Simple Row Insert for CListCtrl






4.47/5 (24 votes)
Jul 10, 2000

307808
This simple CListCtrl extension allows easy row insertion when in Report mode.
Ever been annoyed at the amount of code you need just to insert a few rows and their
columns' text into a CListCtrl
while using the 'Report' style?
This little MFC subclassing tutorial provides a handy little enhancement to the
standard CListCtrl
, which can make life easier for both beginners and
not_so_beginners alike.
The code and text that follows assumes you have generated a typcal Dialog based application with the MFC Application (.exe) Appwizard in MS Visual C++.
Derive a new CListCtrl
based class (here CMyListCtrl
).
In the VC IDE, this is as simple as selcting 'Add Class...' from the MFC Class wizard
then, in the new class dialog, naming the control and selecting CListCtrl
as
the base class in the drop down list.
To use the new class, start by adding a CListCtrl
to the dialog (be sure
to select 'Report' in the Styles page of the proprties for the new control) then, in the
Member Variables page of the MFC Class Wizard (ctrl+w), add a control variable for the
newly created item (IDC_LIST1
, or whatever ID you supplied) - but instead of
accepting the default CListCtrl
as the type, you will be able to select the
new CMyListCtrl
type. Call the variable m_myList
.
Specify
#include "MyListCtrl.h"
in the header of the dialog class (in this case, the main dialog of the app) and you're set.
In the code that VC generates for the new class, add the following:
// put this into the header file, in the public: section int InsertRow(int nPos,int nNoOfCols, LPCTSTR pText, ...); //
// and this into the cpp file, in the public: section int CMyListCtrl::InsertRow(int nPos,int nNoOfCols, LPCTSTR pText, ...) { va_list argList; va_start(argList, pText); ASSERT(nNoOfCols >= 1); // use the 'normal' Insert function with 1 argument int nIndex = InsertItem(LVIF_TEXT|LVIF_STATE, nPos, pText,0,LVIS_SELECTED,0,0); ASSERT(nIndex != -1); if (nIndex < 0) return(nIndex); for (int i = 1; i < nNoOfCols; i++) { LPCSTR p = va_arg(argList,LPCSTR); if (p != NULL) { SetItemText(nIndex, i, p); } } va_end(argList); return(nIndex); }
// In your program the list control can now be filled like this: myList.InsertRow(0,3,_T("Sample 1"),_T("Column 2 for row 1"),_T("Column 3 for row 1")); myList.InsertRow(1,3,_T("Sample 2"),_T("Column 2 for row 2"),_T("Column 3 for row 2")); myList.InsertRow(2,3,_T("Sample 3"),_T("Column 2 for row 3"),_T("Column 3 for row 3")); myList.InsertRow(3,1,_T("Sample 4")); // nothing for column 2 and 3 myList.InsertRow(4,3,_T("Sample 5"),_T("Column 2 for row 5"),_T("Column 3 for row 5")); myList.InsertRow(5,2,_T("Sample 6"),_T("Column 2 for row 6")); // nothing for column 3
To test, you might add a command button that executes the above code. Also, this assumes that you have initialized the list with 3 columns - for the sake of this simple example, you might provide the following in the OnInitDialog method of the dialog class:
// TODO: Add extra initialization here m_myList.InsertColumn(0, "Column 1"); m_myList.InsertColumn(1, "Column 2"); m_myList.InsertColumn(2, "Column 3"); m_myList.SetColumnWidth(0, 100); m_myList.SetColumnWidth(1, 100); m_myList.SetColumnWidth(2, 100);
Enjoy!