frame.c 32 KB
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/* Generic frame functions.
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   Copyright (C) 1989, 1992 Free Software Foundation.
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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
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the Free Software Foundation; either version 2, or (at your option)
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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.  */

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#include <stdio.h>

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#include "config.h"
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#ifdef MULTI_FRAME
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#include "lisp.h"
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#include "frame.h"
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#include "window.h"
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#include "termhooks.h"
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Lisp_Object Vemacs_iconified;
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Lisp_Object Qframep;
Lisp_Object Qlive_frame_p;
Lisp_Object Vframe_list;
Lisp_Object Vterminal_frame;
Lisp_Object Vdefault_minibuffer_frame;
Lisp_Object Vdefault_frame_alist;
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Lisp_Object Qminibuffer;
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extern Lisp_Object Vminibuffer_list;
extern Lisp_Object get_minibuffer ();

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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'.")
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  (object)
     Lisp_Object object;
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{
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  if (XTYPE (object) != Lisp_Frame)
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    return Qnil;
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  switch (XFRAME (object)->output_method)
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    {
    case output_termcap:
      return Qt;
    case output_x_window:
      return intern ("x");
    default:
      abort ();
    }
}

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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.")
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  (object)
     Lisp_Object object;
{
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  return ((FRAMEP (object)
	   && FRAME_LIVE_P (XFRAME (object)))
	  ? Fframep (object)
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	  : Qnil);
}

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

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  frame = Fmake_vector (((sizeof (struct frame) - (sizeof (Lisp_Vector)
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						     - sizeof (Lisp_Object)))
			  / sizeof (Lisp_Object)),
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			 make_number (0));
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  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;
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  root_window = make_window (0);
  if (mini_p)
    {
      mini_window = make_window (0);
      XWINDOW (root_window)->next = mini_window;
      XWINDOW (mini_window)->prev = root_window;
      XWINDOW (mini_window)->mini_p = Qt;
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      XWINDOW (mini_window)->frame = frame;
      f->minibuffer_window = mini_window;
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    }
  else
    {
      mini_window = Qnil;
      XWINDOW (root_window)->next = Qnil;
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      f->minibuffer_window = Qnil;
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    }

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  XWINDOW (root_window)->frame = frame;
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  /* 10 is arbitrary,
     just so that there is "something there."
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     Correct size will be set up later with change_frame_size.  */
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  f->width = 10;
  f->height = 10;
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  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;
    }

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  /* Choose a buffer for the frame's root window.  */
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  {
    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);
  }

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

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  f->root_window = root_window;
  f->selected_window = root_window;
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  /* Make sure this window seems more recently used than
     a newly-created, never-selected window.  */
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  XFASTINT (XWINDOW (f->selected_window)->use_time) = ++window_select_count;
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  Vframe_list = Fcons (frame, Vframe_list);
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  return f;
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}

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/* Make a frame using a separate minibuffer window on another frame.
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   MINI_WINDOW is the minibuffer window to use.  nil means use the
   default (the global minibuffer).  */

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struct frame *
make_frame_without_minibuffer (mini_window)
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     register Lisp_Object mini_window;
{
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  register struct frame *f;
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  /* Choose the minibuffer window to use.  */
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  if (NILP (mini_window))
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    {
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      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;
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    }
  else
    {
      CHECK_WINDOW (mini_window, 0);
    }

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

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/* Make a frame containing only a minibuffer window.  */
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struct frame *
make_minibuffer_frame ()
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{
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  /* First make a frame containing just a root window, no minibuffer.  */
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  register struct frame *f = make_frame (0);
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  register Lisp_Object mini_window;
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  register Lisp_Object frame;
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  XSET (frame, Lisp_Frame, f);
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  /* ??? Perhaps leave it to the user program to set auto_raise.  */
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  f->auto_raise = 1;
  f->auto_lower = 0;
  f->no_split = 1;
  f->wants_modeline = 0;
  f->has_minibuffer = 1;
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  /* Now label the root window as also being the minibuffer.
     Avoid infinite looping on the window chain by marking next pointer
     as nil. */

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  mini_window = f->minibuffer_window = f->root_window;
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  XWINDOW (mini_window)->mini_p = Qt;
  XWINDOW (mini_window)->next = Qnil;
  XWINDOW (mini_window)->prev = mini_window;
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  XWINDOW (mini_window)->frame = frame;
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  /* Put the proper buffer in that window.  */

  Fset_window_buffer (mini_window,
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		      (NILP (Vminibuffer_list)
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		       ? get_minibuffer (0)
		       : Fcar (Vminibuffer_list)));
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  return f;
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}

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/* Construct a frame that refers to the terminal (stdin and stdout).  */
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struct frame *
make_terminal_frame ()
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{
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  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;
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}

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DEFUN ("select-frame", Fselect_frame, Sselect_frame, 1, 2, 0,
  "Select the frame FRAME.  FRAMES's selected window becomes \"the\"\n\
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selected window.  If the optional parameter NO-ENTER is non-nil, don't\n\
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focus on that frame.")
  (frame, no_enter)
     Lisp_Object frame, no_enter;
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{
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  CHECK_LIVE_FRAME (frame, 0);
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  if (selected_frame == XFRAME (frame))
    return frame;
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  selected_frame = XFRAME (frame);
  if (! FRAME_MINIBUF_ONLY_P (selected_frame))
    last_nonminibuf_frame = selected_frame;
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  Fselect_window (XFRAME (frame)->selected_window);
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#ifdef HAVE_X_WINDOWS
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#ifdef MULTI_FRAME
  if (FRAME_IS_X (XFRAME (frame))
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      && NILP (no_enter))
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    {
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      Ffocus_frame (frame);
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    }
#endif
#endif
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  choose_minibuf_frame ();
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  return frame;
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}

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

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

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

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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;
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{
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  if (NILP (frame))
    XSET (frame, Lisp_Frame, selected_frame);
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  else
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    CHECK_LIVE_FRAME (frame, 0);
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  return XFRAME (frame)->selected_window;
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}

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

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#ifdef MULTI_FRAME
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/* 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
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   their minibuffer.  */
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Lisp_Object
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next_frame (frame, minibuf)
     Lisp_Object frame;
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     Lisp_Object minibuf;
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{
  Lisp_Object tail;
  int passed = 0;

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

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  while (1)
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    for (tail = Vframe_list; CONSP (tail); tail = XCONS (tail)->cdr)
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      {
	if (passed)
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	  {
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	    Lisp_Object f = XCONS (tail)->car;
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	    /* Decide whether this frame is eligible to be returned,
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	       according to minibuf.  */
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	    if ((NILP (minibuf) && ! FRAME_MINIBUF_ONLY_P (XFRAME (f)))
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		|| XTYPE (minibuf) != Lisp_Window
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		|| EQ (FRAME_MINIBUF_WINDOW (XFRAME (f)), minibuf)
		|| EQ (f, frame))
	      return f;
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	  }
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	if (EQ (frame, XCONS (tail)->car))
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	  passed++;
      }
}

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/* 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
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   their minibuffer.  */
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Lisp_Object
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prev_frame (frame, minibuf)
     Lisp_Object frame;
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     Lisp_Object minibuf;
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{
  Lisp_Object tail;
  Lisp_Object prev;

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

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

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

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

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

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

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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\
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minibuffer.")
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  (frame, miniframe)
Lisp_Object frame, miniframe;
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{
  Lisp_Object tail;

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  if (NILP (frame))
    XSET (frame, Lisp_Frame, selected_frame);
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  else
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    CHECK_LIVE_FRAME (frame, 0);
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  return next_frame (frame, miniframe);
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}
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#endif /* MULTI_FRAME */
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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;
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{
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  struct frame *f;
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  union display displ;

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

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  if (! FRAME_LIVE_P (f))
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    return;

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  /* 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");
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  /* Does this frame have a minibuffer, and is it the surrogate
     minibuffer for any other frame?  */
  if (FRAME_HAS_MINIBUF (XFRAME (frame)))
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    {
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      Lisp_Object frames;
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      for (frames = Vframe_list;
	   CONSP (frames);
	   frames = XCONS (frames)->cdr)
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	{
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	  Lisp_Object this = XCONS (frames)->car;
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	  if (! EQ (this, frame)
	      && EQ (frame,
		     (WINDOW_FRAME
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		      (XWINDOW
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		       (FRAME_MINIBUF_WINDOW
			(XFRAME (this)))))))
	    error ("Attempt to delete a surrogate minibuffer frame");
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	}
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    }

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

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  Vframe_list = Fdelq (frame, Vframe_list);
  f->visible = 0;
  displ = f->display;
  f->display.nothing = 0;
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#ifdef HAVE_X_WINDOWS
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  if (FRAME_IS_X (f))
    x_destroy_window (f, displ);
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#endif

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  /* If we've deleted the last_nonminibuf_frame, then try to find
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     another one.  */
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  if (f == last_nonminibuf_frame)
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    {
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      Lisp_Object frames;
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      last_nonminibuf_frame = 0;
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      for (frames = Vframe_list;
	   CONSP (frames);
	   frames = XCONS (frames)->cdr)
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	{
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	  f = XFRAME (XCONS (frames)->car);
	  if (!FRAME_MINIBUF_ONLY_P (f))
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	    {
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	      last_nonminibuf_frame = f;
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	      break;
	    }
	}
    }
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  /* If we've deleted Vdefault_minibuffer_frame, try to find another
     one.  Prefer minibuffer-only frames, but also notice frames
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     with other windows.  */
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  if (EQ (frame, Vdefault_minibuffer_frame))
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    {
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      Lisp_Object frames;
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      /* The last frame we saw with a minibuffer, minibuffer-only or not.  */
      Lisp_Object frame_with_minibuf = Qnil;
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      for (frames = Vframe_list;
	   CONSP (frames);
	   frames = XCONS (frames)->cdr)
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	{
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	  Lisp_Object this = XCONS (frames)->car;
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	  if (XTYPE (this) != Lisp_Frame)
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	    abort ();
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	  f = XFRAME (this);
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	  if (FRAME_HAS_MINIBUF (f))
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	    {
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	      frame_with_minibuf = this;
	      if (FRAME_MINIBUF_ONLY_P (f))
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		break;
	    }
	}

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

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      Vdefault_minibuffer_frame = frame_with_minibuf;
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    }

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

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DEFUN ("mouse-position", Fmouse_position, Smouse_position, 0, 0, 0,
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  "Return a list (FRAME X . Y) giving the current mouse frame and position.\n\
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If Emacs is running on a mouseless terminal or hasn't been programmed\n\
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to read the mouse position, it returns the selected frame for FRAME\n\
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and nil for X and Y.")
  ()
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{
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  Lisp_Object x, y, dummy;
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  FRAME_PTR f;
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  if (mouse_position_hook)
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    (*mouse_position_hook) (&f, &x, &y, &dummy);
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  else
    {
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      f = selected_frame;
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      x = y = Qnil;
    }
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  XSET (dummy, Lisp_Frame, f);
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  return Fcons (dummy, Fcons (make_number (x), make_number (y)));
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}

DEFUN ("set-mouse-position", Fset_mouse_position, Sset_mouse_position, 3, 3, 0,
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  "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;
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{
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  CHECK_LIVE_FRAME (frame, 0);
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  CHECK_NUMBER (x, 2);
  CHECK_NUMBER (y, 1);

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

  return Qnil;
}

#if 0
/* ??? Can this be replaced with a Lisp function?
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   It is used in minibuf.c.  Can we get rid of that?
   Yes.  All uses in minibuf.c are gone, and parallels to these
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   functions have been defined in frame.el.  */
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DEFUN ("frame-configuration", Fframe_configuration, Sframe_configuration,
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       0, 0, 0,
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  "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.")
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  ()
{
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  Lisp_Object c, time;
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  c = Fmake_vector (make_number(4), Qnil);
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  XVECTOR (c)->contents[0] = Fselected_frame();
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  if (mouse_position_hook)
    (*mouse_position_hook) (&XVECTOR (c)->contents[1]
			    &XVECTOR (c)->contents[2],
			    &XVECTOR (c)->contents[3],
			    &time);
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  return c;
}

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DEFUN ("restore-frame-configuration", Frestore_frame_configuration,
       Srestore_frame_configuration,
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       1, 1, 0,
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  "Restores frame configuration CONFIGURATION.")
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  (config)
  Lisp_Object config;
{
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  Lisp_Object x_pos, y_pos, frame;
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  CHECK_VECTOR (config, 0);
  if (XVECTOR (config)->size != 3)
    {
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      error ("Wrong size vector passed to restore-frame-configuration");
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    }
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  frame = XVECTOR (config)->contents[0];
  CHECK_LIVE_FRAME (frame, 0);
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  Fselect_frame (frame, Qnil);
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#if 0
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  /* This seems to interfere with the frame selection mechanism. jla */
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  x_pos = XVECTOR (config)->contents[2];
  y_pos = XVECTOR (config)->contents[3];
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  set_mouse_position (frame, XINT (x_pos), XINT (y_pos));
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#endif

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  return frame;
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}    
#endif

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DEFUN ("make-frame-visible", Fmake_frame_visible, Smake_frame_visible,
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       1, 1, 0,
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  "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;
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{
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  CHECK_LIVE_FRAME (frame, 0);
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  if (FRAME_IS_X (XFRAME (frame)))
    x_make_frame_visible (XFRAME (frame));
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  return frame;
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}

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DEFUN ("make-frame-invisible", Fmake_frame_invisible, Smake_frame_invisible,
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       1, 1, 0,
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  "Make the frame FRAME invisible (assuming it is an X-window).")
  (frame)
     Lisp_Object frame;
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{
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  CHECK_LIVE_FRAME (frame, 0);
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  if (FRAME_IS_X (XFRAME (frame)))
    x_make_frame_invisible (XFRAME (frame));
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  return Qnil;
}

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DEFUN ("iconify-frame", Ficonify_frame, Siconify_frame,
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       1, 1, 0,
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  "Make the frame FRAME into an icon.")
  (frame)
     Lisp_Object frame;
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{
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  CHECK_LIVE_FRAME (frame, 0);
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  if (FRAME_IS_X (XFRAME (frame)))
      x_iconify_frame (XFRAME (frame));
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  return Qnil;
}

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DEFUN ("frame-visible-p", Fframe_visible_p, Sframe_visible_p,
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       1, 1, 0,
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       "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\
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a window system, it may not show at all.\n\
Return the symbol `icon' if window is visible only as an icon.")
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  (frame)
     Lisp_Object frame;
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{
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  CHECK_LIVE_FRAME (frame, 0);
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  if (XFRAME (frame)->visible)
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    return Qt;
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  if (XFRAME (frame)->iconified)
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    return intern ("icon");
  return Qnil;
}

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

  value = Qnil;
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  for (tail = Vframe_list; CONSP (tail); tail = XCONS (tail)->cdr)
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    {
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      frame = XCONS (tail)->car;
      if (XTYPE (frame) != Lisp_Frame)
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	continue;
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      f = XFRAME (frame);
      if (f->visible)
	value = Fcons (frame, value);
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    }
  return value;
}
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DEFUN ("redirect-frame-focus", Fredirect_frame_focus, Sredirect_frame_focus,
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       1, 2, 0,
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  "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\
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\n\
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If FOCUS-FRAME is omitted or eq to FRAME, any existing redirection is\n\
cancelled, and the frame again receives its own keystrokes.\n\
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\n\
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The redirection lasts until the next call to `redirect-frame-focus'\n\
or `select-frame'.\n\
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\n\
This is useful for temporarily redirecting keystrokes to the minibuffer\n\
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window when a frame doesn't have its own minibuffer.")
  (frame, focus_frame)
    Lisp_Object frame, focus_frame;
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{
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  CHECK_LIVE_FRAME (frame, 0);
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  if (NILP (focus_frame))
    focus_frame = frame;
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  else
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    CHECK_LIVE_FRAME (focus_frame, 1);
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  XFRAME (frame)->focus_frame = focus_frame;
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  if (frame_rehighlight_hook)
    (*frame_rehighlight_hook) ();
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  return Qnil;
}


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DEFUN ("frame-focus", Fframe_focus, Sframe_focus, 1, 1, 0,
  "Return the frame to which FRAME's keystrokes are currently being sent.\n\
See `redirect-frame-focus'.")
  (frame)
    Lisp_Object frame;
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{
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  CHECK_LIVE_FRAME (frame, 0);
  return FRAME_FOCUS_FRAME (XFRAME (frame));
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}


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Lisp_Object
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get_frame_param (frame, prop)
     register struct frame *frame;
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     Lisp_Object prop;
{
  register Lisp_Object tem;

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  tem = Fassq (prop, frame->param_alist);
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  if (EQ (tem, Qnil))
    return tem;
  return Fcdr (tem);
}

void
store_in_alist (alistptr, propname, val)
     Lisp_Object *alistptr, val;
     char *propname;
{
  register Lisp_Object tem;
  register Lisp_Object prop;

  prop = intern (propname);
  tem = Fassq (prop, *alistptr);
  if (EQ (tem, Qnil))
    *alistptr = Fcons (Fcons (prop, val), *alistptr);
  else
    Fsetcdr (tem, val);
}

void
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store_frame_param (f, prop, val)
     struct frame *f;
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     Lisp_Object prop, val;
{
  register Lisp_Object tem;

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  tem = Fassq (prop, f->param_alist);
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  if (EQ (tem, Qnil))
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    f->param_alist = Fcons (Fcons (prop, val), f->param_alist);
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  else
    Fsetcdr (tem, val);
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  if (EQ (prop, Qminibuffer)
      && XTYPE (val) == Lisp_Window)
    {
      if (! MINI_WINDOW_P (XWINDOW (val)))
	error ("Surrogate minibuffer windows must be minibuffer windows.");

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      if (FRAME_HAS_MINIBUF (f) || FRAME_MINIBUF_ONLY_P (f))
	error ("Can't change the surrogate minibuffer of a frame with its own minibuffer.");
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      /* Install the chosen minibuffer window, with proper buffer.  */
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      f->minibuffer_window = val;
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    }
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}

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DEFUN ("frame-parameters", Fframe_parameters, Sframe_parameters, 0, 1, 0,
  "Return the parameters-alist of frame FRAME.\n\
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It is a list of elements of the form (PARM . VALUE), where PARM is a symbol.\n\
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The meaningful PARMs depend on the kind of frame.")
  (frame)
     Lisp_Object frame;
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{
  Lisp_Object alist;
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  struct frame *f;
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  if (EQ (frame, Qnil))
    f = selected_frame;
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  else
    {
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      CHECK_FRAME (frame, 0);
      f = XFRAME (frame);
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    }

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  if (f->display.nothing == 0)
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    return Qnil;