Advanced MFC Programming

Chapter 1. Tool Bar and Dialog Bar
void CBarDoc::OnButtons(UINT uID)
{
m_uCurrentBtn=uID;
}
void CBarDoc::OnUpdateButtons(CCmdUI* pCmdUI)
{
pCmdUI->SetRadio(pCmdUI->m_nID == m_uCurrentBtn);
}
Please compare the above code with the implementation in section 1.2. When we ask Class Wizard to
add message mapping macros, it always adds them between //{{AFX_MSG comments. Actually, these
comments are used by the Class Wizard to locate macros. To distinguish between the work done by
ourselves and that done by Class Wizard, we can add the statements outside the two comments.
1.5. Fixing the Size of Tool Bar
Remember in section 1.1, when creating the color bar, we used CBRS_SIZE_DYNAMIC style:
m_wndToolBar.SetBarStyle
(
m_wndToolBar.GetBarStyle() | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC
);
This allows the size of a tool bar to change dynamically. When the bar is floating or docked to top or
bottom border of the client area, the buttons will have a horizontal layout. If the bar is docked to left or
right border, they will have a vertical layout.
Sometimes we may want to fix the size of the tool bar, and disable the dynamic layout feature. This
can be achieved through specifying CBRS_SIZE_FIXED flag instead of CBRS_SIZE_DYNAMIC flag when calling
function CToolBar::SetBarStyle(…).
By default, the buttons on the tool bar will have a horizontal layout. If we fix the size of the tool bar,
its initial layout will not change throughout application’s lifetime. This will cause the tool bar to take up too
much area when it is docked to either left or right border of the client area (Figure 1-6).
Instead of fixing the layout this way, we may want to wrap the tool bar from the second button, so the
width and height of the tool bar will be roughly the same at any time (Figure 1-7).
Figure 1-6: Docking a tool bar with horizontal layout to the
left or right border will take up too much window area
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