CODEWITHSUNDEEP
c++mfckeypress
Kyle Williamson
Kyle Williamson

Reputation: 2184

Detecting Enter/Return on Keydown event in C++

I am trying to detect in my application, if the Enter/Return buttons are pressed. My problem is that the LVN_KEYDOWN event (Indicates that a key has been pressed) does not detect the Enter/Return key.

I have seen similar questions for other languages, but can not find a solution for C++.

My event to read the key press is:

void ListOption::OnLvnKeydownList1(NMHDR *pNMHDR, LRESULT *pResult)
{
    LPNMLVKEYDOWN pLVKeyDow = reinterpret_cast<LPNMLVKEYDOWN>(pNMHDR);
    // TODO: Add your control notification handler code here
    if(pLVKeyDow->wVKey == VK_RETURN)
    {
        OnItemActivateList1(pNMHDR, pResult);
        *pResult = 1;
    }
    *pResult = 0;
}

This code works for almost any key, execept for the Enter key.

My dialog has only one button, and it's "Default Button" value is FALSE. How is it possible to detect the keypress?

Update: My application uses modal dialogs.. It contains a CImageSheet that contains CImagePages(tabs). Here is an image to explain better (I have placed grey blocks to hide some private data).
enter image description here

When I press Enter, I wish to open a new dialog to change the option. Currently this is done with the LVN_ITEMCTIVATE event (when the user double clicks an item):

Upvotes: 4

Views: 5935

Answers (1)

Barmak Shemirani
Barmak Shemirani

Reputation: 31629

You can override PreTranslateMessage in the window which owns the ListView. In this case it seems to be a CPropertyPage. 

BOOL CMyPropertyPage::PreTranslateMessage(MSG* pMsg)
{
    //optional: you can handle keys only when ListView has focus
    if (GetFocus() == &List) 
    if (pMsg->message == WM_KEYDOWN)
    {
      if (pMsg->wParam == VK_RETURN)
      {
         //return 1 to eat the message, or allow for default processing
         int sel = List.GetNextItem(-1, LVNI_SELECTED);
         if (sel >= 0)
         {
            MessageBox("VK_RETURN");
            TRACE("ListView_GetNextItem %d\n", sel);
            return 1;
         }
         else
            TRACE("ListView_GetNextItem not-selected, %d\n", sel);
      }

      if (pMsg->wParam == VK_ESCAPE)
      {
         //do nothing!
      }
    }

    return CPropertyPage::PreTranslateMessage(pMsg);
}

Upvotes: 3

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