扩展CListCtrl实现颜色长度改变

用CListCtrl来显示数据比较方便，有时候我们需要标注某一列或某一个单元格的背景和字体颜色，或者需要改变一下行高和字体大小，CListCtrl要改变这些并不是很方便。本文将介绍如何派生一个类来改变CListCtrl及其表头的高度、字体大小、列背景颜色、单元格背景颜色、列字体颜色、单元格字体颜色

实现过程：

1.表头修改
　　新建一个MFC类CHeaderCtrlCl,其基类为CHeaderCtrl，响应OnPaint消息实现自绘，在头文件中定义函数LRESULT OnLayout( WPARAM wParam, LPARAM lParam )，之后手动添加消息响应ON_MESSAGE(HDM_LAYOUT, OnLayout)，在消息响应中改变高度。

HeaderCtrlCl.h文件的代码如下：

class CHeaderCtrlCl : public CHeaderCtrl

{

DECLARE_DYNAMIC(CHeaderCtrlCl)

public:

CHeaderCtrlCl();

virtual ~CHeaderCtrlCl();

protected:

DECLARE_MESSAGE_MAP()

public:

afx_msg void OnPaint();

CStringArray m_HChar;

CString m_Format; //表示对齐类型的整型数组,0表示左对齐，1表示中间对齐，2表示右对齐

public:

int m_R;

int m_G;

int m_B;

int m_Gradient; // 画立体背景，渐变系数

float m_Height;  //表头高度，这是倍数,

int m_fontHeight; //字体高度

int m_fontWith;   //字体宽度

COLORREF m_color;

LRESULT OnLayout( WPARAM wParam, LPARAM lParam );

};

 //HeaderCtrlCl.cpp的代码如下：
#include "HeaderCtrlCl.h"
// CHeaderCtrlCl
IMPLEMENT_DYNAMIC(CHeaderCtrlCl, CHeaderCtrl)
CHeaderCtrlCl::CHeaderCtrlCl()
: m_R(171)
, m_G(199)
, m_B(235)
, m_Gradient(8)
{
m_Format = "";
m_Height = 1;
m_fontHeight = 15;
m_fontWith = 0;
m_color = RGB(0,0,0);
}
CHeaderCtrlCl::~CHeaderCtrlCl()
{
}
BEGIN_MESSAGE_MAP(CHeaderCtrlCl, CHeaderCtrl)
ON_WM_PAINT()
ON_MESSAGE(HDM_LAYOUT, OnLayout)
END_MESSAGE_MAP()
// CHeaderCtrlCl 消息处理程序
void CHeaderCtrlCl::OnPaint()
{
CPaintDC dc(this); // device context for painting
// TODO: 在此处添加消息处理程序代码
// 不为绘图消息调用 CHeaderCtrl::OnPaint()
int nItem;
nItem = GetItemCount();//得到有几个单元
for(int i = 0; i<nItem;i ++)
{
CRect tRect;
GetItemRect(i,&tRect);//得到Item的尺寸
int R = m_R,G = m_G,B = m_B;
CRect nRect(tRect);//拷贝尺寸到新的容器中
nRect.left++;//留出分割线的地方
//绘制立体背景
for(int j = tRect.top;j<=tRect.bottom;j++)
{
nRect.bottom = nRect.top+1;
CBrush _brush;
_brush.CreateSolidBrush(RGB(R, G, B));//创建画刷
dc.FillRect(&nRect,&_brush); //填充背景
_brush.DeleteObject(); //释放画刷
R-=m_Gradient;G-=m_Gradient;B-=m_Gradient;
if (R<0)R = 0;
if (G<0)G = 0;
if (B<0)B= 0;
nRect.top = nRect.bottom;
}
dc.SetBkMode(TRANSPARENT);
CFont nFont ,* nOldFont;
//dc.SetTextColor(RGB(250,50,50));
dc.SetTextColor(m_color);
nFont.CreateFont(m_fontHeight,m_fontWith,0,0,0,FALSE,FALSE,0,0,0,0,0,0,_TEXT("宋体"));//创建字体
nOldFont = dc.SelectObject(&nFont);
UINT nFormat = 1;
if (m_Format[i]=='0')
{
nFormat = DT_LEFT;
tRect.left+=3;
}
else if (m_Format[i]=='1')
{
nFormat = DT_CENTER;
}
else if (m_Format[i]=='2')
{
nFormat = DT_RIGHT;
tRect.right-=3;
}
//将文字显示在一个适合的高度位置
TEXTMETRIC metric;
dc.GetTextMetrics(&metric);
int ofst = 0;
ofst = tRect.Height() - metric.tmHeight;
tRect.OffsetRect(0,ofst/2);
  dc.DrawText(m_HChar[i],&tRect,nFormat);
dc.SelectObject(nOldFont);
nFont.DeleteObject(); //释放字体
}
//画头部剩余部分(没有标题的那部分)
CRect rtRect;
CRect clientRect;
GetItemRect(nItem - 1,rtRect);
GetClientRect(clientRect); //当前(CHeaderCtrl)控件的大小
rtRect.left = rtRect.right+1;
rtRect.right = clientRect.right;
int R = m_R,G = m_G,B = m_B;
CRect nRect(rtRect);
//绘制立体背景
for(int j = rtRect.top;j<=rtRect.bottom;j++)
{
nRect.bottom = nRect.top+1;
CBrush _brush;
_brush.CreateSolidBrush(RGB(R,G,B));//创建画刷
dc.FillRect(&nRect,&_brush); //填充背景
_brush.DeleteObject(); //释放画刷
R-=m_Gradient;G-=m_Gradient;B-=m_Gradient;
if (R<0)R = 0;
if (G<0)G = 0;
if (B<0)B= 0;
nRect.top = nRect.bottom;
}
}
LRESULT CHeaderCtrlCl::OnLayout( WPARAM wParam, LPARAM lParam )
{
LRESULT lResult = CHeaderCtrl::DefWindowProc(HDM_LAYOUT, 0, lParam);
HD_LAYOUT &hdl = *( HD_LAYOUT * ) lParam;
RECT *prc = hdl.prc;
WINDOWPOS *pwpos = hdl.pwpos;
//表头高度为原来1.5倍，如果要动态修改表头高度的话，将1.5设成一个全局变量
int nHeight = (int)(pwpos->cy * m_Height);
pwpos->cy = nHeight;
prc->top = nHeight;
return lResult;
}
2. 表的修改
　　新建一个MFC类CListCtrlCl,其基类为CListCtrl，定义一个CHeaderCtrlCl的成员变量m_Header,重载PreSubclassWindow()，在函数中修改控件类型为自绘模式，然后子类化表头。
     这里在设置表头的行高时发送了一个WM_WINDOWPOSCHANGED消息。当我们给 listctrl 发送 WM_WINDOWPOSCHANGED消息时，也就是告诉 listdctrl 控件大小、位置等发生变化，这时候 listctrl 控件就会触发 ON_WM_MEASUREITEM_REFLECT消息，当然这个是反射消息。通过映射这个消息，我们就可以改变 listctrl 控件的行高。
代码中需要手动映射 ON_WM_MEASUREITEM_REFLECT 消息，该消息的响应函数是void MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct)
///ListCtrlCl.h文件的代码如下：
#include "HeaderCtrlCl.h"
// CListCtrlCl
class CListCtrlCl : public CListCtrl
{
DECLARE_DYNAMIC(CListCtrlCl)
public:
CListCtrlCl();
virtual ~CListCtrlCl();
protected:
DECLARE_MESSAGE_MAP()
virtual void PreSubclassWindow();
protected:
virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
protected:
void MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct);
protected:
CHeaderCtrlCl m_Header; //表头
int m_nRowHeight;// 行高
CPtrList m_ptrListCol;  //保存列颜色
CPtrList m_ptrListItem; //保存Item颜色表
CPtrList m_colTextColor; //保存列字体颜色
CPtrList m_ItemTextColor; //保存单元格字体颜色
COLORREF m_color;
int m_fontHeight; // 字体高度
int m_fontWith;         // 字体宽度
public:
// 设置表头高度
void SetHeaderHeight(float Height);
// Gradient - 渐变系数，立体背景用,不用渐变设为0
void SetHeaderBKColor(int R, int G, int B, int Gradient);
int InsertColumn(int nCol, LPCTSTR lpszColumnHeading,
int nFormat = LVCFMT_LEFT, int nWidth = -1, int nSubItem = -1);
void SetHeaderFontHW(int nHeight,int nWith); //设置表头字体大小
void SetHeaderTextColor(COLORREF color);
void SetRowHeight(int nHeight); //设置行高
bool FindColColor(int col ,COLORREF &color); //查找列颜色
bool FindItemColor(int col,int row,COLORREF &color);
bool FindColTextColor(int col,COLORREF &color); //查找列字体颜色
bool FindItemTextColor(int col,int row,COLORREF &color);
void SetColColor(int col,COLORREF color);  //设置列颜色
void SetItemColor(int col,int row,COLORREF color); //设置Item颜色
void SetColTextColor(int col,COLORREF color);   //设置列文本颜色
void SetItemTextColor(int col,int row,COLORREF color);
void SetTextColor(COLORREF cr);
void SetFontHW(int nHeight,int nWith);  //设置字体的高和宽
};
//ListCtrlCl.cpp文件的代码
#include "ListCtrlCl.h"
struct stColor
{
int nRow;
int nCol;
COLORREF rgb;
};
// CListCtrlCl
IMPLEMENT_DYNAMIC(CListCtrlCl, CListCtrl)
CListCtrlCl::CListCtrlCl()
: m_nRowHeight(0)
, m_fontHeight(12)
, m_fontWith(0)
{
m_color = RGB(0,0,0);
}
CListCtrlCl::~CListCtrlCl()
{
stColor *ptemp = NULL;
while (m_ptrListCol.GetCount() > 0)
{
ptemp = (stColor *)(m_ptrListCol.RemoveHead());
if ( NULL != ptemp )
{
delete ptemp;
ptemp = NULL;
}
}
while ( m_ptrListItem.GetCount() > 0)
{
ptemp = (stColor *)(m_ptrListItem.RemoveHead());
if ( NULL != ptemp )
{
delete ptemp;
ptemp = NULL;
}
}
while ( m_colTextColor.GetCount() > 0)
{
ptemp = (stColor *)(m_colTextColor.RemoveHead());
if ( NULL != ptemp )
{
delete ptemp;
ptemp = NULL;
}
}
while ( m_ItemTextColor.GetCount() > 0)
{
ptemp = (stColor *)(m_ItemTextColor.RemoveHead());
if ( NULL != ptemp )
{
delete ptemp;
ptemp = NULL;
}
}
}
BEGIN_MESSAGE_MAP(CListCtrlCl, CListCtrl)
ON_WM_MEASUREITEM_REFLECT()
END_MESSAGE_MAP()
// CListCtrlCl 消息处理程序
void CListCtrlCl::PreSubclassWindow()
{
// TODO: 在此添加专用代码和/或调用基类
ModifyStyle(0,LVS_OWNERDRAWFIXED);
CListCtrl::PreSubclassWindow();
CHeaderCtrl *pHeader = GetHeaderCtrl();
m_Header.SubclassWindow(pHeader->GetSafeHwnd());
}
void CListCtrlCl::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
// TODO:  添加您的代码以绘制指定项
TCHAR lpBuffer[256];
LV_ITEM lvi;
lvi.mask = LVIF_TEXT | LVIF_PARAM ;
lvi.iItem = lpDrawItemStruct->itemID ;
lvi.iSubItem = 0;
lvi.pszText = lpBuffer ;
lvi.cchTextMax = sizeof(lpBuffer);
VERIFY(GetItem(&lvi));
LV_COLUMN lvc, lvcprev ;
::ZeroMemory(&lvc, sizeof(lvc));
::ZeroMemory(&lvcprev, sizeof(lvcprev));
lvc.mask = LVCF_WIDTH | LVCF_FMT;
lvcprev.mask = LVCF_WIDTH | LVCF_FMT;
CDC* pDC;
pDC = CDC::FromHandle(lpDrawItemStruct->hDC);
CRect rtClient;
GetClientRect(&rtClient);
for ( int nCol=0; GetColumn(nCol, &lvc); nCol++)
{
if ( nCol > 0 )
{
// Get Previous Column Width in order to move the next display item
GetColumn(nCol-1, &lvcprev) ;
lpDrawItemStruct->rcItem.left += lvcprev.cx ;
lpDrawItemStruct->rcItem.right += lpDrawItemStruct->rcItem.left;
}
CRect rcItem;  
if (!GetSubItemRect(lpDrawItemStruct->itemID,nCol,LVIR_LABEL,rcItem))  
continue;  
::ZeroMemory(&lvi, sizeof(lvi));
lvi.iItem = lpDrawItemStruct->itemID;
lvi.mask = LVIF_TEXT | LVIF_PARAM;
lvi.iSubItem = nCol;
lvi.pszText = lpBuffer;
lvi.cchTextMax = sizeof(lpBuffer);
VERIFY(GetItem(&lvi));
CRect rcTemp;
rcTemp = rcItem;
if (nCol==0)
{
rcTemp.left -=2;
}
if ( lpDrawItemStruct->itemState & ODS_SELECTED )
{
pDC->FillSolidRect(&rcTemp, GetSysColor(COLOR_HIGHLIGHT)) ;
pDC->SetTextColor(GetSysColor(COLOR_HIGHLIGHTTEXT)) ;
}
else
{
COLORREF color;
color = GetBkColor();
pDC->FillSolidRect(rcTemp,color);
if (FindColColor(nCol,color))
{
pDC->FillSolidRect(rcTemp,color);
}
if (FindItemColor(nCol,lpDrawItemStruct->itemID,color))
{
pDC->FillSolidRect(rcTemp,color);
}
//pDC->SetTextColor(m_color);
}
pDC->SelectObject(GetStockObject(DEFAULT_GUI_FONT));
UINT   uFormat    = DT_CENTER ;
if (m_Header.m_Format[nCol]=='0')
{
uFormat = DT_LEFT;
}
else if (m_Header.m_Format[nCol]=='1')
{
uFormat = DT_CENTER;
}
else if (m_Header.m_Format[nCol]=='2')
{
uFormat = DT_RIGHT;
}
TEXTMETRIC metric;
pDC->GetTextMetrics(&metric);
int ofst;
ofst = rcItem.Height() - metric.tmHeight;
rcItem.OffsetRect(0,ofst/2);
pDC->SetTextColor(m_color);
COLORREF color;
if (FindColTextColor(nCol,color))
{
pDC->SetTextColor(color);
}
if (FindItemTextColor(nCol,lpDrawItemStruct->itemID,color))
{
pDC->SetTextColor(color);
}
CFont nFont ,* nOldFont;
nFont.CreateFont(m_fontHeight,m_fontWith,0,0,0,FALSE,FALSE,0,0,0,0,0,0,_TEXT("宋体"));//创建字体
nOldFont = pDC->SelectObject(&nFont);
DrawText(lpDrawItemStruct->hDC, lpBuffer, strlen(lpBuffer),
&rcItem, uFormat) ;
pDC->SelectStockObject(SYSTEM_FONT) ;
}
}
void CListCtrlCl::MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct)
{
if (m_nRowHeight>0)
{
lpMeasureItemStruct->itemHeight = m_nRowHeight;
}
}
int CListCtrlCl::InsertColumn(int nCol, LPCTSTR lpszColumnHeading, int nFormat /* = LVCFMT_LEFT */, int nWidth /* = -1 */, int nSubItem /* = -1 */)
{
m_Header.m_HChar.Add(lpszColumnHeading);
if (nFormat==LVCFMT_LEFT)
{
m_Header.m_Format = m_Header.m_Format + "0";
}
else if (nFormat==LVCFMT_CENTER)
{
m_Header.m_Format = m_Header.m_Format + "1";
}
else if (nFormat==LVCFMT_RIGHT)
{
m_Header.m_Format = m_Header.m_Format + "2";
}
else
{
m_Header.m_Format = m_Header.m_Format + "1";
}
return CListCtrl::InsertColumn(nCol,lpszColumnHeading,nFormat,nWidth,nSubItem);
}
// Gradient - 渐变系数，立体背景用,不用渐变设为0
void CListCtrlCl::SetHeaderBKColor(int R, int G, int B, int Gradient) //设置表头背景色
{
m_Header.m_R = R;
m_Header.m_G = G;
m_Header.m_B = B;
m_Header.m_Gradient = Gradient;
}
// 设置表头高度
void CListCtrlCl::SetHeaderHeight(float Height) //设置表头高度
{
m_Header.m_Height = Height;
}
bool CListCtrlCl::FindColColor(int col,COLORREF &color) //查找列颜色
{
int flag = 0;
for (POSITION pos = m_ptrListCol.GetHeadPosition();pos!=NULL;)
{
stColor *pColor = (stColor*)m_ptrListCol.GetNext(pos);
if (pColor->nCol==col)
{
flag = 1;
color = pColor->rgb;
break;
}
}
if (1==flag)
{
return true;
}
return false;
}
bool CListCtrlCl::FindItemColor(int col,int row,COLORREF &color) //查找颜色
{
int flag = 0;
for (POSITION pos = m_ptrListItem.GetHeadPosition();pos!=NULL;)
{
stColor *pColor = (stColor*)m_ptrListItem.GetNext(pos);
if (pColor->nCol==col&&pColor->nRow==row)
{
flag = 1;
color = pColor->rgb;
break;
}
}
if (1==flag)
{
return true;
}
return false;
}
void CListCtrlCl::SetColColor(int col,COLORREF color) //设置列颜色
{
stColor *pColor  = new stColor;
pColor->nCol = col;
pColor->rgb = color;
m_ptrListCol.AddTail(pColor);
}
void CListCtrlCl::SetItemColor(int col,int row,COLORREF color) //设置格子颜色
{
stColor *pColor  = new stColor;
pColor->nCol = col;
pColor->nRow = row;
pColor->rgb = color;
m_ptrListItem.AddTail(pColor);
}
void CListCtrlCl::SetRowHeight(int nHeight) // 设置行高
{
m_nRowHeight = nHeight;
CRect rcWin;
GetWindowRect(&rcWin);
WINDOWPOS wp;
wp.hwnd = m_hWnd;
wp.cx = rcWin.Width();
wp.cy = rcWin.Height();
wp.flags = SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOOWNERZORDER | SWP_NOZORDER;
SendMessage(WM_WINDOWPOSCHANGED, 0, (LPARAM)&wp);
}
void CListCtrlCl::SetHeaderFontHW(int nHeight,int nWith) //设置头部字体宽和高
{
m_Header.m_fontHeight = nHeight;
m_Header.m_fontWith = nWith;
}
void CListCtrlCl::SetHeaderTextColor(COLORREF color) //设置头部字体颜色
{
m_Header.m_color = color;
}
void CListCtrlCl::SetTextColor(COLORREF cr)  //设置字体颜色
{
m_color = cr;
}
void CListCtrlCl::SetFontHW(int nHeight,int nWith) //设置字体高和宽
{
m_fontHeight = nHeight;
m_fontWith = nWith;
}
void CListCtrlCl::SetColTextColor(int col,COLORREF color)
{
stColor *pColor = new stColor;
pColor->nCol = col;
pColor->rgb = color;
m_colTextColor.AddTail(pColor);
}
bool CListCtrlCl::FindColTextColor(int col,COLORREF &color)
{
int flag = 0;
for (POSITION pos = m_colTextColor.GetHeadPosition();pos!=NULL;)
{
stColor *pColor = (stColor*)m_colTextColor.GetNext(pos);
if (pColor->nCol==col)
{
flag = 1;
color = pColor->rgb;
break;
}
}
if (1==flag)
{
return true;
}
return false;
}
bool CListCtrlCl::FindItemTextColor(int col,int row,COLORREF &color)
{
int flag = 0;
for (POSITION pos = m_ItemTextColor.GetHeadPosition();pos!=NULL;)
{
stColor *pColor = (stColor*)m_ItemTextColor.GetNext(pos);
if (pColor->nCol==col&&pColor->nRow==row)
{
flag = 1;
color = pColor->rgb;
break;
}
}
if (1==flag)
{
return true;
}
return false;
}
void CListCtrlCl::SetItemTextColor(int col,int row,COLORREF color)
{
stColor *pColor = new stColor;
pColor->nCol = col;
pColor->nRow = row;
pColor->rgb = color;
m_ItemTextColor.AddTail(pColor);
}
测试：在对话框的OnInitDialog()中添加初始化代码:
m_ListCtrl.SetColColor(0,RGB(10,150,20)); //设置列背景色
m_ListCtrl.SetColColor(2,RGB(30,100,90)); //设置列背景色
m_ListCtrl.SetBkColor(RGB(50,10,10));        //设置背景色
m_ListCtrl.SetItemColor(1,1,RGB(100,100,10)); //设置指定单元背景色
m_ListCtrl.SetRowHeight(25);               //设置行高度
m_ListCtrl.SetHeaderHeight(1.5);          //设置头部高度
m_ListCtrl.SetHeaderFontHW(16,0);         //设置头部字体高度,和宽度,0表示缺省，自适应
m_ListCtrl.SetHeaderTextColor(RGB(255,200,100)); //设置头部字体颜色
m_ListCtrl.SetTextColor(RGB(0,255,255));  //设置文本颜色
m_ListCtrl.SetHeaderBKColor(100,255,100,8); //设置头部背景色
m_ListCtrl.SetFontHW(15,0);               //设置字体高度，和宽度,0表示缺省宽度
m_ListCtrl.SetColTextColor(2,RGB(255,255,100)); //设置列文本颜色
m_ListCtrl.SetItemTextColor(3,1,RGB(255,0,0));  //设置单元格字体颜色
m_ListCtrl.InsertColumn(0,_T("名字"),LVCFMT_CENTER,55);
m_ListCtrl.InsertColumn(1,_T("身高"),LVCFMT_CENTER,60);
m_ListCtrl.InsertColumn(2,_T("体重"),LVCFMT_CENTER,60);
m_ListCtrl.InsertColumn(3,_T("测量时间"),LVCFMT_CENTER,180);
m_ListCtrl.InsertItem(0,"张三");
m_ListCtrl.SetItemText(0,1,"178CM");
m_ListCtrl.SetItemText(0,2,"70KG");
m_ListCtrl.SetItemText(0,3,"2009年1月15日23时40分");
m_ListCtrl.InsertItem(1,"王五");
m_ListCtrl.SetItemText(1,1,"178cm");
m_ListCtrl.SetItemText(1,2,"70kg");
m_ListCtrl.SetItemText(1,3,"2009年1月15日23时40分");
m_ListCtrl.InsertItem(2,"阿花");
m_ListCtrl.SetItemText(2,1,"168cm");
m_ListCtrl.SetItemText(2,2,"60kg");
m_ListCtrl.SetItemText(2,3,"2009年1月15日23时40分");
SetWindowLong(m_ListCtrl.m_hWnd ,GWL_EXSTYLE,WS_EX_CLIENTEDGE);
m_ListCtrl.SetExtendedStyle(LVS_EX_GRIDLINES);                     //设置扩展风格为网格
::SendMessage(m_ListCtrl.m_hWnd, LVM_SETEXTENDEDLISTVIEWSTYLE,
LVS_EX_FULLROWSELECT, LVS_EX_FULLROWSELECT);

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