OSDCalcIndices.c

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#include                <string.h>
#include                "FBLib_TMSOSDMenu.h"
 
void OSDCalcIndices(void)
{
  TRACEENTER();
 
  tMenu                *pMenu;
 
  pMenu = &Menu[CurrentMenuLevel];
 
  //if TopIndex or SelectionIndex has changed, make list dirty
  if(pMenu->OSDMenuDisplayMode == OMDM_Memo || pMenu->OSDMenuDisplayMode == OMDM_Text)
  {
    pMenu->CurrentTopIndex = pMenu->CurrentSelection;
 
    if (pMenu->OSDMenuDisplayMode == OMDM_Text)
    {
      if (pMenu->CurrentTopIndex + pMenu->NrLines > pMenu->NrItems)
      {
        pMenu->CurrentTopIndex = pMenu->NrItems - pMenu->NrLines;
 
        if (pMenu->CurrentTopIndex < 0) pMenu->CurrentTopIndex = 0;
 
        pMenu->CurrentSelection = pMenu->CurrentTopIndex;
      }
    }
  }
  else
  {
    if(pMenu->CurrentSelection < pMenu->CurrentTopIndex)
    {
      if(pMenu->CurrentSelection > 0)
      {
        //Check if there are selectable items above the current selection
        bool            Selectable;
        int             i;
 
        Selectable = FALSE;
        for(i = pMenu->CurrentSelection - 1; i >= 0; i--)
        {
          if(pMenu->Item[i].Selectable)
          {
            Selectable = TRUE;
            break;
          }
        }
        if(Selectable)
          pMenu->CurrentTopIndex = pMenu->CurrentSelection;
        else
          pMenu->CurrentTopIndex = 0;
      }
      else
      {
        pMenu->CurrentTopIndex = pMenu->CurrentSelection;
      }
    }
 
 
    if(pMenu->CurrentSelection > (pMenu->CurrentTopIndex + pMenu->NrLines - 1))
    {
      if(pMenu->CurrentSelection < pMenu->NrItems - 1)
      {
        //Check if there are selectable items above the current selection
        bool            Selectable;
        int             i;
 
        Selectable = FALSE;
        for(i = pMenu->CurrentSelection + 1; i < pMenu->NrItems; i++)
        {
          if(pMenu->Item[i].Selectable)
          {
            Selectable = TRUE;
            break;
          }
        }
        if(Selectable)
          pMenu->CurrentTopIndex = pMenu->CurrentSelection - pMenu->NrLines + 1;
        else
          pMenu->CurrentTopIndex = pMenu->NrItems - pMenu->NrLines;
 
        if((pMenu->CurrentSelection - pMenu->CurrentTopIndex) > pMenu->NrLines)
          pMenu->CurrentTopIndex = pMenu->CurrentSelection - pMenu->NrLines;
      }
      else
      {
        pMenu->CurrentTopIndex = pMenu->CurrentSelection - pMenu->NrLines + 1;
      }
    }
  }
 
  TRACEEXIT();
}