Class KeysPage

Lib/idlelib/configdialog.py:1111–1542

class KeysPage(Frame):

    def __init__(self, master, extpage):
        super().__init__(master)
        self.extpage = extpage
        self.cd = master.winfo_toplevel()
        self.create_page_keys()
        self.load_key_cfg()

    def create_page_keys(self):
        """Return frame of widgets for Keys tab.

        Enable users to provisionally change both individual and sets of
        keybindings (shortcut keys). Except for features implemented as
        extensions, keybindings are stored in complete sets called
        keysets. Built-in keysets in idlelib/config-keys.def are fixed
        as far as the dialog is concerned. Any keyset can be used as the
        base for a new custom keyset, stored in .idlerc/config-keys.cfg.

        Function load_key_cfg() initializes tk variables and keyset
        lists and calls load_keys_list for the current keyset.
        Radiobuttons builtin_keyset_on and custom_keyset_on toggle var
        keyset_source, which controls if the current set of keybindings
        are from a builtin or custom keyset. DynOptionMenus builtinlist
        and customlist contain lists of the builtin and custom keysets,
        respectively, and the current item from each list is stored in
        vars builtin_name and custom_name.

        Button delete_custom_keys invokes delete_custom_keys() to delete
        a custom keyset from idleConf.userCfg['keys'] and changes.  Button
        save_custom_keys invokes save_as_new_key_set() which calls
        get_new_keys_name() and create_new_key_set() to save a custom keyset
        and its keybindings to idleConf.userCfg['keys'].

        Listbox bindingslist contains all of the keybindings for the
        selected keyset.  The keybindings are loaded in load_keys_list()
        and are pairs of (event, [keys]) where keys can be a list
        of one or more key combinations to bind to the same event.
        Mouse button 1 click invokes on_bindingslist_select(), which
        allows button_new_keys to be clicked.

        So, an item is selected in listbindings, which activates
        button_new_keys, and clicking button_new_keys calls function
        get_new_keys().  Function get_new_keys() gets the key mappings from the
        current keyset for the binding event item that was selected.  The
        function then displays another dialog, GetKeysDialog, with the
        selected binding event and current keys and allows new key sequences
        to be entered for that binding event.  If the keys aren't
        changed, nothing happens.  If the keys are changed and the keyset
        is a builtin, function get_new_keys_name() will be called
        for input of a custom keyset name.  If no name is given, then the
        change to the keybinding will abort and no updates will be made.  If
        a custom name is entered in the prompt or if the current keyset was
        already custom (and thus didn't require a prompt), then
        idleConf.userCfg['keys'] is updated in function create_new_key_set()
        with the change to the event binding.  The item listing in bindingslist
        is updated with the new keys.  Var keybinding is also set which invokes
        the callback function, var_changed_keybinding, to add the change to