完美的CListCtrl控件自绘
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自绘一个item我相信大部分人都在10分钟内能搞定
但是绘制非item部分的区域，同学们就傻眼了，不知道如何下手
CListCtrl的绘制机制在windows里做了一个优化，就是一个绘制循环通知过程
之所以不在OnPaint中画是考虑效率上的原因，好了我们看下这个绘制循环：
CDDS_PREERASE 准备开始擦除循环
CDDS_POSTERASE 擦除循环结束
CDDS_PREPAINT 准备开始绘制循环
CDDS_POSTPAINT 绘制循环结束
CDDS_ITEM 指定dwItemSpec, uItemState, lItemlParam参数有效
CDDS_ITEMPREERASE 准备开始列表项擦除
CDDS_ITEMPREPAINT 准备开始列表项绘制
CDDS_SUBITEM 指定列表子项
CDDS_ITEMPOSTERASE 列表项擦除结束
CDDS_ITEMPOSTPAINT 列表项绘制结束
我们这里主要是响应NM_CUSTOMDRAW来实现绘制的
在CDDS_POSTPAINT绘制循环结束时我们可以开始绘制非item的部分，如何计算非item的空间请看下面代码：
//SkinListCtrl.h
- #pragma once
- // CSkinListCtrl
- class CSkinListCtrl : public CListCtrl
- {
- DECLARE_DYNAMIC(CSkinListCtrl)
- public:
- unsigned int LIST_ITEM_HEIGHT;
- public:
- CSkinListCtrl();
- virtual ~CSkinListCtrl();
- protected:
- DECLARE_MESSAGE_MAP()
- public:
- afx_msg void OnNMCustomdraw(NMHDR *pNMHDR, LRESULT *pResult);
- protected:
- void Init();
- virtual void DrawSubItem(CDC *pDC, int nItem, int nSubItem, CRect &rSubItem, bool bSelected, bool bFocus);
- virtual void DrawRemainSpace(LPNMLVCUSTOMDRAW lpnmcd);
- virtual void draw_row_bg(CDC *pDC, RECT rc, bool bSelected, bool bFocus,int nRow);
- virtual void draw_row_bg(CDC *pDC, RECT rc, bool bSelected, bool bFocus, bool bOdd);
- void InvalidateItem(int nItem);
- public:
- afx_msg void OnLvnItemchanged(NMHDR *pNMHDR, LRESULT *pResult);
- virtual void PreSubclassWindow();
- virtual void DrawItem(LPDRAWITEMSTRUCT /*lpDrawItemStruct*/);
- };
//SkinListCtrl.cpp
- // SkinListCtrl.cpp : implementation file
- //
- #include "stdafx.h"
- #include "SkinListCtrl.h"
- // CSkinListCtrl
- IMPLEMENT_DYNAMIC(CSkinListCtrl, CListCtrl)
- CSkinListCtrl::CSkinListCtrl()
- {
- LIST_ITEM_HEIGHT = 20;
- }
- CSkinListCtrl::~CSkinListCtrl()
- {
- }
- BEGIN_MESSAGE_MAP(CSkinListCtrl, CListCtrl)
- ON_NOTIFY_REFLECT(NM_CUSTOMDRAW, &CSkinListCtrl::OnNMCustomdraw)
- //ON_NOTIFY_REFLECT(LVN_ITEMCHANGED, &CSkinListCtrl::OnLvnItemchanged)
- END_MESSAGE_MAP()
- // CSkinListCtrl message handlers
- void CSkinListCtrl::OnNMCustomdraw(NMHDR *pNMHDR, LRESULT *pResult)
- {
- LPNMLVCUSTOMDRAW lpnmcd = (LPNMLVCUSTOMDRAW) pNMHDR;
- if (lpnmcd ->nmcd.dwDrawStage == CDDS_PREPAINT)
- {
- *pResult = CDRF_NOTIFYITEMDRAW | CDRF_NOTIFYPOSTPAINT;
- return;
- }
- else if (lpnmcd->nmcd.dwDrawStage == CDDS_ITEMPREPAINT)
- {
- /*CRect rSubItem, rectClient;
- GetItemRect(lpnmcd->nmcd.dwItemSpec, &rSubItem, LVIR_LABEL);
- GetClientRect(&rectClient);
- rSubItem.left = 0;
- rSubItem.right = rectClient.right;
- rSubItem.NormalizeRect();
- bool bSelected = false;
- if (GetItemState(lpnmcd->nmcd.dwItemSpec, LVIS_SELECTED))
- {
- bSelected = true;
- }
- bool bFocus = false;
- HWND hWndFocus = ::GetFocus();
- if (::IsChild(m_hWnd,hWndFocus) || m_hWnd == hWndFocus)
- {
- bFocus = true;
- }
- CDC dc;
- dc.Attach(lpnmcd->nmcd.hdc);
- draw_row_bg(&dc, rSubItem, bSelected , bFocus, (int) lpnmcd->nmcd.dwItemSpec);
- dc.Detach();*/
- *pResult = CDRF_NOTIFYSUBITEMDRAW;
- return;
- }
- else if (lpnmcd ->nmcd.dwDrawStage == (CDDS_SUBITEM | CDDS_ITEMPREPAINT))
- {
- int iItem = lpnmcd->nmcd.dwItemSpec;
- int iSubItem = lpnmcd->iSubItem;
- if (iItem >= 0 && iSubItem >= 0)
- {
- CRect rSubItem;
- HDC hDC = lpnmcd->nmcd.hdc;
- GetSubItemRect(iItem, iSubItem, LVIR_LABEL,rSubItem);
- if (iSubItem == 0)
- {
- rSubItem.left = 0;
- }
- bool bSelected = false;
- if (GetItemState(iItem, LVIS_SELECTED))
- {
- bSelected = true;
- }
- bool bFocus = false;
- CWnd *pWndFocus = GetFocus();
- if (IsChild(pWndFocus) || pWndFocus == this)
- {
- bFocus = true;
- }
- rSubItem.NormalizeRect();
- CDC dc;
- dc.Attach(lpnmcd->nmcd.hdc);
- DrawSubItem(&dc,iItem,iSubItem,rSubItem,bSelected,bFocus);
- dc.Detach();
- *pResult = CDRF_SKIPDEFAULT;
- return;
- }
- }
- else if (lpnmcd ->nmcd.dwDrawStage == CDDS_POSTPAINT)
- {
- DrawRemainSpace(lpnmcd);
- *pResult = CDRF_SKIPDEFAULT;
- return;
- }
- *pResult = 0;
- }
- // overwrite:
- void CSkinListCtrl::DrawSubItem(CDC *pDC, int nItem, int nSubItem, CRect &rSubItem, bool bSelected, bool bFocus)
- {
- pDC->SetBkMode(TRANSPARENT);
- pDC->SetTextColor(RGB(0, 0, 0));
- CFont font;
- font.CreateFont(12, // nHeight
- 0, // nWidth
- 0, // nEscapement
- 0, // nOrientation
- FW_NORMAL, // nWeight
- FALSE, // bItalic
- FALSE, // bUnderline
- 0, // cStrikeOut
- ANSI_CHARSET, // nCharSet
- OUT_DEFAULT_PRECIS, // nOutPrecision
- CLIP_DEFAULT_PRECIS, // nClipPrecision
- DEFAULT_QUALITY, // nQuality
- DEFAULT_PITCH | FF_SWISS, // nPitchAndFamily
- _T("宋体"));
- pDC->SelectObject(&font);
- CString strText;
- strText = GetItemText(nItem, nSubItem);
- draw_row_bg(pDC, rSubItem, bSelected, bFocus, nItem);
- pDC->DrawText(strText, strText.GetLength(), &rSubItem, DT_SINGLELINE | DT_RIGHT | DT_VCENTER | DT_END_ELLIPSIS);
- }
- // 画剩余部分
- void CSkinListCtrl::DrawRemainSpace(LPNMLVCUSTOMDRAW lpnmcd)
- {
- int nTop = lpnmcd->nmcd.rc.top;
- int nCount = GetItemCount();
- if (nCount > 0)
- {
- CRect rcItem;
- GetItemRect(nCount - 1, &rcItem, LVIR_LABEL);
- nTop = rcItem.bottom;
- }
- CRect rectClient;
- GetClientRect(&rectClient);
- if (nTop < lpnmcd->nmcd.rc.bottom) // 有剩余
- {
- CRect rcRemain = lpnmcd->nmcd.rc;
- rcRemain.top = nTop;
- rcRemain.right = rectClient.right;
- int nRemainItem = rcRemain.Height() / LIST_ITEM_HEIGHT;
- if (rcRemain.Height() % LIST_ITEM_HEIGHT)
- {
- nRemainItem++;
- }
- int pos = GetScrollPos(SB_HORZ);
- CDC dc;
- dc.Attach(lpnmcd->nmcd.hdc);
- for (int i = 0; i < nRemainItem; ++i)
- {
- CRect rcItem;
- rcItem.top = rcRemain.top + i * LIST_ITEM_HEIGHT;
- rcItem.left = rcRemain.left;
- rcItem.right = rcRemain.right;
- rcItem.bottom = rcItem.top + LIST_ITEM_HEIGHT;
- int nColumnCount = GetHeaderCtrl()->GetItemCount();
- CRect rcSubItem;
- for (int j = 0; j < nColumnCount; ++j)
- {
- GetHeaderCtrl()->GetItemRect(j, &rcSubItem);
- rcSubItem.top = rcItem.top;
- rcSubItem.bottom = rcItem.bottom;
- rcSubItem.OffsetRect(-pos, 0);
- if(rcSubItem.right < rcRemain.left || rcSubItem.left > rcRemain.right)
- continue;
- draw_row_bg(&dc, rcSubItem, false, false, i + nCount);
- }
- /*if (rcSubItem.right<rectClient.right)
- {
- rcSubItem.left=rcSubItem.right;
- rcSubItem.right=rectClient.right;
- draw_row_bg(&dc, rcSubItem, false, false, i+nCount);
- }*/
- }
- dc.Detach();
- }
- }
- void CSkinListCtrl::draw_row_bg(CDC *pDC, RECT rc, bool bSelected, bool bFocus,int nRow)
- {
- bool bOdd = (nRow % 2 == 0 ? true : false);
- CRect rect = rc;
- if (rect.Width() == 0)
- {
- return;
- }
- draw_row_bg(pDC, rc, bSelected,bFocus,bOdd);
- }
- void CSkinListCtrl::draw_row_bg(CDC *pDC, RECT rc, bool bSelected, bool bFocus, bool bOdd)
- {
- CRect rect = rc;
- if (rect.Width() == 0)
- {
- return;
- }
- int nSave = pDC->SaveDC();
- if (bSelected)
- {
- if (bFocus)
- {
- CBrush selectBrush;
- selectBrush.CreateSolidBrush(RGB(203, 223, 239));
- pDC->FillRect(&rc, &selectBrush);
- }
- else
- {
- CBrush selectNoFocusBrush;
- selectNoFocusBrush.CreateSolidBrush(RGB(206, 206, 206));
- pDC->FillRect(&rc, &selectNoFocusBrush);
- }
- }
- else if (bOdd)
- {
- CBrush oddBrush;
- oddBrush.CreateSolidBrush(RGB(255, 255, 255));
- pDC->FillRect(&rc, &oddBrush);
- }
- else
- {
- CBrush normalBrush;
- normalBrush.CreateSolidBrush(RGB(243, 243, 243));
- pDC->FillRect(&rc, &normalBrush);
- }
- // 画竖线
- CPen pen;
- pen.CreatePen(PS_SOLID, 1, RGB(218, 218, 218));
- pDC->SelectObject(&pen);
- pDC->MoveTo(rc.right - 1, rc.top);
- pDC->LineTo(rc.right - 1, rc.bottom);
- // 画选中的底部分割线
- if (bSelected)
- {
- CPen bottomPen;
- bottomPen.CreatePen(PS_SOLID, 1, RGB(255, 255, 255));
- pDC->SelectObject(&bottomPen);
- pDC->MoveTo(rc.left, rc.bottom - 1);
- pDC->LineTo(rc.right, rc.bottom - 1);
- }
- pDC->RestoreDC(nSave);
- }
- void CSkinListCtrl::Init()
- {
- LOGFONT logfont;
- memset(&logfont, 0, sizeof(logfont));
- logfont.lfWeight = FW_NORMAL;
- logfont.lfCharSet = GB2312_CHARSET;
- _tcscpy_s(logfont.lfFaceName, LF_FACESIZE, _T("宋体"));
- logfont.lfHeight = -(LIST_ITEM_HEIGHT-1);
- CFont font;
- font.CreateFontIndirect(&logfont);
- SetFont(&font);
- font.Detach();
- }
- void CSkinListCtrl::OnLvnItemchanged(NMHDR *pNMHDR, LRESULT *pResult)
- {
- LPNMLISTVIEW pNMLV = reinterpret_cast<LPNMLISTVIEW>(pNMHDR);
- if (pNMLV->uChanged & LVIF_STATE)
- {
- if (((pNMLV->uOldState & LVIS_SELECTED) != (pNMLV->uNewState & LVIS_SELECTED))
- || ((pNMLV->uOldState & LVIS_STATEIMAGEMASK) != (pNMLV->uNewState & LVIS_STATEIMAGEMASK)))
- {
- InvalidateItem(pNMLV->iItem);
- }
- }
- *pResult = 0;
- }
- void CSkinListCtrl::InvalidateItem(int nItem)
- {
- CRect rcClient;
- GetClientRect(&rcClient);
- CRect rcItem;
- GetItemRect(nItem, &rcItem, LVIR_BOUNDS);
- rcItem.left = rcClient.left;
- rcItem.right = rcClient.right;
- InvalidateRect(&rcItem,FALSE);
- }
- void CSkinListCtrl::PreSubclassWindow()
- {
- Init();
- CListCtrl::PreSubclassWindow();
- }
- void CSkinListCtrl::DrawItem(LPDRAWITEMSTRUCT /*lpDrawItemStruct*/)
- {
- }
看效果图：
看到了吧 ，非item部分我们也绘制出来了，右边问号部分我这里没做绘制，这部分也可以绘制的，可以把斑马线顶到最右边
创建CListCtrl时样式建议如下：
- DWORD dwExtentStyle = m_list.GetExtendedStyle();
- m_list.SetExtendedStyle(dwExtentStyle|LVS_EX_FULLROWSELECT|LVS_EX_DOUBLEBUFFER);
这里已经画有网格线进去了，样式里就不要加这个网格线样式了，就是不用加LVS_EX_GRIDLINES 样式
OK，后面我们再来画下headerctrl就很好看了，下一篇中给出源码，并结合到CSkinListCtrl中
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