ListCtrl控件数据动态修改(List Control).doc

：/KB/list/editing_subitems_in_listcontrol.aspx另自己写了一篇关于一些ListControl的基本操作（如何获得一项的值，如何选中一行而不是一列等）请查看：/anglecloudy/blog/item/d969fd29138093f999250a97.htmlEditing Sub-Items in List ControlBy s.prabhakarreddy本文全面介绍了如何编辑List Control里面的任何子项介绍内容有点多，译出来也没多大意思，大致就是说一个VC程序员会常常碰到List Control，List Control有很多方法可以显示数据，可List Control里默认的没有编辑功能，故在此智短文里，那个牛叉的人教你怎么实现这个功能。这篇文章是基于VC MFC滴，用别的功具的娃们当然也可以看看，呵呵，不多说，先实现图上ok exit两个按钮：void CMultipleColumnsDlg:OK() CDialog:EndDialog (0); / Add this linevoid CMultipleColumnsDlg:OnExit() CDialog:EndDialog (0); / Add this line接下来添加一个ListCtrl控件，记得把ListCtrl的style设置成Report，这个是为了实现我们要多行显示的功能然后增加一个文本框Edit Box去掉它的Border style属性增加一个InsertItems() 成员函数，用来写入ListControl的显示内容void CMultipleColumnsDlg:InsertItems() HWND hWnd = :GetDlgItem(m_hWnd, IDC_LIST1); / Set the LVCOLUMN structure with the required / column information LVCOLUMN list; list.mask = LVCF_TEXT |LVCF_WIDTH| LVCF_FMT |LVCF_SUBITEM; list.fmt = LVCFMT_LEFT; list.cx = 50; list.pszText = S.No; list.iSubItem = 0; /Inserts the column :SendMessage(hWnd,LVM_INSERTCOLUMN, (WPARAM)0,(WPARAM)&list); list.cx = 100; list.pszText = Name; list.iSubItem = 1; :SendMessage(hWnd ,LVM_INSERTCOLUMN, (WPARAM)1,(WPARAM)&list); list.cx = 100; list.pszText = Address; list.iSubItem = 2; :SendMessage(hWnd ,LVM_INSERTCOLUMN, (WPARAM)1,(WPARAM)&list); list.cx = 100; list.pszText = Country; list.iSubItem = 2; :SendMessage(hWnd ,LVM_INSERTCOLUMN, (WPARAM)1,(WPARAM)&list); / Inserts first Row with four columns . SetCell(hWnd,1,0,0); SetCell(hWnd,Prabhakar,0,1); SetCell(hWnd,Hyderabad,0,2); SetCell(hWnd,India,0,3); / Inserts second Row with four columns . SetCell(hWnd,2,1,0); SetCell(hWnd,Uday,1,1); SetCell(hWnd,Chennai,1,2); SetCell(hWnd,India,1,3); 自定义的SetCell( ) 函数，用来实现插入数据用的void CMultipleColumnsDlg:SetCell(HWND hWnd1, CString value, int nRow, int nCol) TCHAR szString 256; wsprintf(szString,value ,0); /Fill the LVITEM structure with the /values given as parameters. LVITEM lvItem; lvItem.mask = LVIF_TEXT; lvItem.iItem = nRow; lvItem.pszText = szString; lvItem.iSubItem = nCol; if(nCol 0) /set the value of listItem :SendMessage(hWnd1,LVM_SETITEM, (WPARAM)0,(WPARAM)&lvItem); else /Insert the value into List ListView_InsertItem(hWnd1,&lvItem);/通过行和列得到项目里面的数据CString CMultipleColumnsDlg:GetItemText( HWND hWnd, int nItem, int nSubItem) const LVITEM lvi; memset(&lvi, 0, sizeof(LVITEM); lvi.iSubItem = nSubItem; CString str; int nLen = 128; int nRes; do nLen *= 2; lvi.cchTextMax = nLen; lvi.pszText = str.GetBufferSetLength(nLen); nRes = (int):SendMessage(hWnd, LVM_GETITEMTEXT, (WPARAM)nItem, (LPARAM)&lvi); str.ReleaseBuffer(); return str;/为窗口类添加两个成员变量：int nItem, nSubItem;用Class wizard 添加 NM_CLICK 响应 ，当用户点击任何位置时，就会对应出现一个Edit Box，并可以修改数据void CMultipleColumnsDlg:OnClickList( NMHDR* pNMHDR, LRESULT* pResult) Invalidate(); HWND hWnd1 = :GetDlgItem (m_hWnd,IDC_LIST1); LPNMITEMACTIVATE temp = (LPNMITEMACTIVATE) pNMHDR; RECT rect; /get the row number nItem = temp-iItem; /get the column number nSubItem = temp-iSubItem; if(nSubItem = 0 | nSubItem = -1 | nItem = -1) return ; /Retrieve the text of the selected subItem /from the list CString str = GetItemText(hWnd1,nItem , nSubItem); RECT rect1,rect2; / this macro is used to retrieve the Rectanle / of the selected SubItem ListView_GetSubItemRect(hWnd1,temp-iItem, temp-iSubItem,LVIR_BOUNDS,&rect); /Get the Rectange of the listControl :GetWindowRect(temp-hdr.hwndFrom,&rect1); /Get the Rectange of the Dialog :GetWindowRect(m_hWnd,&rect2); int x=rect1.left-rect2.left; int y=rect1.top-rect2.top; if(nItem != -1) :SetWindowPos(:GetDlgItem(m_hWnd,IDC_EDIT1), HWND_TOP,rect.left+x,rect.top+4, rect.right-rect.left - 3, rect.bottom-rect.top -1,NULL); :ShowWindow(:GetDlgItem(m_hWnd,IDC_EDIT1),SW_SHOW); :SetFocus(:GetDlgItem(m_hWnd,IDC_EDIT1); /Draw a Rectangle around the SubItem :Rectangle(:GetDC(temp-hdr.hwndFrom), rect.left,rect.top-1,rect.right,rect.bottom); /Set the listItem text in the EditBox :SetWindowText(:GetDlgItem(m_hWnd,IDC_EDIT1),str); *pResult = 0;To handle the ENTER key we need to write the virtual function OnOk （响应ENTER键）afx_msg void OnOK();In MultipleColumnsDlg.cpp write the following code. / This function handles the ENTER key void CMultipleColumnsDlg:OnOK() CWnd* pwndCtrl = GetFocus(); / get the control ID which is / presently having the focus int ctrl_ID = pwndCtrl-GetDlgCtrlID(); CString str; switch (ctrl_ID) /if the control is the EditBox case IDC_EDIT1: /get the text from the EditBox GetDlgItemText(IDC_EDIT1,str); /set the value in the listContorl with the /specified Item & SubItem values SetCell(:GetDlgItem (m_hWnd,IDC_LIST1), str,nItem,nSubItem); :SendDlgItemMessage(m_hWnd,IDC_EDIT1, WM_KILLFOCUS,0,0); :ShowWindow(:GetDlgItem(m_hWnd,IDC_EDIT1), SW_HIDE); break; default: break; 最后一步在OnInitDialog 中设置List Control的样式 ListView_SetExtendedListViewStyle(:GetDlgItem (m_hWnd,IDC_LIST1),LVS_EX_FULLROWSELECT | LVS_EX_GRIDLINES); InsertItems();:ShowWindow(:GetDlgItem(m_hWnd,IDC_EDIT1),SW_HIDE);IntroductionAlmost every one of us who are programming in VC+ , will come across the List control. There are many cases where there is a need to represent data in List Control in multiple columns. By default it is not possible to modify the data in the List control itself. In this small article I am putting a simple way to edit any value in any column in a Report style List control. The logic here is simple, whenever user clicks on an sub-item which he wants to modify at that place I am displaying a edit box and allowing to modify the value. Once modified and by clicking the ENTER key, the updated value is set in the List control. Here I am assuming the user is familiar with VC+ and using Class Wizard Implementation steps:1. Using MFC AppWizard, create a Dialog Based application. Give the application name as MultipleColumns. By default the wizard adds OK and Cancel buttons to the Dialog, Remove these two buttons. 2. Now Add a List-Control and in properties change the style to Report, this style is necessary if we want multiple columns 3. Add two buttons to the Dialog and name them as OK and Exit 4. Add one Edit box and in the properties remove the Border style 5. Using the Class Wizard add the message handlers for the OK and Exit Buttons. Add the following code to those functions Collapse Copy Codevoid CMultipleColumnsDlg:OK() CDialog:EndDialog (0); / Add this lineCollapse Copy Codevoid CMultipleColumnsDlg:OnExit() CDialog:EndDialog (0); / Add this line6. Add a function called InsertItems() to the CMulipleColumnsDlg class. Collapse Copy Codevoid InsertItems();In the function handler add the following code Collapse Copy Code/ This function inserts the default values / into the listControlvoid CMultipleColumnsDlg:InsertItems() HWND hWnd = :GetDlgItem(m_hWnd, IDC_LIST1); / Set the LVCOLUMN structure with the required / column information LVCOLUMN list; list.mask = LVCF_TEXT |LVCF_WIDTH| LVCF_FMT |LVCF_SUBITEM; list.fmt = LVCFMT_LEFT; list.cx = 50; list.pszText = S.No; list.iSubItem = 0; /Inserts the column :SendMessage(hWnd,LVM_INSERTCOLUMN, (WPARAM)0,(WPARAM)&list); list.cx = 100; list.pszText = Name; list.iSubItem = 1; :SendMessage(hWnd ,LVM_INSERTCOLUMN, (WPARAM)1,(WPARAM)&list); list.cx = 100; list.pszText = Address; list.iSubItem = 2; :SendMessage(hWnd ,LVM_INSERTCOLUMN, (WPARAM)1,(WPARAM)&list); list.cx = 100; list.pszText = Country; list.iSubItem = 2; :SendMessage(hWnd ,LVM_INSERTCOLUMN, (WPARAM)1,(WPARAM)&list); / Inserts first Row with four columns . SetCell(hWnd,1,0,0); SetCell(hWnd,Prabhakar,0,1); SetCell(hWnd,Hyderabad,0,2); SetCell(hWnd,India,0,3); / Inserts second Row with four columns . SetCell(hWnd,2,1,0); SetCell(hWnd,Uday,1,1); SetCell(hWnd,Chennai,1,2); SetCell(hWnd,India,1,3); / Inserts third Row with four columns . SetCell(hWnd,3,2,0); SetCell(hWnd,Saradhi,2,1); SetCell(hWnd,Bangolore,2,2); SetCell(hWnd,India,2,3); / Inserts fourth Row with four columns . SetCell(hWnd,4,3,0); SetCell(hWnd,Surya,3,1); SetCell(hWnd,Calcutta,3,2); SetCell(hWnd,India,3,3);7. Add another function called SetCell( ) to the CMultipleColumnsDlg class Collapse Copy Codevoid SetCell(HWND hWnd1, CString value, int nRow, int nCol);In the function handler add the following code Collapse Copy Code/ This function set the text in the specified / SubItem depending on the Row and Column valuesvoid CMultipleColumnsDlg:SetCell(HWND hWnd1, CString value, int nRow, int nCol) TCHAR szString 256; wsprintf(szString,value ,0); /Fill the LVITEM structure with the /values given as parameters. LVITEM lvItem; lvItem.mask = LVIF_TEXT; lvItem.iItem = nRow; lvItem.pszText = szString; lvItem.iSubItem = nCol; if(nCol 0) /set the value of listItem :SendMessage(hWnd1,LVM_SETITEM, (WPARAM)0,(WPARAM)&lvItem); else /Insert the value into List ListView_InsertItem(hWnd1,&lvItem);8. Add one more function called GetItemText() to the same Class Collapse Copy CodeCString GetItemText(HWND hWnd, int nItem, int nSubItem) const;Inside the function add the following code Collapse Copy Code/this function will returns the item /text depending on the item and SubItem IndexCString CMultipleColumnsDlg:GetItemText( HWND hWnd, int nItem, int nSubItem) const LVITEM lvi; memset(&lvi, 0, sizeof(LVITEM); lvi.iSubItem = nSubItem; CString str; int nLen = 128; int nRes; do nLen *= 2; lvi.cchTextMax = nLen; lvi.pszText = str.GetBufferSetLength(nLen); nRes = (int):SendMessage(hWnd, LVM_GETITEMTEXT, (WPARAM)nItem, (LPARAM)&lvi); str.ReleaseBuffer(); return str;9. Also add two member variables to the CMultipleColumnsDlg class which are of type int Collapse Copy Codeint nItem, nSubItem;10. From the Class wizard add NM_CLICK notification to the List control. Inside the function handler write the following code Collapse Copy Code/This function Displays an EditBox at the position /where user clicks on a particular SubItem with /Rectangle are equal to the SubItem, thus allows to /modify the valuevoid CMultipleColumnsDlg:OnClickList( NMHDR* pNMHDR, LRESULT* pResult) Invalidate(); HWND hWnd1 = :GetDlgItem (m_hWnd,IDC_LIST1); LPNMITEMACTIVATE temp = (LPNMITEMACTIVATE) pNMHDR; RECT rect; /get the row number nItem = temp-iItem; /get the column number nSubItem = temp-iSubItem; if(nSubItem = 0 | nSubItem = -1 | nItem = -1) return ; /Retrieve the text of the selected subItem /from the list CString str = GetItemText(hWnd1,nItem , nSubItem); RECT rect1,rect2; / this macro is used to retrieve the Rectanle / of the selected SubItem ListView_GetSubItemRect(hWnd1,temp-iItem, temp-iSubItem,LVIR_BOUNDS,&rect); /Get the Rectange of the listControl :GetWindowRect(temp-hdr.hwndFrom,&rect1); /Get the Rectange of the Dialog :GetWindowRect(m_hWnd,&rect2); int x=rect1.left-rect2.left; int y=rect1.top-rect2.top; if(nItem != -1) :SetWindowPos(:GetDlgItem(m_hWnd,IDC_EDIT1), HWND_TOP,rect.left+x,rect.top+4, rect.right-rect.left - 3, rect.bottom-rect.top -1,NULL); :ShowWindow(:GetDlgItem(m_hWnd,IDC_EDIT1),SW_SHOW); :SetFocus(:GetDlgItem(m_hWnd,IDC_EDIT1); /Draw a Rectangle around the SubItem :Rectangle(:GetDC(temp-hdr.hwndFrom), rect.left,rect.top-1,rect.right,rect.bottom); /Set the listItem text in the EditBox :Set