CListCtrl列表中，改写几列的文字颜色

最新推荐文章于 2024-10-22 11:23:04 发布

slj_win

最新推荐文章于 2024-10-22 11:23:04 发布

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分类专栏： VC 文章标签： colors windows notifications processing list function

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本文详细介绍了如何在Visual C++中通过添加NM_CUSTOMDRAW消息来修改ListCtrl控件中不同列的文字颜色，包括设置文字和背景颜色，并在每个子项绘制前处理消息。

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ListCtrl控件添加NM_CUSTOMDRAW消息

VC6没有ListCtrl控件的NM_CUSTOMDRAW属性，要自己添加，添加的步骤：
1、Message Map

BEGIN_MESSAGE_MAP( ... , ...)
        //{{AFX_MSG_MAP(CCustomDrawDlg)
        // ......
       ON_NOTIFY(NM_CUSTOMDRAW, IDC_LIST, OnNMCustomdrawList)
                 // Add here
                 // IDC_LIST Specify the ID of the Ctrl
                 // OnNMCustomdrawCtrl Specify the function name
       //}}AFX_MSG_MAP
END_MESSAGE_MAP()

2、类的声明中添加
afx_msg void OnNMCustomdrawList(NMHDR *pNMHDR, LRESULT *pResult);

3、对应的cpp文件中添加定义

CListCtrl列表中，改写几列的文字颜色

在ListCtrl控件绘画前处理NM_CUSTOMDRAW消息。
告诉Windows我们想对每个Item处理NM_CUSTOMDRAW消息。当这些消息中的一个到来，告诉Windows我们想在每个SubItem的绘制前处理这个消息当这些消息到达，我们就为每个SubItem设置文字和背景的颜色。

void CMyDlg::OnCustomdrawMyList ( NMHDR* pNMHDR, LRESULT* pResult )
{
NMLVCUSTOMDRAW* pLVCD = reinterpret_cast<NMLVCUSTOMDRAW*>( pNMHDR ); // Take the default processing unless we set this to something else below.
*pResult = CDRF_DODEFAULT; // First thing - check the draw stage. If it's the control's prepaint
// stage, then tell Windows we want messages for every item.
if ( CDDS_PREPAINT == pLVCD->nmcd.dwDrawStage )
{
*pResult = CDRF_NOTIFYITEMDRAW;
}
elseif ( CDDS_ITEMPREPAINT == pLVCD->nmcd.dwDrawStage )
{
// This is the notification message for an item. We'll request
// notifications before each subitem's prepaint stage.
*pResult = CDRF_NOTIFYSUBITEMDRAW;
}
elseif ( (CDDS_ITEMPREPAINT | CDDS_SUBITEM) == pLVCD->nmcd.dwDrawStage )
{
// This is the prepaint stage for a subitem. Here's where we set the
// item's text and background colors. Our return value will tell
// Windows to draw the subitem itself, but it will use the new colors
// we set here.
// The text color will cycle through red, green, and light blue.
// The background color will be light blue for column 0, red for
// column 1, and black for column 2.
COLORREF crText, crBkgnd;
if ( 0 == pLVCD->iSubItem )
{
crText = RGB(255,0,0);
crBkgnd = RGB(128,128,255);
}
elseif ( 1 == pLVCD->iSubItem )
{
crText = RGB(0,255,0);
crBkgnd = RGB(255,0,0);
}
else
{
crText = RGB(128,128,255);
crBkgnd = RGB(0,0,0);
}
// Store the colors back in the NMLVCUSTOMDRAW struct.
pLVCD->clrText = crText;
pLVCD->clrTextBk = crBkgnd;
// Tell Windows to paint the control itself.
*pResult = CDRF_DODEFAULT;
}
}

void CMyDlg::OnCustomdrawMyList ( NMHDR* pNMHDR, LRESULT* pResult )
{
  NMLVCUSTOMDRAW* pLVCD = reinterpret_cast<NMLVCUSTOMDRAW*>( pNMHDR );     // Take the default processing unless we set this to something else below.    
  *pResult = CDRF_DODEFAULT;     // First thing - check the draw stage. If it's the control's prepaint    
  // stage, then tell Windows we want messages for every item.     
  if ( CDDS_PREPAINT == pLVCD->nmcd.dwDrawStage )
  {
      *pResult = CDRF_NOTIFYITEMDRAW;
  }    
  elseif ( CDDS_ITEMPREPAINT == pLVCD->nmcd.dwDrawStage )        
  {
          // This is the notification message for an item. We'll request        
          // notifications before each subitem's prepaint stage.         
          *pResult = CDRF_NOTIFYSUBITEMDRAW;        
  }    
  elseif ( (CDDS_ITEMPREPAINT | CDDS_SUBITEM) == pLVCD->nmcd.dwDrawStage )        
  {
          // This is the prepaint stage for a subitem. Here's where we set the        
          // item's text and background colors. Our return value will tell         
          // Windows to draw the subitem itself, but it will use the new colors        
          // we set here.        
          // The text color will cycle through red, green, and light blue.        
          // The background color will be light blue for column 0, red for        
          // column 1, and black for column 2.            
          
          COLORREF crText, crBkgnd;                
          if ( 0 == pLVCD->iSubItem )
          {            
            crText = RGB(255,0,0);            
            crBkgnd = RGB(128,128,255);            
          }        
          elseif ( 1 == pLVCD->iSubItem )            
          {         
             crText = RGB(0,255,0);            
             crBkgnd = RGB(255,0,0);            
          }        
          else            
          {          
             crText = RGB(128,128,255);            
             crBkgnd = RGB(0,0,0);          
          }         
          // Store the colors back in the NMLVCUSTOMDRAW struct.        
          
          pLVCD->clrText = crText;        
          pLVCD->clrTextBk = crBkgnd;         
          
          // Tell Windows to paint the control itself.        
          *pResult = CDRF_DODEFAULT;        
   }
}

这里需要注意两件事：

l clrTextBk的颜色只是针对每一列，在最后一列的右边那个区域颜色也还是和ListCtrl控件的背景颜色一致。l 当我重新看文档的时候，我注意到有一篇题目是“NM_CUSTOMDRAW (list view)”的文章，它说你可以在最开始的custom draw消息中返回CDRF_NOTIFYSUBITEMDRAW就可以处理SubItem了，而不需要在CDDS_ITEMPREPAINT绘画段中去指定CDRF_NOTIFYSUBITEMDRAW。但是我试了一下，发现这种方法并不起作用，你还是需要处理CDDS_ITEMPREPAINT段。