L_DispContainerGetPrePaintCallBack

#include "l_bitmap.h"

L_LTIVW_API L_INT EXT_FUNCTION L_DispContainerGetPrePaintCallBack(hCellWnd, ppfnCallBack, ppUserData)

HWND hCellWnd;	/* handle to the cell window */
DISPCONTAINERPREPAINTCALLBACK * ppfnCallBack;	/* pointer to the callback function */
LPVOID * ppUserData;	/* pointer to be updated with user data */

Gets the current action callback function along with the user data, which were set using L_DispContainerSetPrePaintCallBack.

Parameter	Description
hCellWnd	A handle to the window that represents the Medical Viewer Cell.
ppfnCallBack	Pointer to a pointer to a callback function to be updated with the last pre-paint callback function set using L_DispContainerSetPrePaintCallBack.
ppUserData	Void pointer to be updated with the value of user defined data associated with the tag callback. If you are not interested in the user-defined data, pass NULL for this parameter.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Required DLLs and Libraries

LTIVW
For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

See Also

Functions:	L_DispContainerSetMouseCallBack, L_DispContainerSetActionCallBack, L_DispContainerSetTagCallBack, L_DispContainerGetTagCallBack, L_DispContainerSetAnnotationCallBack, L_DispContainerGetAnnotationCallBack, L_DispContainerGetAnnotationCreatedCallBack, L_DispContainerSetAnnotationCreatedCallBack, L_DispContainerSetPrePaintCallBack, DISPCONTAINERPREPAINTCALLBACK, L_DispContainerGetPostPaintCallBack, L_DispContainerSetPostPaintCallBack, DISPCONTAINERPOSTPAINTCALLBACK, DISPCONTAINERANNOTATIONCALLBACK, DISPCONTAINERANNOTATIONCREATEDCALLBACK, DISPCONTAINERTAGCALLBACK, DISPCONTAINERACTIONCALLBACK
Topics:	Image Viewer Cells
	Image Viewer Functions: Image Viewer Cells

Example

This example hides the odd frames

#if defined LEADTOOLS_V17_OR_LATER
L_INT EXT_CALLBACK PrePaintCallBack(HWND hCellWnd,
                                    pDISPCONTAINERCELLINFO pCellInfo,
                                    L_VOID *               pUserData)
{
   UNREFERENCED_PARAMETER(hCellWnd);
   UNREFERENCED_PARAMETER(pUserData);
   if ((pCellInfo->nSubCellIndex | 0x1) != pCellInfo->nSubCellIndex)
   {
      FillRect(pCellInfo->hDC, &pCellInfo->rcRect, GetStockBrush(GRAY_BRUSH));
      return FAILURE;
   }
   return SUCCESS;
}

L_INT DispContainerPrePaintExample(HDISPCONTAINER hCon)
{
   DISPCONTAINERPREPAINTCALLBACK oldCallBack;
   L_VOID *                      pOldUserData;

   if (L_DispContainerGetCellCount(hCon, 0) == 0)
   {
      MessageBox(NULL, TEXT("you must at least have one cell added to the viewer"), TEXT("No Cell attached"), MB_OK);
      return FAILURE;
   }

   HWND hCellWnd = L_DispContainerGetCellWindowHandle(hCon, 0, 0);

   L_DispContainerGetPrePaintCallBack(hCellWnd, &oldCallBack, &pOldUserData);

   L_DispContainerSetPrePaintCallBack(hCellWnd, PrePaintCallBack, hCon);

   return SUCCESS;
}


#else



L_INT EXT_CALLBACK PrePaintCallBack(pDISPCONTAINERCELLINFO pCellInfo,
                                    L_VOID *               pUserData)
{
   UNREFERENCED_PARAMETER(pUserData);
   if ((pCellInfo->nSubCellIndex | 0x1) != pCellInfo->nSubCellIndex)
   {
      FillRect(pCellInfo->hDC, &pCellInfo->rcRect, GetStockBrush(GRAY_BRUSH));
      return FAILURE;
   }
   return SUCCESS;
}

L_INT DispContainerPrePaintExample(HDISPCONTAINER hCon)
{
   DISPCONTAINERPREPAINTCALLBACK oldCallBack;
   L_VOID *                      pOldUserData;


   L_DispContainerGetPrePaintCallBack(hCon, &oldCallBack, &pOldUserData);

   L_DispContainerSetPrePaintCallBack(hCon, PrePaintCallBack, hCon);

   return SUCCESS;
}


#endif