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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
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 line
}
void 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 插入行
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);