📄 dlgctrls_help_in_status.shtml
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<TITLE>Display help for dialog controls on the status bar</TITLE>
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Display help for dialog controls on the status bar
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This article was contributed by <A HREF="mailto:nikolay@jriver.com">Nikolay Sokratov</A>.
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<p>If the user passes the mouse over a button, extra help text for that button should appear in
the status bar. To use status bar to display extra help for dialog controls is preaty easy.
Every time the mouse passes over a window, the WM_SETCURSOR message is sent to the window's owner.
If we catch the message through OnSetCursor, we can easy determine if the mouse is over a dialog
control. Then, assuming the control has a string resource with the same ID, we pass the ID to a
special function that sets the text in the first status bar pane.<br>
<br>
1. Create function to handle WM_SETCURSOR
<FONT COLOR="#990000"><TT><PRE>
BOOL CAboutDlg::OnSetCursor(CWnd * pWnd, UINT nHitText, UINT message)
{
// if the cursor is not over a child window control, revert
// to the default status bar text
if(pWnd == this)
SetPaneText();
else
SetPaneText(pWnd->GetDlgCtrlID());
return CDialog::OnSetCursor(pWnd, nHitTest, message);
}
</tt></PRE></FONT>
2. Handle WM_DESTROY message to restore status bar text
<FONT COLOR="#990000"><TT><PRE>
void CAboutDlg::OnDestroy()
{
SetPaneText();
CDialog::OnDestroy();
}
</tt></PRE></FONT>
3. Add SetPaneText helper function
<FONT COLOR="#990000"><TT><PRE>
// this part goes to CAboutDlg class declaration
protected:
void SetPaneText(UINT nID = 0);
// and this is function implementation
void CAboutDlg::SetPaneText(UINT nID)
{
if(nID == 0)
nID = AFX_IDS_IDLEMESSAGE;
CWnd * pWnd = AfxGetMainWnd()->GetDescendantWindow(AFX_IDW_STATUS_BAR);
if(pWnd)
{
AfxGetMainWnd()->SendMessage(WM_SETMESSAGESTRING, nID);
pWnd->SendMessage(WM_IDLEUPDATECMDUI);
pWnd->UpdateWindow();
}
}
</tt></PRE></FONT>
4. And finally do not foget to add following include files
<FONT COLOR="#990000"><TT><PRE>
#include <afxpriv.h> // for WM_SETMESSAGESTRING and WM_IDLEUPDATECMDUI
#include <afxres.h> // for AFX_IDW_STATUS_BAR
</tt></PRE></FONT>
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<p>Last updated: 11 May 1998
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