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/* flippers.c -- viewport edge flipping mechanism
   $Id: flippers.c,v 1.6 2000/07/27 14:37:56 john Exp $

   Copyright (C) 1999 John Harper <john@dcs.warwick.ac.uk>

   This file is part of sawmill.

   sawmill 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.

   sawmill is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   GNU General Public License for more details.

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

#include "sawmill.h"

static Window edge_left, edge_right, edge_top, edge_bottom;

DEFSYM(left, "left");
DEFSYM(right, "right");
DEFSYM(top, "top");
DEFSYM(bottom, "bottom");
DEFSYM(enter_flipper_hook, "enter-flipper-hook");
DEFSYM(leave_flipper_hook, "leave-flipper-hook");

DEFUN("enable-flippers", Fenable_flippers, Senable_flippers, (void), rep_Subr0)
    XMapRaised (dpy, edge_left);
    XMapRaised (dpy, edge_right);
    XMapRaised (dpy, edge_top);
    XMapRaised (dpy, edge_bottom);
    return Qt;

DEFUN("disable-flippers", Fdisable_flippers, Sdisable_flippers,
      (void), rep_Subr0)
    XUnmapWindow (dpy, edge_left);
    XUnmapWindow (dpy, edge_right);
    XUnmapWindow (dpy, edge_top);
    XUnmapWindow (dpy, edge_bottom);
    return Qt;

static repv
flipper_to_sym (Window w)
    if (w == edge_left)
      return Qleft;
    else if (w == edge_right)
      return Qright;
    else if (w == edge_top)
      return Qtop;
    else if (w == edge_bottom)
      return Qbottom;
      return Qnil;

static Window
sym_to_flipper (repv sym)
    if (sym == Qleft)
      return edge_left;
    else if (sym == Qright)
      return edge_right;
    else if (sym == Qtop)
      return edge_top;
    else if (sym == Qbottom)
      return edge_bottom;
      return 0;

static void
event_handler (XEvent *ev)
    switch (ev->xany.type)
      repv sym;

    case EnterNotify:
    case LeaveNotify:
      sym = flipper_to_sym (ev->xany.window);
      Fcall_hook ((ev->xany.type == EnterNotify)
                ? Qenter_flipper_hook : Qleave_flipper_hook,
                Fcons (sym, Qnil), Qnil);

DEFUN("flippers-after-restacking", Fflippers_after_restacking, 
      Sflippers_after_restacking, (void), rep_Subr0)
    /* Must keep edge windows raised so they always get the pointer */
    XRaiseWindow (dpy, edge_left);
    XRaiseWindow (dpy, edge_right);
    XRaiseWindow (dpy, edge_top);
    XRaiseWindow (dpy, edge_bottom);
    return Qt;

/* DL hooks / initialisation */

static Window
create_flipper (Window parent, int x, int y, int width, int height)
    Window w;
    XSetWindowAttributes wa;
    wa.override_redirect = True;
    w = XCreateWindow (dpy, parent, x, y, width, height, 0, 0,
                   InputOnly, preferred_visual, CWOverrideRedirect, &wa);
    if (w != 0)
      XSelectInput (dpy, w, EnterWindowMask | LeaveWindowMask
                  | VisibilityChangeMask);
      register_event_handler (w, event_handler);
    return w;

rep_dl_init (void)
    repv tem = rep_push_structure ("sawfish.wm.util.flippers");


    rep_INTERN (left);
    rep_INTERN (right);
    rep_INTERN (top);
    rep_INTERN (bottom);
    rep_INTERN_SPECIAL (enter_flipper_hook);
    rep_INTERN_SPECIAL (leave_flipper_hook);

    if (!batch_mode_p ())
      edge_left = create_flipper (root_window, 0, 0, 1, screen_height);
      edge_right = create_flipper (root_window, screen_width - 1, 0,
                             1, screen_height);
      edge_top = create_flipper (root_window, 0, 0, screen_width, 1);
      edge_bottom = create_flipper (root_window, 0, screen_height - 1,
                              screen_width, 1);

      add_hook (Qafter_restacking_hook, rep_VAL(&Sflippers_after_restacking));
      Fenable_flippers ();

    return rep_pop_structure (tem);

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