[RESOLVED] Of CComboBox and CListCtrl on a CDialog

[Mustafa]

Hi all gurus,

Thought this was simple and straight forward but got stuck with the most trivial problem and in need of your help...

I have a ListCtrl on a dialog and all I am trying to do is paste a CComboBox object on the fly when user clicked on the List Control, I filled the CComboBox with values and when the user selects an item in the ComboBox it will update the column in the ListCtrl..

I inherit a new class from CComboBox and named it CComboBoxItem and overide the CComboBoxItem::OnSelchange().

On the click event of the ListCtrl, I had created the CComboBoxItem object on top of the column which the user clicked...all is fine, but when user selects an item in the CComboBoxItem, the OnSelchange was NOT triggered??..when I created it, I set the parent as the CListCtrl. But when I set the parent as the Dialog holding the CListCtrl, the OnSelchange event got triggered...

Any ideas why?? Here's a snippet of the codes

void CSettingDlg::OnClickList1(NMHDR* pNMHDR, LRESULT* pResult) 
{
	// TODO: Add your control notification handler code here
	NMLISTVIEW & nm = *(NMLISTVIEW *) pNMHDR; //This converts the pNMHDR to the specific column and row

	if (nm.iItem==-1||nm.iSubItem==0)
	{
		if(m_pCombo)
		{
			m_pCombo->DestroyWindow();
			delete m_pCombo;
			this->m_pCombo=NULL;
		}
		return;//No need to go on user clicked on empty area or on column 1...no editing
	}

	CListCtrl* pList=(CListCtrl*)this->GetDlgItem(IDC_LIST1);
	CRect rect;
	pList->GetSubItemRect(nm.iItem,nm.iSubItem,LVIR_LABEL,rect);
	if(m_pCombo)
	{
		m_pCombo->DestroyWindow();
		delete m_pCombo;
		this->m_pCombo=NULL;
	}

	this->m_pCombo=new CComboBoxItem;
	int nHeight=rect.Height();//Just to save the height
	rect.bottom+=70;
	this->m_pCombo->Create(WS_VISIBLE|WS_CHILD|CBS_DROPDOWNLIST|WS_VSCROLL,rect,pList,NULL);

        //But if I did this, the CComboBoxItem::OnSelchange event got triggered??
        //this->m_pCombo->Create(WS_VISIBLE|WS_CHILD|CBS_DROPDOWNLIST|WS_VSCROLL,rect,this,NULL);


	this->m_pCombo->SetDroppedWidth(70);
	this->m_pCombo->SetFont(pList->GetFont());

//and so forth.....
}

//Here's another snippet from CComboBoxItem

BEGIN_MESSAGE_MAP(CComboBoxItem, CComboBox)
	//{{AFX_MSG_MAP(CComboBoxItem)
	ON_CONTROL_REFLECT(CBN_SELCHANGE, OnSelchange)
	ON_CONTROL_REFLECT(CBN_CLOSEUP, OnCloseup)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

Help...pls

Regards

Mustafa

[Arjay]

Check out the LVEdit.zip source included in the post "Need help building a multicolumn list box".

The source allows the user to edit a list control item. When the user double clicks a list item, a combobox, edit control, or spin control item is presented to the user.

[Mustafa]

Thanks Arjay,

The solution looks great....but what I need is the clarification of why when the CComboBoxItem object when given the CListCtrl as its parent doesnt get the reflected notification of the Selchange event but if the CDialog is given as the parent instead, the Selchange event reflected notification was triggered.

I still need help here....

Thanks very much for the sample...

Regards

Mustafa

[VictorN]

Because every mouse event in initially handled by Dialog procedure, then it is redirected to the Dialog's child control, if any...
In your case the combobox is not a child of the dialog, so the double-click is redirected only to the list control. You, however, could yourself handle mouse double-click in your CListCtrl derived class, check the message position, and if it is within the combo-box position SendMessage a user defined message to the combobox causing it to do what you want.

[Mustafa]

I have finally resolved this issue...what I did was to create a member variable in CDialog object of the type CListCtrl using the Classwizard and let it create the entry in the DoDataExchange function of the CDialog.

And guess what!!! My ON_CONTROL_REFLECT(CBN_SELCHANGE, OnSelchange) in the derived CComboBox class got fired......

It looked like this:

void CSettingDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CSettingDlg)
	DDX_Control(pDX, IDC_LIST1, m_List1);
	DDX_Text(pDX, IDC_EDIT1, m_strCompanyName);

Hope it helps anyone out there...
Cheers...