以前写了一篇日记， 显示略缩图，见

《​​自绘列表框控件显示略缩图----再稍微改进点点。。​​》



这次给他加点改进，就是增加删除被勾选的图片。。。

增加两个函数：


CString MakeFilename(int nItem);
BOOL ClearChecked(int nSubItem = 0);   //clear all checked item


CString CListImageCtrl::MakeFilename(int nItem)
{
  ASSERT(nItem >= 0);
  ASSERT(nItem < GetItemCount());
  if ((nItem < 0) || nItem >= GetItemCount())
    return FALSE;

  ASSERT(!m_VectorImageNames.empty());

  // read the image file
  CString  fileName;
  if (m_strImageDir.Right(1) == TEXT("\\") )
    fileName.Format( TEXT("%s%s"), m_strImageDir, m_VectorImageNames[nItem] );
  else
    fileName.Format( TEXT("%s\\%s"),m_strImageDir, m_VectorImageNames[nItem] );

  return fileName;
}

BOOL CListImageCtrl::ClearChecked(int nSubItem /*= -1*/)
{
  // hold the window update to avoid flicking
  SetRedraw(FALSE);

  //
  ASSERT(nSubItem >= 0);
  ASSERT(nSubItem < GetColumns());
  if ((nSubItem < 0) || nSubItem >= GetColumns())
    return FALSE;

  unsigned  int offset = 0;
  int n = GetItemCount();
  for (int nItem = 0; nItem < n; nItem++)
  {
    unsigned int idx = nItem-offset;

    XLISTCTRLDATA *pXLCD = (XLISTCTRLDATA *) CListCtrl::GetItemData(idx);
    if (!pXLCD)
    {
      continue;
    }

    if (pXLCD[nSubItem].nCheckedState == 1 )  //checked, delete it
    {
      CString file = MakeFilename(idx);
      DeleteFile(file);

      m_VectorImageNames.erase(m_VectorImageNames.begin() + idx);

      //m_ImageListThumb.Remove(idx);   //error?
      
      this->DeleteItem(idx);
      
      offset++;

      if(m_nSelectedItem == idx)
        m_nSelectedItem = -1;
    }
  }

  Arrange(LVA_ALIGNTOP);
  SetRedraw(); 

  return TRUE;
}