Advanced MFC Programming

Chapter 6. Dialog Box
pWndCtrl=GetWindow(GW_CHILD);
while(pWndCtrl)
{
pWndCtrl->GetWindowRect(rect);
ScreenToClient(rect);
rect.OffsetRect(ptOffset);
pWndCtrl->MoveWindow(rect, FALSE);
pWndCtrl=pWndCtrl->GetNextWindow();
}
GetWindowRect(rect);
rect.right+=rectOld.Width()-rectNew.Width();
rect.bottom+=rectOld.Height()-rectNew.Height();
MoveWindow(rect);
RepositionBars
(
AFX_IDW_CONTROLBAR_FIRST,
AFX_IDW_CONTROLBAR_LAST,
0
);
}
return TRUE;
First function CWnd::GetClientRect() is called and the dimension of client window is stored in
rectOld. After the control bars are created, we call function CWnd::RepositionBars(…) and use flag
CWnd::reposQuery to obtain the new layout dimension with the consideration of two control bars. The new
layout dimension is stored in variable rectNew. The offset is calculated by deducting rectOld from
rectNew. To access all the controls in the dialog box, we first call CWnd::GetWindow(…) using GW_CHILD
flag to obtain the first child window of the dialog box, then call CWnd::GetNextWindow() repeatedly to find
all the other child windows. Each child window is moved according to the offset dimension. Finally the
dialog box is resized by calling function CWnd::RepositionBars(…) using the default parameters.
Tool Tip and Flyby Implementation
We need to add message handler for TTN_NEEDTEXT notification in order to implement tool tips. Also,
we need to handle WM_SETMESSAGESTRING and WM_POPMESSAGESTRING in order to implement flybys on the
status bar.
In the sample, three new message handlers are added to class CDBDlg:
……
class CDBDlg : public CDialog
{
};
//}}AFX_MSG
afx_msg BOOL OnToolTipText(UINT, NMHDR *, LRESULT *);
afx_msg LRESULT OnSetMessageString(WPARAM, LPARAM=0L);
afx_msg LRESULT OnPopMessageString(WPARAM wParam, LPARAM lParam);
DECLARE_DYNAMIC(CDBDlg)
DECLARE_MESSAGE_MAP()
Function CDBDlg::OnTooltipText(…) will be used to handle TTN_NEEDTEXT message, CDBDlg::
OnSetMessageString(…) and CDBDlg::OnPopMessageString(…) will be used to handle
WM_SETMESSAGESTRING and WM_POPMESSAGESTRING respectively.
Message mapping macros are added to the implementation file as follows:
……
BEGIN_MESSAGE_MAP(CDBDlg, CDialog)
ON_WM_QUERYDRAGICON()
//}}AFX_MSG_MAP
ON_NOTIFY_EX(TTN_NEEDTEXT, 0, OnToolTipText)
ON_MESSAGE(WM_SETMESSAGESTRING, OnSetMessageString)
ON_MESSAGE(WM_POPMESSAGESTRING, OnPopMessageString)
END_MESSAGE_MAP()
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