1 /* Display generation from window structure and buffer text.
2 Copyright (C) 1985, 1986, 1987, 1988, 1993 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
6 GNU Emacs is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU Emacs is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
23 /*#include <ctype.h>*/
29 #include "dispextern.h"
35 #include "termhooks.h"
36 #include "intervals.h"
38 extern int interrupt_input
;
39 extern int command_loop_level
;
41 /* Nonzero means print newline before next minibuffer message. */
43 int noninteractive_need_newline
;
45 #define min(a, b) ((a) < (b) ? (a) : (b))
46 #define max(a, b) ((a) > (b) ? (a) : (b))
48 /* The buffer position of the first character appearing
49 entirely or partially on the current frame line.
50 Or zero, which disables the optimization for the current frame line. */
51 static int this_line_bufpos
;
53 /* Number of characters past the end of this line,
54 including the terminating newline */
55 static int this_line_endpos
;
57 /* The vertical position of this frame line. */
58 static int this_line_vpos
;
60 /* Hpos value for start of display on this frame line.
61 Usually zero, but negative if first character really began
63 static int this_line_start_hpos
;
65 /* Buffer that this_line variables are describing. */
66 static struct buffer
*this_line_buffer
;
68 /* Set by try_window_id to the vpos of first of any lines
69 scrolled on to the bottom of the frame. These lines should
70 not be included in any general scroll computation. */
71 static int scroll_bottom_vpos
;
73 /* Value of echo_area_glyphs when it was last acted on.
74 If this is nonzero, there is a message on the frame
75 in the minibuffer and it should be erased as soon
76 as it is no longer requested to appear. */
77 char *previous_echo_glyphs
;
79 /* Nonzero means truncate lines in all windows less wide than the frame */
80 int truncate_partial_width_windows
;
82 Lisp_Object Vglobal_mode_string
;
84 /* Marker for where to display an arrow on top of the buffer text. */
85 Lisp_Object Voverlay_arrow_position
;
87 /* String to display for the arrow. */
88 Lisp_Object Voverlay_arrow_string
;
90 /* Values of those variables at last redisplay. */
91 static Lisp_Object last_arrow_position
, last_arrow_string
;
93 /* Nonzero if overlay arrow has been displayed once in this window. */
94 static int overlay_arrow_seen
;
96 /* Nonzero means highlight the region even in nonselected windows. */
97 static int highlight_nonselected_windows
;
99 /* If cursor motion alone moves point off frame,
100 Try scrolling this many lines up or down if that will bring it back. */
103 /* Nonzero if try_window_id has made blank lines at window bottom
104 since the last redisplay that paused */
105 static int blank_end_of_window
;
107 /* Number of windows showing the buffer of the selected window.
108 keyboard.c refers to this. */
111 /* display_text_line sets these to the frame position (origin 0) of point,
112 whether the window is selected or not.
113 Set one to -1 first to determine whether point was found afterwards. */
115 static int cursor_vpos
;
116 static int cursor_hpos
;
120 /* Nonzero means display mode line highlighted */
121 int mode_line_inverse_video
;
123 static void echo_area_display ();
124 void mark_window_display_accurate ();
125 static void redisplay_windows ();
126 static void redisplay_window ();
127 static void update_menu_bars ();
128 static void update_menu_bar ();
129 static void try_window ();
130 static int try_window_id ();
131 static struct position
*display_text_line ();
132 static void display_mode_line ();
133 static int display_mode_element ();
134 static char *fmodetrunc ();
135 static char *decode_mode_spec ();
136 static int display_string ();
137 static void display_menu_bar ();
138 static int display_count_lines ();
140 /* Prompt to display in front of the minibuffer contents */
141 char *minibuf_prompt
;
143 /* Width in columns of current minibuffer prompt. */
144 int minibuf_prompt_width
;
146 /* Message to display instead of minibuffer contents
147 This is what the functions error and message make,
148 and command echoing uses it as well.
149 It overrides the minibuf_prompt as well as the buffer. */
150 char *echo_area_glyphs
;
152 /* This is the length of the message in echo_area_glyphs. */
153 int echo_area_glyphs_length
;
155 /* true iff we should redraw the mode lines on the next redisplay */
156 int update_mode_lines
;
158 /* Smallest number of characters before the gap
159 at any time since last redisplay that finished.
160 Valid for current buffer when try_window_id can be called. */
163 /* Smallest number of characters after the gap
164 at any time since last redisplay that finished.
165 Valid for current buffer when try_window_id can be called. */
168 /* MODIFF as of last redisplay that finished;
169 if it matches MODIFF, beg_unchanged and end_unchanged
170 contain no useful information */
171 int unchanged_modified
;
173 /* Nonzero if head_clip or tail_clip of current buffer has changed
174 since last redisplay that finished */
177 /* Nonzero if window sizes or contents have changed
178 since last redisplay that finished */
179 int windows_or_buffers_changed
;
181 /* Nonzero after display_mode_line if %l was used
182 and it displayed a line number. */
183 int line_number_displayed
;
185 /* Maximum buffer size for which to display line numbers. */
186 int line_number_display_limit
;
188 /* Specify m, a string, as a message in the minibuf. If m is 0, clear out
189 any existing message, and let the minibuffer text show through. */
197 if (noninteractive_need_newline
)
199 noninteractive_need_newline
= 0;
200 if (cursor_in_echo_area
!= 0)
201 fprintf (stderr
, "%s", m
);
203 fprintf (stderr
, "%s\n", m
);
206 /* A null message buffer means that the frame hasn't really been
207 initialized yet. Error messages get reported properly by
208 cmd_error, so this must be just an informative message; toss it. */
209 else if (INTERACTIVE
&& FRAME_MESSAGE_BUF (selected_frame
))
212 Lisp_Object minibuf_frame
;
214 choose_minibuf_frame ();
215 minibuf_frame
= WINDOW_FRAME (XWINDOW (minibuf_window
));
216 FRAME_SAMPLE_VISIBILITY (XFRAME (minibuf_frame
));
217 if (FRAME_VISIBLE_P (selected_frame
)
218 && ! FRAME_VISIBLE_P (XFRAME (minibuf_frame
)))
219 Fmake_frame_visible (WINDOW_FRAME (XWINDOW (minibuf_window
)));
224 echo_area_glyphs
= m
;
225 echo_area_glyphs_length
= strlen (m
);
228 echo_area_glyphs
= previous_echo_glyphs
= 0;
230 do_pending_window_change ();
231 echo_area_display ();
232 update_frame (XFRAME (XWINDOW (minibuf_window
)->frame
), 1, 1);
233 do_pending_window_change ();
237 /* Display an echo area message M with a specified length of LEN chars.
238 This way, null characters can be included. */
247 if (noninteractive_need_newline
)
249 noninteractive_need_newline
= 0;
250 fwrite (m
, len
, 1, stderr
);
251 if (cursor_in_echo_area
== 0)
252 fprintf (stderr
, "\n");
255 /* A null message buffer means that the frame hasn't really been
256 initialized yet. Error messages get reported properly by
257 cmd_error, so this must be just an informative message; toss it. */
258 else if (INTERACTIVE
&& FRAME_MESSAGE_BUF (selected_frame
))
261 Lisp_Object minibuf_frame
;
263 choose_minibuf_frame ();
264 minibuf_frame
= WINDOW_FRAME (XWINDOW (minibuf_window
));
265 FRAME_SAMPLE_VISIBILITY (XFRAME (minibuf_frame
));
266 if (FRAME_VISIBLE_P (selected_frame
)
267 && ! FRAME_VISIBLE_P (XFRAME (minibuf_frame
)))
268 Fmake_frame_visible (WINDOW_FRAME (XWINDOW (minibuf_window
)));
273 echo_area_glyphs
= m
;
274 echo_area_glyphs_length
= len
;
277 echo_area_glyphs
= previous_echo_glyphs
= 0;
279 do_pending_window_change ();
280 echo_area_display ();
281 update_frame (XFRAME (XWINDOW (minibuf_window
)->frame
), 1, 1);
282 do_pending_window_change ();
286 /* Nonzero if FRAME_MESSAGE_BUF (selected_frame) is being used by print;
287 zero if being used by message. */
288 int message_buf_print
;
290 /* Dump an informative message to the minibuf. If m is 0, clear out
291 any existing message, and let the minibuffer text show through. */
294 message (m
, a1
, a2
, a3
)
301 if (noninteractive_need_newline
)
303 noninteractive_need_newline
= 0;
304 fprintf (stderr
, m
, a1
, a2
, a3
);
305 if (cursor_in_echo_area
== 0)
306 fprintf (stderr
, "\n");
310 else if (INTERACTIVE
)
312 /* The frame whose minibuffer we're going to display the message on.
313 It may be larger than the selected frame, so we need
314 to use its buffer, not the selected frame's buffer. */
315 FRAME_PTR echo_frame
;
317 choose_minibuf_frame ();
318 echo_frame
= XFRAME (WINDOW_FRAME (XWINDOW (minibuf_window
)));
320 echo_frame
= selected_frame
;
323 /* A null message buffer means that the frame hasn't really been
324 initialized yet. Error messages get reported properly by
325 cmd_error, so this must be just an informative message; toss it. */
326 if (FRAME_MESSAGE_BUF (echo_frame
))
337 len
= doprnt (FRAME_MESSAGE_BUF (echo_frame
),
338 FRAME_WIDTH (echo_frame
), m
, 0, 3, a
);
340 len
= doprnt (FRAME_MESSAGE_BUF (echo_frame
),
341 FRAME_WIDTH (echo_frame
), m
, 0, 3, &a1
);
342 #endif /* NO_ARG_ARRAY */
344 message2 (FRAME_MESSAGE_BUF (echo_frame
), len
);
349 /* Print should start at the beginning of the message
351 message_buf_print
= 0;
363 choose_minibuf_frame ();
366 f
= XFRAME (WINDOW_FRAME (XWINDOW (minibuf_window
)));
368 if (! FRAME_VISIBLE_P (f
))
373 redraw_garbaged_frames ();
377 if (echo_area_glyphs
|| minibuf_level
== 0)
379 vpos
= XFASTINT (XWINDOW (minibuf_window
)->top
);
380 get_display_line (f
, vpos
, 0);
381 display_string (XWINDOW (minibuf_window
), vpos
,
382 echo_area_glyphs
? echo_area_glyphs
: "",
383 echo_area_glyphs
? echo_area_glyphs_length
: -1,
384 0, 0, 0, FRAME_WIDTH (f
));
386 /* If desired cursor location is on this line, put it at end of text */
387 if (FRAME_CURSOR_Y (f
) == vpos
)
388 FRAME_CURSOR_X (f
) = FRAME_DESIRED_GLYPHS (f
)->used
[vpos
];
390 /* Fill the rest of the minibuffer window with blank lines. */
395 i
< vpos
+ XFASTINT (XWINDOW (minibuf_window
)->height
); i
++)
397 get_display_line (f
, i
, 0);
398 display_string (XWINDOW (minibuf_window
), vpos
,
399 "", 0, 0, 0, 0, FRAME_WIDTH (f
));
403 else if (!EQ (minibuf_window
, selected_window
))
404 windows_or_buffers_changed
++;
406 if (EQ (minibuf_window
, selected_window
))
407 this_line_bufpos
= 0;
409 previous_echo_glyphs
= echo_area_glyphs
;
412 /* Prepare for redisplay by updating menu-bar item lists when appropriate.
413 This can't be done in `redisplay' itself because it can call eval. */
418 register struct window
*w
= XWINDOW (selected_window
);
424 /* Set the visible flags for all frames.
425 Do this before checking for resized or garbaged frames; they want
426 to know if their frames are visible.
427 See the comment in frame.h for FRAME_SAMPLE_VISIBILITY. */
429 Lisp_Object tail
, frame
;
431 FOR_EACH_FRAME (tail
, frame
)
432 FRAME_SAMPLE_VISIBILITY (XFRAME (frame
));
435 /* Notice any pending interrupt request to change frame size. */
436 do_pending_window_change ();
440 redraw_garbaged_frames ();
444 if (clip_changed
|| windows_or_buffers_changed
)
447 /* Detect case that we need to write a star in the mode line. */
448 if (XFASTINT (w
->last_modified
) < MODIFF
449 && XFASTINT (w
->last_modified
) <= current_buffer
->save_modified
)
451 w
->update_mode_line
= Qt
;
452 if (buffer_shared
> 1)
456 all_windows
= update_mode_lines
|| buffer_shared
> 1;
458 /* If specs for an arrow have changed, do thorough redisplay
459 to ensure we remove any arrow that should no longer exist. */
460 if (! EQ (Voverlay_arrow_position
, last_arrow_position
)
461 || ! EQ (Voverlay_arrow_string
, last_arrow_string
))
462 all_windows
= 1, clip_changed
= 1;
464 /* Update the menu bar item lists, if appropriate.
465 This has to be done before any actual redisplay
466 or generation of display lines. */
469 Lisp_Object tail
, frame
;
471 FOR_EACH_FRAME (tail
, frame
)
473 FRAME_PTR f
= XFRAME (frame
);
475 if (FRAME_VISIBLE_P (f
))
476 update_menu_bars (FRAME_ROOT_WINDOW (f
));
479 else if (FRAME_VISIBLE_P (selected_frame
))
480 update_menu_bar (selected_window
);
483 /* Do a frame update, taking possible shortcuts into account.
484 This is the main external entry point for redisplay.
486 If the last redisplay displayed an echo area message and that
487 message is no longer requested, we clear the echo area
488 or bring back the minibuffer if that is in use.
490 Do not call eval from within this function.
491 Calls to eval after the call to echo_area_display would confuse
492 the display_line mechanism and would cause a crash.
493 Calls to eval before that point will work most of the time,
494 but can still lose, because this function
495 can be called from signal handlers; with alarms set up;
496 or with synchronous processes running.
498 See Fcall_process; if you called it from here, it could be
499 entered recursively. */
504 register struct window
*w
= XWINDOW (selected_window
);
508 register int tlbufpos
, tlendpos
;
510 extern int input_pending
;
515 /* Set the visible flags for all frames.
516 Do this before checking for resized or garbaged frames; they want
517 to know if their frames are visible.
518 See the comment in frame.h for FRAME_SAMPLE_VISIBILITY. */
520 Lisp_Object tail
, frame
;
522 FOR_EACH_FRAME (tail
, frame
)
523 FRAME_SAMPLE_VISIBILITY (XFRAME (frame
));
526 /* Notice any pending interrupt request to change frame size. */
527 do_pending_window_change ();
531 redraw_garbaged_frames ();
535 if (clip_changed
|| windows_or_buffers_changed
)
538 /* Detect case that we need to write a star in the mode line. */
539 if (XFASTINT (w
->last_modified
) < MODIFF
540 && XFASTINT (w
->last_modified
) <= current_buffer
->save_modified
)
542 w
->update_mode_line
= Qt
;
543 if (buffer_shared
> 1)
547 FRAME_SCROLL_BOTTOM_VPOS (XFRAME (w
->frame
)) = -1;
549 all_windows
= update_mode_lines
|| buffer_shared
> 1;
551 /* If specs for an arrow have changed, do thorough redisplay
552 to ensure we remove any arrow that should no longer exist. */
553 if (! EQ (Voverlay_arrow_position
, last_arrow_position
)
554 || ! EQ (Voverlay_arrow_string
, last_arrow_string
))
555 all_windows
= 1, clip_changed
= 1;
557 /* Normally the message* functions will have already displayed and
558 updated the echo area, but the frame may have been trashed, or
559 the update may have been preempted, so display the echo area
561 if (echo_area_glyphs
|| previous_echo_glyphs
)
563 echo_area_display ();
567 /* If showing region, and mark has changed, must redisplay whole window. */
568 if (((!NILP (Vtransient_mark_mode
)
569 && !NILP (XBUFFER (w
->buffer
)->mark_active
))
570 != !NILP (w
->region_showing
))
571 || (!NILP (w
->region_showing
)
572 && !EQ (w
->region_showing
,
573 Fmarker_position (XBUFFER (w
->buffer
)->mark
))))
574 this_line_bufpos
= -1;
576 tlbufpos
= this_line_bufpos
;
577 tlendpos
= this_line_endpos
;
578 if (!all_windows
&& tlbufpos
> 0 && NILP (w
->update_mode_line
)
579 && FRAME_VISIBLE_P (XFRAME (w
->frame
))
580 /* Make sure recorded data applies to current buffer, etc */
581 && this_line_buffer
== current_buffer
582 && current_buffer
== XBUFFER (w
->buffer
)
583 && NILP (w
->force_start
)
584 /* Point must be on the line that we have info recorded about */
586 && point
<= Z
- tlendpos
587 /* All text outside that line, including its final newline,
589 && (XFASTINT (w
->last_modified
) >= MODIFF
590 || (beg_unchanged
>= tlbufpos
- 1
592 /* If selective display, can't optimize
593 if the changes start at the beginning of the line. */
594 && ((XTYPE (current_buffer
->selective_display
) == Lisp_Int
595 && XINT (current_buffer
->selective_display
) > 0
596 ? (beg_unchanged
>= tlbufpos
599 && end_unchanged
>= tlendpos
600 && Z
- GPT
>= tlendpos
)))
602 if (tlbufpos
> BEGV
&& FETCH_CHAR (tlbufpos
- 1) != '\n'
604 || FETCH_CHAR (tlbufpos
) == '\n'))
605 /* Former continuation line has disappeared by becoming empty */
607 else if (XFASTINT (w
->last_modified
) < MODIFF
608 || MINI_WINDOW_P (w
))
611 overlay_arrow_seen
= 0;
612 display_text_line (w
, tlbufpos
, this_line_vpos
, this_line_start_hpos
,
613 pos_tab_offset (w
, tlbufpos
));
614 /* If line contains point, is not continued,
615 and ends at same distance from eob as before, we win */
616 if (cursor_vpos
>= 0 && this_line_bufpos
617 && this_line_endpos
== tlendpos
)
619 if (XFASTINT (w
->width
) != FRAME_WIDTH (XFRAME (WINDOW_FRAME (w
))))
620 preserve_other_columns (w
);
626 else if (point
== XFASTINT (w
->last_point
))
630 do_pending_window_change ();
635 /* If highlighting the region, we can't just move the cursor. */
636 else if (! (!NILP (Vtransient_mark_mode
)
637 && !NILP (current_buffer
->mark_active
))
638 && NILP (w
->region_showing
))
640 pos
= *compute_motion (tlbufpos
, 0,
641 XINT (w
->hscroll
) ? 1 - XINT (w
->hscroll
) : 0,
642 point
, 2, - (1 << (SHORTBITS
- 1)),
643 window_internal_width (w
) - 1,
645 pos_tab_offset (w
, tlbufpos
));
648 FRAME_CURSOR_X (selected_frame
)
649 = XFASTINT (w
->left
) + max (pos
.hpos
, 0);
650 FRAME_CURSOR_Y (selected_frame
) = this_line_vpos
;
657 /* Text changed drastically or point moved off of line */
658 cancel_line (this_line_vpos
, selected_frame
);
661 this_line_bufpos
= 0;
662 all_windows
|= buffer_shared
> 1;
666 Lisp_Object tail
, frame
;
668 #ifdef HAVE_X_WINDOWS
669 /* Since we're doing a thorough redisplay, we might as well
670 recompute all our display faces. */
671 clear_face_vector ();
674 /* Recompute # windows showing selected buffer.
675 This will be incremented each time such a window is displayed. */
678 FOR_EACH_FRAME (tail
, frame
)
680 FRAME_PTR f
= XFRAME (frame
);
682 /* Mark all the scroll bars to be removed; we'll redeem the ones
683 we want when we redisplay their windows. */
684 if (condemn_scroll_bars_hook
)
685 (*condemn_scroll_bars_hook
) (f
);
687 if (FRAME_VISIBLE_P (f
))
688 redisplay_windows (FRAME_ROOT_WINDOW (f
));
690 /* Any scroll bars which redisplay_windows should have nuked
691 should now go away. */
692 if (judge_scroll_bars_hook
)
693 (*judge_scroll_bars_hook
) (f
);
696 else if (FRAME_VISIBLE_P (selected_frame
))
698 redisplay_window (selected_window
, 1);
699 if (XFASTINT (w
->width
) != FRAME_WIDTH (selected_frame
))
700 preserve_other_columns (w
);
704 /* Prevent various kinds of signals during display update.
705 stdio is not robust about handling signals,
706 which can cause an apparent I/O error. */
718 for (tail
= Vframe_list
; CONSP (tail
); tail
= XCONS (tail
)->cdr
)
722 if (XTYPE (XCONS (tail
)->car
) != Lisp_Frame
)
725 f
= XFRAME (XCONS (tail
)->car
);
726 if (FRAME_VISIBLE_P (f
))
728 pause
|= update_frame (f
, 0, 0);
730 mark_window_display_accurate (f
->root_window
, 1);
735 #endif /* MULTI_FRAME */
737 if (FRAME_VISIBLE_P (selected_frame
))
738 pause
= update_frame (selected_frame
, 0, 0);
740 /* We may have called echo_area_display at the top of this
741 function. If the echo area is on another frame, that may
742 have put text on a frame other than the selected one, so the
743 above call to update_frame would not have caught it. Catch
746 FRAME_PTR mini_frame
=
747 XFRAME (WINDOW_FRAME (XWINDOW (minibuf_window
)));
749 if (mini_frame
!= selected_frame
)
750 pause
|= update_frame (mini_frame
, 0, 0);
754 /* If frame does not match, prevent doing single-line-update next time.
755 Also, don't forget to check every line to update the arrow. */
758 this_line_bufpos
= 0;
759 if (!NILP (last_arrow_position
))
761 last_arrow_position
= Qt
;
762 last_arrow_string
= Qt
;
764 /* If we pause after scrolling, some lines in current_frame
765 may be null, so preserve_other_columns won't be able to
766 preserve all the vertical-bar separators. So, avoid using it
768 if (XFASTINT (w
->width
) != FRAME_WIDTH (selected_frame
))
769 update_mode_lines
= 1;
772 /* Now text on frame agrees with windows, so
773 put info into the windows for partial redisplay to follow */
777 register struct buffer
*b
= XBUFFER (w
->buffer
);
779 blank_end_of_window
= 0;
781 unchanged_modified
= BUF_MODIFF (b
);
782 beg_unchanged
= BUF_GPT (b
) - BUF_BEG (b
);
783 end_unchanged
= BUF_Z (b
) - BUF_GPT (b
);
785 XFASTINT (w
->last_point
) = BUF_PT (b
);
786 XFASTINT (w
->last_point_x
) = FRAME_CURSOR_X (selected_frame
);
787 XFASTINT (w
->last_point_y
) = FRAME_CURSOR_Y (selected_frame
);
790 mark_window_display_accurate (FRAME_ROOT_WINDOW (selected_frame
), 1);
793 w
->update_mode_line
= Qnil
;
794 XFASTINT (w
->last_modified
) = BUF_MODIFF (b
);
795 w
->window_end_valid
= Qt
;
796 last_arrow_position
= Voverlay_arrow_position
;
797 last_arrow_string
= Voverlay_arrow_string
;
799 update_mode_lines
= 0;
800 windows_or_buffers_changed
= 0;
803 /* Start SIGIO interrupts coming again.
804 Having them off during the code above
805 makes it less likely one will discard output,
806 but not impossible, since there might be stuff
807 in the system buffer here.
808 But it is much hairier to try to do anything about that. */
814 /* Change frame size now if a change is pending. */
815 do_pending_window_change ();
818 /* Redisplay, but leave alone any recent echo area message
819 unless another message has been requested in its place.
821 This is useful in situations where you need to redisplay but no
822 user action has occurred, making it inappropriate for the message
823 area to be cleared. See tracking_off and
824 wait_reading_process_input for examples of these situations. */
826 redisplay_preserve_echo_area ()
828 if (echo_area_glyphs
== 0 && previous_echo_glyphs
!= 0)
830 echo_area_glyphs
= previous_echo_glyphs
;
832 echo_area_glyphs
= 0;
839 mark_window_display_accurate (window
, flag
)
843 register struct window
*w
;
845 for (;!NILP (window
); window
= w
->next
)
847 if (XTYPE (window
) != Lisp_Window
) abort ();
848 w
= XWINDOW (window
);
850 if (!NILP (w
->buffer
))
852 XFASTINT (w
->last_modified
)
854 : XBUFFER (w
->buffer
) == current_buffer
855 ? MODIFF
: BUF_MODIFF (XBUFFER (w
->buffer
));
857 /* Record if we are showing a region, so can make sure to
858 update it fully at next redisplay. */
859 w
->region_showing
= (!NILP (Vtransient_mark_mode
)
860 && !NILP (XBUFFER (w
->buffer
)->mark_active
)
861 ? Fmarker_position (XBUFFER (w
->buffer
)->mark
)
865 w
->window_end_valid
= Qt
;
866 w
->update_mode_line
= Qnil
;
868 if (!NILP (w
->vchild
))
869 mark_window_display_accurate (w
->vchild
, flag
);
870 if (!NILP (w
->hchild
))
871 mark_window_display_accurate (w
->hchild
, flag
);
876 last_arrow_position
= Voverlay_arrow_position
;
877 last_arrow_string
= Voverlay_arrow_string
;
881 /* t is unequal to any useful value of Voverlay_arrow_... */
882 last_arrow_position
= Qt
;
883 last_arrow_string
= Qt
;
887 /* Update the menu bar item lists for WINDOW
888 and its subwindows and siblings.
889 This has to be done before we start to fill in any display lines,
890 because it can call eval. */
893 update_menu_bars (window
)
896 for (; !NILP (window
); window
= XWINDOW (window
)->next
)
897 update_menu_bar (window
, 0);
900 /* Update the menu bar item list for window WINDOW and its subwindows. */
903 update_menu_bar (window
, just_this_one
)
907 register struct window
*w
= XWINDOW (window
);
908 struct buffer
*old
= current_buffer
;
909 FRAME_PTR f
= XFRAME (WINDOW_FRAME (w
));
911 /* If this is a combination window, do its children; that's all. */
913 if (!NILP (w
->vchild
))
915 update_menu_bars (w
->vchild
);
918 if (!NILP (w
->hchild
))
920 update_menu_bars (w
->hchild
);
923 if (NILP (w
->buffer
))
926 if (update_mode_lines
)
927 w
->update_mode_line
= Qt
;
929 /* When we reach a frame's selected window, redo the frame's menu bar. */
930 if (!NILP (w
->update_mode_line
)
931 && FRAME_MENU_BAR_LINES (f
) > 0
932 && EQ (FRAME_SELECTED_WINDOW (f
), window
))
934 /* If the user has switched buffers or windows, we need to
935 recompute to reflect the new bindings. But we'll
936 recompute when update_mode_lines is set too; that means
937 that people can use force-mode-line-update to request
938 that the menu bar be recomputed. The adverse effect on
939 the rest of the redisplay algorithm is about the same as
940 windows_or_buffers_changed anyway. */
941 if (windows_or_buffers_changed
943 || (XFASTINT (w
->last_modified
) < MODIFF
944 && (XFASTINT (w
->last_modified
)
945 <= XBUFFER (w
->buffer
)->save_modified
)))
947 struct buffer
*prev
= current_buffer
;
948 current_buffer
= XBUFFER (w
->buffer
);
949 FRAME_MENU_BAR_ITEMS (f
) = menu_bar_items ();
950 current_buffer
= prev
;
957 /* Redisplay WINDOW and its subwindows and siblings. */
960 redisplay_windows (window
)
963 for (; !NILP (window
); window
= XWINDOW (window
)->next
)
964 redisplay_window (window
, 0);
967 /* Redisplay window WINDOW and its subwindows. */
970 redisplay_window (window
, just_this_one
)
974 register struct window
*w
= XWINDOW (window
);
975 FRAME_PTR f
= XFRAME (WINDOW_FRAME (w
));
977 register int lpoint
= point
;
978 struct buffer
*old
= current_buffer
;
979 register int width
= window_internal_width (w
) - 1;
981 register int hscroll
= XINT (w
->hscroll
);
985 int window_needs_modeline
;
987 if (FRAME_HEIGHT (f
) == 0) abort (); /* Some bug zeros some core */
989 /* If this is a combination window, do its children; that's all. */
991 if (!NILP (w
->vchild
))
993 redisplay_windows (w
->vchild
);
996 if (!NILP (w
->hchild
))
998 redisplay_windows (w
->hchild
);
1001 if (NILP (w
->buffer
))
1004 height
= window_internal_height (w
);
1006 if (MINI_WINDOW_P (w
))
1008 if (w
== XWINDOW (minibuf_window
))
1010 if (echo_area_glyphs
)
1011 /* We've already displayed the echo area glyphs, if any. */
1012 goto finish_scroll_bars
;
1016 /* This is a minibuffer, but it's not the currently active one, so
1018 int vpos
= XFASTINT (XWINDOW (FRAME_MINIBUF_WINDOW (f
))->top
);
1021 for (i
= 0; i
< height
; i
++)
1023 get_display_line (f
, vpos
+ i
, 0);
1024 display_string (w
, vpos
+ i
, "", 0, 0, 0, 0, width
);
1027 goto finish_scroll_bars
;
1031 if (update_mode_lines
)
1032 w
->update_mode_line
= Qt
;
1034 /* Otherwise set up data on this window; select its buffer and point value */
1036 current_buffer
= XBUFFER (w
->buffer
);
1039 /* Count number of windows showing the selected buffer. */
1042 && current_buffer
== XBUFFER (XWINDOW (selected_window
)->buffer
))
1045 /* POINT refers normally to the selected window.
1046 For any other window, set up appropriate value. */
1048 if (!EQ (window
, selected_window
))
1050 SET_PT (marker_position (w
->pointm
));
1054 Fset_marker (w
->pointm
, make_number (point
), Qnil
);
1056 else if (point
> (ZV
- 1))
1059 Fset_marker (w
->pointm
, make_number (point
), Qnil
);
1063 /* If window-start is screwed up, choose a new one. */
1064 if (XMARKER (w
->start
)->buffer
!= current_buffer
)
1067 startp
= marker_position (w
->start
);
1069 /* Handle case where place to start displaying has been specified,
1070 unless the specified location is outside the accessible range. */
1071 if (!NILP (w
->force_start
))
1073 /* Forget any recorded base line for line number display. */
1074 w
->base_line_number
= Qnil
;
1075 w
->update_mode_line
= Qt
;
1076 w
->force_start
= Qnil
;
1077 XFASTINT (w
->last_modified
) = 0;
1078 if (startp
< BEGV
) startp
= BEGV
;
1079 if (startp
> ZV
) startp
= ZV
;
1080 try_window (window
, startp
);
1081 if (cursor_vpos
< 0)
1083 /* ??? What should happen here if highlighting a region? */
1084 /* If point does not appear, move point so it does appear */
1085 pos
= *compute_motion (startp
, 0,
1086 ((EQ (window
, minibuf_window
) && startp
== 1)
1087 ? minibuf_prompt_width
: 0)
1089 (hscroll
? 1 - hscroll
: 0),
1091 - (1 << (SHORTBITS
- 1)),
1092 width
, hscroll
, pos_tab_offset (w
, startp
));
1093 SET_PT (pos
.bufpos
);
1094 if (w
!= XWINDOW (selected_window
))
1095 Fset_marker (w
->pointm
, make_number (point
), Qnil
);
1099 FRAME_CURSOR_X (f
) = max (0, pos
.hpos
) + XFASTINT (w
->left
);
1100 FRAME_CURSOR_Y (f
) = pos
.vpos
+ XFASTINT (w
->top
);
1106 /* Handle case where text has not changed, only point,
1107 and it has not moved off the frame */
1109 /* This code is not used for minibuffer for the sake of
1110 the case of redisplaying to replace an echo area message;
1111 since in that case the minibuffer contents per se are usually unchanged.
1112 This code is of no real use in the minibuffer since
1113 the handling of this_line_bufpos, etc.,
1114 in redisplay handles the same cases. */
1116 if (XFASTINT (w
->last_modified
) >= MODIFF
1117 && point
>= startp
&& !clip_changed
1118 && (just_this_one
|| XFASTINT (w
->width
) == FRAME_WIDTH (f
))
1119 /* Can't use this case if highlighting a region. */
1120 && !(!NILP (Vtransient_mark_mode
) && !NILP (current_buffer
->mark_active
))
1121 && NILP (w
->region_showing
)
1122 && !EQ (window
, minibuf_window
))
1124 pos
= *compute_motion (startp
, 0, (hscroll
? 1 - hscroll
: 0),
1125 point
, height
+ 1, 10000, width
, hscroll
,
1126 pos_tab_offset (w
, startp
));
1128 if (pos
.vpos
< height
)
1130 /* Ok, point is still on frame */
1131 if (w
== XWINDOW (FRAME_SELECTED_WINDOW (f
)))
1133 /* These variables are supposed to be origin 1 */
1134 FRAME_CURSOR_X (f
) = max (0, pos
.hpos
) + XFASTINT (w
->left
);
1135 FRAME_CURSOR_Y (f
) = pos
.vpos
+ XFASTINT (w
->top
);
1137 /* This doesn't do the trick, because if a window to the right of
1138 this one must be redisplayed, this does nothing because there
1139 is nothing in DesiredFrame yet, and then the other window is
1140 redisplayed, making likes that are empty in this window's columns.
1141 if (XFASTINT (w->width) != FRAME_WIDTH (f))
1142 preserve_my_columns (w);
1146 /* Don't bother trying redisplay with same start;
1147 we already know it will lose */
1149 /* If current starting point was originally the beginning of a line
1150 but no longer is, find a new starting point. */
1151 else if (!NILP (w
->start_at_line_beg
)
1153 || FETCH_CHAR (startp
- 1) == '\n'))
1157 else if (just_this_one
&& !MINI_WINDOW_P (w
)
1159 && XFASTINT (w
->last_modified
)
1160 /* or else vmotion on first line won't work. */
1161 && ! NILP (w
->start_at_line_beg
)
1162 && ! EQ (w
->window_end_valid
, Qnil
)
1163 && do_id
&& !clip_changed
1164 && !blank_end_of_window
1165 && XFASTINT (w
->width
) == FRAME_WIDTH (f
)
1166 /* Can't use this case if highlighting a region. */
1167 && !(!NILP (Vtransient_mark_mode
)
1168 && !NILP (current_buffer
->mark_active
))
1169 && NILP (w
->region_showing
)
1170 && EQ (last_arrow_position
, Voverlay_arrow_position
)
1171 && EQ (last_arrow_string
, Voverlay_arrow_string
)
1172 && (tem
= try_window_id (FRAME_SELECTED_WINDOW (f
)))
1175 /* tem > 0 means success. tem == -1 means choose new start.
1176 tem == -2 means try again with same start,
1177 and nothing but whitespace follows the changed stuff.
1178 tem == 0 means try again with same start. */
1182 else if (startp
>= BEGV
&& startp
<= ZV
1183 /* Avoid starting display at end of buffer! */
1184 && (startp
< ZV
|| startp
== BEGV
1185 || (XFASTINT (w
->last_modified
) >= MODIFF
)))
1187 /* Try to redisplay starting at same place as before */
1188 /* If point has not moved off frame, accept the results */
1189 try_window (window
, startp
);
1190 if (cursor_vpos
>= 0)
1192 if (!just_this_one
|| clip_changed
|| beg_unchanged
< startp
)
1193 /* Forget any recorded base line for line number display. */
1194 w
->base_line_number
= Qnil
;
1198 cancel_my_columns (w
);
1201 XFASTINT (w
->last_modified
) = 0;
1202 w
->update_mode_line
= Qt
;
1204 /* Try to scroll by specified few lines */
1206 if (scroll_step
&& !clip_changed
)
1210 pos
= *vmotion (Z
- XFASTINT (w
->window_end_pos
),
1211 scroll_step
, width
, hscroll
, window
);
1212 if (pos
.vpos
>= height
)
1216 pos
= *vmotion (startp
, point
< startp
? - scroll_step
: scroll_step
,
1217 width
, hscroll
, window
);
1219 if (point
>= pos
.bufpos
)
1221 try_window (window
, pos
.bufpos
);
1222 if (cursor_vpos
>= 0)
1224 if (!just_this_one
|| clip_changed
|| beg_unchanged
< startp
)
1225 /* Forget any recorded base line for line number display. */
1226 w
->base_line_number
= Qnil
;
1230 cancel_my_columns (w
);
1235 /* Finally, just choose place to start which centers point */
1238 /* Forget any previously recorded base line for line number display. */
1239 w
->base_line_number
= Qnil
;
1241 pos
= *vmotion (point
, - height
/ 2, width
, hscroll
, window
);
1242 try_window (window
, pos
.bufpos
);
1244 startp
= marker_position (w
->start
);
1245 w
->start_at_line_beg
=
1246 (startp
== BEGV
|| FETCH_CHAR (startp
- 1) == '\n') ? Qt
: Qnil
;
1249 if ((!NILP (w
->update_mode_line
)
1250 /* If window not full width, must redo its mode line
1251 if the window to its side is being redone */
1252 || (!just_this_one
&& width
< FRAME_WIDTH (f
) - 1)
1253 || INTEGERP (w
->base_line_pos
))
1254 && height
!= XFASTINT (w
->height
))
1255 display_mode_line (w
);
1256 if (! line_number_displayed
1257 && ! BUFFERP (w
->base_line_pos
))
1259 w
->base_line_pos
= Qnil
;
1260 w
->base_line_number
= Qnil
;
1263 /* When we reach a frame's selected window, redo the frame's menu bar. */
1264 if (!NILP (w
->update_mode_line
)
1265 && FRAME_MENU_BAR_LINES (f
) > 0
1266 && EQ (FRAME_SELECTED_WINDOW (f
), window
))
1267 display_menu_bar (w
);
1270 if (FRAME_HAS_VERTICAL_SCROLL_BARS (f
))
1272 int start
, end
, whole
;
1274 /* Calculate the start and end positions for the current window.
1275 At some point, it would be nice to choose between scrollbars
1276 which reflect the whole buffer size, with special markers
1277 indicating narrowing, and scrollbars which reflect only the
1280 Note that minibuffers sometimes aren't displaying any text. */
1281 if (! MINI_WINDOW_P (w
)
1282 || (w
== XWINDOW (minibuf_window
) && ! echo_area_glyphs
))
1285 start
= startp
- BEGV
;
1286 /* I don't think this is guaranteed to be right. For the
1287 moment, we'll pretend it is. */
1288 end
= (Z
- XINT (w
->window_end_pos
)) - BEGV
;
1290 if (end
< start
) end
= start
;
1291 if (whole
< (end
- start
)) whole
= end
- start
;
1294 start
= end
= whole
= 0;
1296 /* Indicate what this scroll bar ought to be displaying now. */
1297 (*set_vertical_scroll_bar_hook
) (w
, end
- start
, whole
, start
);
1299 /* Note that we actually used the scroll bar attached to this window,
1300 so it shouldn't be deleted at the end of redisplay. */
1301 (*redeem_scroll_bar_hook
) (w
);
1305 current_buffer
= old
;
1309 /* Do full redisplay on one window, starting at position `pos'. */
1312 try_window (window
, pos
)
1316 register struct window
*w
= XWINDOW (window
);
1317 register int height
= window_internal_height (w
);
1318 register int vpos
= XFASTINT (w
->top
);
1319 register int last_text_vpos
= vpos
;
1320 int tab_offset
= pos_tab_offset (w
, pos
);
1321 FRAME_PTR f
= XFRAME (w
->frame
);
1322 int width
= window_internal_width (w
) - 1;
1323 struct position val
;
1325 Fset_marker (w
->start
, make_number (pos
), Qnil
);
1327 overlay_arrow_seen
= 0;
1328 val
.hpos
= XINT (w
->hscroll
) ? 1 - XINT (w
->hscroll
) : 0;
1330 while (--height
>= 0)
1332 val
= *display_text_line (w
, pos
, vpos
, val
.hpos
, tab_offset
);
1333 tab_offset
+= width
;
1334 if (val
.vpos
) tab_offset
= 0;
1336 if (pos
!= val
.bufpos
)
1338 /* Next line, unless prev line ended in end of buffer with no cr */
1339 = vpos
- (val
.vpos
&& (FETCH_CHAR (val
.bufpos
- 1) != '\n'
1340 || ! NILP (Fget_text_property (val
.bufpos
-1,
1342 Fcurrent_buffer ()))));
1346 /* If last line is continued in middle of character,
1347 include the split character in the text considered on the frame */
1348 if (val
.hpos
< (XINT (w
->hscroll
) ? 1 - XINT (w
->hscroll
) : 0))
1351 /* If bottom just moved off end of frame, change mode line percentage. */
1352 if (XFASTINT (w
->window_end_pos
) == 0
1354 w
->update_mode_line
= Qt
;
1356 /* Say where last char on frame will be, once redisplay is finished. */
1357 XFASTINT (w
->window_end_pos
) = Z
- pos
;
1358 XFASTINT (w
->window_end_vpos
) = last_text_vpos
- XFASTINT (w
->top
);
1359 /* But that is not valid info until redisplay finishes. */
1360 w
->window_end_valid
= Qnil
;
1363 /* Try to redisplay when buffer is modified locally,
1364 computing insert/delete line to preserve text outside
1365 the bounds of the changes.
1366 Return 1 if successful, 0 if if cannot tell what to do,
1367 or -1 to tell caller to find a new window start,
1368 or -2 to tell caller to do normal redisplay with same window start. */
1371 try_window_id (window
)
1375 register struct window
*w
= XWINDOW (window
);
1376 register int height
= window_internal_height (w
);
1377 FRAME_PTR f
= XFRAME (w
->frame
);
1378 int top
= XFASTINT (w
->top
);
1379 int start
= marker_position (w
->start
);
1380 int width
= window_internal_width (w
) - 1;
1381 int hscroll
= XINT (w
->hscroll
);
1382 int lmargin
= hscroll
> 0 ? 1 - hscroll
: 0;
1384 register int i
, tem
;
1385 int last_text_vpos
= 0;
1388 struct position val
, bp
, ep
, xp
, pp
;
1389 int scroll_amount
= 0;
1391 int tab_offset
, epto
;
1393 if (GPT
- BEG
< beg_unchanged
)
1394 beg_unchanged
= GPT
- BEG
;
1395 if (Z
- GPT
< end_unchanged
)
1396 end_unchanged
= Z
- GPT
;
1398 if (beg_unchanged
+ 1 < start
)
1399 return 0; /* Give up if changes go above top of window */
1401 /* Find position before which nothing is changed. */
1402 bp
= *compute_motion (start
, 0, lmargin
,
1403 beg_unchanged
+ 1, height
+ 1, 0, width
, hscroll
,
1404 pos_tab_offset (w
, start
));
1405 if (bp
.vpos
>= height
)
1407 if (point
< bp
.bufpos
&& !bp
.contin
)
1409 /* All changes are below the frame, and point is on the frame.
1410 We don't need to change the frame at all.
1411 But we need to update window_end_pos to account for
1412 any change in buffer size. */
1413 bp
= *compute_motion (start
, 0, lmargin
,
1415 width
, hscroll
, pos_tab_offset (w
, start
));
1416 XFASTINT (w
->window_end_vpos
) = height
;
1417 XFASTINT (w
->window_end_pos
) = Z
- bp
.bufpos
;
1425 /* Find beginning of that frame line. Must display from there. */
1426 bp
= *vmotion (bp
.bufpos
, 0, width
, hscroll
, window
);
1433 /* If about to start displaying at the beginning of a continuation line,
1434 really start with previous frame line, in case it was not
1435 continued when last redisplayed */
1436 if ((bp
.contin
&& bp
.bufpos
- 1 == beg_unchanged
&& vpos
> 0)
1438 /* Likewise if we have to worry about selective display. */
1439 (XTYPE (current_buffer
->selective_display
) == Lisp_Int
1440 && XINT (current_buffer
->selective_display
) > 0
1441 && bp
.bufpos
- 1 == beg_unchanged
&& vpos
> 0))
1443 bp
= *vmotion (bp
.bufpos
, -1, width
, hscroll
, window
);
1448 if (bp
.contin
&& bp
.hpos
!= lmargin
)
1450 val
.hpos
= bp
.prevhpos
- width
+ lmargin
;
1456 /* Find first visible newline after which no more is changed. */
1457 tem
= find_next_newline (Z
- max (end_unchanged
, Z
- ZV
), 1);
1458 if (XTYPE (current_buffer
->selective_display
) == Lisp_Int
1459 && XINT (current_buffer
->selective_display
) > 0)
1461 && (position_indentation (tem
)
1462 >= XINT (current_buffer
->selective_display
)))
1463 tem
= find_next_newline (tem
, 1);
1465 /* Compute the cursor position after that newline. */
1466 ep
= *compute_motion (pos
, vpos
, val
.hpos
, tem
,
1467 height
, - (1 << (SHORTBITS
- 1)),
1468 width
, hscroll
, pos_tab_offset (w
, bp
.bufpos
));
1470 /* If changes reach past the text available on the frame,
1471 just display rest of frame. */
1472 if (ep
.bufpos
> Z
- XFASTINT (w
->window_end_pos
))
1475 stop_vpos
= ep
.vpos
;
1477 /* If no newline before ep, the line ep is on includes some changes
1478 that must be displayed. Make sure we don't stop before it. */
1479 /* Also, if changes reach all the way until ep.bufpos,
1480 it is possible that something was deleted after the
1481 newline before it, so the following line must be redrawn. */
1482 if (stop_vpos
== ep
.vpos
1483 && (ep
.bufpos
== BEGV
1484 || FETCH_CHAR (ep
.bufpos
- 1) != '\n'
1485 || ep
.bufpos
== Z
- end_unchanged
))
1486 stop_vpos
= ep
.vpos
+ 1;
1489 overlay_arrow_seen
= 0;
1491 /* If changes do not reach to bottom of window,
1492 figure out how much to scroll the rest of the window */
1493 if (stop_vpos
< height
)
1495 /* Now determine how far up or down the rest of the window has moved */
1496 epto
= pos_tab_offset (w
, ep
.bufpos
);
1497 xp
= *compute_motion (ep
.bufpos
, ep
.vpos
, ep
.hpos
,
1498 Z
- XFASTINT (w
->window_end_pos
),
1499 10000, 0, width
, hscroll
, epto
);
1500 scroll_amount
= xp
.vpos
- XFASTINT (w
->window_end_vpos
);
1502 /* Is everything on frame below the changes whitespace?
1503 If so, no scrolling is really necessary. */
1504 for (i
= ep
.bufpos
; i
< xp
.bufpos
; i
++)
1506 tem
= FETCH_CHAR (i
);
1507 if (tem
!= ' ' && tem
!= '\n' && tem
!= '\t')
1513 XFASTINT (w
->window_end_vpos
) += scroll_amount
;
1515 /* Before doing any scrolling, verify that point will be on frame. */
1516 if (point
> ep
.bufpos
&& !(point
<= xp
.bufpos
&& xp
.bufpos
< height
))
1518 if (point
<= xp
.bufpos
)
1520 pp
= *compute_motion (ep
.bufpos
, ep
.vpos
, ep
.hpos
,
1521 point
, height
, - (1 << (SHORTBITS
- 1)),
1522 width
, hscroll
, epto
);
1526 pp
= *compute_motion (xp
.bufpos
, xp
.vpos
, xp
.hpos
,
1527 point
, height
, - (1 << (SHORTBITS
- 1)),
1528 width
, hscroll
, pos_tab_offset (w
, xp
.bufpos
));
1530 if (pp
.bufpos
< point
|| pp
.vpos
== height
)
1532 cursor_vpos
= pp
.vpos
+ top
;
1533 cursor_hpos
= pp
.hpos
+ XFASTINT (w
->left
);
1536 if (stop_vpos
- scroll_amount
>= height
1537 || ep
.bufpos
== xp
.bufpos
)
1539 if (scroll_amount
< 0)
1540 stop_vpos
-= scroll_amount
;
1542 /* In this path, we have altered window_end_vpos
1543 and not left it negative.
1544 We must make sure that, in case display is preempted
1545 before the frame changes to reflect what we do here,
1546 further updates will not come to try_window_id
1547 and assume the frame and window_end_vpos match. */
1548 blank_end_of_window
= 1;
1550 else if (!scroll_amount
)
1552 else if (bp
.bufpos
== Z
- end_unchanged
)
1554 /* If reprinting everything is nearly as fast as scrolling,
1555 don't bother scrolling. Can happen if lines are short. */
1556 if (scroll_cost (f
, bp
.vpos
+ top
- scroll_amount
,
1557 top
+ height
- max (0, scroll_amount
),
1559 > xp
.bufpos
- bp
.bufpos
- 20)
1560 /* Return "try normal display with same window-start."
1561 Too bad we can't prevent further scroll-thinking. */
1563 /* If pure deletion, scroll up as many lines as possible.
1564 In common case of killing a line, this can save the
1565 following line from being overwritten by scrolling
1566 and therefore having to be redrawn. */
1567 tem
= scroll_frame_lines (f
, bp
.vpos
+ top
- scroll_amount
,
1568 top
+ height
- max (0, scroll_amount
),
1570 if (!tem
) stop_vpos
= height
;
1572 else if (scroll_amount
)
1574 /* If reprinting everything is nearly as fast as scrolling,
1575 don't bother scrolling. Can happen if lines are short. */
1576 /* Note that if scroll_amount > 0, xp.bufpos - bp.bufpos is an
1577 overestimate of cost of reprinting, since xp.bufpos
1578 would end up below the bottom of the window. */
1579 if (scroll_cost (f
, ep
.vpos
+ top
- scroll_amount
,
1580 top
+ height
- max (0, scroll_amount
),
1582 > xp
.bufpos
- ep
.bufpos
- 20)
1583 /* Return "try normal display with same window-start."
1584 Too bad we can't prevent further scroll-thinking. */
1586 tem
= scroll_frame_lines (f
, ep
.vpos
+ top
- scroll_amount
,
1587 top
+ height
- max (0, scroll_amount
),
1589 if (!tem
) stop_vpos
= height
;
1593 /* In any case, do not display past bottom of window */
1594 if (stop_vpos
>= height
)
1600 /* Handle case where pos is before w->start --
1601 can happen if part of line had been clipped and is not clipped now */
1602 if (vpos
== 0 && pos
< marker_position (w
->start
))
1603 Fset_marker (w
->start
, make_number (pos
), Qnil
);
1605 /* Redisplay the lines where the text was changed */
1606 last_text_vpos
= vpos
;
1607 tab_offset
= pos_tab_offset (w
, pos
);
1608 /* If we are starting display in mid-character, correct tab_offset
1609 to account for passing the line that that character really starts in. */
1610 if (val
.hpos
< lmargin
)
1611 tab_offset
+= width
;
1612 while (vpos
< stop_vpos
)
1614 val
= *display_text_line (w
, pos
, top
+ vpos
++, val
.hpos
, tab_offset
);
1615 tab_offset
+= width
;
1616 if (val
.vpos
) tab_offset
= 0;
1617 if (pos
!= val
.bufpos
)
1619 /* Next line, unless prev line ended in end of buffer with no cr */
1620 = vpos
- (val
.vpos
&& FETCH_CHAR (val
.bufpos
- 1) != '\n');
1624 /* There are two cases:
1625 1) we have displayed down to the bottom of the window
1626 2) we have scrolled lines below stop_vpos by scroll_amount */
1630 /* If last line is continued in middle of character,
1631 include the split character in the text considered on the frame */
1632 if (val
.hpos
< lmargin
)
1634 XFASTINT (w
->window_end_vpos
) = last_text_vpos
;
1635 XFASTINT (w
->window_end_pos
) = Z
- val
.bufpos
;
1638 /* If scrolling made blank lines at window bottom,
1639 redisplay to fill those lines */
1640 if (scroll_amount
< 0)
1642 /* Don't consider these lines for general-purpose scrolling.
1643 That will save time in the scrolling computation. */
1644 FRAME_SCROLL_BOTTOM_VPOS (f
) = xp
.vpos
;
1649 vpos
= height
+ scroll_amount
;
1650 else if (xp
.contin
&& xp
.hpos
!= lmargin
)
1652 val
.hpos
= xp
.prevhpos
- width
+ lmargin
;
1656 blank_end_of_window
= 1;
1657 tab_offset
= pos_tab_offset (w
, pos
);
1658 /* If we are starting display in mid-character, correct tab_offset
1659 to account for passing the line that that character starts in. */
1660 if (val
.hpos
< lmargin
)
1661 tab_offset
+= width
;
1663 while (vpos
< height
)
1665 val
= *display_text_line (w
, pos
, top
+ vpos
++, val
.hpos
, tab_offset
);
1666 tab_offset
+= width
;
1667 if (val
.vpos
) tab_offset
= 0;
1671 /* Here is a case where display_text_line sets cursor_vpos wrong.
1672 Make it be fixed up, below. */
1674 && xp
.bufpos
== point
)
1678 /* If bottom just moved off end of frame, change mode line percentage. */
1679 if (XFASTINT (w
->window_end_pos
) == 0
1681 w
->update_mode_line
= Qt
;
1683 /* Attempt to adjust end-of-text positions to new bottom line */
1686 delta
= height
- xp
.vpos
;
1688 || (delta
> 0 && xp
.bufpos
<= ZV
)
1689 || (delta
== 0 && xp
.hpos
))
1691 val
= *vmotion (Z
- XFASTINT (w
->window_end_pos
),
1692 delta
, width
, hscroll
, window
);
1693 XFASTINT (w
->window_end_pos
) = Z
- val
.bufpos
;
1694 XFASTINT (w
->window_end_vpos
) += val
.vpos
;
1698 w
->window_end_valid
= Qnil
;
1700 /* If point was not in a line that was displayed, find it */
1701 if (cursor_vpos
< 0)
1703 val
= *compute_motion (start
, 0, lmargin
, point
, 10000, 10000,
1704 width
, hscroll
, pos_tab_offset (w
, start
));
1705 /* Admit failure if point is off frame now */
1706 if (val
.vpos
>= height
)
1708 for (vpos
= 0; vpos
< height
; vpos
++)
1709 cancel_line (vpos
+ top
, f
);
1712 cursor_vpos
= val
.vpos
+ top
;
1713 cursor_hpos
= val
.hpos
+ XFASTINT (w
->left
);
1716 FRAME_CURSOR_X (f
) = max (0, cursor_hpos
);
1717 FRAME_CURSOR_Y (f
) = cursor_vpos
;
1721 val
= *compute_motion (start
, 0, lmargin
, ZV
,
1722 height
, - (1 << (SHORTBITS
- 1)),
1723 width
, hscroll
, pos_tab_offset (w
, start
));
1724 if (val
.vpos
!= XFASTINT (w
->window_end_vpos
))
1726 if (XFASTINT (w
->window_end_pos
)
1734 /* Mark a section of BUF as modified, but only for the sake of redisplay.
1735 This is useful for recording changes to overlays.
1737 We increment the buffer's modification timestamp and set the
1738 redisplay caches (windows_or_buffers_changed, beg_unchanged, etc)
1739 as if the region of text between START and END had been modified;
1740 the redisplay code will check this against the windows' timestamps,
1741 and redraw the appropriate area of the buffer.
1743 However, if the buffer is unmodified, we bump the last-save
1744 timestamp as well, so that incrementing the timestamp doesn't fool
1745 Emacs into thinking that the buffer's text has been modified.
1747 Tweaking the timestamps shouldn't hurt the first-modification
1748 timestamps recorded in the undo records; those values aren't
1749 written until just before a real text modification is made, so they
1750 will never catch the timestamp value just before this function gets
1754 redisplay_region (buf
, start
, end
)
1764 start
= end
; end
= temp
;
1767 if (buf
!= current_buffer
)
1768 windows_or_buffers_changed
= 1;
1771 if (unchanged_modified
== MODIFF
)
1773 beg_unchanged
= start
- BEG
;
1774 end_unchanged
= Z
- end
;
1778 if (Z
- end
< end_unchanged
)
1779 end_unchanged
= Z
- end
;
1780 if (start
- BEG
< beg_unchanged
)
1781 beg_unchanged
= start
- BEG
;
1785 /* Increment the buffer's time stamp, but also increment the save
1786 and autosave timestamps, so as not to screw up that timekeeping. */
1787 if (BUF_MODIFF (buf
) == buf
->save_modified
)
1788 buf
->save_modified
++;
1789 if (BUF_MODIFF (buf
) == buf
->auto_save_modified
)
1790 buf
->auto_save_modified
++;
1792 BUF_MODIFF (buf
) ++;
1796 /* Copy glyphs from the vector FROM to the rope T.
1797 But don't actually copy the parts that would come in before S.
1798 Value is T, advanced past the copied data. */
1801 copy_rope (t
, s
, from
, face
)
1802 register GLYPH
*t
; /* Copy to here. */
1803 register GLYPH
*s
; /* Starting point. */
1804 Lisp_Object from
; /* Data to copy; known to be a vector. */
1805 int face
; /* Face to apply to glyphs which don't specify one. */
1807 register int n
= XVECTOR (from
)->size
;
1808 register Lisp_Object
*f
= XVECTOR (from
)->contents
;
1812 int glyph
= XFASTINT (*f
);
1814 if (t
>= s
) *t
= MAKE_GLYPH (GLYPH_CHAR (glyph
),
1816 ? GLYPH_FACE (glyph
)
1824 /* Copy exactly LEN glyphs from FROM into data at T.
1825 But don't alter words before S. */
1828 copy_part_of_rope (t
, s
, from
, len
, face
)
1829 register GLYPH
*t
; /* Copy to here. */
1830 register GLYPH
*s
; /* Starting point. */
1831 Lisp_Object
*from
; /* Data to copy. */
1833 int face
; /* Face to apply to glyphs which don't specify one. */
1836 register Lisp_Object
*f
= from
;
1840 int glyph
= XFASTINT (*f
);
1842 if (t
>= s
) *t
= MAKE_GLYPH (GLYPH_CHAR (glyph
),
1844 ? GLYPH_FACE (glyph
)
1852 /* Display one line of window w, starting at position START in W's buffer.
1853 Display starting at horizontal position HPOS, which is normally zero
1854 or negative. A negative value causes output up to hpos = 0 to be discarded.
1855 This is done for negative hscroll, or when this is a continuation line
1856 and the continuation occurred in the middle of a multi-column character.
1858 TABOFFSET is an offset for ostensible hpos, used in tab stop calculations.
1860 Display on position VPOS on the frame. (origin 0).
1862 Returns a STRUCT POSITION giving character to start next line with
1863 and where to display it, including a zero or negative hpos.
1864 The vpos field is not really a vpos; it is 1 unless the line is continued */
1866 struct position val_display_text_line
;
1868 static struct position
*
1869 display_text_line (w
, start
, vpos
, hpos
, taboffset
)
1876 register int pos
= start
;
1881 register unsigned char *p
;
1883 register GLYPH
*startp
;
1884 register GLYPH
*p1prev
= 0;
1885 FRAME_PTR f
= XFRAME (w
->frame
);
1886 int tab_width
= XINT (current_buffer
->tab_width
);
1887 int ctl_arrow
= !NILP (current_buffer
->ctl_arrow
);
1888 int width
= window_internal_width (w
) - 1;
1889 struct position val
;
1892 int hscroll
= XINT (w
->hscroll
);
1893 int truncate
= hscroll
1894 || (truncate_partial_width_windows
1895 && XFASTINT (w
->width
) < FRAME_WIDTH (f
))
1896 || !NILP (current_buffer
->truncate_lines
);
1898 /* 1 if we should highlight the region. */
1899 int highlight_region
1900 = !NILP (Vtransient_mark_mode
) && !NILP (current_buffer
->mark_active
);
1901 int region_beg
, region_end
;
1904 = XTYPE (current_buffer
->selective_display
) == Lisp_Int
1905 ? XINT (current_buffer
->selective_display
)
1906 : !NILP (current_buffer
->selective_display
) ? -1 : 0;
1907 register struct frame_glyphs
*desired_glyphs
= FRAME_DESIRED_GLYPHS (f
);
1908 register struct Lisp_Vector
*dp
= window_display_table (w
);
1910 Lisp_Object default_invis_vector
[3];
1911 /* Nonzero means display something where there are invisible lines.
1912 The precise value is the number of glyphs to display. */
1914 = (selective
&& dp
&& XTYPE (DISP_INVIS_VECTOR (dp
)) == Lisp_Vector
1915 ? XVECTOR (DISP_INVIS_VECTOR (dp
))->size
1916 : selective
&& !NILP (current_buffer
->selective_display_ellipses
)
1918 /* This is the sequence of Lisp objects to display
1919 when there are invisible lines. */
1920 Lisp_Object
*invis_vector_contents
1921 = (dp
&& XTYPE (DISP_INVIS_VECTOR (dp
)) == Lisp_Vector
1922 ? XVECTOR (DISP_INVIS_VECTOR (dp
))->contents
1923 : default_invis_vector
);
1925 GLYPH truncator
= (dp
== 0 || XTYPE (DISP_TRUNC_GLYPH (dp
)) != Lisp_Int
1926 ? '$' : XINT (DISP_TRUNC_GLYPH (dp
)));
1927 GLYPH continuer
= (dp
== 0 || XTYPE (DISP_CONTINUE_GLYPH (dp
)) != Lisp_Int
1928 ? '\\' : XINT (DISP_CONTINUE_GLYPH (dp
)));
1930 /* The next buffer location at which the face should change, due
1931 to overlays or text property changes. */
1932 int next_face_change
;
1934 #ifdef USE_TEXT_PROPERTIES
1935 /* The next location where the `invisible' property changes */
1939 /* The face we're currently using. */
1940 int current_face
= 0;
1942 XFASTINT (default_invis_vector
[2]) = '.';
1943 default_invis_vector
[0] = default_invis_vector
[1] = default_invis_vector
[2];
1945 hpos
+= XFASTINT (w
->left
);
1946 get_display_line (f
, vpos
, XFASTINT (w
->left
));
1947 if (tab_width
<= 0 || tab_width
> 1000) tab_width
= 8;
1949 /* Show where to highlight the region. */
1950 if (highlight_region
&& XMARKER (current_buffer
->mark
)->buffer
!= 0
1951 /* Maybe highlight only in selected window. */
1952 && (highlight_nonselected_windows
1953 || w
== XWINDOW (selected_window
)))
1955 region_beg
= marker_position (current_buffer
->mark
);
1956 if (PT
< region_beg
)
1958 region_end
= region_beg
;
1963 w
->region_showing
= Qt
;
1966 region_beg
= region_end
= -1;
1968 if (MINI_WINDOW_P (w
) && start
== 1
1969 && vpos
== XFASTINT (w
->top
))
1972 hpos
= display_string (w
, vpos
, minibuf_prompt
, -1, hpos
,
1973 (!truncate
? continuer
: truncator
),
1975 minibuf_prompt_width
= hpos
;
1978 desired_glyphs
->bufp
[vpos
] = pos
;
1979 p1
= desired_glyphs
->glyphs
[vpos
] + hpos
;
1981 startp
= desired_glyphs
->glyphs
[vpos
] + XFASTINT (w
->left
);
1982 endp
= startp
+ width
;
1984 /* Arrange the overlays nicely for our purposes. Usually, we call
1985 display_text_line on only one line at a time, in which case this
1986 can't really hurt too much, or we call it on lines which appear
1987 one after another in the buffer, in which case all calls to
1988 recenter_overlay_lists but the first will be pretty cheap. */
1989 recenter_overlay_lists (current_buffer
, pos
);
1991 /* Loop generating characters.
1992 Stop at end of buffer, before newline,
1993 if reach or pass continuation column,
1994 or at face change. */
1996 next_face_change
= pos
;
1997 #ifdef USE_TEXT_PROPERTIES
1998 next_invisible
= pos
;
2005 /* Did we hit the end of the visible region of the buffer?
2010 /* Did we reach point? Record the cursor location. */
2011 if (pos
== point
&& cursor_vpos
< 0)
2014 cursor_hpos
= p1
- startp
;
2017 #ifdef USE_TEXT_PROPERTIES
2018 /* if the `invisible' property is set to t, we can skip to
2019 the next property change */
2020 while (pos
== next_invisible
&& pos
< end
)
2022 Lisp_Object position
, limit
, endpos
, prop
;
2023 XFASTINT (position
) = pos
;
2024 prop
= Fget_text_property (position
, Qinvisible
,
2025 Fcurrent_buffer ());
2026 /* This is just an estimate to give reasonable
2027 performance; nothing should go wrong if it is too small. */
2028 XFASTINT (limit
) = pos
+ 50;
2030 = Fnext_single_property_change (position
, Qinvisible
,
2031 Fcurrent_buffer (), limit
);
2032 if (INTEGERP (endpos
))
2033 next_invisible
= XINT (endpos
);
2035 next_invisible
= end
;
2038 if (pos
< point
&& next_invisible
>= point
)
2041 cursor_hpos
= p1
- startp
;
2043 pos
= next_invisible
;
2050 #ifdef HAVE_X_WINDOWS
2051 /* Did we hit a face change? Figure out what face we should
2052 use now. We also hit this the first time through the
2053 loop, to see what face we should start with. */
2054 if (pos
>= next_face_change
&& FRAME_X_P (f
))
2055 current_face
= compute_char_face (f
, w
, pos
,
2056 region_beg
, region_end
,
2057 &next_face_change
, pos
+ 50);
2062 #ifdef USE_TEXT_PROPERTIES
2063 if (pos
< next_invisible
&& next_invisible
< pause
)
2064 pause
= next_invisible
;
2066 if (pos
< next_face_change
&& next_face_change
< pause
)
2067 pause
= next_face_change
;
2069 /* Wouldn't you hate to read the next line to someone over
2071 if (pos
< point
&& point
< pause
)
2073 if (pos
< GPT
&& GPT
< pause
)
2076 p
= &FETCH_CHAR (pos
);
2079 if (c
>= 040 && c
< 0177
2080 && (dp
== 0 || XTYPE (DISP_CHAR_VECTOR (dp
, c
)) != Lisp_Vector
))
2083 *p1
= MAKE_GLYPH (c
, current_face
);
2091 && position_indentation (pos
+ 1) >= selective
)
2094 pos
= find_next_newline (pos
+ 1, 1);
2095 if (FETCH_CHAR (pos
- 1) == '\n')
2098 if (invis
&& selective_rlen
> 0 && p1
>= startp
)
2100 p1
+= selective_rlen
;
2101 if (p1
- startp
> width
)
2103 copy_part_of_rope (p1prev
, p1prev
, invis_vector_contents
,
2104 (p1
- p1prev
), current_face
);
2107 /* Draw the face of the newline character as extending all the
2108 way to the end of the frame line. */
2111 *p1
++ = MAKE_GLYPH (' ', current_face
);
2119 if (p1
>= startp
&& p1
< endp
)
2120 *p1
= MAKE_GLYPH (' ', current_face
);
2123 while ((p1
- startp
+ taboffset
+ hscroll
- (hscroll
> 0))
2126 else if (c
== Ctl ('M') && selective
== -1)
2128 pos
= find_next_newline (pos
, 1);
2129 if (FETCH_CHAR (pos
- 1) == '\n')
2131 if (selective_rlen
> 0)
2133 p1
+= selective_rlen
;
2134 if (p1
- startp
> width
)
2136 copy_part_of_rope (p1prev
, p1prev
, invis_vector_contents
,
2137 (p1
- p1prev
), current_face
);
2140 /* Draw the face of the newline character as extending all the
2141 way to the end of the frame line. */
2144 *p1
++ = MAKE_GLYPH (' ', current_face
);
2148 else if (dp
!= 0 && XTYPE (DISP_CHAR_VECTOR (dp
, c
)) == Lisp_Vector
)
2150 p1
= copy_rope (p1
, startp
, DISP_CHAR_VECTOR (dp
, c
), current_face
);
2152 else if (c
< 0200 && ctl_arrow
)
2155 *p1
= MAKE_GLYPH ((dp
&& XTYPE (DISP_CTRL_GLYPH (dp
)) == Lisp_Int
2156 ? XINT (DISP_CTRL_GLYPH (dp
)) : '^'),
2159 if (p1
>= startp
&& p1
< endp
)
2160 *p1
= MAKE_GLYPH (c
^ 0100, current_face
);
2166 *p1
= MAKE_GLYPH ((dp
&& XTYPE (DISP_ESCAPE_GLYPH (dp
)) == Lisp_Int
2167 ? XINT (DISP_ESCAPE_GLYPH (dp
)) : '\\'),
2170 if (p1
>= startp
&& p1
< endp
)
2171 *p1
= MAKE_GLYPH ((c
>> 6) + '0', current_face
);
2173 if (p1
>= startp
&& p1
< endp
)
2174 *p1
= MAKE_GLYPH ((7 & (c
>> 3)) + '0', current_face
);
2176 if (p1
>= startp
&& p1
< endp
)
2177 *p1
= MAKE_GLYPH ((7 & c
) + '0', current_face
);
2184 val
.hpos
= - XINT (w
->hscroll
);
2192 /* Handle continuation in middle of a character */
2193 /* by backing up over it */
2196 /* Don't back up if we never actually displayed any text.
2197 This occurs when the minibuffer prompt takes up the whole line. */
2200 /* Start the next line with that same character */
2202 /* but at negative hpos, to skip the columns output on this line. */
2203 val
.hpos
+= p1prev
- endp
;
2206 /* Keep in this line everything up to the continuation column. */
2210 /* Finish deciding which character to start the next line on,
2211 and what hpos to start it at.
2212 Also set `lastpos' to the last position which counts as "on this line"
2213 for cursor-positioning. */
2217 if (FETCH_CHAR (pos
) == '\n')
2218 /* If stopped due to a newline, start next line after it */
2221 /* Stopped due to right margin of window */
2226 /* Truncating => start next line after next newline,
2227 and point is on this line if it is before the newline,
2228 and skip none of first char of next line */
2229 pos
= find_next_newline (pos
, 1);
2230 val
.hpos
= XINT (w
->hscroll
) ? 1 - XINT (w
->hscroll
) : 0;
2232 lastpos
= pos
- (FETCH_CHAR (pos
- 1) == '\n');
2243 /* If point is at eol or in invisible text at eol,
2244 record its frame location now. */
2246 if (start
<= point
&& point
<= lastpos
&& cursor_vpos
< 0)
2249 cursor_hpos
= p1
- startp
;
2252 if (cursor_vpos
== vpos
)
2254 if (cursor_hpos
< 0) cursor_hpos
= 0;
2255 if (cursor_hpos
> width
) cursor_hpos
= width
;
2256 cursor_hpos
+= XFASTINT (w
->left
);
2257 if (w
== XWINDOW (FRAME_SELECTED_WINDOW (f
)))
2259 FRAME_CURSOR_Y (f
) = cursor_vpos
;
2260 FRAME_CURSOR_X (f
) = cursor_hpos
;
2262 if (w
== XWINDOW (selected_window
))
2264 /* Line is not continued and did not start
2265 in middle of character */
2266 if ((hpos
- XFASTINT (w
->left
)
2267 == (XINT (w
->hscroll
) ? 1 - XINT (w
->hscroll
) : 0))
2270 this_line_bufpos
= start
;
2271 this_line_buffer
= current_buffer
;
2272 this_line_vpos
= cursor_vpos
;
2273 this_line_start_hpos
= hpos
;
2274 this_line_endpos
= Z
- lastpos
;
2277 this_line_bufpos
= 0;
2282 /* If hscroll and line not empty, insert truncation-at-left marker */
2283 if (hscroll
&& lastpos
!= start
)
2285 *startp
= truncator
;
2290 if (XFASTINT (w
->width
) + XFASTINT (w
->left
) != FRAME_WIDTH (f
))
2293 if (p1
< startp
) p1
= startp
;
2294 while (p1
< endp
) *p1
++ = SPACEGLYPH
;
2296 /* Don't draw vertical bars if we're using scroll bars. They're
2297 covered up by the scroll bars, and it's distracting to see
2298 them when the scroll bar windows are flickering around to be
2300 *p1
++ = (FRAME_HAS_VERTICAL_SCROLL_BARS (f
)
2303 desired_glyphs
->used
[vpos
] = max (desired_glyphs
->used
[vpos
],
2304 p1
- desired_glyphs
->glyphs
[vpos
]);
2305 desired_glyphs
->glyphs
[vpos
][desired_glyphs
->used
[vpos
]] = 0;
2307 /* If the start of this line is the overlay arrow-position,
2308 then put the arrow string into the display-line. */
2310 if (XTYPE (Voverlay_arrow_position
) == Lisp_Marker
2311 && current_buffer
== XMARKER (Voverlay_arrow_position
)->buffer
2312 && start
== marker_position (Voverlay_arrow_position
)
2313 && XTYPE (Voverlay_arrow_string
) == Lisp_String
2314 && ! overlay_arrow_seen
)
2316 unsigned char *p
= XSTRING (Voverlay_arrow_string
)->data
;
2318 int len
= XSTRING (Voverlay_arrow_string
)->size
;
2323 for (i
= 0; i
< len
; i
++)
2326 /* Bug in SunOS 4.1.1 compiler requires this intermediate variable. */
2327 arrow_end
= (startp
- desired_glyphs
->glyphs
[vpos
]) + len
;
2328 if (desired_glyphs
->used
[vpos
] < arrow_end
)
2329 desired_glyphs
->used
[vpos
] = arrow_end
;
2331 overlay_arrow_seen
= 1;
2335 val_display_text_line
= val
;
2336 return &val_display_text_line
;
2339 /* Redisplay the menu bar in the frame for window W. */
2342 display_menu_bar (w
)
2345 Lisp_Object items
, tail
;
2346 register int vpos
= 0;
2347 register FRAME_PTR f
= XFRAME (WINDOW_FRAME (w
));
2348 int maxendcol
= FRAME_WIDTH (f
);
2351 if (FRAME_MENU_BAR_LINES (f
) <= 0)
2354 get_display_line (f
, vpos
, 0);
2356 for (tail
= FRAME_MENU_BAR_ITEMS (f
); CONSP (tail
); tail
= XCONS (tail
)->cdr
)
2360 string
= XCONS (XCONS (XCONS (tail
)->car
)->cdr
)->car
;
2362 /* Record in each item its hpos. */
2363 XFASTINT (XCONS (XCONS (XCONS (tail
)->car
)->cdr
)->cdr
) = hpos
;
2365 if (hpos
< maxendcol
)
2366 hpos
= display_string (XWINDOW (FRAME_ROOT_WINDOW (f
)), vpos
,
2367 XSTRING (string
)->data
,
2368 XSTRING (string
)->size
,
2369 hpos
, 0, hpos
, maxendcol
);
2370 /* Put a gap of 3 spaces between items. */
2371 if (hpos
< maxendcol
)
2373 int hpos1
= hpos
+ 3;
2374 hpos
= display_string (w
, vpos
, "", 0, hpos
, 0,
2375 min (hpos1
, maxendcol
), maxendcol
);
2379 FRAME_DESIRED_GLYPHS (f
)->bufp
[vpos
] = 0;
2380 FRAME_DESIRED_GLYPHS (f
)->highlight
[vpos
] = mode_line_inverse_video
;
2382 /* Fill out the line with spaces. */
2383 if (maxendcol
> hpos
)
2384 hpos
= display_string (w
, vpos
, "", 0, hpos
, 0, maxendcol
, -1);
2386 /* Clear the rest of the lines allocated to the menu bar. */
2388 while (vpos
< FRAME_MENU_BAR_LINES (f
))
2389 get_display_line (f
, vpos
++, 0);
2392 /* Display the mode line for window w */
2395 display_mode_line (w
)
2398 register int vpos
= XFASTINT (w
->height
) + XFASTINT (w
->top
) - 1;
2399 register int left
= XFASTINT (w
->left
);
2400 register int right
= XFASTINT (w
->width
) + left
;
2401 register FRAME_PTR f
= XFRAME (WINDOW_FRAME (w
));
2403 line_number_displayed
= 0;
2405 get_display_line (f
, vpos
, left
);
2406 display_mode_element (w
, vpos
, left
, 0, right
, right
,
2407 current_buffer
->mode_line_format
);
2408 FRAME_DESIRED_GLYPHS (f
)->bufp
[vpos
] = 0;
2410 /* Make the mode line inverse video if the entire line
2411 is made of mode lines.
2412 I.e. if this window is full width,
2413 or if it is the child of a full width window
2414 (which implies that that window is split side-by-side
2415 and the rest of this line is mode lines of the sibling windows). */
2416 if (XFASTINT (w
->width
) == FRAME_WIDTH (f
)
2417 || XFASTINT (XWINDOW (w
->parent
)->width
) == FRAME_WIDTH (f
))
2418 FRAME_DESIRED_GLYPHS (f
)->highlight
[vpos
] = mode_line_inverse_video
;
2420 #ifdef HAVE_X_WINDOWS
2421 /* I'm trying this out because I saw Unimpress use it, but it's
2422 possible that this may mess adversely with some window managers. -jla
2424 Wouldn't it be nice to use something like mode-line-format to
2425 describe frame titles? -JimB */
2427 /* Change the title of the frame to the name of the buffer displayed
2428 in the currently selected window. Don't do this for minibuffer frames,
2429 and don't do it when there's only one non-minibuffer frame. */
2431 && ! FRAME_MINIBUF_ONLY_P (f
)
2432 && w
== XWINDOW (f
->selected_window
))
2433 x_implicitly_set_name (f
, (EQ (Fnext_frame (WINDOW_FRAME (w
), Qnil
),
2436 : XBUFFER (w
->buffer
)->name
),
2441 /* Contribute ELT to the mode line for window W.
2442 How it translates into text depends on its data type.
2444 VPOS is the position of the mode line being displayed.
2446 HPOS is the position (absolute on frame) where this element's text
2447 should start. The output is truncated automatically at the right
2450 DEPTH is the depth in recursion. It is used to prevent
2451 infinite recursion here.
2453 MINENDCOL is the hpos before which the element may not end.
2454 The element is padded at the right with spaces if nec
2455 to reach this column.
2457 MAXENDCOL is the hpos past which this element may not extend.
2458 If MINENDCOL is > MAXENDCOL, MINENDCOL takes priority.
2459 (This is necessary to make nested padding and truncation work.)
2461 Returns the hpos of the end of the text generated by ELT.
2462 The next element will receive that value as its HPOS arg,
2463 so as to concatenate the elements. */
2466 display_mode_element (w
, vpos
, hpos
, depth
, minendcol
, maxendcol
, elt
)
2468 register int vpos
, hpos
;
2471 register int maxendcol
;
2472 register Lisp_Object elt
;
2480 #ifdef SWITCH_ENUM_BUG
2481 switch ((int) XTYPE (elt
))
2483 switch (XTYPE (elt
))
2488 /* A string: output it and check for %-constructs within it. */
2489 register unsigned char c
;
2490 register unsigned char *this = XSTRING (elt
)->data
;
2492 while (hpos
< maxendcol
&& *this)
2494 unsigned char *last
= this;
2495 while ((c
= *this++) != '\0' && c
!= '%')
2497 if (this - 1 != last
)
2499 register int lim
= --this - last
+ hpos
;
2500 hpos
= display_string (w
, vpos
, last
, -1, hpos
, 0, hpos
,
2501 min (lim
, maxendcol
));
2505 register int spec_width
= 0;
2507 /* We can't allow -ve args due to the "%-" construct */
2508 /* Argument specifies minwidth but not maxwidth
2509 (maxwidth can be specified by
2510 (<negative-number> . <stuff>) mode-line elements) */
2512 while ((c
= *this++) >= '0' && c
<= '9')
2514 spec_width
= spec_width
* 10 + (c
- '0');
2518 if (spec_width
> maxendcol
)
2519 spec_width
= maxendcol
;
2522 hpos
= display_mode_element (w
, vpos
, hpos
, depth
,
2523 spec_width
, maxendcol
,
2524 Vglobal_mode_string
);
2526 hpos
= display_string (w
, vpos
,
2527 decode_mode_spec (w
, c
,
2530 hpos
, 0, spec_width
, maxendcol
);
2537 /* A symbol: process the value of the symbol recursively
2538 as if it appeared here directly. Avoid error if symbol void.
2539 Special case: if value of symbol is a string, output the string
2542 register Lisp_Object tem
;
2543 tem
= Fboundp (elt
);
2546 tem
= Fsymbol_value (elt
);
2547 /* If value is a string, output that string literally:
2548 don't check for % within it. */
2549 if (XTYPE (tem
) == Lisp_String
)
2550 hpos
= display_string (w
, vpos
, XSTRING (tem
)->data
,
2551 XSTRING (tem
)->size
,
2552 hpos
, 0, minendcol
, maxendcol
);
2553 /* Give up right away for nil or t. */
2554 else if (!EQ (tem
, elt
))
2555 { elt
= tem
; goto tail_recurse
; }
2562 register Lisp_Object car
, tem
;
2564 /* A cons cell: three distinct cases.
2565 If first element is a string or a cons, process all the elements
2566 and effectively concatenate them.
2567 If first element is a negative number, truncate displaying cdr to
2568 at most that many characters. If positive, pad (with spaces)
2569 to at least that many characters.
2570 If first element is a symbol, process the cadr or caddr recursively
2571 according to whether the symbol's value is non-nil or nil. */
2572 car
= XCONS (elt
)->car
;
2573 if (XTYPE (car
) == Lisp_Symbol
)
2575 tem
= Fboundp (car
);
2576 elt
= XCONS (elt
)->cdr
;
2577 if (XTYPE (elt
) != Lisp_Cons
)
2579 /* elt is now the cdr, and we know it is a cons cell.
2580 Use its car if CAR has a non-nil value. */
2583 tem
= Fsymbol_value (car
);
2585 { elt
= XCONS (elt
)->car
; goto tail_recurse
; }
2587 /* Symbol's value is nil (or symbol is unbound)
2588 Get the cddr of the original list
2589 and if possible find the caddr and use that. */
2590 elt
= XCONS (elt
)->cdr
;
2593 else if (XTYPE (elt
) != Lisp_Cons
)
2595 elt
= XCONS (elt
)->car
;
2598 else if (XTYPE (car
) == Lisp_Int
)
2600 register int lim
= XINT (car
);
2601 elt
= XCONS (elt
)->cdr
;
2603 /* Negative int means reduce maximum width.
2604 DO NOT change MINENDCOL here!
2605 (20 -10 . foo) should truncate foo to 10 col
2606 and then pad to 20. */
2607 maxendcol
= min (maxendcol
, hpos
- lim
);
2610 /* Padding specified. Don't let it be more than
2613 if (lim
> maxendcol
)
2615 /* If that's more padding than already wanted, queue it.
2616 But don't reduce padding already specified even if
2617 that is beyond the current truncation point. */
2618 if (lim
> minendcol
)
2623 else if (XTYPE (car
) == Lisp_String
|| XTYPE (car
) == Lisp_Cons
)
2625 register int limit
= 50;
2626 /* LIMIT is to protect against circular lists. */
2627 while (XTYPE (elt
) == Lisp_Cons
&& --limit
> 0
2628 && hpos
< maxendcol
)
2630 hpos
= display_mode_element (w
, vpos
, hpos
, depth
,
2633 elt
= XCONS (elt
)->cdr
;
2641 return (display_string (w
, vpos
, "*invalid*", -1, hpos
, 0,
2642 minendcol
, maxendcol
));
2646 if (minendcol
> hpos
)
2647 hpos
= display_string (w
, vpos
, "", 0, hpos
, 0, minendcol
, -1);
2651 /* Return a string for the output of a mode line %-spec for window W,
2652 generated by character C and width MAXWIDTH. */
2654 static char lots_of_dashes
[] = "--------------------------------------------------------------------------------------------------------------------------------------------";
2657 decode_mode_spec (w
, c
, maxwidth
)
2660 register int maxwidth
;
2662 Lisp_Object obj
= Qnil
;
2663 FRAME_PTR f
= XFRAME (WINDOW_FRAME (w
));
2664 char *decode_mode_spec_buf
= (char *) FRAME_TEMP_GLYPHS (f
)->total_contents
;
2666 if (maxwidth
> FRAME_WIDTH (f
))
2667 maxwidth
= FRAME_WIDTH (f
);
2672 obj
= current_buffer
->name
;
2674 if (maxwidth
>= 3 && XSTRING (obj
)->size
> maxwidth
)
2676 bcopy (XSTRING (obj
)->data
, decode_mode_spec_buf
, maxwidth
- 1);
2677 decode_mode_spec_buf
[maxwidth
- 1] = '\\';
2678 decode_mode_spec_buf
[maxwidth
] = '\0';
2679 return decode_mode_spec_buf
;
2685 obj
= current_buffer
->filename
;
2689 else if (XTYPE (obj
) == Lisp_String
&& XSTRING (obj
)->size
> maxwidth
)
2691 bcopy ("...", decode_mode_spec_buf
, 3);
2692 bcopy (XSTRING (obj
)->data
+ XSTRING (obj
)->size
- maxwidth
+ 3,
2693 decode_mode_spec_buf
+ 3, maxwidth
- 3);
2694 return decode_mode_spec_buf
;
2701 int startpos
= marker_position (w
->start
);
2702 int line
, linepos
, topline
;
2705 int height
= XFASTINT (w
->height
);
2707 /* If we decided that this buffer isn't suitable for line numbers,
2708 don't forget that too fast. */
2709 if (EQ (w
->base_line_pos
, w
->buffer
))
2712 /* If the buffer is very big, don't waste time. */
2713 if (ZV
- BEGV
> line_number_display_limit
)
2715 w
->base_line_pos
= Qnil
;
2716 w
->base_line_number
= Qnil
;
2720 if (!NILP (w
->base_line_number
)
2721 && !NILP (w
->base_line_pos
)
2722 && XFASTINT (w
->base_line_pos
) <= marker_position (w
->start
))
2724 line
= XFASTINT (w
->base_line_number
);
2725 linepos
= XFASTINT (w
->base_line_pos
);
2733 /* Count lines from base line to window start position. */
2734 nlines
= display_count_lines (linepos
, startpos
, startpos
, &junk
);
2736 topline
= nlines
+ line
;
2738 /* Determine a new base line, if the old one is too close
2739 or too far away, or if we did not have one.
2740 "Too close" means it's plausible a scroll-down would
2742 if (startpos
== BEGV
)
2744 XFASTINT (w
->base_line_number
) = topline
;
2745 XFASTINT (w
->base_line_pos
) = BEGV
;
2747 else if (nlines
< height
+ 25 || nlines
> height
* 3 + 50
2752 int distance
= (height
* 2 + 30) * 200;
2754 if (startpos
- distance
> limit
)
2755 limit
= startpos
- distance
;
2757 nlines
= display_count_lines (startpos
, limit
,
2760 /* If we couldn't find the lines we wanted within
2762 give up on line numbers for this window. */
2763 if (position
== startpos
- distance
)
2765 w
->base_line_pos
= w
->buffer
;
2766 w
->base_line_number
= Qnil
;
2770 XFASTINT (w
->base_line_number
) = topline
- nlines
;
2771 XFASTINT (w
->base_line_pos
) = position
;
2774 /* Now count lines from the start pos to point. */
2775 nlines
= display_count_lines (startpos
, PT
, PT
, &junk
);
2777 /* Record that we did display the line number. */
2778 line_number_displayed
= 1;
2780 /* Make the string to show. */
2781 sprintf (decode_mode_spec_buf
, "%d", topline
+ nlines
);
2782 return decode_mode_spec_buf
;
2787 obj
= current_buffer
->mode_name
;
2791 if (BEGV
> BEG
|| ZV
< Z
)
2796 if (!NILP (current_buffer
->read_only
))
2798 if (MODIFF
> current_buffer
->save_modified
)
2803 /* status of process */
2804 obj
= Fget_buffer_process (Fcurrent_buffer ());
2806 return "no process";
2807 obj
= Fsymbol_name (Fprocess_status (obj
));
2812 int pos
= marker_position (w
->start
);
2813 int total
= ZV
- BEGV
;
2815 if (XFASTINT (w
->window_end_pos
) <= Z
- ZV
)
2822 else if (pos
<= BEGV
)
2826 total
= ((pos
- BEGV
) * 100 + total
- 1) / total
;
2827 /* We can't normally display a 3-digit number,
2828 so get us a 2-digit number that is close. */
2831 sprintf (decode_mode_spec_buf
, "%2d%%", total
);
2832 return decode_mode_spec_buf
;
2844 if (command_loop_level
> 5)
2846 p
= decode_mode_spec_buf
;
2847 for (i
= 0; i
< command_loop_level
; i
++)
2850 return decode_mode_spec_buf
;
2858 if (command_loop_level
> 5)
2860 p
= decode_mode_spec_buf
;
2861 for (i
= 0; i
< command_loop_level
; i
++)
2864 return decode_mode_spec_buf
;
2872 if (maxwidth
< sizeof (lots_of_dashes
))
2873 return lots_of_dashes
;
2876 for (p
= decode_mode_spec_buf
, i
= maxwidth
; i
> 0; i
--)
2880 return decode_mode_spec_buf
;
2884 if (XTYPE (obj
) == Lisp_String
)
2885 return (char *) XSTRING (obj
)->data
;
2890 /* Count up to N lines starting from FROM.
2891 But don't go beyond LIMIT.
2892 Return the number of lines thus found (always positive).
2893 Store the position after what was found into *POS_PTR. */
2896 display_count_lines (from
, limit
, n
, pos_ptr
)
2909 *pos_ptr
= scan_buffer ('\n', from
, n
, &shortage
);
2915 /* When scanning backwards, scan_buffer stops *after* the last newline
2916 it finds, but does count it. Compensate for that. */
2917 return - n
- shortage
- (*pos_ptr
!= limit
);
2918 return n
- shortage
;
2921 /* Display STRING on one line of window W, starting at HPOS.
2922 Display at position VPOS. Caller should have done get_display_line.
2923 If VPOS == -1, display it as the current frame's title.
2924 LENGTH is the length of STRING, or -1 meaning STRING is null-terminated.
2926 TRUNCATE is GLYPH to display at end if truncated. Zero for none.
2928 MINCOL is the first column ok to end at. (Pad with spaces to this col.)
2929 MAXCOL is the last column ok to end at. Truncate here.
2930 -1 for MINCOL or MAXCOL means no explicit minimum or maximum.
2931 Both count from the left edge of the frame, as does HPOS.
2932 The right edge of W is an implicit maximum.
2933 If TRUNCATE is nonzero, the implicit maximum is one column before the edge.
2935 Returns ending hpos */
2938 display_string (w
, vpos
, string
, length
, hpos
, truncate
, mincol
, maxcol
)
2940 unsigned char *string
;
2948 int hscroll
= XINT (w
->hscroll
);
2949 int tab_width
= XINT (XBUFFER (w
->buffer
)->tab_width
);
2950 register GLYPH
*start
;
2951 register GLYPH
*end
;
2952 FRAME_PTR f
= XFRAME (WINDOW_FRAME (w
));
2953 struct frame_glyphs
*desired_glyphs
= FRAME_DESIRED_GLYPHS (f
);
2954 GLYPH
*p1start
= desired_glyphs
->glyphs
[vpos
] + hpos
;
2955 int window_width
= XFASTINT (w
->width
);
2957 /* Use the standard display table, not the window's display table.
2958 We don't want the mode line in rot13. */
2959 register struct Lisp_Vector
*dp
= 0;
2961 if (XTYPE (Vstandard_display_table
) == Lisp_Vector
2962 && XVECTOR (Vstandard_display_table
)->size
== DISP_TABLE_SIZE
)
2963 dp
= XVECTOR (Vstandard_display_table
);
2965 if (tab_width
<= 0 || tab_width
> 1000) tab_width
= 8;
2968 start
= desired_glyphs
->glyphs
[vpos
] + XFASTINT (w
->left
);
2969 end
= start
+ window_width
- (truncate
!= 0);
2971 if ((window_width
+ XFASTINT (w
->left
)) != FRAME_WIDTH (f
))
2973 if (FRAME_HAS_VERTICAL_SCROLL_BARS (f
))
2977 for (i
= 0; i
< VERTICAL_SCROLL_BAR_WIDTH
; i
++)
2984 if (maxcol
>= 0 && end
- desired_glyphs
->glyphs
[vpos
] > maxcol
)
2985 end
= desired_glyphs
->glyphs
[vpos
] + maxcol
;
2986 if (maxcol
>= 0 && mincol
> maxcol
)
2994 /* Specified length. */
2997 /* Unspecified length (null-terminated string). */
3001 if (c
>= 040 && c
< 0177
3002 && (dp
== 0 || XTYPE (DISP_CHAR_VECTOR (dp
, c
)) != Lisp_Vector
))
3012 if (p1
>= start
&& p1
< end
)
3016 while ((p1
- start
+ hscroll
- (hscroll
> 0)) % tab_width
);
3018 else if (dp
!= 0 && XTYPE (DISP_CHAR_VECTOR (dp
, c
)) == Lisp_Vector
)
3019 p1
= copy_rope (p1
, start
, DISP_CHAR_VECTOR (dp
, c
), 0);
3020 else if (c
< 0200 && ! NILP (buffer_defaults
.ctl_arrow
))
3023 *p1
= (dp
&& XTYPE (DISP_CTRL_GLYPH (dp
)) == Lisp_Int
3024 ? XINT (DISP_CTRL_GLYPH (dp
)) : '^');
3026 if (p1
>= start
&& p1
< end
)
3033 *p1
= (dp
&& XTYPE (DISP_ESCAPE_GLYPH (dp
)) == Lisp_Int
3034 ? XINT (DISP_ESCAPE_GLYPH (dp
)) : '\\');
3036 if (p1
>= start
&& p1
< end
)
3037 *p1
= (c
>> 6) + '0';
3039 if (p1
>= start
&& p1
< end
)
3040 *p1
= (7 & (c
>> 3)) + '0';
3042 if (p1
>= start
&& p1
< end
)
3043 *p1
= (7 & c
) + '0';
3048 if (c
&& length
> 0)
3051 if (truncate
) *p1
++ = truncate
;
3053 else if (mincol
>= 0)
3055 end
= desired_glyphs
->glyphs
[vpos
] + mincol
;
3061 register int len
= p1
- desired_glyphs
->glyphs
[vpos
];
3063 if (len
> desired_glyphs
->used
[vpos
])
3064 desired_glyphs
->used
[vpos
] = len
;
3065 desired_glyphs
->glyphs
[vpos
][desired_glyphs
->used
[vpos
]] = 0;
3074 staticpro (&last_arrow_position
);
3075 staticpro (&last_arrow_string
);
3076 last_arrow_position
= Qnil
;
3077 last_arrow_string
= Qnil
;
3079 DEFVAR_LISP ("global-mode-string", &Vglobal_mode_string
,
3080 "String (or mode line construct) included (normally) in `mode-line-format'.");
3081 Vglobal_mode_string
= Qnil
;
3083 DEFVAR_LISP ("overlay-arrow-position", &Voverlay_arrow_position
,
3084 "Marker for where to display an arrow on top of the buffer text.\n\
3085 This must be the beginning of a line in order to work.\n\
3086 See also `overlay-arrow-string'.");
3087 Voverlay_arrow_position
= Qnil
;
3089 DEFVAR_LISP ("overlay-arrow-string", &Voverlay_arrow_string
,
3090 "String to display as an arrow. See also `overlay-arrow-position'.");
3091 Voverlay_arrow_string
= Qnil
;
3093 DEFVAR_INT ("scroll-step", &scroll_step
,
3094 "*The number of lines to try scrolling a window by when point moves out.\n\
3095 If that fails to bring point back on frame, point is centered instead.\n\
3096 If this is zero, point is always centered after it moves off frame.");
3098 DEFVAR_INT ("debug-end-pos", &debug_end_pos
, "Don't ask");
3100 DEFVAR_BOOL ("truncate-partial-width-windows",
3101 &truncate_partial_width_windows
,
3102 "*Non-nil means truncate lines in all windows less than full frame wide.");
3103 truncate_partial_width_windows
= 1;
3105 DEFVAR_BOOL ("mode-line-inverse-video", &mode_line_inverse_video
,
3106 "*Non-nil means use inverse video for the mode line.");
3107 mode_line_inverse_video
= 1;
3109 DEFVAR_INT ("line-number-display-limit", &line_number_display_limit
,
3110 "*Maximum buffer size for which line number should be displayed.");
3111 line_number_display_limit
= 1000000;
3113 DEFVAR_BOOL ("highlight-nonselected-windows", &highlight_nonselected_windows
,
3114 "*Non-nil means highlight region even in nonselected windows.");
3115 highlight_nonselected_windows
= 1;
3118 /* initialize the window system */
3121 Lisp_Object root_window
;
3122 #ifndef COMPILER_REGISTER_BUG
3124 #endif /* COMPILER_REGISTER_BUG */
3125 struct window
*mini_w
;
3127 this_line_bufpos
= 0;
3129 mini_w
= XWINDOW (minibuf_window
);
3130 root_window
= FRAME_ROOT_WINDOW (XFRAME (WINDOW_FRAME (mini_w
)));
3132 echo_area_glyphs
= 0;
3133 previous_echo_glyphs
= 0;
3135 if (!noninteractive
)
3137 FRAME_PTR f
= XFRAME (WINDOW_FRAME (XWINDOW (root_window
)));
3138 XFASTINT (XWINDOW (root_window
)->top
) = 0;
3139 set_window_height (root_window
, FRAME_HEIGHT (f
) - 1, 0);
3140 XFASTINT (mini_w
->top
) = FRAME_HEIGHT (f
) - 1;
3141 set_window_height (minibuf_window
, 1, 0);
3143 XFASTINT (XWINDOW (root_window
)->width
) = FRAME_WIDTH (f
);
3144 XFASTINT (mini_w
->width
) = FRAME_WIDTH (f
);