LImageViewer::PrePaintCallBack

#include "ltwrappr.h"

virtual L_INT LImageViewer::PrePaintCallBack(pCellInfo)

/* pointer to a cell information structure */

This callback function is called before painting the cell or sub-cell.

Parameter	Description
pCellInfo	Pointer to the DISPCONTAINERCELLINFO structure to be updated with the cell information.

Returns

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

Comments

In order to use this callback function, it must first be set by calling the LImageViewer::EnablePrePaintCallBack function.

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:	LImageViewer::EnableLowMemoryUsageCallBack, LImageViewer::LowMemoryUsageCallBack, LImageViewer::RegionCallBack, LImageViewer::EnableRegionCallBack, LImageViewer::EnableMouseCallBack, LImageViewer::ActionCallBack, LImageViewer::TagCallBack, LImageViewer::EnableTagCallBack, LImageViewer::EnableAnnotationCallBack, LImageViewer::EnableAnnotationCreatedCallBack, LImageViewer::EnablePrePaintCallBack, LImageViewer::EnablePostPaintCallBack, LImageViewer::PostPaintCallBack, Class Members
Topics:	Image Viewer Cells
	Image Viewer Functions: Callbacks
	Image Viewer Functions: Image Viewer Cells

Example

This example hides the odd frames

#ifdef LImageViewerChild 
class LImageViewerChild :public LImageViewer
{
   virtual L_INT PrePaintCallBack (pDISPCONTAINERCELLINFO pCellInfo);
} ;
#endif 
L_INT LImageViewerChild::PrePaintCallBack (pDISPCONTAINERCELLINFO pCellInfo)
{
   if ((pCellInfo->nSubCellIndex | 0x1) != pCellInfo->nSubCellIndex)
   {
      FillRect(pCellInfo->hDC, &pCellInfo->rcRect, (HBRUSH)GetStockObject(GRAY_BRUSH));
      return FAILURE;
   }
   return SUCCESS;
}
L_INT LImageViewer_PrePaintExample(LImageViewer& ImageViewer)
{
   ImageViewer.EnablePrePaintCallBack(TRUE);
   return SUCCESS;
}