[RESOLVED] How to know CTreeCtrl Checked State has changed

[sford]

I have a CTreeCtrl with checkboxes in a dialog that looks like this...


I need to get notified when the checked state of an item in the tree control has changed.

ON_NOTIFY(NM_CLICK... Does not seem to provide any information about WHICH item was clicked...

ON_NOTIFY(TVN_SELCHANGED... Is only triggered when the item is selected which does not happen if the user clicks on the checkbox, only when the user clicks on the item text.

I have an app that catches WM_LBUTTONDOWN and is then able to determine if the click was on a checkbox using CTreeCtrl::HitTest but this app is using a CTreeView. I cannot figure out how to set up the handler for WM_LBUTTONDOWN on the CTreeCtrl (or even if it is possible at all).

Bottom line... I need to know when a CTreeCtrl item checked state has changed, and which item changed.

Please help!!!

[sford]

Thanks to a post by clem in Oct 2000 I was able to get this figured out...

// Handler for ON_NOTIFY(NM_CLICK...
void CShowToolbars::OnClickToolbarTree(NMHDR* pNMHDR, LRESULT* pResult) 
{
///////////////////////////////////////////////////////////////////////////////////////////
// DON'T bother using this...
	NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
///////////////////////////////////////////////////////////////////////////////////////////

// get the mouse position relative to the treectrl
	CPoint ptMouse;
	UINT uFlags;
	GetCursorPos (&ptMouse);
	m_ctrlToolbarTree.ScreenToClient(&ptMouse); //Mouse coords

// determine if this location is on a treectrl item
	HTREEITEM hItem = m_ctrlToolbarTree.HitTest(ptMouse, &uFlags);

// action depends on whether the click was on the checkbox or the label
	if ((hItem != NULL) && (TVHT_ONITEMSTATEICON & uFlags))
	{
	//click was on state icon
	}
	else if ((hItem != NULL) && (TVHT_ONITEMLABEL & uFlags))
	{
	//click was on label
	}

	*pResult = 0;
}