本文全面介绍了如何编辑List Control里面的任何子项

http://www.codeproject.com/KB/list/editing_subitems_in_listcontrol/scrshot.jpg

 

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);