CODEWITHSUNDEEP
listviewmfcevent-handlingwtlclistctrl
Zoli
Zoli

Reputation: 910

Why WM_CHAR is not called in my ListView

There is a WTL::CListViewCtrl, which is displayed in a Window. When it has the focus, and any key is pressed, the WM_KEYDOWN / UP is called, but the WM_CHAR.

class CPopupList : public CWindowImpl<CPopupList, WTL::CListViewCtrl>
{
public:
    DECLARE_WND_SUPERCLASS(NULL, WTL::CListViewCtrl::GetWndClassName())

BEGIN_MSG_MAP(CPopupList)
    MESSAGE_HANDLER(WM_GETDLGCODE, OnGetDlgCode)
    MESSAGE_HANDLER(WM_KEYDOWN, OnKeyDown)
    MESSAGE_HANDLER(WM_KEYUP, OnKeyUp)
    MESSAGE_HANDLER(WM_CHAR, OnChar)
    REFLECTED_NOTIFY_CODE_HANDLER(LVN_ITEMCHANGED, OnListItemChanged)
    DEFAULT_REFLECTION_HANDLER()
END_MSG_MAP()

LRESULT OnKeyDown(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM lParam, BOOL& /*bHandled*/);
LRESULT OnKeyUp(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM lParam, BOOL&  /*bHandled*/);
LRESULT OnChar(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM lParam, BOOL& /*bHandled*/);
LRESULT OnGetDlgCode(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM lParam, BOOL&     afx_msg LRESULT OnListItemChanged(WPARAM wParam, LPNMHDR hdr, BOOL&);
...
}

Both CPopupList::OnKeyDown and CPopupList::OnKeyUp are called, but CPopupList::OnChar is not.

The OnGetDlgCode code is return DLGC_WANTALLKEYS | DLGC_WANTCHARS;

What I found, if I post the WM_KEYDOWN to the Parent window, WM_CHAR is being called in the Parent:

LRESULT CPopupList::OnKeyDown(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
    ::PostMessage(m_hWndParentCtrl, uMsg, wParam, lParam); -> this will call WM_KEYDOWN + WM_CHAR in parent
}

I would like to catch the WM_CHAR here in the ListView. How can I do that, what am I missing?

Upvotes: 0

Views: 383

Answers (1)

l33t
l33t

Reputation: 19966

ListView does not allow typing text. Hence, it does not need to produce WM_CHAR. This particular message is typically translated from keystrokes using the TranslateMessage API. Your parent window obviously makes a call to it.

Upvotes: 2

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