I'm working on a win32/MFC project. I have a custom CListCtrl control that I must to add, from time to time, some strings of characters. I absolutely need to perform some manipulations on items dynamically added to my CListCtrl.
Ultra-Basically, I need to:
I thought about doing this overriding the method DrawItem(). but OnDraw event seems not to be available for my CListCtrl.
Event is never generated.
IMPORTANT: Please note that MyCustomCListCtrl have "On Draw Fixed" property set to True, but "View" property is NOT set as a report.
So, I have decided to handle NW_CUSTOMDRAW event, writing my CustomDraw Handler, as explained here and here:
Here you can view another code example.
Then, I need a way to retrieve single itemIDs from my CListCtrl.
More precisely, I need a way to get single item IDs from NMHDR struct.
How can I do this? I am only able to obtain the ID of the LAST item that I have added. I am sure it's a simple mistake I can't find.
A sample piece of code below:
Source of Dialog that contains CList Ctrl:
/* file MyDlg.cpp */
#include "stdafx.h"
#include "MyDlg.h"
// MyDlg dialog
IMPLEMENT_DYNAMIC(MyDlg, CDialog)
MyDlg::MyDlg(CWnd* pParent)
: CDialog(MyDlg::IDD, pParent)
{
}
MyDlg::~MyDlg()
{
}
void MyDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
DDX_Control(pDX, IDC_LIST1, listView); /* listView is a MyCustomCListCtrl object */
}
BEGIN_MESSAGE_MAP(MyDlg, CDialog)
ON_BN_CLICKED(IDC_BUTTON1, &MyDlg::OnBnClickedButton1)
END_MESSAGE_MAP()
BOOL MyDlg::OnInitDialog()
{
CDialog::OnInitDialog();
return TRUE;
}
/* OnBnClickedButton1 handler add new strings to MyCustomCListCtrl object */
void MyDlg::OnBnClickedButton1()
{
listView.InsertItem(0, "Hello,");
listView.InsertItem(1, "World!");
}
My Custom CList Ctrl source:
/* file MyCustomCListCtrl.cpp */
#include "stdafx.h"
#include "MyCustomCListCtrl.h"
MyCustomCListCtrl::MyCustomCListCtrl()
{
}
MyCustomCListCtrl::~MyCustomCListCtrl()
{
}
BEGIN_MESSAGE_MAP(MyCustomCListCtrl, CListCtrl)
//{{AFX_MSG_MAP(MyCustomCListCtrl)
//}}AFX_MSG_MAP
// ON_WM_DRAWITEM() /* WM_DRAWITEM NON-AVAILABLE */
ON_NOTIFY_REFLECT(NM_CUSTOMDRAW, OnCustomDraw)
END_MESSAGE_MAP()
// 'Owner Draw Fixed' property is already TRUE
/* void CTranslatedCListCtrl::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
bool inside = true; /* Member function removed: I never enter here... */
} */
void MyCustomCListCtrl::OnCustomDraw(NMHDR* pNMHDR, LRESULT* pResult)
{
/* Here, I must retrieve single strings added to my MyCustomCListCtrl object */
LPNMLISTVIEW plvInfo = (LPNMLISTVIEW)pNMHDR;
LVITEM lvItem;
lvItem.iItem = plvInfo->iItem; /* Here I always get _the same_ ID: ID of last element...*/
lvItem.iSubItem = plvInfo->iSubItem; // subItem not used, for now...
int MyID = 0;
this->GetItem(&lvItem); // There mai be something error here?
MyID = lvItem.iItem;
CString str = this->GetItemText(MyID, 0); /* ...due to previous error, here I will always get the last string I have added("World!") */
// Immediately after obtaining ALL IDS, I can Do My Work
*pResult = 0;
}
Any help is appreciated!
P.S. Please do not give me tips like:
I have already tried everything... :-)
Thanks to all!
IT
first of all... Thank you wasted your precious time with this stupid question.
I never found anything about LVN_INSERT
event.
I write scientific software(most on Linux platform); I am not a long-time Win32 developer, so I don't know Win32 APIs in depth.
I have modified source file of MyCustomCListCtrl
class, as you have suggested.
Code below seems to be the best( and faster )way to achieve what I want:
/* file MyCustomCListCtrl.cpp */
#include "stdafx.h"
#include "MyCustomCListCtrl.h"
MyCustomCListCtrl::MyCustomCListCtrl()
{
}
MyCustomCListCtrl::~MyCustomCListCtrl()
{
}
BEGIN_MESSAGE_MAP(MyCustomCListCtrl, CListCtrl)
//{{AFX_MSG_MAP(MyCustomCListCtrl)
//}}AFX_MSG_MAP
ON_NOTIFY_REFLECT(LVN_INSERTITEM, OnLvnInsertItem)
END_MESSAGE_MAP()
...
afx_msg void CTranslatedListCtrl::OnLvnInsertItem(NMHDR* pNMHDR, LRESULT* pResult)
{
LPNMLISTVIEW plvInfo = (LPNMLISTVIEW)pNMHDR;
CString str = this->GetItemText(plvInfo->iItem, 0);
// Add Some Logic
*pResult = 0;
}
Can You confirm? From what I can see, it seems to work. :-) Thanks again!
IT