# -*- coding: utf-8; -*-
"""
Copyright (C) 2007-2013 Guake authors

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 2 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
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 this program; if not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301 USA
"""
import logging
import os
import re
import shutil

from textwrap import dedent

import gi

gi.require_version("Gtk", "3.0")
gi.require_version("Vte", "2.91")  # vte-0.38
from gi.repository import GLib
from gi.repository import Gdk
from gi.repository import Gio
from gi.repository import Gtk
from gi.repository import Vte

from guake.common import ShowableError
from guake.common import get_binaries_from_path
from guake.common import gladefile
from guake.common import hexify_color
from guake.common import pixmapfile
from guake.globals import ALIGN_BOTTOM
from guake.globals import ALIGN_CENTER
from guake.globals import ALIGN_LEFT
from guake.globals import ALIGN_RIGHT
from guake.globals import ALIGN_TOP
from guake.globals import ALWAYS_ON_PRIMARY
from guake.globals import MAX_TRANSPARENCY
from guake.globals import NAME
from guake.globals import QUICK_OPEN_MATCHERS
from guake.palettes import PALETTES
from guake.paths import AUTOSTART_FOLDER
from guake.paths import LOCALE_DIR
from guake.paths import LOGIN_DESTOP_PATH
from guake.simplegladeapp import SimpleGladeApp
from guake.terminal import GuakeTerminal
from guake.theme import list_all_themes
from guake.theme import select_gtk_theme

# pylint: disable=unsubscriptable-object

log = logging.getLogger(__name__)

# A regular expression to match possible python interpreters when
# filling interpreters combo in preferences (including bpython and ipython)
PYTHONS = re.compile(r"^[a-z]python$|^python\d\.\d$")

# Path to the shells file, it will be used to start to populate
# interpreters combo, see the next variable, its important to fill the
# rest of the combo too.
SHELLS_FILE = "/etc/shells"

# string to show in prefereces dialog for user shell option
USER_SHELL_VALUE = _("<user shell>")

# translating our types to vte types
ERASE_BINDINGS = {
    "ASCII DEL": "ascii-delete",
    "Escape sequence": "delete-sequence",
    "Control-H": "ascii-backspace",
}

HOTKEYS = [
    {
        "label": _("General"),
        "key": "general",
        "keys": [
            {"key": "show-hide", "label": _("Toggle Guake visibility")},
            {"key": "show-focus", "label": _("Show and focus Guake window")},
            {"key": "toggle-fullscreen", "label": _("Toggle Fullscreen")},
            {
                "key": "toggle-hide-on-lose-focus",
                "label": _("Toggle Hide on Lose Focus"),
            },
            {"key": "quit", "label": _("Quit")},
            {"key": "reset-terminal", "label": _("Reset terminal")},
            {"key": "search-terminal", "label": _("Search terminal")},
        ],
    },
    {
        "label": _("Tab management"),
        "key": "tab",
        "keys": [
            {"key": "new-tab", "label": _("New tab")},
            {"key": "new-tab-home", "label": _("New tab in home directory")},
            {"key": "close-tab", "label": _("Close tab")},
            {"key": "rename-current-tab", "label": _("Rename current tab")},
        ],
    },
    {
        "label": _("Split management"),
        "key": "split",
        "keys": [
            {"key": "split-tab-vertical", "label": _("Split tab vertical")},
            {"key": "split-tab-horizontal", "label": _("Split tab horizontal")},
            {"key": "close-terminal", "label": _("Close terminal")},
            {"key": "focus-terminal-up", "label": _("Focus terminal above")},
            {"key": "focus-terminal-down", "label": _("Focus terminal below")},
            {"key": "focus-terminal-left", "label": _("Focus terminal on the left")},
            {"key": "focus-terminal-right", "label": _("Focus terminal on the right")},
            {
                "key": "move-terminal-split-up",
                "label": _("Move the terminal split handle up"),
            },
            {
                "key": "move-terminal-split-down",
                "label": _("Move the terminal split handle down"),
            },
            {
                "key": "move-terminal-split-right",
                "label": _("Move the terminal split handle right"),
            },
            {
                "key": "move-terminal-split-left",
                "label": _("Move the terminal split handle left"),
            },
        ],
    },
    {
        "label": _("Navigation"),
        "key": "nav",
        "keys": [
            {"key": "previous-tab", "label": _("Go to previous tab")},
            {"key": "previous-tab-alt", "label": _("Go to previous tab (alternative)")},
            {"key": "next-tab", "label": _("Go to next tab")},
            {"key": "next-tab-alt", "label": _("Go to next tab (alternative)")},
            {"key": "move-tab-left", "label": _("Move current tab left")},
            {"key": "move-tab-right", "label": _("Move current tab right")},
            {"key": "switch-tab1", "label": _("Go to first tab")},
            {"key": "switch-tab2", "label": _("Go to second tab")},
            {"key": "switch-tab3", "label": _("Go to third tab")},
            {"key": "switch-tab4", "label": _("Go to fourth tab")},
            {"key": "switch-tab5", "label": _("Go to fifth tab")},
            {"key": "switch-tab6", "label": _("Go to sixth tab")},
            {"key": "switch-tab7", "label": _("Go to seventh tab")},
            {"key": "switch-tab8", "label": _("Go to eighth tab")},
            {"key": "switch-tab9", "label": _("Go to ninth tab")},
            {"key": "switch-tab10", "label": _("Go to tenth tab")},
            {"key": "switch-tab-last", "label": _("Go to last tab")},
        ],
    },
    {
        "label": _("Appearance"),
        "key": "appearance",
        "keys": [
            {"key": "zoom-out", "label": _("Zoom out")},
            {"key": "zoom-in", "label": _("Zoom in")},
            {"key": "zoom-in-alt", "label": _("Zoom in (alternative)")},
            {"key": "increase-height", "label": _("Increase height")},
            {"key": "decrease-height", "label": _("Decrease height")},
            {"key": "increase-transparency", "label": _("Increase transparency")},
            {"key": "decrease-transparency", "label": _("Decrease transparency")},
            {"key": "toggle-transparency", "label": _("Toggle transparency")},
        ],
    },
    {
        "label": _("Clipboard"),
        "key": "clipboard",
        "keys": [
            {"key": "clipboard-copy", "label": _("Copy text to clipboard")},
            {"key": "clipboard-paste", "label": _("Paste text from clipboard")},
        ],
    },
    {
        "label": _("Extra features"),
        "key": "extra",
        "keys": [
            {"key": "search-on-web", "label": _("Search selected text on web")},
        ],
    },
]

html_escape_table = {
    "&": "&amp;",
    '"': "&quot;",
    "'": "&apos;",
    ">": "&gt;",
    "<": "&lt;",
}

HOTKET_MODEL_INDEX_DCONF = 0
HOTKET_MODEL_INDEX_LABEL = 1
HOTKET_MODEL_INDEX_HUMAN_ACCEL = 2
HOTKET_MODEL_INDEX_ACCEL = 3


def html_escape(text):
    """Produce entities within text."""
    return "".join(html_escape_table.get(c, c) for c in text)


def refresh_user_start(settings):
    if not AUTOSTART_FOLDER or not LOGIN_DESTOP_PATH:
        return
    if settings.general.get_boolean("start-at-login"):
        autostart_path = os.path.expanduser(AUTOSTART_FOLDER)
        os.makedirs(autostart_path, exist_ok=True)
        shutil.copyfile(
            os.path.join(LOGIN_DESTOP_PATH, "autostart-guake.desktop"),
            os.path.join(os.path.expanduser(AUTOSTART_FOLDER), "guake.desktop"),
        )
    else:
        desktop_file = os.path.join(os.path.expanduser(AUTOSTART_FOLDER), "guake.desktop")
        if os.path.exists(desktop_file):
            os.remove(desktop_file)


class PrefsCallbacks:

    """Holds callbacks that will be used in the PrefsDialg class."""

    def __init__(self, prefDlg):
        self.prefDlg = prefDlg
        self.settings = prefDlg.settings

    # general tab

    def on_restore_tabs_startup_toggled(self, chk):
        """Changes the activity of restore-tabs-startup in dconf"""
        self.settings.general.set_boolean("restore-tabs-startup", chk.get_active())

    def on_restore_tabs_notify_toggled(self, chk):
        """Changes the activity of restore-tabs-notify in dconf"""
        self.settings.general.set_boolean("restore-tabs-notify", chk.get_active())

    def on_save_tabs_when_changed_toggled(self, chk):
        """Changes the activity of save-tabs-when-changed in dconf"""
        self.settings.general.set_boolean("save-tabs-when-changed", chk.get_active())

    def on_default_shell_changed(self, combo):
        """Changes the activity of default_shell in dconf"""
        citer = combo.get_active_iter()
        if not citer:
            return
        shell = combo.get_model().get_value(citer, 0)
        # we unset the value (restore to default) when user chooses to use
        # user shell as guake shell interpreter.
        if shell == USER_SHELL_VALUE:
            self.settings.general.reset("default-shell")
        else:
            self.settings.general.set_string("default-shell", shell)

    def on_use_login_shell_toggled(self, chk):
        """Changes the activity of use_login_shell in dconf"""
        self.settings.general.set_boolean("use-login-shell", chk.get_active())

    def on_open_tab_cwd_toggled(self, chk):
        """Changes the activity of open_tab_cwd in dconf"""
        self.settings.general.set_boolean("open-tab-cwd", chk.get_active())

    def on_use_trayicon_toggled(self, chk):
        """Changes the activity of use_trayicon in dconf"""
        self.settings.general.set_boolean("use-trayicon", chk.get_active())

    def on_use_popup_toggled(self, chk):
        """Changes the activity of use_popup in dconf"""
        self.settings.general.set_boolean("use-popup", chk.get_active())

    def on_workspace_specific_tab_sets_toggled(self, chk):
        """Sets the 'workspace-specific-tab-sets' property in dconf"""
        self.settings.general.set_boolean("workspace-specific-tab-sets", chk.get_active())

    def on_prompt_on_quit_toggled(self, chk):
        """Set the `prompt on quit' property in dconf"""
        self.settings.general.set_boolean("prompt-on-quit", chk.get_active())

    def on_prompt_on_close_tab_changed(self, combo):
        """Set the `prompt_on_close_tab' property in dconf"""
        self.settings.general.set_int("prompt-on-close-tab", combo.get_active())

    def on_gtk_theme_name_changed(self, combo):
        """Set the `gtk_theme_name' property in dconf"""
        citer = combo.get_active_iter()
        if not citer:
            return
        theme_name = combo.get_model().get_value(citer, 0)
        self.settings.general.set_string("gtk-theme-name", theme_name)
        select_gtk_theme(self.settings)

    def on_gtk_prefer_dark_theme_toggled(self, chk):
        """Set the `gtk_prefer_dark_theme' property in dconf"""
        self.settings.general.set_boolean("gtk-prefer-dark-theme", chk.get_active())
        select_gtk_theme(self.settings)

    def on_gtk_use_system_default_theme_toggled(self, chk):
        """Set the `gtk_prefer_dark_theme' property in dconf"""
        self.settings.general.set_boolean("gtk-use-system-default-theme", chk.get_active())
        select_gtk_theme(self.settings)

    def on_window_ontop_toggled(self, chk):
        """Changes the activity of window_ontop in dconf"""
        self.settings.general.set_boolean("window-ontop", chk.get_active())

    def on_tab_ontop_toggled(self, chk):
        """Changes the activity of tab_ontop in dconf"""
        self.settings.general.set_boolean("tab-ontop", chk.get_active())

    def on_new_tab_after_toggled(self, chk):
        """Changes the activity of new_tab_after in dconf"""
        self.settings.general.set_boolean("new-tab-after", chk.get_active())

    def on_quick_open_enable_toggled(self, chk):
        """Changes the activity of quick_open_enable in dconf"""
        self.settings.general.set_boolean("quick-open-enable", chk.get_active())

    def on_quick_open_in_current_terminal_toggled(self, chk):
        self.settings.general.set_boolean("quick-open-in-current-terminal", chk.get_active())

    def on_startup_script_changed(self, edt):
        self.settings.general.set_string("startup-script", edt.get_text())

    def on_window_refocus_toggled(self, chk):
        """Changes the activity of window_refocus in dconf"""
        self.settings.general.set_boolean("window-refocus", chk.get_active())

    def on_window_losefocus_toggled(self, chk):
        """Changes the activity of window_losefocus in dconf"""
        self.settings.general.set_boolean("window-losefocus", chk.get_active())

    def on_lazy_lose_focus_toggled(self, chk):
        """Changes the activity of lazy_lose_focus in dconf"""
        self.settings.general.set_boolean("lazy-losefocus", chk.get_active())

    def on_quick_open_command_line_changed(self, edt):
        self.settings.general.set_string("quick-open-command-line", edt.get_text())

    def on_hook_show_changed(self, edt):
        self.settings.hooks.set_string("show", edt.get_text())

    def on_window_tabbar_toggled(self, chk):
        """Changes the activity of window_tabbar in dconf"""
        self.settings.general.set_boolean("window-tabbar", chk.get_active())

    def on_fullscreen_hide_tabbar_toggled(self, chk):
        """Changes the activity of fullscreen_hide_tabbar in dconf"""
        self.settings.general.set_boolean("fullscreen-hide-tabbar", chk.get_active())

    def on_hide_tabs_if_one_tab_toggled(self, chk):
        """Changes the activity of hide_tabs_if_one_tab in dconf"""
        self.settings.general.set_boolean("hide-tabs-if-one-tab", chk.get_active())

    def on_start_fullscreen_toggled(self, chk):
        """Changes the activity of start_fullscreen in dconf"""
        self.settings.general.set_boolean("start-fullscreen", chk.get_active())

    def on_start_at_login_toggled(self, chk):
        """Changes the activity of start_at_login in dconf"""
        self.settings.general.set_boolean("start-at-login", chk.get_active())
        refresh_user_start(self.settings)

    def on_use_vte_titles_toggled(self, chk):
        """Save `use_vte_titles` property value in dconf"""
        self.settings.general.set_boolean("use-vte-titles", chk.get_active())

    def on_set_window_title_toggled(self, chk):
        """Save `set_window_title` property value in dconf"""
        self.settings.general.set_boolean("set-window-title", chk.get_active())

    def on_copy_on_select_toggled(self, chk):
        """Changes the value of copy_on_select in dconf"""
        self.settings.general.set_boolean("copy-on-select", chk.get_active())

    def on_tab_name_display_changed(self, combo):
        """Save `display-tab-names` property value in dconf"""
        self.settings.general.set_int("display-tab-names", combo.get_active())

    def on_max_tab_name_length_changed(self, spin):
        """Changes the value of max_tab_name_length in dconf"""
        val = int(spin.get_value())
        self.settings.general.set_int("max-tab-name-length", val)
        self.prefDlg.update_vte_subwidgets_states()

    def on_mouse_display_toggled(self, chk):
        """Set the 'appear on mouse display' preference in dconf. This
        property supercedes any value stored in display_n.
        """
        self.settings.general.set_boolean("mouse-display", chk.get_active())

    def on_right_align_toggled(self, chk):
        """set the horizontal alignment setting."""
        v = chk.get_active()
        self.settings.general.set_int("window-halignment", 1 if v else 0)

    def on_bottom_align_toggled(self, chk):
        """set the vertical alignment setting."""
        v = chk.get_active()
        self.settings.general.set_int("window-valignment", ALIGN_BOTTOM if v else ALIGN_TOP)

    def on_display_n_changed(self, combo):
        """Set the destination display in dconf."""

        i = combo.get_active_iter()
        if not i:
            return

        model = combo.get_model()
        first_item_path = model.get_path(model.get_iter_first())

        if model.get_path(i) == first_item_path:
            val_int = ALWAYS_ON_PRIMARY
        else:
            val = model.get_value(i, 0)
            val_int = int(val.split()[0])  # extracts 1 from '1' or from '1 (primary)'
        self.settings.general.set_int("display-n", val_int)

    def on_window_height_value_changed(self, hscale):
        """Changes the value of window_height in dconf"""
        val = hscale.get_value()
        self.settings.general.set_int("window-height", int(val))

    def on_window_width_value_changed(self, wscale):
        """Changes the value of window_width in dconf"""
        val = wscale.get_value()
        self.settings.general.set_int("window-width", int(val))

    def on_window_halign_value_changed(self, halign_button):
        """Changes the value of window_halignment in dconf"""
        which_align = {
            "radiobutton_align_left": ALIGN_LEFT,
            "radiobutton_align_right": ALIGN_RIGHT,
            "radiobutton_align_center": ALIGN_CENTER,
        }
        if halign_button.get_active():
            self.settings.general.set_int(
                "window-halignment", which_align[halign_button.get_name()]
            )
        self.prefDlg.get_widget("window_horizontal_displacement").set_sensitive(
            which_align[halign_button.get_name()] != ALIGN_CENTER
        )

    def on_use_audible_bell_toggled(self, chk):
        """Changes the value of use_audible_bell in dconf"""
        self.settings.general.set_boolean("use-audible-bell", chk.get_active())

    # scrolling tab

    def on_use_scrollbar_toggled(self, chk):
        """Changes the activity of use_scrollbar in dconf"""
        self.settings.general.set_boolean("use-scrollbar", chk.get_active())

    def on_history_size_value_changed(self, spin):
        """Changes the value of history_size in dconf"""
        val = int(spin.get_value())
        self.settings.general.set_int("history-size", val)
        self._update_history_widgets()

    def on_infinite_history_toggled(self, chk):
        self.settings.general.set_boolean("infinite-history", chk.get_active())
        self._update_history_widgets()

    def _update_history_widgets(self):
        infinite = self.prefDlg.get_widget("infinite_history").get_active()
        self.prefDlg.get_widget("history_size").set_sensitive(not infinite)

    def on_scroll_output_toggled(self, chk):
        """Changes the activity of scroll_output in dconf"""
        self.settings.general.set_boolean("scroll-output", chk.get_active())

    def on_scroll_keystroke_toggled(self, chk):
        """Changes the activity of scroll_keystroke in dconf"""
        self.settings.general.set_boolean("scroll-keystroke", chk.get_active())

    # appearance tab

    def on_use_default_font_toggled(self, chk):
        """Changes the activity of use_default_font in dconf"""
        self.settings.general.set_boolean("use-default-font", chk.get_active())

    def on_allow_bold_toggled(self, chk):
        """Changes the value of allow_bold in dconf"""
        self.settings.styleFont.set_boolean("allow-bold", chk.get_active())

    def on_bold_is_bright_toggled(self, chk):
        """Changes the value of bold_is_bright in dconf"""
        self.settings.styleFont.set_boolean("bold-is-bright", chk.get_active())

    def on_cell_height_scale_value_changed(self, scale):
        value = scale.get_value()
        self.settings.styleFont.set_double("cell-height-scale", value)

    def on_cell_width_scale_value_changed(self, scale):
        value = scale.get_value()
        self.settings.styleFont.set_double("cell-width-scale", value)

    def on_font_style_font_set(self, fbtn):
        """Changes the value of font_style in dconf"""
        self.settings.styleFont.set_string("style", fbtn.get_font_name())

    def on_background_image_file_chooser_file_changed(self, fc):
        self.settings.general.set_string(
            "background-image-file", fc.get_filename() if fc.get_filename() else ""
        )

    def on_background_image_file_remove_clicked(self, btn):
        filechooser = self.prefDlg.get_widget("background_image_filechooser")
        filechooser.unselect_all()
        self.on_background_image_file_chooser_file_changed(filechooser)

    def on_background_image_layout_mode_changed(self, combo):
        val = combo.get_active()
        self.settings.general.set_int("background-image-layout-mode", val)

    def on_transparency_value_changed(self, hscale):
        """Changes the value of background_transparency in dconf"""
        value = hscale.get_value()
        self.prefDlg.set_colors_from_settings()
        self.settings.styleBackground.set_int("transparency", MAX_TRANSPARENCY - int(value))

    # compatibility tab

    def on_backspace_binding_changed(self, combo):
        """Changes the value of compat_backspace in dconf"""
        val = combo.get_active_text()
        self.settings.general.set_string("compat-backspace", ERASE_BINDINGS[val])

    def on_delete_binding_changed(self, combo):
        """Changes the value of compat_delete in dconf"""
        val = combo.get_active_text()
        self.settings.general.set_string("compat-delete", ERASE_BINDINGS[val])

    def on_custom_command_file_chooser_file_changed(self, filechooser):
        self.settings.general.set_string("custom-command-file", filechooser.get_filename())

    def toggle_prompt_on_quit_sensitivity(self, combo):
        self.prefDlg.toggle_prompt_on_quit_sensitivity(combo)

    def toggle_style_sensitivity(self, chk):
        self.prefDlg.toggle_style_sensitivity(chk)

    def toggle_use_theme_sensitivity(self, chk):
        self.prefDlg.toggle_use_theme_sensitivity(chk)

    def toggle_use_font_background_sensitivity(self, chk):
        self.prefDlg.toggle_use_font_background_sensitivity(chk)

    def toggle_display_n_sensitivity(self, chk):
        self.prefDlg.toggle_display_n_sensitivity(chk)

    def toggle_show_tabbar_sensitivity(self, chk):
        self.prefDlg.toggle_show_tabbar_sensitivity(chk)

    def toggle_hide_on_lose_focus_sensitivity(self, chk):
        self.prefDlg.toggle_hide_on_lose_focus_sensitivity(chk)

    def toggle_quick_open_command_line_sensitivity(self, chk):
        self.prefDlg.toggle_quick_open_command_line_sensitivity(chk)

    def toggle_use_vte_titles(self, chk):
        self.prefDlg.toggle_use_vte_titles(chk)

    def update_vte_subwidgets_states(self):
        self.prefDlg.update_vte_subwidgets_states()

    def on_reset_compat_defaults_clicked(self, btn):
        self.prefDlg.on_reset_compat_defaults_clicked(btn)

    def on_palette_name_changed(self, combo):
        self.prefDlg.on_palette_name_changed(combo)

    def on_cursor_shape_changed(self, combo):
        self.prefDlg.on_cursor_shape_changed(combo)

    def on_blink_cursor_toggled(self, chk):
        self.prefDlg.on_blink_cursor_toggled(chk)

    def on_palette_color_set(self, btn):
        self.prefDlg.on_palette_color_set(btn)

    def on_window_vertical_displacement_value_changed(self, spin):
        """Changes the value of window-vertical-displacement"""
        self.settings.general.set_int("window-vertical-displacement", int(spin.get_value()))

    def on_window_horizontal_displacement_value_changed(self, spin):
        """Changes the value of window-horizontal-displacement"""
        self.settings.general.set_int("window-horizontal-displacement", int(spin.get_value()))

    def reload_erase_combos(self, btn=None):
        self.prefDlg.reload_erase_combos(btn)

    def gtk_widget_destroy(self, btn):
        self.prefDlg.gtk_widget_destroy(btn)


class PrefsDialog(SimpleGladeApp):

    """The Guake Preferences dialog."""

    def __init__(self, settings):
        """Setup the preferences dialog interface, loading images,
        adding filters to file choosers and connecting some signals.
        """
        self.hotkey_alread_used = False
        self.store = None

        super().__init__(gladefile("prefs.glade"), root="config-window")
        style_provider = Gtk.CssProvider()
        css_data = dedent(
            """
            .monospace{
              font-family: monospace;
            }
            """
        ).encode()
        style_provider.load_from_data(css_data)
        Gtk.StyleContext.add_provider_for_screen(
            Gdk.Screen.get_default(),
            style_provider,
            Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION,
        )
        self.get_widget("quick_open_command_line").get_style_context().add_class("monospace")
        self.get_widget("quick_open_supported_patterns").get_style_context().add_class("monospace")
        self.settings = settings

        self.add_callbacks(PrefsCallbacks(self))

        # window cleanup handler
        self.window = self.get_widget("config-window")
        self.get_widget("config-window").connect("destroy", self.on_destroy)

        # images
        ipath = pixmapfile("guake-notification.png")
        self.get_widget("image_logo").set_from_file(ipath)
        ipath = pixmapfile("quick-open.png")
        self.get_widget("image_quick_open").set_from_file(ipath)

        # Model format:
        # 0: the keybinding path in gsettings (str, hidden),
        # 1: label (str)
        # 2: human readable accelerator (str)
        # 3: gtk accelerator (str, hidden)
        self.store = Gtk.TreeStore(str, str, str, str)
        treeview = self.get_widget("treeview-keys")
        treeview.set_model(self.store)
        treeview.set_rules_hint(True)

        treeview.connect("button-press-event", self.start_editing)

        treeview.set_activate_on_single_click(True)

        renderer = Gtk.CellRendererText()
        column = Gtk.TreeViewColumn(_("Action"), renderer, text=1)
        column.set_property("expand", True)
        treeview.append_column(column)

        renderer = Gtk.CellRendererAccel()
        renderer.set_property("editable", True)
        renderer.set_property("accel-mode", 1)
        renderer.connect("accel-edited", self.on_accel_edited)
        renderer.connect("accel-cleared", self.on_accel_cleared)
        column = Gtk.TreeViewColumn(_("Shortcut"), renderer, text=2)
        column.pack_start(renderer, True)
        column.set_property("expand", False)
        column.add_attribute(renderer, "accel-mods", 0)
        column.add_attribute(renderer, "accel-key", 1)
        treeview.append_column(column)

        class fake_guake:
            pass

        fg = fake_guake()
        fg.window = self.window
        fg.settings = self.settings
        self.demo_terminal = GuakeTerminal(fg)
        self.demo_terminal_box = self.get_widget("demo_terminal_box")
        self.demo_terminal_box.add(self.demo_terminal)

        pid = self.spawn_sync_pid(None, self.demo_terminal)

        self.demo_terminal.pid = pid

        self.settings.general.bind(
            "tab-close-buttons",
            self.get_widget("tab-close-buttons"),
            "active",
            Gio.SettingsBindFlags.DEFAULT,
        )

        self.populate_shell_combo()
        self.populate_keys_tree()
        self.populate_display_n()
        self.populate_gtk_theme_names()
        self.load_configs()
        self.get_widget("config-window").hide()

    def spawn_sync_pid(self, directory=None, terminal=None):
        argv = []
        user_shell = self.settings.general.get_string("default-shell")
        if user_shell and os.path.exists(user_shell):
            argv.append(user_shell)
        else:
            argv.append(os.environ["SHELL"])

        login_shell = self.settings.general.get_boolean("use-login-shell")
        if login_shell:
            argv.append("--login")

        if isinstance(directory, str):
            wd = directory
        else:
            wd = os.environ["HOME"]

        pid = terminal.spawn_sync(
            Vte.PtyFlags.DEFAULT,
            wd,
            argv,
            [],
            GLib.SpawnFlags.DO_NOT_REAP_CHILD,
            None,
            None,
            None,
        )

        try:
            tuple_type = gi._gi.ResultTuple  # pylint: disable=c-extension-no-member
        except:  # pylint: disable=bare-except
            tuple_type = tuple
        if isinstance(pid, (tuple, tuple_type)):
            # Return a tuple in 2.91
            # https://lazka.github.io/pgi-docs/Vte-2.91/classes/Terminal.html#Vte.Terminal.spawn_sync
            pid = pid[1]
        if not isinstance(pid, int):
            raise TypeError("pid must be an int")
        return pid

    def show(self):
        """Calls the main window show_all method and presents the
        window in the desktop.
        """
        self.get_widget("config-window").show_all()
        self.get_widget("config-window").present()

    def hide(self):
        """Calls the main window hide function."""
        self.get_widget("config-window").hide()

    def on_destroy(self, window):
        self.demo_terminal.kill()
        self.demo_terminal.destroy()

    def toggle_prompt_on_quit_sensitivity(self, combo):
        """If toggle_on_close_tabs is set to 2 (Always), prompt_on_quit has no
        effect.
        """
        self.get_widget("prompt_on_quit").set_sensitive(combo.get_active() != 2)

    def toggle_style_sensitivity(self, chk):
        """If the user chooses to use the gnome default font
        configuration it means that he will not be able to use the
        font selector.
        """
        self.get_widget("font_style").set_sensitive(not chk.get_active())

    def toggle_use_theme_sensitivity(self, chk):
        """If the user chooses to use the gnome default theme
        configuration it means that he will not be able to use the
        theme selector.
        """
        self.get_widget("gtk_theme_name").set_sensitive(not chk.get_active())
        self.get_widget("gtk_prefer_dark_theme").set_sensitive(not chk.get_active())

    def toggle_use_font_background_sensitivity(self, chk):
        """If the user chooses to use the gnome default font
        configuration it means that he will not be able to use the
        font selector.
        """
        self.get_widget("palette_16").set_sensitive(chk.get_active())
        self.get_widget("palette_17").set_sensitive(chk.get_active())

    def toggle_hide_on_lose_focus_sensitivity(self, chk):
        """If the user chooses to not hide Guake on focus loss, lazy hiding on focus
        loss will do nothing.
        """
        self.get_widget("lazy_lose_focus").set_sensitive(chk.get_active())

    def toggle_show_tabbar_sensitivity(self, chk):
        """If the user chooses to not show the tab bar, it means that they
        cannot see the tab bar regardless of what other tab bar options say.
        """
        self.get_widget("fullscreen_hide_tabbar").set_sensitive(chk.get_active())
        self.get_widget("hide_tabs_if_one_tab").set_sensitive(chk.get_active())

    def toggle_display_n_sensitivity(self, chk):
        """When the user unchecks 'on mouse display', the option to select an
        alternate display should be enabled.
        """
        self.get_widget("display_n").set_sensitive(not chk.get_active())

    def toggle_quick_open_command_line_sensitivity(self, chk):
        """When the user unchecks 'enable quick open', the command line should be disabled"""
        self.get_widget("quick_open_command_line").set_sensitive(chk.get_active())
        self.get_widget("quick_open_in_current_terminal").set_sensitive(chk.get_active())

    def toggle_use_vte_titles(self, chk):
        """When vte titles aren't used, there is nothing to abbreviate"""
        self.update_vte_subwidgets_states()

    def update_vte_subwidgets_states(self):
        do_use_vte_titles = self.get_widget("use_vte_titles").get_active()
        self.get_widget("tab_name_display").set_sensitive(do_use_vte_titles)
        self.get_widget("lbl_tab_name_display").set_sensitive(do_use_vte_titles)
        self.get_widget("max_tab_name_length").set_sensitive(do_use_vte_titles)
        self.get_widget("lbl_max_tab_name_length").set_sensitive(do_use_vte_titles)

    def on_reset_compat_defaults_clicked(self, bnt):
        """Reset default values to compat_{backspace,delete} dconf
        keys. The default values are retrivied from the guake.schemas
        file.
        """
        self.settings.general.reset("compat-backspace")
        self.settings.general.reset("compat-delete")
        self.reload_erase_combos()

    def on_palette_name_changed(self, combo):
        """Changes the value of palette in dconf"""
        palette_name = combo.get_active_text()
        if palette_name not in PALETTES:
            return
        self.settings.styleFont.set_string("palette", PALETTES[palette_name])
        self.settings.styleFont.set_string("palette-name", palette_name)
        self.set_palette_colors(PALETTES[palette_name])
        self.update_demo_palette(PALETTES[palette_name])

    def on_cursor_shape_changed(self, combo):
        """Changes the value of cursor_shape in dconf"""
        index = combo.get_active()
        self.settings.style.set_int("cursor-shape", index)

    def on_blink_cursor_toggled(self, chk):
        """Changes the value of blink_cursor in dconf"""
        self.settings.style.set_int("cursor-blink-mode", chk.get_active())

    def on_palette_color_set(self, btn):
        """Changes the value of palette in dconf"""

        palette = []
        for i in range(18):
            palette.append(hexify_color(self.get_widget(f"palette_{i}").get_color()))
        palette = ":".join(palette)
        self.settings.styleFont.set_string("palette", palette)
        self.settings.styleFont.set_string("palette-name", _("Custom"))
        self.set_palette_name("Custom")
        self.update_demo_palette(palette)

    # this methods should be moved to the GuakeTerminal class FROM HERE

    def set_palette_name(self, palette_name):
        """If the given palette matches an existing one, shows it in the
        combobox
        """
        combo = self.get_widget("palette_name")
        found = False
        log.debug("wanting palette: %r", palette_name)
        for i in combo.get_model():
            if i[0] == palette_name:
                combo.set_active_iter(i.iter)
                found = True
                break
        if not found:
            combo.set_active(self.custom_palette_index)

    def update_demo_palette(self, palette):
        self.set_colors_from_settings()

    def set_colors_from_settings(self):
        transparency = self.settings.styleBackground.get_int("transparency")
        colorRGBA = Gdk.RGBA(0, 0, 0, 0)
        palette_list = []
        for color in self.settings.styleFont.get_string("palette").split(":"):
            colorRGBA.parse(color)
            palette_list.append(colorRGBA.copy())

        if len(palette_list) > 16:
            bg_color = palette_list[17]
        else:
            bg_color = Gdk.RGBA(255, 255, 255, 0)

            bg_color.alpha = 1 / 100 * transparency

        if len(palette_list) > 16:
            font_color = palette_list[16]
        else:
            font_color = Gdk.RGBA(0, 0, 0, 0)

        self.demo_terminal.set_color_foreground(font_color)
        self.demo_terminal.set_color_bold(font_color)
        self.demo_terminal.set_colors(font_color, bg_color, palette_list[:16])

    # TO HERE (see above)
    def fill_palette_names(self):
        combo = self.get_widget("palette_name")
        for palette in sorted(PALETTES):
            combo.append_text(palette)
        self.custom_palette_index = len(PALETTES)
        combo.append_text(_("Custom"))

    def set_cursor_shape(self, shape_index):
        self.get_widget("cursor_shape").set_active(shape_index)

    def set_cursor_blink_mode(self, mode_index):
        self.get_widget("cursor_blink_mode").set_active(mode_index)

    def set_palette_colors(self, palette):
        """Updates the color buttons with the given palette"""
        palette = palette.split(":")
        for i, pal in enumerate(palette):
            x, color = Gdk.Color.parse(pal)
            self.get_widget(f"palette_{i}").set_color(color)

    def reload_erase_combos(self, btn=None):
        """Read from dconf the value of compat_{backspace,delete} vars
        and select the right option in combos.
        """
        # backspace erase binding
        combo = self.get_widget("backspace-binding-combobox")
        binding = self.settings.general.get_string("compat-backspace")
        for i in combo.get_model():
            if ERASE_BINDINGS.get(i[0]) == binding:
                combo.set_active_iter(i.iter)
                break

        # delete erase binding
        combo = self.get_widget("delete-binding-combobox")
        binding = self.settings.general.get_string("compat-delete")
        for i in combo.get_model():
            if ERASE_BINDINGS.get(i[0]) == binding:
                combo.set_active_iter(i.iter)
                break

    def _load_hooks_settings(self):
        """load hooks settings"""
        log.debug("executing _load_hooks_settings")
        hook_show_widget = self.get_widget("hook_show")
        hook_show_setting = self.settings.hooks.get_string("show")
        if None not in (hook_show_widget, hook_show_setting):
            hook_show_widget.set_text(hook_show_setting)

    def _load_default_shell_settings(self):
        combo = self.get_widget("default_shell")
        # get the value for defualt shell. If unset, set to USER_SHELL_VALUE.
        value = self.settings.general.get_string("default-shell") or USER_SHELL_VALUE
        for i in combo.get_model():
            if i[0] == value:
                combo.set_active_iter(i.iter)
                break

    def _load_screen_settings(self):
        """Load screen settings"""
        # display number / use primary display
        combo = self.get_widget("display_n")
        dest_screen = self.settings.general.get_int("display-n")
        # If Guake is configured to use a screen that is not currently attached,
        # default to 'primary display' option.
        screen = self.get_widget("config-window").get_screen()
        n_screens = screen.get_n_monitors()
        if dest_screen > n_screens - 1:
            self.settings.general.set_boolean("mouse-display", False)
            dest_screen = screen.get_primary_monitor()
            self.settings.general.set_int("display-n", dest_screen)

        if dest_screen == ALWAYS_ON_PRIMARY:
            first_item = combo.get_model().get_iter_first()
            combo.set_active_iter(first_item)
        else:
            seen_first = False  # first item "always on primary" is special
            for i in combo.get_model():
                if seen_first:
                    i_int = int(i[0].split()[0])  # extracts 1 from '1' or from '1 (primary)'
                    if i_int == dest_screen:
                        combo.set_active_iter(i.iter)
                else:
                    seen_first = True

    def load_configs(self):
        """Load configurations for all widgets in General, Scrolling
        and Appearance tabs from dconf.
        """
        self._load_default_shell_settings()

        # restore tabs startup
        value = self.settings.general.get_boolean("restore-tabs-startup")
        self.get_widget("restore-tabs-startup").set_active(value)

        # restore tabs notify
        value = self.settings.general.get_boolean("restore-tabs-notify")
        self.get_widget("restore-tabs-notify").set_active(value)

        # save tabs when changed
        value = self.settings.general.get_boolean("save-tabs-when-changed")
        self.get_widget("save-tabs-when-changed").set_active(value)

        # login shell
        value = self.settings.general.get_boolean("use-login-shell")
        self.get_widget("use_login_shell").set_active(value)

        # tray icon
        value = self.settings.general.get_boolean("use-trayicon")
        self.get_widget("use_trayicon").set_active(value)

        # popup
        value = self.settings.general.get_boolean("use-popup")
        self.get_widget("use_popup").set_active(value)

        # workspace-specific tab sets
        value = self.settings.general.get_boolean("workspace-specific-tab-sets")
        self.get_widget("workspace-specific-tab-sets").set_active(value)

        # prompt on quit
        value = self.settings.general.get_boolean("prompt-on-quit")
        self.get_widget("prompt_on_quit").set_active(value)

        # prompt on close_tab
        value = self.settings.general.get_int("prompt-on-close-tab")
        self.get_widget("prompt_on_close_tab").set_active(value)
        self.get_widget("prompt_on_quit").set_sensitive(value != 2)

        # use system theme
        value = self.settings.general.get_boolean("gtk-use-system-default-theme")
        self.get_widget("gtk_use_system_default_theme").set_active(value)

        # gtk theme name
        value = self.settings.general.get_string("gtk-theme-name")
        combo = self.get_widget("gtk_theme_name")
        for i in combo.get_model():
            if i[0] == value:
                combo.set_active_iter(i.iter)
                break

        # prefer gtk dark theme
        value = self.settings.general.get_boolean("gtk-prefer-dark-theme")
        self.get_widget("gtk_prefer_dark_theme").set_active(value)

        # ontop
        value = self.settings.general.get_boolean("window-ontop")
        self.get_widget("window_ontop").set_active(value)

        # tab ontop
        value = self.settings.general.get_boolean("tab-ontop")
        self.get_widget("tab_ontop").set_active(value)

        # refocus
        value = self.settings.general.get_boolean("window-refocus")
        self.get_widget("window_refocus").set_active(value)

        # losefocus
        value = self.settings.general.get_boolean("window-losefocus")
        self.get_widget("window_losefocus").set_active(value)

        # lazy lose focus
        value = self.settings.general.get_boolean("lazy-losefocus")
        self.get_widget("lazy_lose_focus").set_active(value)

        # use VTE titles
        value = self.settings.general.get_boolean("use-vte-titles")
        self.get_widget("use_vte_titles").set_active(value)

        # set window title
        value = self.settings.general.get_boolean("set-window-title")
        self.get_widget("set_window_title").set_active(value)

        # set tab name display method
        self.get_widget("tab_name_display").set_sensitive(value)
        value = self.settings.general.get_int("display-tab-names")
        self.get_widget("tab_name_display").set_active(value)

        # max tab name length
        value = self.settings.general.get_int("max-tab-name-length")
        self.get_widget("max_tab_name_length").set_value(value)

        self.update_vte_subwidgets_states()

        value = self.settings.general.get_int("window-height")
        self.get_widget("window_height").set_value(value)

        value = self.settings.general.get_int("window-width")
        self.get_widget("window_width").set_value(value)

        # window displacements
        value = self.settings.general.get_int("window-vertical-displacement")
        self.get_widget("window_vertical_displacement").set_value(value)

        value = self.settings.general.get_int("window-horizontal-displacement")
        self.get_widget("window_horizontal_displacement").set_value(value)

        value = self.settings.general.get_int("window-halignment")
        which_button = {
            ALIGN_RIGHT: "radiobutton_align_right",
            ALIGN_LEFT: "radiobutton_align_left",
            ALIGN_CENTER: "radiobutton_align_center",
        }
        self.get_widget(which_button[value]).set_active(True)
        self.get_widget("window_horizontal_displacement").set_sensitive(value != ALIGN_CENTER)

        value = self.settings.general.get_boolean("open-tab-cwd")
        self.get_widget("open_tab_cwd").set_active(value)

        # tab bar
        value = self.settings.general.get_boolean("window-tabbar")
        self.get_widget("window_tabbar").set_active(value)

        # fullscreen hide tabbar
        value = self.settings.general.get_boolean("fullscreen-hide-tabbar")
        self.get_widget("fullscreen_hide_tabbar").set_active(value)

        # hide tabbar if only one tab
        value = self.settings.general.get_boolean("hide-tabs-if-one-tab")
        self.get_widget("hide_tabs_if_one_tab").set_active(value)

        # start fullscreen
        value = self.settings.general.get_boolean("start-fullscreen")
        self.get_widget("start_fullscreen").set_active(value)

        # start at GNOME login
        value = self.settings.general.get_boolean("start-at-login")
        self.get_widget("start_at_login").set_active(value)

        # use audible bell
        value = self.settings.general.get_boolean("use-audible-bell")
        self.get_widget("use_audible_bell").set_active(value)

        self._load_screen_settings()

        value = self.settings.general.get_boolean("quick-open-enable")
        self.get_widget("quick_open_enable").set_active(value)
        self.get_widget("quick_open_command_line").set_sensitive(value)
        self.get_widget("quick_open_in_current_terminal").set_sensitive(value)
        text = Gtk.TextBuffer()
        text = self.get_widget("quick_open_supported_patterns").get_buffer()
        for title, matcher, _useless in QUICK_OPEN_MATCHERS:
            text.insert_at_cursor(f"{title}: {matcher}\n")
        self.get_widget("quick_open_supported_patterns").set_buffer(text)

        value = self.settings.general.get_string("quick-open-command-line")
        if value is None:
            value = "subl %(file_path)s:%(line_number)s"
        self.get_widget("quick_open_command_line").set_text(value)

        value = self.settings.general.get_boolean("quick-open-in-current-terminal")
        self.get_widget("quick_open_in_current_terminal").set_active(value)

        value = self.settings.general.get_string("startup-script")
        if value:
            self.get_widget("startup_script").set_text(value)

        # use display where the mouse is currently
        value = self.settings.general.get_boolean("mouse-display")
        self.get_widget("mouse_display").set_active(value)

        # scrollbar
        value = self.settings.general.get_boolean("use-scrollbar")
        self.get_widget("use_scrollbar").set_active(value)

        # history size
        value = self.settings.general.get_int("history-size")
        self.get_widget("history_size").set_value(value)

        # infinite history
        value = self.settings.general.get_boolean("infinite-history")
        self.get_widget("infinite_history").set_active(value)

        # scroll output
        value = self.settings.general.get_boolean("scroll-output")
        self.get_widget("scroll_output").set_active(value)

        # scroll keystroke
        value = self.settings.general.get_boolean("scroll-keystroke")
        self.get_widget("scroll_keystroke").set_active(value)

        # default font
        value = self.settings.general.get_boolean("use-default-font")
        self.get_widget("use_default_font").set_active(value)
        self.get_widget("font_style").set_sensitive(not value)

        # use copy on select
        value = self.settings.general.get_boolean("copy-on-select")
        self.get_widget("copy_on_select").set_active(value)

        # font
        value = self.settings.styleFont.get_string("style")
        if value:
            self.get_widget("font_style").set_font_name(value)

        # allow bold font
        value = self.settings.styleFont.get_boolean("allow-bold")
        self.get_widget("allow_bold").set_active(value)

        # use bold is bright
        value = self.settings.styleFont.get_boolean("bold-is-bright")
        self.get_widget("bold_is_bright").set_active(value)

        # cell height scale
        value = self.settings.styleFont.get_double("cell-height-scale")
        self.get_widget("cell_height_scale_adjustment").set_value(value)

        # cell width scale
        value = self.settings.styleFont.get_double("cell-width-scale")
        self.get_widget("cell_width_scale_adjustment").set_value(value)

        # background image file
        filename = self.settings.general.get_string("background-image-file")
        if os.path.exists(filename):
            self.get_widget("background_image_filechooser").set_filename(filename)

        # background image layout mode
        value = self.settings.general.get_int("background-image-layout-mode")
        self.get_widget("background_image_layout_mode").set_active(value)

        # palette
        self.fill_palette_names()
        value = self.settings.styleFont.get_string("palette-name")
        self.set_palette_name(value)
        value = self.settings.styleFont.get_string("palette")
        self.set_palette_colors(value)
        self.update_demo_palette(value)

        # cursor shape
        value = self.settings.style.get_int("cursor-shape")
        self.set_cursor_shape(value)

        # cursor blink
        value = self.settings.style.get_int("cursor-blink-mode")
        self.set_cursor_blink_mode(value)

        value = self.settings.styleBackground.get_int("transparency")
        self.get_widget("background_transparency").set_value(MAX_TRANSPARENCY - value)

        value = self.settings.general.get_int("window-valignment")
        self.get_widget("top_align").set_active(value)

        # it's a separated method, to be reused.
        self.reload_erase_combos()

        # custom command context-menu configuration file
        custom_command_file = self.settings.general.get_string("custom-command-file")
        if custom_command_file:
            custom_command_file_name = os.path.expanduser(custom_command_file)
        else:
            custom_command_file_name = None
        custom_cmd_filter = Gtk.FileFilter()
        custom_cmd_filter.set_name(_("JSON files"))
        custom_cmd_filter.add_pattern("*.json")
        self.get_widget("custom_command_file_chooser").add_filter(custom_cmd_filter)
        all_files_filter = Gtk.FileFilter()
        all_files_filter.set_name(_("All files"))
        all_files_filter.add_pattern("*")
        self.get_widget("custom_command_file_chooser").add_filter(all_files_filter)
        if custom_command_file_name:
            self.get_widget("custom_command_file_chooser").set_filename(custom_command_file_name)

        # hooks
        self._load_hooks_settings()

    # -- populate functions --

    def populate_shell_combo(self):
        """Read the /etc/shells and looks for installed shells to
        fill the default_shell combobox.
        """
        cb = self.get_widget("default_shell")
        # append user shell as first option
        cb.append_text(USER_SHELL_VALUE)
        if os.path.exists(SHELLS_FILE):
            with open(SHELLS_FILE, encoding="utf-8") as f:
                for i in f.readlines():
                    possible = i.strip()
                    if possible and not possible.startswith("#") and os.path.exists(possible):
                        cb.append_text(possible)

        for i in get_binaries_from_path(PYTHONS):
            cb.append_text(i)

    def populate_gtk_theme_names(self):
        cb = self.get_widget("gtk_theme_name")
        for name in list_all_themes():
            name = name.strip()
            cb.append_text(name)

    def populate_keys_tree(self):
        """Reads the HOTKEYS global variable and insert all data in
        the TreeStore used by the preferences window treeview.
        """
        for group in HOTKEYS:
            parent = self.store.append(None, [None, group["label"], None, None])
            for item in group["keys"]:
                if item["key"] in ("show-hide", "show-focus"):
                    accel = self.settings.keybindingsGlobal.get_string(item["key"])
                else:
                    accel = self.settings.keybindingsLocal.get_string(item["key"])
                gsettings_path = item["key"]
                keycode, mask = Gtk.accelerator_parse(accel)
                keylabel = Gtk.accelerator_get_label(keycode, mask)
                self.store.append(parent, [gsettings_path, item["label"], keylabel, accel])
        self.get_widget("treeview-keys").expand_all()

    def populate_display_n(self):
        """Get the number of displays and populate this drop-down box
        with them all. Prepend the "always on primary" option.
        """
        cb = self.get_widget("display_n")
        screen = self.get_widget("config-window").get_screen()

        cb.append_text("always on primary")

        for m in range(0, int(screen.get_n_monitors())):
            if m == int(screen.get_primary_monitor()):
                # TODO l10n
                cb.append_text(str(m) + " " + "(primary)")
            else:
                cb.append_text(str(m))

    # -- key handling --

    def on_accel_edited(self, cellrendereraccel, path, key, mods, hwcode):
        """Callback that handles key edition in cellrenderer. It makes
        some tests to validate the key, like looking for already in
        use keys and look for [A-Z][a-z][0-9] to avoid problems with
        these common keys. If all tests are ok, the value will be
        stored in dconf.
        """
        accelerator = Gtk.accelerator_name(key, mods)

        dconf_path = self.store[path][HOTKET_MODEL_INDEX_DCONF]
        old_accel = self.store[path][HOTKET_MODEL_INDEX_HUMAN_ACCEL]
        keylabel = Gtk.accelerator_get_label(key, mods)

        # we needn't to change anything, the user is trying to set the
        # same key that is already set.
        if old_accel == accelerator:
            return False

        self.hotkey_alread_used = False

        # looking for already used keybindings

        def each_key(model, path, subiter):
            keyentry = model.get_value(subiter, HOTKET_MODEL_INDEX_ACCEL)
            if keyentry and keyentry == accelerator:
                self.hotkey_alread_used = True
                msg = _('The shortcut "%s" is already in use.') % html_escape(accelerator)
                ShowableError(self.window, _("Error setting keybinding."), msg, -1)
                raise Exception("This is ok, we just use it to break the foreach loop!")

        self.store.foreach(each_key)
        if self.hotkey_alread_used:
            return False

        # avoiding problems with common keys
        if (mods == 0 and key != 0) and (
            (ord("a") <= key <= ord("z"))
            or (ord("A") <= key <= ord("Z"))
            or (ord("0") <= key <= ord("9"))
        ):
            dialog = Gtk.MessageDialog(
                self.get_widget("config-window"),
                Gtk.DialogFlags.MODAL | Gtk.DialogFlags.DESTROY_WITH_PARENT,
                Gtk.MessageType.WARNING,
                Gtk.ButtonsType.OK,
                _(
                    'The shortcut "%s" cannot be used '
                    "because it will become impossible to "
                    "type using this key.\n\n"
                    "Please try with a key such as "
                    "Control, Alt or Shift at the same "
                    "time.\n"
                )
                % html_escape(chr(key)),
            )
            dialog.run()
            dialog.destroy()
            return False

        self.store[path][HOTKET_MODEL_INDEX_HUMAN_ACCEL] = keylabel

        if dconf_path in ("show-hide", "show-focus"):
            self.settings.keybindingsGlobal.set_string(dconf_path, accelerator)
        else:
            self.settings.keybindingsLocal.set_string(dconf_path, accelerator)
        self.store[path][HOTKET_MODEL_INDEX_ACCEL] = accelerator

    def on_accel_cleared(self, cellrendereraccel, path):
        """If the user tries to clear a keybinding with the backspace
        key this callback will be called and it just fill the model
        with an empty key and set the 'disabled' string in dconf path.
        """
        dconf_path = self.store[path][HOTKET_MODEL_INDEX_DCONF]
        self.store[path][HOTKET_MODEL_INDEX_HUMAN_ACCEL] = ""
        self.store[path][HOTKET_MODEL_INDEX_ACCEL] = "None"
        if dconf_path in ("show-focus", "show-hide"):
            self.settings.keybindingsGlobal.set_string(dconf_path, "disabled")
        else:
            self.settings.keybindingsLocal.set_string(dconf_path, "disabled")

    def start_editing(self, treeview, event):
        """Make the treeview grab the focus and start editing the cell
        that the user has clicked to avoid confusion with two or three
        clicks before editing a keybinding.

        Thanks to gnome-keybinding-properties.c =)
        """
        x, y = int(event.x), int(event.y)
        ret = treeview.get_path_at_pos(x, y)
        if not ret:
            return False

        path, column, cellx, celly = ret

        treeview.row_activated(path, Gtk.TreeViewColumn(None))
        treeview.set_cursor(path)

        return False


class KeyEntry:
    def __init__(self, keycode, mask):
        self.keycode = keycode
        self.mask = mask

    def __repr__(self):
        return f"KeyEntry({self.keycode}, {self.mask})"

    def __eq__(self, rval):
        return self.keycode == rval.keycode and self.mask == rval.mask


def setup_standalone_signals(instance):
    """Called when prefs dialog is running in standalone mode. It
    makes the delete event of dialog and click on close button finish
    the application.
    """
    window = instance.get_widget("config-window")
    window.connect("delete-event", Gtk.main_quit)

    # We need to block the execution of the already associated
    # callback before connecting the new handler.
    button = instance.get_widget("button1")
    button.handler_block_by_func(instance.gtk_widget_destroy)
    button.connect("clicked", Gtk.main_quit)

    return instance


if __name__ == "__main__":
    import builtins
    from locale import gettext
    from guake.globals import bindtextdomain

    builtins.__dict__["_"] = gettext

    bindtextdomain(NAME, LOCALE_DIR)

    setup_standalone_signals(PrefsDialog(None)).show()
    Gtk.main()
