C / C++ / MFC

class CTheView : public CWindowImpl<CTheView, CDragListBox>
{
public:
	DECLARE_WND_SUPERCLASS(NULL, CDragListBox::GetWndClassName())
	/* wizard code */
};
 
class CMainFrame : /* wizard code */, public CDragListNotifyImpl<CMainFrame>
{
	/* wizard code */
	CTheView m_view;
 
	LRESULT OnCreate(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
	{
		/* wizard code */
 
		// MakeDragList is suppose to be called in CDragListBox::Create but
		// it is not. I traced CDragListBox::Create, for some reason it is
		// never called.
		// I noticed when this call is commented out the list box changes its
		// selection then you drag the cursor around while holding the left
		// button down. It does not do this when MakeDragList is called.
		m_view.MakeDragList();
	}
 
	BOOL OnBeginDrag(int /*nCtlID*/, HWND /*hWndDragList*/, POINT /*ptCursor*/)
	{
		// This never outputs.
		ATLTRACE("CMainFrame::OnBeginDrag\n");
		return TRUE;	// allow dragging
	}
	// I tried ATLTRACE in OnCancelDrag, OnDragging, and OnDropped but they
	// are never outputed either. They were omited for brevity.
};