is there a way to tell what "class" a dialog item is?

I have a subclass of CEdit called CEditColor. I also have a OnCtlColor function in my dialog. I need to skip the OnCtlColor function when the control is CEditColor. Is there a way to tell what the dialog item class is so I can code the skip?


Here is my OnCtlColor....

Code:

---


        if(m_bCustomColors)
        {
                HBRUSH hbr = NULL;
                switch(nCtlColor)
                {
                case CTLCOLOR_MSGBOX:
                        break;
                case CTLCOLOR_EDIT:
                        pDC->SetBkColor(m_colorListBoxBk);
                        pDC->SetTextColor(m_colorListBoxText);
                        hbr = m_brushListBox;
                        break;
                case CTLCOLOR_SCROLLBAR:
                        break;
                case CTLCOLOR_MAX:
                        break;
                case CTLCOLOR_STATIC:
                        pDC->SetBkMode(TRANSPARENT);
                        pDC->SetTextColor(m_colorStaticText);
                        hbr = m_bkBrush;
                        break;
                case CTLCOLOR_DLG:
                        hbr = m_bkBrush;
                        break;
                case CTLCOLOR_LISTBOX:
                        pDC->SetBkColor(m_colorListBoxBk);
                        pDC->SetTextColor(m_colorListBoxText);
                        hbr = m_brushListBox;
                        break;
                case CTLCOLOR_BTN:
                        pDC->SetBkColor(m_colorButtonBk);
                        hbr = m_brushButton;
                        break;
                default:
                        break;
                }
        //        hbr = NULL;
                if(hbr == NULL)
                        hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);

                return hbr;
        }
        else
        {
                return CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
        }

---

You can use Run-Time-Type-Information. MFC implements RTTI via MACROS and the CRuntimeClass structure.

Inside your CEditColor class definition (.h file), add this if it isn't already there:

DECLARE_DYNAMIC(CEditColor)

You won't need to do this if DECLARE_DYNCREATE() is there because DECLARE_DYNCREATE() implements DECLARE_DYNAMIC().

Next, add this to your CEditColor .cpp file (again, if it or IMPLEMENT_DYNCREATE() isn't already there):

IMPLEMENT_DYNAMIC(CEditColor, CEdit)

Now you can tell from the RTTI contained in the CWnd object passed to OnCtlColor() if it's a CEditColor control:

BOOL bIsEditColor = pWnd->IsKindOf(RUNTIME_CLASS(CEditColor));

THANK YOU!!!! This worked well. This has been bugging me for a couple weeks.

Quote:

---

Originally Posted by pbrama

THANK YOU!!!! This worked well. This has been bugging me for a couple weeks.

---

However, a program filled with RTTI like this indicates the program design is flawed.

In an OO program, it is not a good design to know exactly what classes you're dealing with at runtime like this. A C++ program should attempt to minimize the number of times it needs to do things like this:

Code:

---

if it's object A, do this
else if it's object B do that,
else if it's object C do something else,
else if it's object D do this thing here
etc...

---

Once you have multiple blocks of code looking like that, the design of your program needs to be looked at again. In C++, you have virtual functions to take care of issues such as this.

Regards,

Paul McKenzie

Quote:

---

Originally Posted by pbrama

I have a subclass of CEdit called CEditColor. I also have a OnCtlColor function in my dialog. I need to skip the OnCtlColor function when the control is CEditColor. Is there a way to tell what the dialog item class is so I can code the skip?

---

This should be handled by the framework using message reflection. Have a look at http://msdn.microsoft.com/en-us/libr...(v=vs.80).aspx.

Edit: I see this is answered in your other thread too. Please don't start multiple threads for the same problem.

Or just derive your control from CEdit and override the message handler.