c++ - 如何将列宽调整为CListCtrl中最长字符串的宽度？

Question

我正在尝试:

tstring subItemText;
    CDC* pDc = GetListCtrl().GetDC(); 
    for (int row = GetItemCount() - 1; row >= 0; --row) 
    {
      subItemText = _T("");
      for (int col = 0; col < NumCol; ++col)  
      {
        subItemText = this->GetSubItemString( GetItemData(row), col);
        CSize sz; 
        // get length of the string in logical units, by default 1 unit == 1 pixel, type of font is accounted
        sz = pDc->GetOutputTextExtent(subItemText.c_str());
        if (static_cast<int>(sz.cx) > ColWidth[col])
          ColWidth[col] = sz.cx; 
      }
    } 
    GetListCtrl().ReleaseDC (pDc);
    for (int col = 0; col < NumCol; ++col) 
    {
      SetColumnWidth(col, ColWidth[col]);
    }

因为列的宽度比该列中最大的字符串之一大 20/30%。我希望列的宽度等于具有最大长度的字符串的宽度。

提前致谢!

Answer 1

这可能是因为您没有在设备上下文中选择正确的字体。试试这个:

    tstring subItemText;
    CDC* pDc = GetListCtrl().GetDC(); 

    CFont *normalfont = GetListCtrl().GetFont() ;
    CFont *oldfont = pDc->SelectObject(normalfont) ;

    for (int row = GetItemCount() - 1; row >= 0; --row) 
    {
      subItemText = _T("");
      for (int col = 0; col < NumCol; ++col)  
      {
        subItemText = this->GetSubItemString( GetItemData(row), col);
        CSize sz; 
        // get length of the string in logical units, by default 1 unit == 1 pixel, type of font is accounted
        sz = pDc->GetOutputTextExtent(subItemText.c_str());
        if (static_cast<int>(sz.cx) > ColWidth[col])
          ColWidth[col] = sz.cx; 
      }
    } 

    pDc->SelectObject(oldfont) ;

    GetListCtrl().ReleaseDC (pDc);
    for (int col = 0; col < NumCol; ++col) 
    {
      SetColumnWidth(col, ColWidth[col]);
    }