Question

I am using a MFC link control in my dialog based application,and I add an event handler of BN_CLICKED for it, hoping that it could do something for me, however, when i click on it, it just does nothing at all(when i don’t set the url of it, when i set the url, it will jump to that url), my event handler is not triggered. So, how to disable its default “jump” behaviour and trigger my handler?

Answer 1

Subclassing CMFCLinkCtrl and adding an ON_WM_LBUTTONDOWN event handler seems to work.

You can then choose whether or not to call CMFCLinkCtrl::OnLButtonDown.

class CMyLinkCtrl : public CMFCLinkCtrl {
    DECLARE_DYNAMIC(CMyLinkCtrl)
public:
    CMyLinkCtrl();
    virtual ~CMyLinkCtrl();
    afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
protected:
    DECLARE_MESSAGE_MAP()
};

IMPLEMENT_DYNAMIC(CMyLinkCtrl, CMFCLinkCtrl)

CMyLinkCtrl::CMyLinkCtrl() {
}

CMyLinkCtrl::~CMyLinkCtrl() {
}

BEGIN_MESSAGE_MAP(CMyLinkCtrl, CMFCLinkCtrl)
    ON_WM_LBUTTONDOWN()
END_MESSAGE_MAP()

void CMyLinkCtrl::OnLButtonDown(UINT nFlags, CPoint point) {
    static bool bDisabled = false;
    if(bDisabled) {
        MessageBox(_T("Link is disabled"));
    } else {
        CMFCLinkCtrl::OnLButtonDown(nFlags, point);
    }
    bDisabled = !bDisabled;
}