# Source code for enaml.widgets.group_box

    #------------------------------------------------------------------------------
    # Copyright (c) 2013-2025, Nucleic Development Team.
    #
    # Distributed under the terms of the Modified BSD License.
    #
    # The full license is in the file LICENSE, distributed with this software.
    #------------------------------------------------------------------------------
    from atom.api import Bool, Str, Enum, Typed, ForwardTyped

    from enaml.core.declarative import d_, observe

    from .container import Container, ProxyContainer

    class ProxyGroupBox(ProxyContainer):
        """ The abstract definition of a proxy GroupBox object.

        """
        #: A reference to the GroupBox declaration.
        declaration = ForwardTyped(lambda: GroupBox)

        def set_title(self, title):
            raise NotImplementedError

        def set_flat(self, flat):
            raise NotImplementedError

        def set_title_align(self, align):
            raise NotImplementedError

    class GroupBox(Container):
        """ The GroupBox container, which introduces a group of widgets with
        a title and usually has a border.

        """
        #: The title displayed at the top of the box.
        title = d_(Str())

        #: The flat parameter determines if the GroupBox is displayed with
        #: just the title and a header line (True) or with a full border
        #: (False, the default).
        flat = d_(Bool(False))

        #: The alignment of the title text.
        title_align = d_(Enum('left', 'right', 'center'))

        #: A reference to the ProxyGroupBox object.
        proxy = Typed(ProxyGroupBox)

        #--------------------------------------------------------------------------
        # Observers
        #--------------------------------------------------------------------------
        @observe('title', 'flat', 'title_align')
        def _update_proxy(self, change):
            """ An observer which sends state change to the proxy.

            """
            # The superclass handler implementation is sufficient.
            super(GroupBox, self)._update_proxy(change)