src/frame.h

   1 /* Define frame-object for GNU Emacs.
   2    Copyright (C) 1993, 1994 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   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)
   9 any later version.
  10
  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.
  15
  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.  */
  19
  20 \f
  21 /* Miscellanea.  */
  22
  23 /* Nonzero means don't assume anything about current
  24    contents of actual terminal frame */
  25 extern int frame_garbaged;
  26
  27 /* Nonzero means FRAME_MESSAGE_BUF (selected_frame) is being used by
  28    print.  */
  29 extern int message_buf_print;
  30
  31 \f
  32 /* The structure representing a frame.
  33
  34    We declare this even if MULTI_FRAME is not defined, because when
  35    we lack multi-frame support, we use one instance of this structure
  36    to represent the one frame we support.  This is cleaner than
  37    having miscellaneous random variables scattered about.  */
  38
  39 enum output_method
  40 { output_termcap, output_x_window, output_msdos_raw };
  41
  42 struct frame
  43 {
  44   EMACS_INT size;
  45   struct Lisp_Vector *next;
  46
  47   /* All Lisp_Object components must come first.
  48      Only EMACS_INT values can be intermixed with them.
  49      That ensures they are all aligned normally.  */
  50
  51   /* Name of this frame: a Lisp string.  See also `explicit_name'.  */
  52   Lisp_Object name;
  53
  54   /* The frame which should receive keystrokes that occur in this
  55      frame, or nil if they should go to the frame itself.  This is
  56      usually nil, but if the frame is minibufferless, we can use this
  57      to redirect keystrokes to a surrogate minibuffer frame when
  58      needed.
  59
  60      Note that a value of nil is different than having the field point
  61      to the frame itself.  Whenever the Fselect_frame function is used
  62      to shift from one frame to the other, any redirections to the
  63      original frame are shifted to the newly selected frame; if
  64      focus_frame is nil, Fselect_frame will leave it alone.  */
  65   Lisp_Object focus_frame;
  66
  67   /* This frame's root window.  Every frame has one.
  68      If the frame has only a minibuffer window, this is it.
  69      Otherwise, if the frame has a minibuffer window, this is its sibling.  */
  70   Lisp_Object root_window;
  71
  72   /* This frame's selected window.
  73      Each frame has its own window hierarchy
  74      and one of the windows in it is selected within the frame.
  75      The selected window of the selected frame is Emacs's selected window.  */
  76   Lisp_Object selected_window;
  77
  78   /* This frame's minibuffer window.
  79      Most frames have their own minibuffer windows,
  80      but only the selected frame's minibuffer window
  81      can actually appear to exist.  */
  82   Lisp_Object minibuffer_window;
  83
  84   /* Parameter alist of this frame.
  85      These are the parameters specified when creating the frame
  86      or modified with modify-frame-parameters.  */
  87   Lisp_Object param_alist;
  88
  89   /* List of scroll bars on this frame.
  90      Actually, we don't specify exactly what is stored here at all; the
  91      scroll bar implementation code can use it to store anything it likes.
  92      This field is marked by the garbage collector.  It is here
  93      instead of in the `display' structure so that the garbage
  94      collector doesn't need to look inside the window-system-dependent
  95      structure.  */
  96   Lisp_Object scroll_bars;
  97   Lisp_Object condemned_scroll_bars;
  98
  99   /* List of elements to display in the menu bar.
 100      The elements have the form (KEY STRING . nil) to start;
 101      when they are displayed, the hpos of the left edge goes in the cddr.  */
 102   Lisp_Object menu_bar_items;
 103
 104   /* Alist of elements (FACE-NAME . FACE-VECTOR-DATA).  */
 105   Lisp_Object face_alist;
 106
 107   /* A vector that records the entire structure of this frame's menu bar.
 108      For the format of the data, see extensive comments in xmenu.c.
 109      Only the X toolkit version uses this.  */
 110   Lisp_Object menu_bar_vector;
 111   /* Number of elements in the vector that have meaningful data.  */
 112   EMACS_INT menu_bar_items_used;
 113
 114   /* Predicate for selecting buffers for other-buffer.  */
 115   Lisp_Object buffer_predicate;
 116
 117   /* Beyond here, there should be no more Lisp_Object components.  */
 118
 119
 120   /* glyphs as they appear on the frame */
 121   struct frame_glyphs *current_glyphs;
 122
 123   /* glyphs we'd like to appear on the frame */
 124   struct frame_glyphs *desired_glyphs;
 125
 126   /* See do_line_insertion_deletion_costs for info on these arrays. */
 127   /* Cost of inserting 1 line on this frame */
 128   int *insert_line_cost;
 129   /* Cost of deleting 1 line on this frame */
 130   int *delete_line_cost;
 131   /* Cost of inserting n lines on this frame */
 132   int *insert_n_lines_cost;
 133   /* Cost of deleting n lines on this frame */
 134   int *delete_n_lines_cost;
 135
 136   /* glyphs for the mode line */
 137   struct frame_glyphs *temp_glyphs;
 138
 139   /* Intended cursor position of this frame.
 140      Measured in characters, counting from upper left corner
 141      within the frame.  */
 142   int cursor_x;
 143   int cursor_y;
 144
 145   /* Actual cursor position of this frame, and the character under it.
 146      (Not used for terminal frames.)  */
 147   int phys_cursor_x;
 148   int phys_cursor_y;
 149   /* This is handy for undrawing the cursor, because current_glyphs is
 150      not always accurate when in do_scrolling.  */
 151   GLYPH phys_cursor_glyph;
 152
 153   /* Size of this frame, in units of characters.  */
 154   EMACS_INT height;
 155   EMACS_INT width;
 156
 157   /* New height and width for pending size change.  0 if no change pending.  */
 158   int new_height, new_width;
 159
 160   /* The output method says how the contents of this frame
 161      are displayed.  It could be using termcap, or using an X window.  */
 162   enum output_method output_method;
 163
 164   /* A structure of auxiliary data used for displaying the contents.
 165      struct x_display is used for X window frames;
 166      it is defined in xterm.h.  */
 167   union display { struct x_display *x; int nothing; } display;
 168
 169 #ifdef MULTI_KBOARD
 170   /* A pointer to the kboard structure associated with this frame.
 171      For termcap frames, this points to initial_kboard.  For X frames,
 172      it will be the same as display.x->display_info->kboard.  */
 173   KBOARD *kboard;
 174 #endif
 175
 176   /* Number of lines of menu bar.  */
 177   int menu_bar_lines;
 178
 179 #ifdef USE_X_TOOLKIT
 180   /* Nonzero means using a menu bar that comes from the X toolkit.  */
 181   int external_menu_bar;
 182 #endif
 183
 184   /* Nonzero if last attempt at redisplay on this frame was preempted.  */
 185   char display_preempted;
 186
 187   /* visible is nonzero if the frame is currently displayed; we check
 188      it to see if we should bother updating the frame's contents.
 189      DON'T SET IT DIRECTLY; instead, use FRAME_SET_VISIBLE.
 190
 191      Note that, since invisible frames aren't updated, whenever a
 192      frame becomes visible again, it must be marked as garbaged.  The
 193      FRAME_SAMPLE_VISIBILITY macro takes care of this.
 194
 195      iconified is nonzero if the frame is currently iconified.
 196
 197      Asynchronous input handlers should NOT change these directly;
 198      instead, they should change async_visible or async_iconified, and
 199      let the FRAME_SAMPLE_VISIBILITY macro set visible and iconified
 200      at the next redisplay.
 201
 202      These should probably be considered read-only by everyone except
 203      FRAME_SAMPLE_VISIBILITY.
 204
 205      These two are mutually exclusive.  They might both be zero, if the
 206      frame has been made invisible without an icon.  */
 207   char visible, iconified;
 208
 209   /* Asynchronous input handlers change these, and
 210      FRAME_SAMPLE_VISIBILITY copies them into visible and iconified.
 211      See FRAME_SAMPLE_VISIBILITY, below.  */
 212 #ifdef __STDC__
 213   volatile
 214 #endif
 215   char async_visible, async_iconified;
 216
 217   /* Nonzero if this frame should be redrawn.  */
 218 #ifdef __STDC__
 219   volatile
 220 #endif
 221   char garbaged;
 222
 223   /* True if frame actually has a minibuffer window on it.
 224      0 if using a minibuffer window that isn't on this frame.  */
 225   char has_minibuffer;
 226
 227   /* 0 means, if this frame has just one window,
 228      show no modeline for that window.  */
 229   char wants_modeline;
 230
 231   /* Non-zero if the hardware device this frame is displaying on can
 232      support scroll bars.  */
 233   char can_have_scroll_bars;
 234
 235   /* If can_have_scroll_bars is non-zero, this is non-zero if we should
 236      actually display them on this frame.  */
 237   char has_vertical_scroll_bars;
 238
 239   /* Non-0 means raise this frame to the top of the heap when selected.  */
 240   char auto_raise;
 241
 242   /* Non-0 means lower this frame to the bottom of the stack when left.  */
 243   char auto_lower;
 244
 245   /* True if frame's root window can't be split.  */
 246   char no_split;
 247
 248   /* If this is set, then Emacs won't change the frame name to indicate
 249      the current buffer, etcetera.  If the user explicitly sets the frame
 250      name, this gets set.  If the user sets the name to Qnil, this is
 251      cleared.  */
 252   char explicit_name;
 253
 254   /* Nonzero if size of some window on this frame has changed.  */
 255   char window_sizes_changed;
 256
 257   /* Storage for messages to this frame. */
 258   char *message_buf;
 259
 260   /* Nonnegative if current redisplay should not do scroll computation
 261      for lines beyond a certain vpos.  This is the vpos.  */
 262   int scroll_bottom_vpos;
 263
 264   /* Width of the scroll bar, in pixels and in characters.
 265      scroll_bar_cols tracks scroll_bar_pixel_width if the latter is positive;
 266      a zero value in scroll_bar_pixel_width means to compute the actual width
 267      on the fly, using scroll_bar_cols and the current font width.  */
 268   int scroll_bar_pixel_width;
 269   int scroll_bar_cols;
 270
 271   /* The baud rate that was used to calculate costs for this frame.  */
 272   int cost_calculation_baud_rate;
 273 };
 274
 275 #ifdef MULTI_KBOARD  /* Note that MULTI_KBOARD implies MULTI_FRAME */
 276 #define FRAME_KBOARD(f) ((f)->kboard)
 277 #else
 278 #define FRAME_KBOARD(f) (&the_only_kboard)
 279 #endif
 280
 281 #ifdef MULTI_FRAME
 282
 283 typedef struct frame *FRAME_PTR;
 284
 285 #define XFRAME(p) ((struct frame *) XPNTR (p))
 286 #define XSETFRAME(a, b) (XSETPSEUDOVECTOR (a, b, PVEC_FRAME))
 287
 288 #define WINDOW_FRAME(w) (w)->frame
 289
 290 #define FRAME_LIVE_P(f) ((f)->display.nothing != 0)
 291 #define FRAME_TERMCAP_P(f) ((f)->output_method == output_termcap)
 292 #define FRAME_X_P(f) ((f)->output_method == output_x_window)
 293 #define FRAME_MINIBUF_ONLY_P(f) \
 294   EQ (FRAME_ROOT_WINDOW (f), FRAME_MINIBUF_WINDOW (f))
 295 #define FRAME_HAS_MINIBUF_P(f) ((f)->has_minibuffer)
 296 #define FRAME_CURRENT_GLYPHS(f) (f)->current_glyphs
 297 #define FRAME_DESIRED_GLYPHS(f) (f)->desired_glyphs
 298 #define FRAME_TEMP_GLYPHS(f) (f)->temp_glyphs
 299 #define FRAME_HEIGHT(f) (f)->height
 300 #define FRAME_WIDTH(f) (f)->width
 301 #define FRAME_NEW_HEIGHT(f) (f)->new_height
 302 #define FRAME_NEW_WIDTH(f) (f)->new_width
 303 #define FRAME_MENU_BAR_LINES(f) (f)->menu_bar_lines
 304 #ifdef USE_X_TOOLKIT
 305 #define FRAME_EXTERNAL_MENU_BAR(f) (f)->external_menu_bar
 306 #else
 307 #define FRAME_EXTERNAL_MENU_BAR(f) 0
 308 #endif
 309 #define FRAME_CURSOR_X(f) (f)->cursor_x
 310 #define FRAME_CURSOR_Y(f) (f)->cursor_y
 311 #define FRAME_VISIBLE_P(f) ((f)->visible != 0)
 312 #define FRAME_SET_VISIBLE(f,p) \
 313   ((f)->async_visible = (p), FRAME_SAMPLE_VISIBILITY (f))
 314 #define SET_FRAME_GARBAGED(f) (frame_garbaged = 1, f->garbaged = 1)
 315 #define FRAME_GARBAGED_P(f) (f)->garbaged
 316 #define FRAME_NO_SPLIT_P(f) (f)->no_split
 317 #define FRAME_WANTS_MODELINE_P(f) (f)->wants_modeline
 318 #define FRAME_ICONIFIED_P(f) (f)->iconified
 319 #define FRAME_WINDOW_SIZES_CHANGED(f) (f)->window_sizes_changed
 320 #define FRAME_MINIBUF_WINDOW(f) (f)->minibuffer_window
 321 #define FRAME_ROOT_WINDOW(f) (f)->root_window
 322 #define FRAME_SELECTED_WINDOW(f) (f)->selected_window
 323 #define SET_GLYPHS_FRAME(glyphs,frame) ((glyphs)->frame = (frame))
 324 #define FRAME_INSERT_COST(f) (f)->insert_line_cost
 325 #define FRAME_DELETE_COST(f) (f)->delete_line_cost
 326 #define FRAME_INSERTN_COST(f) (f)->insert_n_lines_cost
 327 #define FRAME_DELETEN_COST(f) (f)->delete_n_lines_cost
 328 #define FRAME_MESSAGE_BUF(f) (f)->message_buf
 329 #define FRAME_SCROLL_BOTTOM_VPOS(f) (f)->scroll_bottom_vpos
 330 #define FRAME_FOCUS_FRAME(f) (f)->focus_frame
 331 #define FRAME_CAN_HAVE_SCROLL_BARS(f) ((f)->can_have_scroll_bars)
 332 #define FRAME_HAS_VERTICAL_SCROLL_BARS(f) ((f)->has_vertical_scroll_bars)
 333 #define FRAME_SCROLL_BAR_PIXEL_WIDTH(f) ((f)->scroll_bar_pixel_width)
 334 #define FRAME_SCROLL_BAR_COLS(f) ((f)->scroll_bar_cols)
 335 #define FRAME_SCROLL_BARS(f) ((f)->scroll_bars)
 336 #define FRAME_CONDEMNED_SCROLL_BARS(f) ((f)->condemned_scroll_bars)
 337 #define FRAME_MENU_BAR_ITEMS(f) ((f)->menu_bar_items)
 338 #define FRAME_COST_BAUD_RATE(f) ((f)->cost_calculation_baud_rate)
 339
 340 /* Emacs's redisplay code could become confused if a frame's
 341    visibility changes at arbitrary times.  For example, if a frame is
 342    visible while the desired glyphs are being built, but becomes
 343    invisible before they are updated, then some rows of the
 344    desired_glyphs will be left marked as enabled after redisplay is
 345    complete, which should never happen.  The next time the frame
 346    becomes visible, redisplay will probably barf.
 347
 348    Currently, there are no similar situations involving iconified, but
 349    the principle is the same.
 350
 351    So instead of having asynchronous input handlers directly set and
 352    clear the frame's visibility and iconification flags, they just set
 353    the async_visible and async_iconified flags; the redisplay code
 354    calls the FRAME_SAMPLE_VISIBILITY macro before doing any redisplay,
 355    which sets visible and iconified from their asynchronous
 356    counterparts.
 357
 358    Synchronous code must use the FRAME_SET_VISIBLE macro.
 359
 360    Also, if a frame used to be invisible, but has just become visible,
 361    it must be marked as garbaged, since redisplay hasn't been keeping
 362    up its contents.  */
 363 #define FRAME_SAMPLE_VISIBILITY(f) \
 364   (((f)->async_visible && ! (f)->visible) ? SET_FRAME_GARBAGED (f) : 0, \
 365    (f)->visible = (f)->async_visible, \
 366    (f)->iconified = (f)->async_iconified)
 367
 368 #define CHECK_FRAME(x, i)                               \
 369   {                                                     \
 370     if (! FRAMEP (x))                                   \
 371       x = wrong_type_argument (Qframep, (x));           \
 372   }
 373
 374 #define CHECK_LIVE_FRAME(x, i)                          \
 375   {                                                     \
 376     if (! FRAMEP (x)                                    \
 377         || ! FRAME_LIVE_P (XFRAME (x)))         \
 378       x = wrong_type_argument (Qframe_live_p, (x));     \
 379   }
 380
 381 /* FOR_EACH_FRAME (LIST_VAR, FRAME_VAR) followed by a statement is a
 382    `for' loop which iterates over the elements of Vframe_list.  The
 383    loop will set FRAME_VAR, a Lisp_Object, to each frame in
 384    Vframe_list in succession and execute the statement.  LIST_VAR
 385    should be a Lisp_Object too; it is used to iterate through the
 386    Vframe_list.
 387
 388    If MULTI_FRAME isn't defined, then this loop expands to something which
 389    executes the statement once.  */
 390 #define FOR_EACH_FRAME(list_var, frame_var)                     \
 391   for ((list_var) = Vframe_list;                                \
 392        (CONSP (list_var)                                        \
 393         && (frame_var = XCONS (list_var)->car, 1));             \
 394        list_var = XCONS (list_var)->cdr)
 395
 396
 397 extern Lisp_Object Qframep, Qframe_live_p, Qicon;
 398
 399 extern struct frame *selected_frame;
 400 extern struct frame *last_nonminibuf_frame;
 401
 402 extern struct frame *make_terminal_frame ();
 403 extern struct frame *make_frame ();
 404 extern struct frame *make_minibuffer_frame ();
 405 extern struct frame *make_frame_without_minibuffer ();
 406
 407 extern Lisp_Object Vframe_list;
 408 extern Lisp_Object Vdefault_frame_alist;
 409
 410 extern Lisp_Object Vterminal_frame;
 411 \f
 412 #else /* not MULTI_FRAME */
 413
 414 /* These definitions are used in a single-frame version of Emacs.  */
 415
 416 /* A frame we use to store all the data concerning the screen when we
 417    don't have multiple frames.  Remember, if you store any data in it
 418    which needs to be protected from GC, you should staticpro that
 419    element explicitly.  */
 420 extern struct frame the_only_frame;
 421
 422 typedef struct frame *FRAME_PTR;
 423 #ifdef __GNUC__
 424 /* A function call for always getting 0 is overkill, so... */
 425 #define WINDOW_FRAME(w) ({ Lisp_Object tem; XSETFASTINT (tem, 0); tem; })
 426 #else
 427 #define WINDOW_FRAME(w) (Fselected_frame ())
 428 #endif
 429 #define XSETFRAME(p, v) (p = WINDOW_FRAME (***bogus***))
 430 #define XFRAME(frame) (&the_only_frame)
 431
 432 extern FRAME_PTR selected_frame;
 433 extern FRAME_PTR last_nonminibuf_frame;
 434
 435 #define FRAME_LIVE_P(f) 1
 436 #ifdef MSDOS
 437 /* The following definitions could also be used in the non-MSDOS case,
 438    but the constants below lead to better code.  */
 439 #define FRAME_TERMCAP_P(f) (the_only_frame.output_method == output_termcap)
 440 #define FRAME_X_P(f) (the_only_frame.output_method != output_termcap)
 441 #else
 442 #define FRAME_TERMCAP_P(f) 1
 443 #define FRAME_X_P(f) 0
 444 #endif
 445 #define FRAME_MINIBUF_ONLY_P(f) 0
 446 #define FRAME_HAS_MINIBUF_P(f) 1
 447 #define FRAME_CURRENT_GLYPHS(f) (the_only_frame.current_glyphs)
 448 #define FRAME_DESIRED_GLYPHS(f) (the_only_frame.desired_glyphs)
 449 #define FRAME_TEMP_GLYPHS(f) (the_only_frame.temp_glyphs)
 450 #define FRAME_HEIGHT(f) (the_only_frame.height)
 451 #define FRAME_WIDTH(f) (the_only_frame.width)
 452 #define FRAME_NEW_HEIGHT(f) (the_only_frame.new_height)
 453 #define FRAME_NEW_WIDTH(f) (the_only_frame.new_width)
 454 #define FRAME_MENU_BAR_LINES(f) (the_only_frame.menu_bar_lines)
 455 #define FRAME_CURSOR_X(f) (the_only_frame.cursor_x)
 456 #define FRAME_CURSOR_Y(f) (the_only_frame.cursor_y)
 457 #define FRAME_SET_VISIBLE(f,p) (p)
 458 #define FRAME_VISIBLE_P(f) 1
 459 #define SET_FRAME_GARBAGED(f) (frame_garbaged = 1)
 460 #define FRAME_GARBAGED_P(f) (frame_garbaged)
 461 #define FRAME_NO_SPLIT_P(f) 0
 462 #define FRAME_WANTS_MODELINE_P(f) 1
 463 #define FRAME_ICONIFIED_P(f) 0
 464 #define FRAME_WINDOW_SIZES_CHANGED(f) the_only_frame.window_sizes_changed
 465 #define FRAME_MINIBUF_WINDOW(f) (minibuf_window)
 466 #define FRAME_ROOT_WINDOW(f) (the_only_frame.root_window)
 467 #define FRAME_SELECTED_WINDOW(f) (selected_window)
 468 #define SET_GLYPHS_FRAME(glyphs,frame) do ; while (0)
 469 #define FRAME_INSERT_COST(frame)  (the_only_frame.insert_line_cost)
 470 #define FRAME_DELETE_COST(frame)  (the_only_frame.delete_line_cost)
 471 #define FRAME_INSERTN_COST(frame) (the_only_frame.insert_n_lines_cost)
 472 #define FRAME_DELETEN_COST(frame) (the_only_frame.delete_n_lines_cost)
 473 #define FRAME_MESSAGE_BUF(f) (the_only_frame.message_buf)
 474 #define FRAME_SCROLL_BOTTOM_VPOS(f) (the_only_frame.scroll_bottom_vpos)
 475 #define FRAME_FOCUS_FRAME(f) (Qnil)
 476 #define FRAME_CAN_HAVE_SCROLL_BARS(f) (the_only_frame.can_have_scroll_bars)
 477 #define FRAME_HAS_VERTICAL_SCROLL_BARS(f) \
 478   (the_only_frame.has_vertical_scroll_bars)
 479 #define FRAME_SCROLL_BAR_PIXEL_WIDTH(f) (the_only_frame.scroll_bar_pixel_width)
 480 #define FRAME_SCROLL_BAR_COLS(f) (the_only_frame.scroll_bar_cols)
 481 #define FRAME_SCROLL_BARS(f) (the_only_frame.scroll_bars)
 482 #define FRAME_CONDEMNED_SCROLL_BARS(f) (the_only_frame.condemned_scroll_bars)
 483 #define FRAME_MENU_BAR_ITEMS(f) (the_only_frame.menu_bar_items)
 484 #define FRAME_COST_BAUD_RATE(f) (the_only_frame.cost_calculation_baud_rate)
 485
 486 /* See comments in definition above.  */
 487 #define FRAME_SAMPLE_VISIBILITY(f) (0)
 488
 489 #define CHECK_FRAME(x, i) do; while (0)
 490 #define CHECK_LIVE_FRAME(x, y) do; while (0)
 491
 492 /* FOR_EACH_FRAME (LIST_VAR, FRAME_VAR) followed by a statement is a
 493    `for' loop which iterates over the elements of Vframe_list.  The
 494    loop will set FRAME_VAR, a Lisp_Object, to each frame in
 495    Vframe_list in succession and execute the statement.  LIST_VAR
 496    should be a Lisp_Object too; it is used to iterate through the
 497    Vframe_list.
 498
 499    If MULTI_FRAME _is_ defined, then this loop expands to a real
 500    `for' loop which traverses Vframe_list using LIST_VAR and
 501    FRAME_VAR.  */
 502 #define FOR_EACH_FRAME(list_var, frame_var)                     \
 503   for (list_var = Qt; frame_var = WINDOW_FRAME (***bogus***), ! NILP (list_var); list_var = Qnil)
 504
 505 #endif /* not MULTI_FRAME */
 506
 507 \f
 508 /* Device- and MULTI_FRAME-independent scroll bar stuff.  */
 509
 510 /* Return the starting column (zero-based) of the vertical scroll bar
 511    for window W.  The column before this one is the last column we can
 512    use for text.  If the window touches the right edge of the frame,
 513    we have extra space allocated for it.  Otherwise, the scroll bar
 514    takes over the window's rightmost columns.  */
 515 #define WINDOW_VERTICAL_SCROLL_BAR_COLUMN(w) \
 516   (((XINT ((w)->left) + XINT ((w)->width)) \
 517     < FRAME_WIDTH (XFRAME (WINDOW_FRAME (w)))) \
 518    ? (XINT ((w)->left) + XINT ((w)->width) \
 519       - FRAME_SCROLL_BAR_COLS (XFRAME (WINDOW_FRAME (w)))) \
 520    : FRAME_WIDTH (XFRAME (WINDOW_FRAME (w))))
 521
 522 /* Return the height in lines of the vertical scroll bar in w.  If the
 523    window has a mode line, don't make the scroll bar extend that far.  */
 524 #define WINDOW_VERTICAL_SCROLL_BAR_HEIGHT(w) (window_internal_height (w))