编辑子项的CListCtrl类.doc

编辑子项的CListCtrl类作者：Nobita关键词：可编辑子项 CListCtrl摘 要：本文对CListCtrl控件进行了一个扩展，使它即可以编辑主项(Item)，又可以编辑子项(SubItem)，并尽量符合CListCtrl的操作习惯。 一、说明大家都知道在MFC中通过给CListCtrl设置LVS_EDITLABELS属性，并且在程序中响应控件的LVN_ENDLABELEDIT消息可以修改列表控件每一行的第一项，也就是主项(Item)。代码如下：void CEditListCtrlSampleDlg:OnEndlabeleditList1(NMHDR* pNMHDR, LRESULT* pResult) LV_DISPINFO* pDispInfo = (LV_DISPINFO*)pNMHDR;/ TODO: Add your control notification handler code here*pResult = TRUE; /TRUE值表示可以修改主项，FALSE值表示不修改主项但是让人郁闷的是，微软留了一手，CListCtrl不支持直接修改子项(SubItem)。无奈之下只好自力更生，对CListCtrl进行扩展。_nmcd.dwDrawStage = CDDS_PREPAINT)*pResult = CDRF_NOTIFYITEMDRAW;else if (pNMLVCustomDraw-nmcd.dwDrawStage = CDDS_ITEMPREPAINT)/ This is the notification message for an item. Well request/ notifications before each subitems prepaint stage.*pResult = CDRF_NOTIFYSUBITEMDRAW;else if (pNMLVCustomDraw-nmcd.dwDrawStage = (CDDS_ITEMPREPAINT | CDDS_SUBITEM)/当前要绘制的主项标识符和子项标识符int iItem = (int)pNMLVCustomDraw-nmcd.dwItemSpec;int iSubItem = pNMLVCustomDraw-iSubItem;CDC* pDC = CDC:FromHandle(pNMLVCustomDraw-nmcd.hdc);CString strItemText = GetItemText(iItem, iSubItem);CRect rcItem, rcText;GetSubItemRect(iItem, iSubItem, LVIR_LABEL, rcItem);rcText = rcItem;CSize size = pDC-GetTextExtent(strItemText);if(strItemText = _T()size.cx = 41; /设置文本高亮矩形rcText.left += 4;rcText.right = rcText.left + size.cx + 6;if(rcText.right rcItem.right)rcText.right = rcItem.right;COLORREF crOldTextColor = pDC-GetTextColor();/绘制项焦点/高亮效果if(m_bFocus)if(m_iItem = iItem) & (m_iSubItem = iSubItem)if(m_bHighLight)pDC-SetTextColor(:GetSysColor(COLOR_HIGHLIGHTTEXT);pDC-FillSolidRect(&rcText, :GetSysColor(COLOR_HIGHLIGHT);pDC-DrawFocusRect(&rcText);/绘制项文本rcItem.left += 6;pDC-DrawText(strItemText, &rcItem, DT_LEFT | DT_VCENTER | DT_SINGLELINE | DT_END_ELLIPSIS | DT_NOCLIP);pDC-SetTextColor(crOldTextColor);*pResult = CDRF_SKIPDEFAULT;/ Weve painted everything.单击一次文本高亮，再单击一次文本开始编辑在WM_LBUTTONDOWN消息处理中实现：void CEditListCtrl:OnLButtonDown(UINT nFlags, CPoint point) m_bFocus = TRUE;LVHITTESTINFO lvhit;lvhit.pt = point;int item = SubItemHitTest(&lvhit);/if (over a item/subitem)if (item != -1 & (lvhit.flags & LVHT_ONITEM)CListCtrl:OnLButtonDown(nFlags, point);if(m_bHighLight & m_iItem = lvhit.iItem & m_iSubItem = lvhit.iSubItem) /第二次单击EditLabel(m_iItem);return;else /第一次单击m_iItem = lvhit.iItem;m_iSubItem = lvhit.iSubItem;m_bHighLight = TRUE;elseif(m_edtItemEdit.m_hWnd = NULL) /未出现文本编辑框时m_bHighLight = FALSE;CListCtrl:OnLButtonDown(nFlags, point);Invalidate(); /强制重绘控件关键的一步，对项文本进行编辑。在以上代码中当执行到EditLabel时将会产生一个编辑框，这时需要将它进行子类化处理，以控制它出现的位置。void CEditListCtrl:OnBeginlabeledit(NMHDR* pNMHDR, LRESULT* pResult) LV_DISPINFO* pDispInfo = (LV_DISPINFO*)pNMHDR;if (m_iSubItem = 0) ASSERT(m_iItem = pDispInfo-item.iItem);CRect rcSubItem;GetSubItemRect( pDispInfo-item.iItem, m_iSubItem, LVIR_BOUNDS, rcSubItem);/get edit control and subclassHWND hWnd= (HWND)SendMessage(LVM_GETEDITCONTROL);ASSERT(hWnd != NULL);VERIFY(m_edtItemEdit.SubclassWindow(hWnd);/move edit control text 4 pixel to the right of org label,/as Windows does it.编辑框定位m_edtItemEdit.m_iXPos = rcSubItem.left + 4;m_edtItemEdit.SetWindowText(GetItemText(pDispInfo-item.iItem, m_iSubItem);*pResult = 0;void CEditListCtrl:OnEndlabeledit(NMHDR* pNMHDR, LRESULT* pResult) LV_DISPINFO* pDispInfo = (LV_DISPINFO*)pNMHDR;LV_ITEM*plvItem = &pDispInfo-item;if (m_iSubItem = 0)if (plvItem-pszText != NULL )SetItemText(plvItem-iItem,m_iSubItem, plvItem-pszText);VERIFY(m_edtItemEdit.UnsubclassWindow()!=NULL);*pResult = 0;/编辑文本时对控件父窗口操作(如单击其