/[emacs]/emacs/lispref/modes.texi
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revision 1.43 by rms, Tue Dec 11 06:10:32 2001 UTC revision 1.44 by rms, Mon Dec 24 16:28:22 2001 UTC
# Line 1058  line and column numbers, since those dep Line 1058  line and column numbers, since those dep
1058  window is scrolled.  @code{header-line-format} is used likewise for  window is scrolled.  @code{header-line-format} is used likewise for
1059  header lines.  header lines.
1060    
1061    The mode line and header line of a window are normally updated    For efficiency, Emacs does not recompute the mode line and header
1062  whenever a different buffer is shown in the window, or when the buffer's  line of a window in every redisplay.  It does so when circumstances
1063  modified-status changes from @code{nil} to @code{t} or vice-versa.  If  appear to call for it---for instance, if you change the window
1064  you modify any of the variables referenced by @code{mode-line-format}  configuration, switch buffers, narrow or widen the buffer, scroll, or
1065  (@pxref{Mode Line Variables}), or any other variables and data  change the buffer's modification status.  If you modify any of the
1066  structures that affect how text is displayed (@pxref{Display}), you may  variables referenced by @code{mode-line-format} (@pxref{Mode Line
1067  want to force an update of the mode line so as to display the new  Variables}), or any other variables and data structures that affect
1068  information or display it in the new way.  how text is displayed (@pxref{Display}), you may want to force an
1069    update of the mode line so as to display the new information or
1070    display it in the new way.
1071    
1072  @c Emacs 19 feature  @c Emacs 19 feature
1073  @defun force-mode-line-update  @defun force-mode-line-update
1074  Force redisplay of the current buffer's mode line and header line.  Force redisplay of the current buffer's mode line and header line.
1075    The next redisplay will update the mode line and header line based on
1076    the latest values of all relevant variables.
1077    
1078    This function also forces recomputation of the menu bar menus
1079    and the frame title.
1080  @end defun  @end defun
1081    
1082    The mode line is usually displayed in inverse video; see    The mode line is usually displayed in inverse video; see

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