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

[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?


Here is my OnCtlColor....

	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);
	}

[0xC0000005]

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));

[pbrama]

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

[Paul McKenzie]

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:

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

[D_Drmmr]

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.

[GCDEF]

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