPHA
#define LWA_ALPHA               0x00000002
#endif
/*-----------------------------------------------------------------------------------*/
static int CurrentAlphaLevel=255;
static BOOL TransparencyON=FALSE;
/*-----------------------------------------------------------------------------------*/
extern LPTW GetTextWinScilab(void);
/*-----------------------------------------------------------------------------------*/
BOOL IsEnableTransparencyMode(void)
{
        return TransparencyON;
}
/*-----------------------------------------------------------------------------------*/
BOOL ActivateTransparencyMode(HWND hWnd)
{
        BOOL bOK=FALSE;
        TransparencyON=TRUE;
        bOK=TRUE;

        return bOK;
}
/*-----------------------------------------------------------------------------------*/
BOOL DisableTransparencyMode(HWND hWnd)
{
        BOOL bOK=FALSE;

        SetWindowLong(hWnd,     GWL_EXSTYLE,CS_HREDRAW | CS_VREDRAW);
        CurrentAlphaLevel=255;
        TransparencyON=FALSE;
        bOK=TRUE;

        return bOK;
}
/*-----------------------------------------------------------------------------------*/
void ScilabFxFadeOut(void)
{
        LPTW lptw=GetTextWinScilab();
        int i=0;
        for (i=GetCurrentAlphaLevel();i>=0;i=i-16)
        {
                SetCurrentAlphaLevel(lptw->hWndParent ,i);
                SetCurrentAlphaLevel(lptw->hWndText ,i);
        }
}
/*-----------------------------------------------------------------------------------*/
int GetCurrentAlphaLevel(void)
{
        return CurrentAlphaLevel;
}
/*-----------------------------------------------------------------------------------*/
void SetCurrentAlphaLevel(HWND hWnd ,int Alpha)
{
        if ( (Alpha>=0) && (Alpha<=255) )
        {
                SetLayeredWindowAttributes(hWnd, (COLORREF)NULL,CurrentAlphaLevel, LWA_ALPHA);
        }
        CurrentAlphaLevel=Alpha;
}
/*-----------------------------------------------------------------------------------*/
BOOL IncreaseAlphaLevel(void)
{
        BOOL bOK=FALSE;
        LPTW lptw=GetTextWinScilab();
        int Alpha=GetCurrentAlphaLevel();

        if (Alpha==255)
        {
                DisableTransparencyMode(lptw->hWndParent);
                DisableTransparencyMode(lptw->hWndText);
                DragAcceptFiles (lptw->hWndParent, TRUE);
                InvalidateRect(lptw->hWndParent,NULL,TRUE);
                InvalidateRect(lptw->hWndText,NULL,TRUE);
        }
        else
        {
                if (Alpha<255)
                {
                        SetCurrentAlphaLevel(lptw->hWndParent ,Alpha++);
                        SetCurrentAlphaLevel(lptw->hWndText ,Alpha++);
                        if (Alpha>255) Alpha=255;
                }
        }
        return bOK;
}
/*-----------------------------------------------------------------------------------*/
BOOL DecreaseAlphaLevel(void)
{
        BOOL bOK=FALSE;
        LPTW lptw=GetTextWinScilab();
        int Alpha=GetCurrentAlphaLevel();

        if (Alpha<0) Alpha=0;
        else
        {
                SetCurrentAlphaLevel(lptw->hWndParent ,Alpha--);
                SetCurrentAlphaLevel(lptw->hWndText ,Alpha--);
        }
        return bOK;
}
/*-----------------------------------------------------------------------------------*/

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