Question

I want to make a button on an MFC tool bar that can be pressed and retain it’s state until pressed again (like a check box) but I don’t want a tick box. I’d ideally like a button that changes between two icons and uses DDV to change the value of a boolean on being pressed. How would I go about this.

As a side question I could really do with a good book on MFC. I’ve got Programming Windows with MFC 2nd edition, but was wondering if there was anything that went into a bit more detail?

Answer 1

Use ON_UPDATE_COMMAND_UI to set the state of the button. e.g. a typical handler will look like this:

BEGIN_MESSAGE_MAP(CMyView, CView)
    ON_UPDATE_COMMAND_UI(ID_MY_BUTTON, OnUpdateMyButton)
END_MESSAGE_MAP()

...

void CMyView::OnUpdateMyButton(CCmdUI* pCmdUI) 
{
    // TODO: Add your command update UI handler code here

    pCmdUI->SetCheck( isButtonPressed() );
}

With regard to good MFC documentation I recommend Professional MFC (Mike Blaszczak) – it’s a little old but very good.