/* Pure GTK3 menu and toolbar module.
   Copyright (C) 2019-2020 Free Software Foundation, Inc.

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 3 of the License, 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.  If not, see <https://www.gnu.org/licenses/>.  */

/* This should be the first include, as it may set up #defines affecting
   interpretation of even the system includes.  */
#include <config.h>

#include "lisp.h"
#include "frame.h"
#include "window.h"
#include "character.h"
#include "buffer.h"
#include "keymap.h"
#include "coding.h"
#include "commands.h"
#include "blockinput.h"
#include "termhooks.h"
#include "keyboard.h"
#include "menu.h"
#include "pdumper.h"
#include "atimer.h"

#ifndef HAVE_GTK4
#include "gtkutil.h"
#else
#include "pgtksubr.h"
#endif

#include "gtkinter.h"
#include <gtk/gtk.h>

/* Gtk calls callbacks just because we tell it what item should be
   selected in a radio group.  If this variable is set to a non-zero
   value, we are creating menus and don't want callbacks right now.
*/
static bool pgtk_crazy_callback_abort;
static Lisp_Object *volatile menu_item_selection;

static volatile int popup_activated_flag;

Lisp_Object
pgtk_popup_dialog (struct frame *f, Lisp_Object header, Lisp_Object contents)
{
  Lisp_Object title;
  char *err_name = NULL;
  Lisp_Object selection;
  ptrdiff_t specpdl_count = SPECPDL_INDEX ();

  check_window_system (f);
  title = Fcar (contents);
  CHECK_STRING (title);

  if (NILP (Fcar (Fcdr (contents))))
    contents = list2 (title, Fcons (build_string ("OK"), Qt));

  list_of_panes (Fcons (contents, Qnil));

  record_unwind_protect_void (unuse_menu_items);
  block_input ();
  selection = pgtk_dialog_show (f, title, header, (const char **) &err_name);
  unblock_input ();
  unbind_to (specpdl_count, Qnil);

  discard_menu_items();

  if (err_name)
    error ("%s", err_name);

  return selection;
}

/* This callback is called from the menu bar pulldown menu
   when the user makes a selection.
   Figure out what the user chose
   and put the appropriate events into the keyboard buffer.  */
static void
menubar_selection_callback (GtkWidget *widget, gpointer client_data)
{
#ifndef HAVE_GTK4
  xg_menu_item_cb_data *cb_data = client_data;
#else
  egtk_menu_item_cb_data *cb_data = client_data;
#endif
  if (pgtk_crazy_callback_abort)
    return;

  if (! cb_data || ! cb_data->cl_data || ! cb_data->cl_data->f)
    return;

  /* For a group of radio buttons, GTK calls the selection callback first
     for the item that was active before the selection and then for the one that
     is active after the selection.  For C-h k this means we get the help on
     the deselected item and then the selected item is executed.  Prevent that
     by ignoring the non-active item.  */
#ifndef HAVE_GTK4
  if (GTK_IS_RADIO_MENU_ITEM (widget)
      && ! gtk_check_menu_item_get_active (GTK_CHECK_MENU_ITEM (widget)))
    return;
#endif

  /* When a menu is popped down, X generates a focus event (i.e. focus
     goes back to the frame below the menu).  Since GTK buffers events,
     we force it out here before the menu selection event.  Otherwise
     sit-for will exit at once if the focus event follows the menu selection
     event.  */

  block_input ();
#ifndef HAVE_GTK4
  while (gtk_events_pending ())
    gtk_main_iteration ();
#else
  while (g_main_context_pending (NULL))
    run_main_loop_iteration ();
#endif
  unblock_input ();

  find_and_call_menu_selection (cb_data->cl_data->f,
                                cb_data->cl_data->menu_bar_items_used,
                                cb_data->cl_data->menu_bar_vector,
                                cb_data->call_data);
#ifdef HAVE_GTK4
  GtkWidget *parent = (GTK_IS_POPOVER (widget) ? widget :
		       gtk_widget_get_parent
		       (gtk_widget_get_parent (gtk_widget_get_parent (widget))));
  gtk_popover_popdown (GTK_POPOVER (parent));
#endif
}

static void
menu_highlight_callback (GtkWidget *widget, gpointer call_data)
{
#ifdef HAVE_GTK4
  egtk_menu_item_cb_data *cb_data;
#else
  xg_menu_item_cb_data *cb_data;
#endif

  cb_data = g_object_get_data (G_OBJECT (widget), XG_ITEM_DATA);
  if (! cb_data) return;
}


/* This callback is invoked when a dialog or menu is finished being
   used and has been unposted.  */

static void
popup_deactivate_callback (GtkWidget *widget, gpointer client_data)
{
  popup_activated_flag = 0;
}
#ifdef HAVE_GTK4
static void
atimer_cb (struct atimer *at)
{
  set_frame_menubar (at->client_data, true, true);
}
#endif
/* Set the contents of the menubar widgets of frame F.
   The argument FIRST_TIME is currently ignored;
   it is set the first time this is called, from initialize_frame_menubar.  */

void
set_frame_menubar (struct frame *f, bool first_time, bool deep_p)
{
  block_input ();
  GtkWidget *menubar_widget;
#ifdef HAVE_GTK3
  GtkHeaderBar *hdb = NULL;
#endif
  Lisp_Object items;
  widget_value *wv, *first_wv, *prev_wv = 0;
  int i;
  int *submenu_start, *submenu_end;
  bool *submenu_top_level_items;
  int *submenu_n_panes;

#ifndef HAVE_GTK4
  menubar_widget = f->output_data.pgtk->menubar_widget;
#else
  menubar_widget = GTK_WIDGET (FRAME_MENU_BAR (f));
#endif
#ifdef HAVE_GTK3
  if (FRAME_PGTK_P (f))
    hdb = FRAME_GTK_HEADER_BAR (f);
#endif

#ifdef HAVE_GTK4
#define again FRAME_X_OUTPUT (f)->mbar_deep_atimer
  if (!deep_p)
    {
      save_menu_items ();
      again = start_atimer (ATIMER_RELATIVE, make_timespec (0, 2000),
			    atimer_cb, f);
      finish_menu_items ();
      unblock_input ();
      return;
    }
#undef again
#endif

  XSETFRAME (Vmenu_updating_frame, f);
#ifdef HAVE_GTK4
  deep_p = true;
#else
  deep_p = FRAME_EXTERNAL_MENU_BAR (f);
#endif

  if (deep_p)
    {
      struct buffer *prev = current_buffer;
      Lisp_Object buffer;
      ptrdiff_t specpdl_count = SPECPDL_INDEX ();
      int previous_menu_items_used = f->menu_bar_items_used;
      Lisp_Object *previous_items
	= alloca (previous_menu_items_used * sizeof *previous_items);
      int subitems;

      /* If we are making a new widget, its contents are empty,
	 do always reinitialize them.  */
#ifndef HAVE_GTK4
      if (! menubar_widget)
#endif
	previous_menu_items_used = 0;

      buffer = XWINDOW (FRAME_SELECTED_WINDOW (f))->contents;
      specbind (Qinhibit_quit, Qt);
      /* Don't let the debugger step into this code
	 because it is not reentrant.  */
      specbind (Qdebug_on_next_call, Qnil);

      record_unwind_save_match_data ();
      if (NILP (Voverriding_local_map_menu_flag))
	{
	  specbind (Qoverriding_terminal_local_map, Qnil);
	  specbind (Qoverriding_local_map, Qnil);
	}

      set_buffer_internal_1 (XBUFFER (buffer));

      /* Run the Lucid hook.  */
      safe_run_hooks (Qactivate_menubar_hook);

      /* If it has changed current-menubar from previous value,
	 really recompute the menubar from the value.  */
      if (! NILP (Vlucid_menu_bar_dirty_flag))
	call0 (Qrecompute_lucid_menubar);
      safe_run_hooks (Qmenu_bar_update_hook);
      fset_menu_bar_items (f, menu_bar_items (FRAME_MENU_BAR_ITEMS (f)));

      items = FRAME_MENU_BAR_ITEMS (f);

      /* Save the frame's previous menu bar contents data.  */
      if (previous_menu_items_used)
	memcpy (previous_items, XVECTOR (f->menu_bar_vector)->contents,
		previous_menu_items_used * word_size);

      /* Fill in menu_items with the current menu bar contents.
	 This can evaluate Lisp code.  */
      save_menu_items ();

      menu_items = f->menu_bar_vector;
      menu_items_allocated = VECTORP (menu_items) ? ASIZE (menu_items) : 0;
      subitems = ASIZE (items) / 4;
      submenu_start = alloca ((subitems + 1) * sizeof *submenu_start);
      submenu_end = alloca (subitems * sizeof *submenu_end);
      submenu_n_panes = alloca (subitems * sizeof *submenu_n_panes);
      submenu_top_level_items = alloca (subitems
					* sizeof *submenu_top_level_items);
      init_menu_items ();
      for (i = 0; i < subitems; i++)
	{
	  Lisp_Object key, string, maps;

	  key = AREF (items, 4 * i);
	  string = AREF (items, 4 * i + 1);
	  maps = AREF (items, 4 * i + 2);
	  if (NILP (string))
	    break;

	  submenu_start[i] = menu_items_used;

	  menu_items_n_panes = 0;
	  submenu_top_level_items[i]
	    = parse_single_submenu (key, string, maps);
	  submenu_n_panes[i] = menu_items_n_panes;

	  submenu_end[i] = menu_items_used;
	}

      submenu_start[i] = -1;
      finish_menu_items ();

      /* Convert menu_items into widget_value trees
	 to display the menu.  This cannot evaluate Lisp code.  */

      wv = make_widget_value ("menubar", NULL, true, Qnil);
      wv->button_type = BUTTON_TYPE_NONE;
      first_wv = wv;

      for (i = 0; submenu_start[i] >= 0; i++)
	{
	  menu_items_n_panes = submenu_n_panes[i];
	  wv = digest_single_submenu (submenu_start[i], submenu_end[i],
				      submenu_top_level_items[i]);
	  if (prev_wv)
	    prev_wv->next = wv;
	  else
	    first_wv->contents = wv;
	  /* Don't set wv->name here; GC during the loop might relocate it.  */
	  wv->enabled = true;
	  wv->button_type = BUTTON_TYPE_NONE;
	  prev_wv = wv;
	}

      set_buffer_internal_1 (prev);

      /* If there has been no change in the Lisp-level contents
	 of the menu bar, skip redisplaying it.  Just exit.  */

      /* Compare the new menu items with the ones computed last time.  */
      for (i = 0; i < previous_menu_items_used; i++)
	if (menu_items_used == i
	    || (!EQ (previous_items[i], AREF (menu_items, i))))
	  break;
      if (i == menu_items_used && i == previous_menu_items_used && i != 0)
	{
	  /* The menu items have not changed.  Don't bother updating
	     the menus in any form, since it would be a no-op.  */
	  free_menubar_widget_value_tree (first_wv);
	  discard_menu_items ();
	  unbind_to (specpdl_count, Qnil);
	  return;
	}

      /* The menu items are different, so store them in the frame.  */
      fset_menu_bar_vector (f, menu_items);
      f->menu_bar_items_used = menu_items_used;

      /* This undoes save_menu_items.  */
      unbind_to (specpdl_count, Qnil);

      /* Now GC cannot happen during the lifetime of the widget_value,
	 so it's safe to store data from a Lisp_String.  */
      wv = first_wv->contents;
      for (i = 0; i < ASIZE (items); i += 4)
	{
	  Lisp_Object string;
	  string = AREF (items, i + 1);
	  if (NILP (string))
            break;
          wv->name = SSDATA (string);
          update_submenu_strings (wv->contents);
          wv = wv->next;
	}

    }
  else
    {
      /* Make a widget-value tree containing
	 just the top level menu bar strings.  */

      wv = make_widget_value ("menubar", NULL, true, Qnil);
      wv->button_type = BUTTON_TYPE_NONE;
      first_wv = wv;

      items = FRAME_MENU_BAR_ITEMS (f);
      for (i = 0; i < ASIZE (items); i += 4)
	{
	  Lisp_Object string;

	  string = AREF (items, i + 1);
	  if (NILP (string))
	    break;

	  wv = make_widget_value (SSDATA (string), NULL, true, Qnil);
	  wv->button_type = BUTTON_TYPE_NONE;
	  /* This prevents lwlib from assuming this
	     menu item is really supposed to be empty.  */
	  /* The intptr_t cast avoids a warning.
	     This value just has to be different from small integers.  */
	  wv->call_data = (void *) (intptr_t) (-1);

	  if (prev_wv)
	    prev_wv->next = wv;
	  else
	    first_wv->contents = wv;
	  prev_wv = wv;
	}

      /* Forget what we thought we knew about what is in the
	 detailed contents of the menu bar menus.
	 Changing the top level always destroys the contents.  */
      f->menu_bar_items_used = 0;
    }

  pgtk_crazy_callback_abort = true;
#ifdef HAVE_GTK3
  if (hdb && FRAME_DISPLAY_HEADER_BAR_MENU (f))
    {
      xg_modify_header_bar_widgets (hdb,
				    f,
				    first_wv,
				    true,
				    G_CALLBACK (menubar_selection_callback),
				    G_CALLBACK (popup_deactivate_callback),
				    G_CALLBACK (menu_highlight_callback));
    }
#ifndef HAVE_GTK4
  else if (hdb)
    {
      xg_notify_header_bar_menu_state_changed (f);
    }
#endif
#endif
#ifdef HAVE_GTK4
  if (FRAME_EXTERNAL_MENU_BAR (f))
    FRAME_MENU_BAR (f) = build_popover_menu_bar
      (first_wv, make_cl_data (NULL, f, G_CALLBACK (menu_highlight_callback)),
       G_CALLBACK (menubar_selection_callback), G_CALLBACK (popup_deactivate_callback),
       G_CALLBACK (menu_highlight_callback), f, GTK_WIDGET (menubar_widget));
#endif

#ifndef HAVE_GTK4
  if (menubar_widget)
    {
      /* The fourth arg is DEEP_P, which says to consider the entire
	 menu trees we supply, rather than just the menu bar item names.  */
      xg_modify_menubar_widgets (menubar_widget,
                                 f,
                                 first_wv,
                                 deep_p,
                                 G_CALLBACK (menubar_selection_callback),
                                 G_CALLBACK (popup_deactivate_callback),
                                 G_CALLBACK (menu_highlight_callback));
    }
  else if (FRAME_EXTERNAL_MENU_BAR (f))
    {
      menubar_widget
        = xg_create_widget ("menubar", "menubar", f, first_wv,
                            G_CALLBACK (menubar_selection_callback),
                            G_CALLBACK (popup_deactivate_callback),
                            G_CALLBACK (menu_highlight_callback));

      f->output_data.pgtk->menubar_widget = menubar_widget;
    }
#endif
#ifndef HAVE_GTK4
  free_menubar_widget_value_tree (first_wv);
  xg_update_frame_menubar (f);
#endif
  pgtk_crazy_callback_abort = false;

  unblock_input ();
}



/* Called from Fx_create_frame to create the initial menubar of a frame
   before it is mapped, so that the window is mapped with the menubar already
   there instead of us tacking it on later and thrashing the window after it
   is visible.  */

void
initialize_frame_menubar (struct frame *f)
{
#ifdef HAVE_GTK4
  FRAME_MENU_BAR (f) = NULL;
  FRAME_X_OUTPUT (f)->lmme = Qnil;
#endif
  if (FRAME_MENU_BAR_LINES (f) && FRAME_EXTERNAL_MENU_BAR (f))
    {
      /* This function is called before the first chance to redisplay
	 the frame.  It has to be, so the frame will have the right size.  */
      fset_menu_bar_items (f, menu_bar_items (FRAME_MENU_BAR_ITEMS (f)));
      set_frame_menubar (f, true, true);
    }
}


void
pgtk_activate_menubar (struct frame *f)
{
  set_frame_menubar (f, false, false);

  /* f->output_data.pgtk->menubar_active = 1; */
}

static void
dialog_selection_callback (GtkWidget *widget, gpointer client_data)
{
  /* Treat the pointer as an integer.  There's no problem
     as long as pointers have enough bits to hold small integers.  */
  if ((intptr_t) client_data != -1)
    menu_item_selection = client_data;

  popup_activated_flag = 0;
}

static const char * button_names [] = {
  "button1", "button2", "button3", "button4", "button5",
  "button6", "button7", "button8", "button9", "button10" };

static void
cleanup_widget_value_tree (void *arg)
{
#ifndef HAVE_GTK4
  free_menubar_widget_value_tree (arg);
#endif
}

static void
pop_down_menu (void *arg)
{
  popup_activated_flag = 0;
#ifndef HAVE_GTK4
  block_input ();
  gtk_widget_destroy (GTK_WIDGET (arg));
  unblock_input ();
#endif
}

static void
create_and_show_dialog (struct frame *f, widget_value *first_wv)
{
  GtkWidget *menu;

  eassert (FRAME_X_P (f));
#ifndef HAVE_GTK4
  menu = xg_create_widget ("dialog", first_wv->name, f, first_wv,
                           G_CALLBACK (dialog_selection_callback),
                           G_CALLBACK (popup_deactivate_callback),
                           0);
#else
  menu = GTK_WIDGET (egtk_build_dialog (f, first_wv,
					G_CALLBACK (dialog_selection_callback),
					G_CALLBACK (popup_deactivate_callback)));
#endif

  if (menu)
    {
      ptrdiff_t specpdl_count = SPECPDL_INDEX ();
      record_unwind_protect_ptr (pop_down_menu, menu);
#ifndef HAVE_GTK4
      /* Display the menu.  */
      gtk_widget_show_all (menu);

      /* Process events that apply to the menu.  */
      ++popup_activated_flag;

      /* Process events in the Gtk event loop until done.  */
      while (popup_activated_flag)
	{
	  gtk_main_iteration ();
	}
#else
      gint response = gtk_dialog_run (GTK_DIALOG (menu));
      if (response != GTK_RESPONSE_CANCEL)
	gtk_widget_destroy (menu);
#endif
      unbind_to (specpdl_count, Qnil);
    }
}

extern Lisp_Object
pgtk_dialog_show (struct frame *f, Lisp_Object title,
		  Lisp_Object header, const char **error_name)
{
  int i, nb_buttons=0;
  char dialog_name[6];

  widget_value *wv, *first_wv = 0, *prev_wv = 0;

  /* Number of elements seen so far, before boundary.  */
  int left_count = 0;
  /* Whether we've seen the boundary between left-hand elts and right-hand.  */
  bool boundary_seen = false;

  ptrdiff_t specpdl_count = SPECPDL_INDEX ();

  eassert (FRAME_X_P (f));

  *error_name = NULL;

  if (menu_items_n_panes > 1)
    {
      *error_name = "Multiple panes in dialog box";
      return Qnil;
    }

  /* Create a tree of widget_value objects
     representing the text label and buttons.  */
  {
    Lisp_Object pane_name;
    const char *pane_string;
    pane_name = AREF (menu_items, MENU_ITEMS_PANE_NAME);
    pane_string = (NILP (pane_name)
		   ? "" : SSDATA (pane_name));
    prev_wv = make_widget_value ("message", (char *) pane_string, true, Qnil);
    first_wv = prev_wv;

    /* Loop over all panes and items, filling in the tree.  */
    i = MENU_ITEMS_PANE_LENGTH;
    while (i < menu_items_used)
      {

	/* Create a new item within current pane.  */
	Lisp_Object item_name, enable, descrip;
	item_name = AREF (menu_items, i + MENU_ITEMS_ITEM_NAME);
	enable = AREF (menu_items, i + MENU_ITEMS_ITEM_ENABLE);
	descrip
	  = AREF (menu_items, i + MENU_ITEMS_ITEM_EQUIV_KEY);

	if (NILP (item_name))
	  {
	    free_menubar_widget_value_tree (first_wv);
	    *error_name = "Submenu in dialog items";
	    return Qnil;
	  }
	if (EQ (item_name, Qquote))
	  {
	    /* This is the boundary between left-side elts
	       and right-side elts.  Stop incrementing right_count.  */
	    boundary_seen = true;
	    i++;
	    continue;
	  }
	if (nb_buttons >= 9)
	  {
	    free_menubar_widget_value_tree (first_wv);
	    *error_name = "Too many dialog items";
	    return Qnil;
	  }

	wv = make_widget_value (button_names[nb_buttons],
				SSDATA (item_name),
				!NILP (enable), Qnil);
	prev_wv->next = wv;
	if (!NILP (descrip))
	  wv->key = SSDATA (descrip);
	wv->call_data = aref_addr (menu_items, i);
	prev_wv = wv;

	if (! boundary_seen)
	  left_count++;

	nb_buttons++;
	i += MENU_ITEMS_ITEM_LENGTH;
      }

    /* If the boundary was not specified,
       by default put half on the left and half on the right.  */
    if (! boundary_seen)
      left_count = nb_buttons - nb_buttons / 2;

    wv = make_widget_value (dialog_name, NULL, false, Qnil);

    /*  Frame title: 'Q' = Question, 'I' = Information.
        Can also have 'E' = Error if, one day, we want
        a popup for errors. */
    if (NILP (header))
      dialog_name[0] = 'Q';
    else
      dialog_name[0] = 'I';

    /* Dialog boxes use a really stupid name encoding
       which specifies how many buttons to use
       and how many buttons are on the right. */
    dialog_name[1] = '0' + nb_buttons;
    dialog_name[2] = 'B';
    dialog_name[3] = 'R';
    /* Number of buttons to put on the right.  */
    dialog_name[4] = '0' + nb_buttons - left_count;
    dialog_name[5] = 0;
    wv->contents = first_wv;
    first_wv = wv;
  }

  /* No selection has been chosen yet.  */
  menu_item_selection = 0;

  /* Make sure to free the widget_value objects we used to specify the
     contents even with longjmp.  */
  record_unwind_protect_ptr (cleanup_widget_value_tree, first_wv);

  /* Actually create and show the dialog.  */
  create_and_show_dialog (f, first_wv);

  unbind_to (specpdl_count, Qnil);

  /* Find the selected item, and its pane, to return
     the proper value.  */
  if (menu_item_selection != 0)
    {
      i = 0;
      while (i < menu_items_used)
	{
	  Lisp_Object entry;

	  if (EQ (AREF (menu_items, i), Qt))
	    i += MENU_ITEMS_PANE_LENGTH;
	  else if (EQ (AREF (menu_items, i), Qquote))
	    {
	      /* This is the boundary between left-side elts and
		 right-side elts.  */
	      ++i;
	    }
	  else
	    {
	      entry
		= AREF (menu_items, i + MENU_ITEMS_ITEM_VALUE);
	      if (menu_item_selection == aref_addr (menu_items, i))
		return entry;
	      i += MENU_ITEMS_ITEM_LENGTH;
	    }
	}
    }
  else
    /* Make "Cancel" equivalent to C-g.  */
    quit ();

  return Qnil;
}

static void
popup_widget_loop
#ifndef HAVE_GTK4
(GtkWidget *widget)
#else
(GtkWidget *widget, GdkRectangle rect, struct frame *f)
#endif
{
  ++popup_activated_flag;

  /* Process events in the Gtk event loop until done.  */
#ifndef HAVE_GTK4
  while (popup_activated_flag)
#else
  while (popup_activated_flag &&
	 (!GTK_IS_POPOVER_MENU (widget) ? gtk_widget_is_visible (widget) : 1))
#endif
    {
      eassert (! NILP (menu_items));
#ifndef HAVE_GTK4
      gtk_main_iteration ();
#else
      run_main_loop_iteration ();
      gtk_popover_set_pointing_to (GTK_POPOVER (widget), &rect);
#endif
    }
#ifdef HAVE_GTK4
  gtk_widget_destroy (widget);
#endif
}
#ifndef HAVE_GTK4
static void
pgtk_dialog_selection_callback (GtkWidget *widget, gpointer client_data)
{
  /* Treat the pointer as an integer.  There's no problem
     as long as pointers have enough bits to hold small integers.  */
  if ((intptr_t) client_data != -1)
    menu_item_selection = client_data;

  popup_activated_flag = 0;
}
#endif
static void
popup_selection_callback2 (GtkWidget *widget, gpointer client_data)
{
#ifdef HAVE_GTK4
  egtk_menu_item_cb_data
#else
    xg_menu_item_cb_data
#endif
    *cb_data = client_data;

  if (pgtk_crazy_callback_abort) return;
  if (cb_data) menu_item_selection = cb_data->call_data;

#ifdef HAVE_GTK4
  popup_activated_flag = 0;
  GtkWidget *parent = (GTK_IS_POPOVER (widget) ? widget :
		       gtk_widget_get_parent
		       (gtk_widget_get_parent (gtk_widget_get_parent (widget))));
  gtk_widget_hide (parent);
#endif
}


static void
popup_deactivate_callback2 (GtkWidget *widget, gpointer client_data)
{
  popup_activated_flag = 0;
}

static void
menu_highlight_callback2 (GtkWidget *widget, gpointer call_data)
{
  /* xg_menu_item_cb_data *cb_data; */
  /* Lisp_Object help; */

  /* cb_data = g_object_get_data (G_OBJECT (widget), XG_ITEM_DATA); */
  /* if (! cb_data) return; */

  /* help = call_data ? cb_data->help : Qnil; */

  /* /\* If popup_activated_flag is greater than 1 we are in a popup menu. */
  /*    Don't pass the frame to show_help_event for those. */
  /*    Passing frame creates an Emacs event.  As we are looping in */
  /*    popup_widget_loop, it won't be handled.  Passing NULL shows the tip */
  /*    directly without using an Emacs event.  This is what the Lucid code */
  /*    does below.  *\/ */
  /* show_help_event (popup_activated_flag <= 1 ? cb_data->cl_data->f : NULL, */
  /*                  widget, help); */
  // TODO: NO-OP
}

/* Pop up the dialog for frame F defined by FIRST_WV and loop until the
   dialog pops down.
   menu_item_selection will be set to the selection.  */
#ifndef HAVE_GTK4
static void
pgtk_create_and_show_dialog (struct frame *f, widget_value *first_wv)
{
  GtkWidget *menu;

  eassert (FRAME_X_P (f));
  menu = xg_create_widget ("dialog", first_wv->name, f, first_wv,
                           G_CALLBACK (pgtk_dialog_selection_callback),
                           G_CALLBACK (popup_deactivate_callback2), 0);
  if (menu)
    {
      ptrdiff_t specpdl_count = SPECPDL_INDEX ();
      record_unwind_protect_ptr (pop_down_menu, menu);
      gtk_widget_show_all (menu);
      unbind_to (specpdl_count, Qnil);
    }
}
#endif

#ifndef GDK_VERSION_3_22
#ifndef HAVE_GTK4
static void
pos_func (GtkMenu *menu,
	  gint *x,
	  gint *y,
	  gboolean *push_in,
	  gpointer user_data)
{
  *x = ((GdkRectangle *) user_data)->x;
  *y = ((GdkRectangle *) user_data)->y;
  *push_in = true;
}
#endif
#endif

static void
create_and_show_popup_menu (struct frame *f, widget_value *first_wv,
			    int x, int y, bool for_click)
{
  GtkWidget *menu;
#ifndef HAVE_GTK4
  int i;
  pgtk_crazy_callback_abort = true;
  eassert (FRAME_X_P (f));
  menu = xg_create_widget ("popup", first_wv->name, f, first_wv,
                           G_CALLBACK (popup_selection_callback2),
                           G_CALLBACK (popup_deactivate_callback2),
                           G_CALLBACK (menu_highlight_callback2));
  pgtk_crazy_callback_abort = false;
  GdkRectangle rect;
  rect.x = x;
  rect.y = y;
  rect.width = 100;
  rect.height = 100;

  gtk_menu_attach_to_widget (GTK_MENU (menu), FRAME_GTK_OUTER_WIDGET (f), NULL);

  gtk_widget_show_all (GTK_WIDGET (menu));

#ifdef GDK_VERSION_3_22
  gtk_menu_popup_at_rect (GTK_MENU (menu),
			  gtk_widget_get_window (FRAME_GTK_OUTER_WIDGET (f)),
			  &rect, GDK_GRAVITY_NORTH_EAST, GDK_GRAVITY_NORTH_EAST,
			  FRAME_DISPLAY_INFO (f)->last_event);
#else
  gtk_menu_popup (GTK_MENU (menu), NULL, NULL, pos_func, &rect, 0, gtk_get_current_event_time ());
#endif
  popup_widget_loop (menu);
#else
  GdkRectangle rect;
  rect.x = x;
  rect.y = y;
  rect.width = 1;
  rect.height = 1;
  menu = GTK_WIDGET (build_mm_from_wv (first_wv, f,
				       G_CALLBACK (popup_selection_callback2),
				       G_CALLBACK (popup_deactivate_callback2),
				       G_CALLBACK (menu_highlight_callback2),
				       true, false, NULL, "", NULL, NULL, &rect));
  int m, n, z;
  gtk_widget_measure (menu, GTK_ORIENTATION_HORIZONTAL, true,
		      &m, &n, &z, &z);
  rect.x -= n / 2;
  gtk_popover_set_pointing_to (GTK_POPOVER (menu), &rect);
  gtk_popover_popup (GTK_POPOVER (menu));
  popup_widget_loop (menu, rect, f);
#endif
}

Lisp_Object
pgtk_menu_show (struct frame *f, int x, int y, int menuflags, Lisp_Object title,
                const char **error_name)
{
  block_input ();
  FRAME_X_OUTPUT (f)->menubar_or_popup_count++;
  int i;
  widget_value *wv, *save_wv = 0, *first_wv = 0, *prev_wv = 0;
  widget_value **submenu_stack
    = alloca (menu_items_used * sizeof *submenu_stack);
  Lisp_Object *subprefix_stack
    = alloca (menu_items_used * sizeof *subprefix_stack);
  int submenu_depth = 0;

  ptrdiff_t specpdl_count = SPECPDL_INDEX ();

  eassert (FRAME_X_P (f));

  *error_name = NULL;

  if (menu_items_used <= MENU_ITEMS_PANE_LENGTH)
    {
      *error_name = "Empty menu";
      return Qnil;
    }

  wv = make_widget_value ("menu", NULL, true, Qnil);
  wv->button_type = BUTTON_TYPE_NONE;
  first_wv = wv;
  bool first_pane = true;

  i = 0;
  while (i < menu_items_used)
    {
      if (NILP (AREF (menu_items, i)))
	{
	  submenu_stack[submenu_depth++] = save_wv;
	  save_wv = prev_wv;
	  prev_wv = 0;
	  first_pane = true;
	  i++;
	}
      else if (EQ (AREF (menu_items, i), Qlambda))
	{
	  prev_wv = save_wv;
	  save_wv = submenu_stack[--submenu_depth];
	  first_pane = false;
	  i++;
	}
      else if (EQ (AREF (menu_items, i), Qt)
	       && submenu_depth != 0)
	i += MENU_ITEMS_PANE_LENGTH;
      /* Ignore a nil in the item list.
	 It's meaningful only for dialog boxes.  */
      else if (EQ (AREF (menu_items, i), Qquote))
	i += 1;
      else if (EQ (AREF (menu_items, i), Qt))
	{
	  /* Create a new pane.  */
	  Lisp_Object pane_name, prefix;
	  const char *pane_string;

	  pane_name = AREF (menu_items, i + MENU_ITEMS_PANE_NAME);
	  prefix = AREF (menu_items, i + MENU_ITEMS_PANE_PREFIX);

#ifndef HAVE_MULTILINGUAL_MENU
	  if (STRINGP (pane_name) && STRING_MULTIBYTE (pane_name))
	    {
	      pane_name = ENCODE_MENU_STRING (pane_name);
	      ASET (menu_items, i + MENU_ITEMS_PANE_NAME, pane_name);
	    }
#endif
	  pane_string = (NILP (pane_name)
			 ? "" : SSDATA (pane_name));
	  /* If there is just one top-level pane, put all its items directly
	     under the top-level menu.  */
	  if (menu_items_n_panes == 1)
	    pane_string = "";

	  /* If the pane has a meaningful name,
	     make the pane a top-level menu item
	     with its items as a submenu beneath it.  */
	  if (!(menuflags & MENU_KEYMAPS) && strcmp (pane_string, ""))
	    {
	      wv = make_widget_value (pane_string, NULL, true, Qnil);
	      if (save_wv)
		save_wv->next = wv;
	      else
		first_wv->contents = wv;
	      if ((menuflags & MENU_KEYMAPS) && !NILP (prefix))
		wv->name++;
	      wv->button_type = BUTTON_TYPE_NONE;
	      save_wv = wv;
	      prev_wv = 0;
	    }
	  else if (first_pane)
	    {
	      save_wv = wv;
	      prev_wv = 0;
	    }
	  first_pane = false;
	  i += MENU_ITEMS_PANE_LENGTH;
	}
      else
	{
	  /* Create a new item within current pane.  */
	  Lisp_Object item_name, enable, descrip, def, type, selected, help;
	  item_name = AREF (menu_items, i + MENU_ITEMS_ITEM_NAME);
	  enable = AREF (menu_items, i + MENU_ITEMS_ITEM_ENABLE);
	  descrip = AREF (menu_items, i + MENU_ITEMS_ITEM_EQUIV_KEY);
	  def = AREF (menu_items, i + MENU_ITEMS_ITEM_DEFINITION);
	  type = AREF (menu_items, i + MENU_ITEMS_ITEM_TYPE);
	  selected = AREF (menu_items, i + MENU_ITEMS_ITEM_SELECTED);
	  help = AREF (menu_items, i + MENU_ITEMS_ITEM_HELP);

#ifndef HAVE_MULTILINGUAL_MENU
          if (STRINGP (item_name) && STRING_MULTIBYTE (item_name))
	    {
	      item_name = ENCODE_MENU_STRING (item_name);
	      ASET (menu_items, i + MENU_ITEMS_ITEM_NAME, item_name);
	    }

          if (STRINGP (descrip) && STRING_MULTIBYTE (descrip))
	    {
	      descrip = ENCODE_MENU_STRING (descrip);
	      ASET (menu_items, i + MENU_ITEMS_ITEM_EQUIV_KEY, descrip);
	    }
#endif /* not HAVE_MULTILINGUAL_MENU */

	  wv = make_widget_value (SSDATA (item_name), NULL, !NILP (enable),
				  STRINGP (help) ? help : Qnil);
	  if (prev_wv)
	    prev_wv->next = wv;
	  else
	    save_wv->contents = wv;
	  if (!NILP (descrip))
	    wv->key = SSDATA (descrip);
	  /* If this item has a null value,
	     make the call_data null so that it won't display a box
	     when the mouse is on it.  */
	  wv->call_data = !NILP (def) ? aref_addr (menu_items, i) : 0;

	  if (NILP (type))
	    wv->button_type = BUTTON_TYPE_NONE;
	  else if (EQ (type, QCtoggle))
	    wv->button_type = BUTTON_TYPE_TOGGLE;
	  else if (EQ (type, QCradio))
	    wv->button_type = BUTTON_TYPE_RADIO;
	  else
	    emacs_abort ();

	  wv->selected = !NILP (selected);

	  prev_wv = wv;

	  i += MENU_ITEMS_ITEM_LENGTH;
	}
    }

  if (!NILP (title))
    {
      widget_value *wv_title;
      widget_value *wv_sep1 = make_widget_value ("--", NULL, false, Qnil);
      widget_value *wv_sep2 = make_widget_value ("--", NULL, false, Qnil);

      wv_sep2->next = first_wv->contents;
      wv_sep1->next = wv_sep2;

#ifndef HAVE_MULTILINGUAL_MENU
      if (STRING_MULTIBYTE (title))
	title = ENCODE_MENU_STRING (title);
#endif

      wv_title = make_widget_value (SSDATA (title), NULL, true, Qnil);
      wv_title->button_type = BUTTON_TYPE_NONE;
      wv_title->next = wv_sep1;
      first_wv->contents = wv_title;
    }

  menu_item_selection = 0;
  record_unwind_protect_ptr (cleanup_widget_value_tree, first_wv);
  create_and_show_popup_menu (f, first_wv, x, y,
			      menuflags & MENU_FOR_CLICK);
  FRAME_X_OUTPUT (f)->menubar_or_popup_count--;
  unbind_to (specpdl_count, Qnil);

  if (menu_item_selection != 0)
    {
      Lisp_Object prefix, entry;

      prefix = entry = Qnil;
      i = 0;
      while (i < menu_items_used)
	{
	  if (NILP (AREF (menu_items, i)))
	    {
	      subprefix_stack[submenu_depth++] = prefix;
	      prefix = entry;
	      i++;
	    }
	  else if (EQ (AREF (menu_items, i), Qlambda))
	    {
	      prefix = subprefix_stack[--submenu_depth];
	      i++;
	    }
	  else if (EQ (AREF (menu_items, i), Qt))
	    {
	      prefix
		= AREF (menu_items, i + MENU_ITEMS_PANE_PREFIX);
	      i += MENU_ITEMS_PANE_LENGTH;
	    }
	  /* Ignore a nil in the item list.
	     It's meaningful only for dialog boxes.  */
	  else if (EQ (AREF (menu_items, i), Qquote))
	    i += 1;
	  else
	    {
	      entry
		= AREF (menu_items, i + MENU_ITEMS_ITEM_VALUE);
	      if (menu_item_selection == aref_addr (menu_items, i))
		{
		  if (menuflags & MENU_KEYMAPS)
		    {
		      int j;

		      entry = list1 (entry);
		      if (!NILP (prefix))
			entry = Fcons (prefix, entry);
		      for (j = submenu_depth - 1; j >= 0; j--)
			if (!NILP (subprefix_stack[j]))
			  entry = Fcons (subprefix_stack[j], entry);
		    }
		  unblock_input ();
		  return entry;
		}
	      i += MENU_ITEMS_ITEM_LENGTH;
	    }
	}
    }
  else if (!(menuflags & MENU_FOR_CLICK))
    {
      unblock_input ();
      /* Make "Cancel" equivalent to C-g.  */
      quit ();
    }
  unblock_input ();
  return Qnil;
}

/* The following is used by delayed window autoselection.  */

DEFUN ("menu-or-popup-active-p", Fmenu_or_popup_active_p, Smenu_or_popup_active_p, 0, 0, 0,
       doc: /* SKIP: real doc in xmenu.c.  */)
  (void)
{
  return
    FRAME_PGTK_P (XFRAME (selected_frame)) &&
    FRAME_X_OUTPUT (XFRAME (selected_frame))->menubar_or_popup_count ? Qt : Qnil;
}

void
syms_of_pgtkmenu (void)
{
  DEFSYM (Qdebug_on_next_call, "debug-on-next-call");
  DEFSYM (Qunsupported__w32_dialog, "unsupported--w32-dialog");

  defsubr (&Smenu_or_popup_active_p);
}