VC中在listctrl中嵌入进度条，截图如下：
其实要实现这个非常容易，以下是自绘ListCtrl的代码，首先继承CListCtrl，然后增加函数OnCustomDraw： void CProcessList::OnCustomDraw(NMHDR *pNMHDR, LRESULT *pResult) { //draw each item.set txt color,bkcolor.... 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 (pLVCD->nmcd.dwDrawStage == CDDS_PREPAINT) { *pResult = CDRF_NOTIFYITEMDRAW; } else if (pLVCD->nmcd.dwDrawStage == CDDS_ITEMPREPAINT) { // This is the notification message for an item. We’ll request // notifications before each subitem’s prepaint stage. *pResult = CDRF_NOTIFYSUBITEMDRAW; } else if (pLVCD->nmcd.dwDrawStage == (CDDS_ITEMPREPAINT | CDDS_SUBITEM)) { // 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. int nItem = static_cast<int> (pLVCD->nmcd.dwItemSpec); int nSubItem = pLVCD->iSubItem; if(nSubItem != 2)//这里我只重绘第二列 return;
COLORREF crText = ::GetSysColor(COLOR_WINDOWFRAME); COLORREF crBkgnd = ::GetSysColor(COLOR_WINDOW); CDC* pDC = CDC::FromHandle(pLVCD->nmcd.hdc); CRect rect; GetSubItemRect(nItem, nSubItem, LVIR_BOUNDS, rect); if (GetItemState(nItem, LVIS_SELECTED)) DrawText(nItem, nSubItem, pDC, ::GetSysColor(COLOR_HIGHLIGHT), ::GetSysColor(COLOR_HIGHLIGHT), rect); else DrawText(nItem, nSubItem, pDC, crText, crBkgnd, rect);
*pResult = CDRF_SKIPDEFAULT; // We’ve painted everything. } }
然后为该函数增加消息映射(#add 其实是消息反射)： ON_NOTIFY_REFLECT(NM_CUSTOMDRAW, OnCustomDraw) 最后我们为画进度条而努力，这里程序中把进度存在ItemData中。 void CProcessList::DrawText(int nItem, int nSubItem, CDC *pDC, COLORREF crText, COLORREF crBkgnd, CRect &rect) { ASSERT(pDC); pDC->FillSolidRect(&rect, crBkgnd); int nProcess = GetItemData(nItem); CRect procRect = rect; pDC->Rectangle(procRect);
procRect.left += 1; procRect.bottom -= 1; procRect.top += 1; procRect.right = procRect.left + rect.Width() * nProcess / 100; CBrush brush(RGB(255,0,0)); pDC->FillRect(&procRect, &brush); CString str; str.Format("%d%%", nProcess); if (!str.IsEmpty()) { UINT nFormat = DT_VCENTER | DT_SINGLELINE | DT_CENTER; pDC->SetBkMode(TRANSPARENT); pDC->SetTextColor(crText); pDC->SetBkColor(crBkgnd); pDC->DrawText(str, &rect, nFormat); } }
上面用到一个结构，是存放于ItemData中用来表示进度和步长的： typedef struct _ProcessLCI_Data_ { int nProportion; int nStep; } PLCIDATA, *LPPLCIDATA;
接下来就是在容器中使用继承的ListCtrl了，这里使用对话框，在一个定时器中模拟进度的变化（其它的初始化和清除就不罗嗦了）：
void CListCtrlProcessDlg::OnTimer(UINT nIDEvent) { if(nIDEvent == TIMER_PROCESS) { BOOL bPaint = FALSE; for(int i = 0; i < m_listProcess.GetItemCount(); ++i) { LPPLCIDATA pIData = (LPPLCIDATA)m_listProcess.GetItemData(i); if(pIData->nProportion >= 100) continue; bPaint = TRUE; if(pIData->nProportion + pIData->nStep > 100) { pIData->nProportion = 100; } else { pIData->nProportion += pIData->nStep; } } if(bPaint) m_listProcess.Invalidate(FALSE); } CDialog::OnTimer(nIDEvent); }
这里有个奇怪的问题，在VC6中不调上面的Invalidate()，只要TIMMER发生，进度条都会自动刷新。但在VC71上编译，如果不调Invalidate()，根本不刷新？？？不解！！！ 从运行的结果看，效果还不错。VC6编译的就是满100%后进度条还是不停的闪烁；而VC71就不会了，因为没有调Invalidate()？？？
怎么样？很简单吧，其实使用VC开发界面也非常迅速的，虽然还是觉得MFC的封装有JAVA界面库封装得那么好该多好啊