mirror/emacs
1
0
Fork 0
mirror of https://git.savannah.gnu.org/git/emacs.git synced 2024-12-24 10:38:38 +00:00
Code Issues Releases Activity

(Fframe_or_buffer_changed_p): New function.

Browse Source
This commit is contained in:
Karl Heuer 1994-06-06 05:03:41 +00:00
parent 4c7d5f1318
commit 078b369638
1 changed files with 57 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
src/dispnew.c
View File

@ -1858,6 +1858,59 @@ update_line (frame, vpos)
current_frame->charstarts[vpos] = temp1;
}
/* A vector of size NFRAMES + 3 * NBUFFERS + 1, containing the session's
frames, buffers, buffer-read-only flags, and buffer-modified-flags,
and a trailing sentinel (so we don't need to add length checks). */
static Lisp_Object frame_and_buffer_state;
DEFUN ("frame-or-buffer-changed-p", Fframe_or_buffer_changed_p,
Sframe_or_buffer_changed_p, 0, 0, 0,
"Return non-nil if the frame and buffer state appears to have changed.\n\
The state variable is an internal vector containing all frames and buffers,\n\
along with the buffers' read-only and modified flags, which allows a fast\n\
check to see whether the menu bars might need to be recomputed.\n\
If this function returns non-nil, it updates the internal vector to reflect\n\
the current state.\n")
()
{
Lisp_Object tail, frame, buf;
Lisp_Object *vecp;
int n;
vecp = XVECTOR (frame_and_buffer_state)->contents;
FOR_EACH_FRAME (tail, frame)
if (!EQ (*vecp++, frame))
goto changed;
for (tail = Vbuffer_alist; CONSP (tail); tail = XCONS (tail)->cdr)
{
buf = XCONS (XCONS (tail)->car)->cdr;
if (!EQ (*vecp++, buf))
goto changed;
if (!EQ (*vecp++, XBUFFER (buf)->read_only))
goto changed;
if (!EQ (*vecp++, Fbuffer_modified_p (buf)))
goto changed;
}
return Qnil;
changed:
n = 1;
FOR_EACH_FRAME (tail, frame)
n++;
for (tail = Vbuffer_alist; CONSP (tail); tail = XCONS (tail)->cdr)
n += 3;
frame_and_buffer_state = Fmake_vector (make_number (n), Qlambda);
vecp = XVECTOR (frame_and_buffer_state)->contents;
FOR_EACH_FRAME (tail, frame)
*vecp++ = frame;
for (tail = Vbuffer_alist; CONSP (tail); tail = XCONS (tail)->cdr)
{
buf = XCONS (XCONS (tail)->car)->cdr;
*vecp++ = buf;
*vecp++ = XBUFFER (buf)->read_only;
*vecp++ = Fbuffer_modified_p (buf);
}
return Qt;
}
DEFUN ("open-termscript", Fopen_termscript, Sopen_termscript,
1, 1, "FOpen termscript file: ",
"Start writing all terminal output to FILE as well as the terminal.\n\
@ -2395,12 +2448,16 @@ syms_of_display ()
defsubr (&Sredraw_frame);
#endif
defsubr (&Sredraw_display);
defsubr (&Sframe_or_buffer_changed_p);
defsubr (&Sopen_termscript);
defsubr (&Sding);
defsubr (&Ssit_for);
defsubr (&Ssleep_for);
defsubr (&Ssend_string_to_terminal);
frame_and_buffer_state = Fmake_vector (make_number (1), Qlambda);
staticpro (&frame_and_buffer_state);
DEFVAR_INT ("baud-rate", &baud_rate,
"The output baud rate of the terminal.\n\
On most systems, changing this value will affect the amount of padding\n\