/*

 * Copyright © 2017 Christian Persch

 *

 * This program 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.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANMENUILITY 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 this program.  If not, see <http://www.gnu.org/licenses/>.

 */

#include "config.h"

#include "terminal-menu-button.h"

#include "terminal-intl.h"

#include "terminal-libgsystem.h"

/* All this just because GtkToggleButton:toggled is RUN_FIRST (and the

 * notify::active comes after the toggled signal). :-(

 */

enum

{

  UPDATE_MENU,

  LAST_SIGNAL

};

static guint signals[LAST_SIGNAL];

static void popup_menu_selection_done_cb (GtkMenu *menu,

                                          GtkMenuButton *button);

/* The menu button sets itself insensitive when it has no menu.

 * Work around this by using an empty menu.

 */

static void

set_empty_menu (GtkMenuButton *button)

{

  gs_unref_object GMenu *menu = g_menu_new ();

  gtk_menu_button_set_menu_model (button, G_MENU_MODEL (menu));

}

static void

disconnect_popup_menu (GtkMenuButton *button)

{

  GtkMenu *popup_menu = gtk_menu_button_get_popup (button);

  if (popup_menu)

    g_signal_handlers_disconnect_by_func

      (popup_menu, G_CALLBACK (popup_menu_selection_done_cb), button);

}

static void

popup_menu_selection_done_cb (GtkMenu *menu,

                              GtkMenuButton *button)

{

  disconnect_popup_menu (button);

  set_empty_menu (button);

}

/* Class implementation */

G_DEFINE_TYPE (TerminalMenuButton, terminal_menu_button, GTK_TYPE_MENU_BUTTON);

static void

terminal_menu_button_init (TerminalMenuButton *button_)

{

  GtkButton *button = GTK_BUTTON (button_);

  GtkMenuButton *menu_button = GTK_MENU_BUTTON (button_);

  gtk_button_set_relief (button, GTK_RELIEF_NONE);

  gtk_button_set_focus_on_click (button, FALSE);

  gtk_menu_button_set_use_popover (menu_button, FALSE);

  set_empty_menu (menu_button);

}

static void

terminal_menu_button_toggled (GtkToggleButton *button)

{

  gboolean active = gtk_toggle_button_get_active (button); /* this is already the new state */

  /* On activate, update the menu */

  if (active)

    g_signal_emit (button, signals[UPDATE_MENU], 0);

  GTK_TOGGLE_BUTTON_CLASS (terminal_menu_button_parent_class)->toggled (button);

}

static void

terminal_menu_button_update_menu (TerminalMenuButton *button)

{

  GtkMenuButton *gtk_button = GTK_MENU_BUTTON (button);

  GtkMenu *popup_menu = gtk_menu_button_get_popup (gtk_button);

  if (popup_menu)

    g_signal_connect (popup_menu, "selection-done",

                      G_CALLBACK (popup_menu_selection_done_cb), button);

}

static void

terminal_menu_button_dispose (GObject *object)

{

  disconnect_popup_menu (GTK_MENU_BUTTON (object));

  G_OBJECT_CLASS (terminal_menu_button_parent_class)->dispose (object);

}

static void

terminal_menu_button_class_init (TerminalMenuButtonClass *klass)

{

  klass->update_menu = terminal_menu_button_update_menu;

  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  object_class->dispose = terminal_menu_button_dispose;

  GtkToggleButtonClass *toggle_button_class = GTK_TOGGLE_BUTTON_CLASS (klass);

  toggle_button_class->toggled = terminal_menu_button_toggled;

  signals[UPDATE_MENU] =

    g_signal_new (I_("update-menu"),

                  G_OBJECT_CLASS_TYPE (klass),

                  G_SIGNAL_RUN_LAST,

                  G_STRUCT_OFFSET (TerminalMenuButtonClass, update_menu),

                  NULL, NULL,

                  g_cclosure_marshal_VOID__VOID,

                  G_TYPE_NONE,

                  0);

}

/* public API */

/**

 * terminal_menu_button_new:

 *

 * Returns: a new #TerminalMenuButton

 */

GtkWidget *

terminal_menu_button_new (void)

{

  return g_object_new (TERMINAL_TYPE_MENU_BUTTON, NULL);

}