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#------------------------------------------------------------------------------
# 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 Atom, Enum, Range, ForwardTyped, Typed
from enaml.core.declarative import d_, observe
from .constraints_widget import ConstraintsWidget, ProxyConstraintsWidget
class Border(Atom):
""" A class for defining a border on a Frame.
Border instances should be treated as read-only once created.
"""
#: The style of the border.
style = Enum('box', 'panel', 'styled_panel')
#: The shadow style applied to the border.
line_style = Enum('plain', 'sunken', 'raised')
#: The thickness of the outer border line.
line_width = Range(low=0, value=1)
#: The thickness of the inner border line. This only has an effect
#: for the 'sunken' and 'raised' line styles.
midline_width = Range(low=0, value=0)
class ProxyFrame(ProxyConstraintsWidget):
""" The abstract definition of a proxy Frame object.
"""
#: A reference to the Frame declaration.
declaration = ForwardTyped(lambda: Frame)
def set_border(self, border):
raise NotImplementedError
class Frame(ConstraintsWidget):
""" A ConstraintsWidget that draws an optional border.
This class serves as a base class for widgets such as Container and
ScrollArea. It should not normally be used directly by user code.
"""
#: The border to apply to the frame. This may not be supported by
#: all toolkit backends.
border = d_(Typed(Border))
#: A reference to the ProxyContainer object.
proxy = Typed(ProxyFrame)
#--------------------------------------------------------------------------
# Observers
#--------------------------------------------------------------------------
@observe('border')
def _update_proxy(self, change):
""" An observer which updates the proxy when the border changes.
"""
# The superclass handler is sufficient
super(Frame, self)._update_proxy(change)
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