frame.c

/* Generic frame functions.
   Copyright (C) 1989, 1992 Free Software Foundation.

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include <stdio.h>

#include "config.h"
#include "lisp.h"
#include "frame.h"

#ifdef MULTI_FRAME

#include "window.h"
#include "termhooks.h"

Lisp_Object Vemacs_iconified;
Lisp_Object Vframe_list;
Lisp_Object Vterminal_frame;
Lisp_Object Vdefault_minibuffer_frame;
Lisp_Object Vdefault_frame_alist;

/* Evaluate this expression to rebuild the section of syms_of_frame
   that initializes and staticpros the symbols declared below.  Note
   that Emacs 18 has a bug that keeps C-x C-e from being able to
   evaluate this expression.

(progn
  ;; Accumulate a list of the symbols we want to initialize from the
  ;; declarations at the top of the file.
  (goto-char (point-min))
  (search-forward "/\*&&& symbols declared here &&&*\/\n")
  (let (symbol-list)
    (while (looking-at "Lisp_Object \\(Q[a-z_]+\\)")
      (setq symbol-list
	    (cons (buffer-substring (match-beginning 1) (match-end 1))
		  symbol-list))
      (forward-line 1))
    (setq symbol-list (nreverse symbol-list))
    ;; Delete the section of syms_of_... where we initialize the symbols.
    (search-forward "\n  /\*&&& init symbols here &&&*\/\n")
    (let ((start (point)))
      (while (looking-at "^  Q")
	(forward-line 2))
      (kill-region start (point)))
    ;; Write a new symbol initialization section.
    (while symbol-list
      (insert (format "  %s = intern (\"" (car symbol-list)))
      (let ((start (point)))
	(insert (substring (car symbol-list) 1))
	(subst-char-in-region start (point) ?_ ?-))
      (insert (format "\");\n  staticpro (&%s);\n" (car symbol-list)))
      (setq symbol-list (cdr symbol-list)))))
  */        

/*&&& symbols declared here &&&*/
Lisp_Object Qframep;
Lisp_Object Qlive_frame_p;
Lisp_Object Qheight;
Lisp_Object Qicon;
Lisp_Object Qminibuffer;
Lisp_Object Qmodeline;
Lisp_Object Qname;
Lisp_Object Qnone;
Lisp_Object Qonly;
Lisp_Object Qunsplittable;
Lisp_Object Qwidth;
Lisp_Object Qx;

extern Lisp_Object Vminibuffer_list;
extern Lisp_Object get_minibuffer ();

DEFUN ("framep", Fframep, Sframep, 1, 1, 0,
  "Return non-nil if OBJECT is a frame.\n\
Value is t for a termcap frame (a character-only terminal),\n\
`x' for an Emacs frame that is really an X window.\n\
Also see `live-frame-p'.")
  (object)
     Lisp_Object object;
{
  if (XTYPE (object) != Lisp_Frame)
    return Qnil;
  switch (XFRAME (object)->output_method)
    {
    case output_termcap:
      return Qt;
    case output_x_window:
      return Qx;
    default:
      abort ();
    }
}

DEFUN ("live-frame-p", Flive_frame_p, Slive_frame_p, 1, 1, 0,
  "Return non-nil if OBJECT is a frame which has not been deleted.\n\
Value is nil if OBJECT is not a live frame.  If object is a live\n\
frame, the return value indicates what sort of output device it is\n\
displayed on.  Value is t for a termcap frame (a character-only\n\
terminal), `x' for an Emacs frame being displayed in an X window.")
  (object)
     Lisp_Object object;
{
  return ((FRAMEP (object)
	   && FRAME_LIVE_P (XFRAME (object)))
	  ? Fframep (object)
	  : Qnil);
}

struct frame *
make_frame (mini_p)
     int mini_p;
{
  Lisp_Object frame;
  register struct frame *f;
  register Lisp_Object root_window;
  register Lisp_Object mini_window;

  frame = Fmake_vector (((sizeof (struct frame) - (sizeof (Lisp_Vector)
						     - sizeof (Lisp_Object)))
			  / sizeof (Lisp_Object)),
			 make_number (0));
  XSETTYPE (frame, Lisp_Frame);
  f = XFRAME (frame);

  f->cursor_x = 0;
  f->cursor_y = 0;
  f->current_glyphs = 0;
  f->desired_glyphs = 0;
  f->visible = 0;
  f->display.nothing = 0;
  f->iconified = 0;
  f->wants_modeline = 1;
  f->auto_raise = 0;
  f->auto_lower = 0;
  f->no_split = 0;
  f->garbaged = 0;
  f->has_minibuffer = mini_p;
  f->focus_frame = frame;

  f->param_alist = Qnil;

  root_window = make_window ();
  if (mini_p)
    {
      mini_window = make_window ();
      XWINDOW (root_window)->next = mini_window;
      XWINDOW (mini_window)->prev = root_window;
      XWINDOW (mini_window)->mini_p = Qt;
      XWINDOW (mini_window)->frame = frame;
      f->minibuffer_window = mini_window;
    }
  else
    {
      mini_window = Qnil;
      XWINDOW (root_window)->next = Qnil;
      f->minibuffer_window = Qnil;
    }

  XWINDOW (root_window)->frame = frame;

  /* 10 is arbitrary,
     just so that there is "something there."
     Correct size will be set up later with change_frame_size.  */

  f->width = 10;
  f->height = 10;

  XFASTINT (XWINDOW (root_window)->width) = 10;
  XFASTINT (XWINDOW (root_window)->height) = (mini_p ? 9 : 10);

  if (mini_p)
    {
      XFASTINT (XWINDOW (mini_window)->width) = 10;
      XFASTINT (XWINDOW (mini_window)->top) = 9;
      XFASTINT (XWINDOW (mini_window)->height) = 1;
    }

  /* Choose a buffer for the frame's root window.  */
  {
    Lisp_Object buf;

    XWINDOW (root_window)->buffer = Qt;
    buf = Fcurrent_buffer ();
    /* If buf is a 'hidden' buffer (i.e. one whose name starts with
       a space), try to find another one.  */
    if (XSTRING (Fbuffer_name (buf))->data[0] == ' ')
      buf = Fother_buffer (buf);
    Fset_window_buffer (root_window, buf);
  }

  if (mini_p)
    {
      XWINDOW (mini_window)->buffer = Qt;
      Fset_window_buffer (mini_window,
			  (NILP (Vminibuffer_list)
			   ? get_minibuffer (0)
			   : Fcar (Vminibuffer_list)));
    }

  f->root_window = root_window;
  f->selected_window = root_window;
  /* Make sure this window seems more recently used than
     a newly-created, never-selected window.  */
  XFASTINT (XWINDOW (f->selected_window)->use_time) = ++window_select_count;

  Vframe_list = Fcons (frame, Vframe_list);

  return f;
}

/* Make a frame using a separate minibuffer window on another frame.
   MINI_WINDOW is the minibuffer window to use.  nil means use the
   default (the global minibuffer).  */

struct frame *
make_frame_without_minibuffer (mini_window)
     register Lisp_Object mini_window;
{
  register struct frame *f;

  /* Choose the minibuffer window to use.  */
  if (NILP (mini_window))
    {
      if (XTYPE (Vdefault_minibuffer_frame) != Lisp_Frame)
	error ("default-minibuffer-frame must be set when creating minibufferless frames");
      if (! FRAME_LIVE_P (XFRAME (Vdefault_minibuffer_frame)))
	error ("default-minibuffer-frame must be a live frame");
      mini_window = XFRAME (Vdefault_minibuffer_frame)->minibuffer_window;
    }
  else
    {
      CHECK_WINDOW (mini_window, 0);
    }

  /* Make a frame containing just a root window.  */
  f = make_frame (0);

  /* Install the chosen minibuffer window, with proper buffer.  */
  f->minibuffer_window = mini_window;
  Fset_window_buffer (mini_window,
		      (NILP (Vminibuffer_list)
		       ? get_minibuffer (0)
		       : Fcar (Vminibuffer_list)));
  return f;
}

/* Make a frame containing only a minibuffer window.  */

struct frame *
make_minibuffer_frame ()
{
  /* First make a frame containing just a root window, no minibuffer.  */

  register struct frame *f = make_frame (0);
  register Lisp_Object mini_window;
  register Lisp_Object frame;

  XSET (frame, Lisp_Frame, f);

  /* ??? Perhaps leave it to the user program to set auto_raise.  */
  f->auto_raise = 1;
  f->auto_lower = 0;
  f->no_split = 1;
  f->wants_modeline = 0;
  f->has_minibuffer = 1;

  /* Now label the root window as also being the minibuffer.
     Avoid infinite looping on the window chain by marking next pointer
     as nil. */

  mini_window = f->minibuffer_window = f->root_window;
  XWINDOW (mini_window)->mini_p = Qt;
  XWINDOW (mini_window)->next = Qnil;
  XWINDOW (mini_window)->prev = mini_window;
  XWINDOW (mini_window)->frame = frame;

  /* Put the proper buffer in that window.  */

  Fset_window_buffer (mini_window,
		      (NILP (Vminibuffer_list)
		       ? get_minibuffer (0)
		       : Fcar (Vminibuffer_list)));
  return f;
}

/* Construct a frame that refers to the terminal (stdin and stdout).  */

struct frame *
make_terminal_frame ()
{
  register struct frame *f;

  Vframe_list = Qnil;
  f = make_frame (1);
  f->name = build_string ("terminal");
  f->visible = 1;
  f->display.nothing = 1;   /* Nonzero means frame isn't deleted.  */
  XSET (Vterminal_frame, Lisp_Frame, f);
  return f;
}

DEFUN ("select-frame", Fselect_frame, Sselect_frame, 1, 2, 0,
  "Select the frame FRAME.  FRAMES's selected window becomes \"the\"\n\
selected window.  If the optional parameter NO-ENTER is non-nil, don't\n\
focus on that frame.")
  (frame, no_enter)
     Lisp_Object frame, no_enter;
{
  CHECK_LIVE_FRAME (frame, 0);

  if (selected_frame == XFRAME (frame))
    return frame;

  selected_frame = XFRAME (frame);
  if (! FRAME_MINIBUF_ONLY_P (selected_frame))
    last_nonminibuf_frame = selected_frame;

  Fselect_window (XFRAME (frame)->selected_window);

#ifdef HAVE_X_WINDOWS
#ifdef MULTI_FRAME
  if (FRAME_X_P (XFRAME (frame))
      && NILP (no_enter))
    {
      Ffocus_frame (frame);
    }
#endif
#endif
  choose_minibuf_frame ();

  return frame;
}

DEFUN ("selected-frame", Fselected_frame, Sselected_frame, 0, 0, 0,
  "Return the frame that is now selected.")
  ()
{
  Lisp_Object tem;
  XSET (tem, Lisp_Frame, selected_frame);
  return tem;
}

DEFUN ("window-frame", Fwindow_frame, Swindow_frame, 1, 1, 0,
  "Return the frame object that window WINDOW is on.")
  (window)
     Lisp_Object window;
{
  CHECK_WINDOW (window, 0);
  return XWINDOW (window)->frame;
}

DEFUN ("frame-root-window", Fframe_root_window, Sframe_root_window, 0, 1, 0,
       "Returns the root-window of FRAME.")
  (frame)
     Lisp_Object frame;
{
  if (NILP (frame))
    XSET (frame, Lisp_Frame, selected_frame);
  else
    CHECK_LIVE_FRAME (frame, 0);

  return XFRAME (frame)->root_window;
}

DEFUN ("frame-selected-window", Fframe_selected_window,
       Sframe_selected_window, 0, 1, 0,
  "Return the selected window of frame object FRAME.")
  (frame)
     Lisp_Object frame;
{
  if (NILP (frame))
    XSET (frame, Lisp_Frame, selected_frame);
  else
    CHECK_LIVE_FRAME (frame, 0);

  return XFRAME (frame)->selected_window;
}

DEFUN ("frame-list", Fframe_list, Sframe_list,
       0, 0, 0,
       "Return a list of all frames.")
  ()
{
  return Fcopy_sequence (Vframe_list);
}

#ifdef MULTI_FRAME

/* Return the next frame in the frame list after FRAME.
   If MINIBUF is non-nil, include all frames.
   If MINIBUF is nil, exclude minibuffer-only frames.
   If MINIBUF is a window, include only frames using that window for
   their minibuffer.  */
Lisp_Object
next_frame (frame, minibuf)
     Lisp_Object frame;
     Lisp_Object minibuf;
{
  Lisp_Object tail;
  int passed = 0;

  /* There must always be at least one frame in Vframe_list.  */
  if (! CONSP (Vframe_list))
    abort ();

  while (1)
    for (tail = Vframe_list; CONSP (tail); tail = XCONS (tail)->cdr)
      {
	if (passed)
	  {
	    Lisp_Object f = XCONS (tail)->car;

	    /* Decide whether this frame is eligible to be returned,
	       according to minibuf.  */
	    if ((NILP (minibuf) && ! FRAME_MINIBUF_ONLY_P (XFRAME (f)))
		|| XTYPE (minibuf) != Lisp_Window
		|| EQ (FRAME_MINIBUF_WINDOW (XFRAME (f)), minibuf)
		|| EQ (f, frame))
	      return f;
	  }

	if (EQ (frame, XCONS (tail)->car))
	  passed++;
      }
}

/* Return the previous frame in the frame list before FRAME.
   If MINIBUF is non-nil, include all frames.
   If MINIBUF is nil, exclude minibuffer-only frames.
   If MINIBUF is a window, include only frames using that window for
   their minibuffer.  */
Lisp_Object
prev_frame (frame, minibuf)
     Lisp_Object frame;
     Lisp_Object minibuf;
{
  Lisp_Object tail;
  Lisp_Object prev;

  /* There must always be at least one frame in Vframe_list.  */
  if (! CONSP (Vframe_list))
    abort ();

  prev = Qnil;
  while (1)
    {
      for (tail = Vframe_list; CONSP (tail); tail = XCONS (tail)->cdr)
	{
	  Lisp_Object scr = XCONS (tail)->car;

	  if (XTYPE (scr) != Lisp_Frame)
	    abort ();

	  if (EQ (frame, scr) && !NILP (prev))
	    return prev;

	  /* Decide whether this frame is eligible to be returned,
	     according to minibuf.  */
	  if ((NILP (minibuf) && ! FRAME_MINIBUF_ONLY_P (XFRAME (scr)))
	      || XTYPE (minibuf) != Lisp_Window
	      || EQ (FRAME_MINIBUF_WINDOW (XFRAME (scr)), minibuf))
	    prev = scr;
	}

      if (NILP (prev))
	/* We went through the whole frame list without finding a single
	   acceptable frame.  Return the original frame.  */
	prev = frame;
    }
	  
}

DEFUN ("next-frame", Fnext_frame, Snext_frame, 0, 2, 0,
  "Return the next frame in the frame list after FRAME.\n\
If optional argument MINIBUF is non-nil, include all frames.  If\n\
MINIBUF is nil or omitted, exclude minibuffer-only frames.  If\n\
MINIBUF is a window, include only frames using that window for their\n\
minibuffer.")
  (frame, miniframe)
Lisp_Object frame, miniframe;
{
  Lisp_Object tail;

  if (NILP (frame))
    XSET (frame, Lisp_Frame, selected_frame);
  else
    CHECK_LIVE_FRAME (frame, 0);

  return next_frame (frame, miniframe);
}
#endif /* MULTI_FRAME */

DEFUN ("delete-frame", Fdelete_frame, Sdelete_frame, 0, 1, "",
  "Delete FRAME, permanently eliminating it from use.\n\
If omitted, FRAME defaults to the selected frame.\n\
A frame may not be deleted if its minibuffer is used by other frames.")
  (frame)
     Lisp_Object frame;
{
  struct frame *f;
  union display displ;

  if (EQ (frame, Qnil))
    {
      f = selected_frame;
      XSET (frame, Lisp_Frame, f);
    }
  else
    {
      CHECK_FRAME (frame, 0);
      f = XFRAME (frame);
    }

  if (! FRAME_LIVE_P (f))
    return;

  /* Are there any other frames besides this one?  */
  if (f == selected_frame && EQ (next_frame (frame, Qt), frame))
    error ("Attempt to delete the only frame");

  /* Does this frame have a minibuffer, and is it the surrogate
     minibuffer for any other frame?  */
  if (FRAME_HAS_MINIBUF_P (XFRAME (frame)))
    {
      Lisp_Object frames;

      for (frames = Vframe_list;
	   CONSP (frames);
	   frames = XCONS (frames)->cdr)
	{
	  Lisp_Object this = XCONS (frames)->car;

	  if (! EQ (this, frame)
	      && EQ (frame,
		     (WINDOW_FRAME
		      (XWINDOW
		       (FRAME_MINIBUF_WINDOW
			(XFRAME (this)))))))
	    error ("Attempt to delete a surrogate minibuffer frame");
	}
    }

  /* Don't let the frame remain selected.  */
  if (f == selected_frame)
    Fselect_frame (next_frame (frame, Qt));

  /* Don't allow minibuf_window to remain on a deleted frame.  */
  if (EQ (f->minibuffer_window, minibuf_window))
    {
      Fset_window_buffer (selected_frame->minibuffer_window,
			  XWINDOW (minibuf_window)->buffer);
      minibuf_window = selected_frame->minibuffer_window;
    }

  Vframe_list = Fdelq (frame, Vframe_list);
  f->visible = 0;
  displ = f->display;
  f->display.nothing = 0;

#ifdef HAVE_X_WINDOWS
  if (FRAME_X_P (f))
    x_destroy_window (f, displ);
#endif

  /* If we've deleted the last_nonminibuf_frame, then try to find
     another one.  */
  if (f == last_nonminibuf_frame)
    {
      Lisp_Object frames;

      last_nonminibuf_frame = 0;

      for (frames = Vframe_list;
	   CONSP (frames);
	   frames = XCONS (frames)->cdr)
	{
	  f = XFRAME (XCONS (frames)->car);
	  if (!FRAME_MINIBUF_ONLY_P (f))
	    {
	      last_nonminibuf_frame = f;
	      break;
	    }
	}
    }

  /* If we've deleted Vdefault_minibuffer_frame, try to find another
     one.  Prefer minibuffer-only frames, but also notice frames
     with other windows.  */
  if (EQ (frame, Vdefault_minibuffer_frame))
    {
      Lisp_Object frames;

      /* The last frame we saw with a minibuffer, minibuffer-only or not.  */
      Lisp_Object frame_with_minibuf = Qnil;

      for (frames = Vframe_list;
	   CONSP (frames);
	   frames = XCONS (frames)->cdr)
	{
	  Lisp_Object this = XCONS (frames)->car;

	  if (XTYPE (this) != Lisp_Frame)
	    abort ();
	  f = XFRAME (this);

	  if (FRAME_HAS_MINIBUF_P (f))
	    {
	      frame_with_minibuf = this;
	      if (FRAME_MINIBUF_ONLY_P (f))
		break;
	    }
	}

      /* We know that there must be some frame with a minibuffer out
	 there.  If this were not true, all of the frames present
	 would have to be minibufferless, which implies that at some
	 point their minibuffer frames must have been deleted, but
	 that is prohibited at the top; you can't delete surrogate
	 minibuffer frames.  */
      if (NILP (frame_with_minibuf))
	abort ();

      Vdefault_minibuffer_frame = frame_with_minibuf;
    }

  return Qnil;
}

/* Return mouse position in character cell units.  */

DEFUN ("mouse-position", Fmouse_position, Smouse_position, 0, 0, 0,
  "Return a list (FRAME X . Y) giving the current mouse frame and position.\n\
If Emacs is running on a mouseless terminal or hasn't been programmed\n\
to read the mouse position, it returns the selected frame for FRAME\n\
and nil for X and Y.")
  ()
{
  Lisp_Object x, y, dummy;
  FRAME_PTR f;

  if (mouse_position_hook)
    (*mouse_position_hook) (&f, &x, &y, &dummy);
  else
    {
      f = selected_frame;
      x = y = Qnil;
    }

  XSET (dummy, Lisp_Frame, f);
  return Fcons (dummy, Fcons (make_number (x), make_number (y)));
}

DEFUN ("set-mouse-position", Fset_mouse_position, Sset_mouse_position, 3, 3, 0,
  "Move the mouse pointer to the center of cell (X,Y) in FRAME.\n\
WARNING:  If you use this under X, you should do `unfocus-frame' afterwards.")
  (frame, x, y)
     Lisp_Object frame, x, y;
{
  CHECK_LIVE_FRAME (frame, 0);
  CHECK_NUMBER (x, 2);
  CHECK_NUMBER (y, 1);

#ifdef HAVE_X_WINDOWS
  if (FRAME_X_P (XFRAME (frame)))
    /* Warping the mouse will cause  enternotify and focus events. */
    x_set_mouse_position (XFRAME (frame), x, y);
#endif

  return Qnil;
}

#if 0
/* ??? Can this be replaced with a Lisp function?
   It is used in minibuf.c.  Can we get rid of that?
   Yes.  All uses in minibuf.c are gone, and parallels to these
   functions have been defined in frame.el.  */

DEFUN ("frame-configuration", Fframe_configuration, Sframe_configuration,
       0, 0, 0,
  "Return object describing current frame configuration.\n\
The frame configuration is the current mouse position and selected frame.\n\
This object can be given to `restore-frame-configuration'\n\
to restore this frame configuration.")
  ()
{
  Lisp_Object c, time;
  
  c = Fmake_vector (make_number(4), Qnil);
  XVECTOR (c)->contents[0] = Fselected_frame();
  if (mouse_position_hook)
    (*mouse_position_hook) (&XVECTOR (c)->contents[1]
			    &XVECTOR (c)->contents[2],
			    &XVECTOR (c)->contents[3],
			    &time);
  return c;
}

DEFUN ("restore-frame-configuration", Frestore_frame_configuration,
       Srestore_frame_configuration,
       1, 1, 0,
  "Restores frame configuration CONFIGURATION.")
  (config)
  Lisp_Object config;
{
  Lisp_Object x_pos, y_pos, frame;

  CHECK_VECTOR (config, 0);
  if (XVECTOR (config)->size != 3)
    {
      error ("Wrong size vector passed to restore-frame-configuration");
    }
  frame = XVECTOR (config)->contents[0];
  CHECK_LIVE_FRAME (frame, 0);

  Fselect_frame (frame, Qnil);

#if 0
  /* This seems to interfere with the frame selection mechanism. jla */
  x_pos = XVECTOR (config)->contents[2];
  y_pos = XVECTOR (config)->contents[3];
  set_mouse_position (frame, XINT (x_pos), XINT (y_pos));
#endif

  return frame;
}    
#endif

DEFUN ("make-frame-visible", Fmake_frame_visible, Smake_frame_visible,
       0, 1, 0,
  "Make the frame FRAME visible (assuming it is an X-window).\n\
Also raises the frame so that nothing obscures it.")
  (frame)
     Lisp_Object frame;
{
  if (NILP (frame))
    XSET (frame, Lisp_Frame, selected_frame);

  CHECK_LIVE_FRAME (frame, 0);

#ifdef HAVE_X_WINDOWS
  if (FRAME_X_P (XFRAME (frame)))
    x_make_frame_visible (XFRAME (frame));
#endif

  return frame;
}

DEFUN ("make-frame-invisible", Fmake_frame_invisible, Smake_frame_invisible,
       0, 1, "",
  "Make the frame FRAME invisible (assuming it is an X-window).")
  (frame)
     Lisp_Object frame;
{
  if (NILP (frame))
    XSET (frame, Lisp_Frame, selected_frame);

  CHECK_LIVE_FRAME (frame, 0);

#ifdef HAVE_X_WINDOWS
  if (FRAME_X_P (XFRAME (frame)))
    x_make_frame_invisible (XFRAME (frame));
#endif

  return Qnil;
}

DEFUN ("iconify-frame", Ficonify_frame, Siconify_frame,
       0, 1, "",
  "Make the frame FRAME into an icon.")
  (frame)
     Lisp_Object frame;
{
  if (NILP (frame))
    XSET (frame, Lisp_Frame, selected_frame);
  
  CHECK_LIVE_FRAME (frame, 0);

#ifdef HAVE_X_WINDOWS
  if (FRAME_X_P (XFRAME (frame)))
      x_iconify_frame (XFRAME (frame));
#endif

  return Qnil;
}

DEFUN ("frame-visible-p", Fframe_visible_p, Sframe_visible_p,
       1, 1, 0,
       "Return t if FRAME is now \"visible\" (actually in use for display).\n\
A frame that is not \"visible\" is not updated and, if it works through\n\
a window system, it may not show at all.\n\
Return the symbol `icon' if frame is visible only as an icon.")
  (frame)
     Lisp_Object frame;
{
  CHECK_LIVE_FRAME (frame, 0);

  if (XFRAME (frame)->visible)
    return Qt;
  if (XFRAME (frame)->iconified)
    return Qicon;
  return Qnil;
}

DEFUN ("visible-frame-list", Fvisible_frame_list, Svisible_frame_list,
       0, 0, 0,
       "Return a list of all frames now \"visible\" (being updated).")
  ()
{
  Lisp_Object tail, frame;
  struct frame *f;
  Lisp_Object value;

  value = Qnil;
  for (tail = Vframe_list; CONSP (tail); tail = XCONS (tail)->cdr)
    {
      frame = XCONS (tail)->car;
      if (XTYPE (frame) != Lisp_Frame)
	continue;
      f = XFRAME (frame);
      if (f->visible)
	value = Fcons (frame, value);
    }
  return value;
}



DEFUN ("redirect-frame-focus", Fredirect_frame_focus, Sredirect_frame_focus,
       1, 2, 0,
  "Arrange for keystrokes typed at FRAME to be sent to FOCUS-FRAME.\n\
This means that, after reading a keystroke typed at FRAME,\n\
`last-event-frame' will be FOCUS-FRAME.\n\
\n\
If FOCUS-FRAME is omitted or eq to FRAME, any existing redirection is\n\
cancelled, and the frame again receives its own keystrokes.\n\
\n\
The redirection lasts until the next call to `redirect-frame-focus'\n\
or `select-frame'.\n\
\n\
This is useful for temporarily redirecting keystrokes to the minibuffer\n\
window when a frame doesn't have its own minibuffer.")
  (frame, focus_frame)
    Lisp_Object frame, focus_frame;
{
  CHECK_LIVE_FRAME (frame, 0);

  if (NILP (focus_frame))
    focus_frame = frame;
  else