Advanced MFC Programming

Chapter 6. Dialog Box
The function has six parameters, among them, nFlag, lprectParam and lpRectClient all have default
values. When we called this function in the previous step, all the default values were used. This will pass
CWnd::reposDefault to parameter nFlag, which will cause the default layout to be performed. If we pass
CWnd::reposQuery to parameter nFlag, we can prepare a CRect type object and pass its address to
lpRectParam to receive the new client area dimension (The client area is calculated with the consideration
of control bars, their sizes are deducted from the original dimension of the client area). This operation will
not let the layout be actually carried out. Based on the retrieved size, we can adjust the size of the dialog
box and move the controls so that we can leave enough room to accommodate the tool bar and the status
bar.
The following is the updated implementation of function CDBDlg::OnInitDialog():
……
BOOL CDBDlg::OnInitDialog()
{
CRect rectOld;
CRect rectNew;
CRect rect;
CPoint ptOffset;
CWnd *pWndCtrl;
GetClientRect(rectOld);
if
(
)
{
}
if
(
)
{
!m_wndToolBar.Create(this) ||
!m_wndToolBar.LoadToolBar(IDD)
TRACE0("Failed to create toolbar\n");
return -1;
!m_wndStatusBar.Create(this) ||
!m_wndStatusBar.SetIndicators
(
indicators,
sizeof(indicators)/sizeof(UINT)
)
TRACE0("Failed to create status bar\n");
return -1;
}
m_wndStatusBar.SetPaneInfo
(
0,
m_wndStatusBar.GetItemID(0),
SBPS_STRETCH,
NULL
);
m_wndToolBar.SetBarStyle
(
m_wndToolBar.GetBarStyle() |
CBRS_TOOLTIPS | CBRS_FLYBY
);
RepositionBars
(
AFX_IDW_CONTROLBAR_FIRST,
AFX_IDW_CONTROLBAR_LAST,
0,
CWnd::reposQuery,
rectNew
);
ptOffset.x=rectNew.left-rectOld.left;
ptOffset.y=rectNew.top-rectOld.top;
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