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scrnobj.c

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/*************************************************************************
*   FILE: scrnobj.c
* AUTHOR: CAL
* DATE: 25 April 1993
* PURPOSE:
*   Contains functions which handle a list of ScreenObjects.
*   A ScreenObject is any interactive object which can be drawn on
*   the screen, like a window or a button.
**************************************************************************/

#include "scrnobj.h"


void ScrnObjList::Insert (ScrnObj *a)
{
  a->Next = First;
  First = a;
  if (!Current)
    Current = First;
  if (!Last)
    Last = First;
}


void ScrnObjList::Append (ScrnObj *a)
{
  if (Last)
  {
    Last->Next = a;
    Last = a;
  }
  else
    Insert (a);
}


void ScrnObjList::Remove (ScrnObj *a)
{
  if (First == a)
  {
    ScrnObj* tmp = First;
    First = First->Next;
    delete tmp;
  }
  else
  {
    ScrnObj* prev = First;
    ScrnObj* curr = First->Next;
    while (curr)
    {
      if (curr == a)
      {
  prev->Next = curr->Next;
  if (curr == Last)
    Last = prev;
  delete curr;
  curr = NULL;
      }
      else
      {
  prev = curr;
  curr = curr->Next;
      }
    }
  }
  Current = First;
}


bool ScrnObjList::Reset (void)
{
  Current = First;
  return (bool) (Current);
}


bool ScrnObjList::Next (void)
{
  if (Current)
    Current = Current->Next;
  return (bool) (Current);
}


void ScrnObjList::Nuke (void)
{
  delete First;
  First = Current = Last = NULL;
}

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