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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
from traits.api import HasTraits, Int, Tuple
from pyface.i_layout_item import ILayoutItem, Size, SizePolicy
from pyface.i_widget import IWidget
class ILayoutWidget(IWidget, ILayoutItem):
""" Interface for widgets that can participate in layout.
Most widgets implement ILayoutWidget, but widgets like top-level windows,
menus, toolbars, etc. do not.
"""
pass
class MLayoutWidget(HasTraits):
""" A mixin for Widgets that can participate in layouts.
Most widgets implement ILayoutWidget, but widgets like top-level windows,
menus, toolbars, etc. do not.
"""
#: The minimum size that the widget can take.
minimum_size = Size
#: The maximum size that the widget can take.
maximum_size = Size
#: Weight factor used to distribute extra space between widgets.
stretch = Tuple(Int, Int)
#: How the widget should behave when more space is available.
size_policy = Tuple(SizePolicy, SizePolicy)
def _initialize_control(self):
""" Initialize the toolkit control. """
super()._initialize_control()
self._set_control_minimum_size(self.minimum_size)
self._set_control_maximum_size(self.maximum_size)
self._set_control_stretch(self.stretch)
self._set_control_size_policy(self.size_policy)
def _add_event_listeners(self):
""" Add trait observers and toolkit binding. """
super()._add_event_listeners()
self.observe(
self._minimum_size_updated,
"minimum_size",
dispatch="ui",
)
self.observe(
self._maximum_size_updated,
"maximum_size",
dispatch="ui",
)
self.observe(
self._stretch_updated,
"stretch",
dispatch="ui",
)
self.observe(
self._size_policy_updated,
"size_policy",
dispatch="ui",
)
def _remove_event_listeners(self):
""" Remove trait observers and toolkit binding. """
self.observe(
self._minimum_size_updated,
"minimum_size",
dispatch="ui",
remove=True,
)
self.observe(
self._maximum_size_updated,
"maximum_size",
dispatch="ui",
remove=True,
)
self.observe(
self._stretch_updated,
"stretch",
dispatch="ui",
remove=True,
)
self.observe(
self._size_policy_updated,
"size_policy",
dispatch="ui",
remove=True,
)
super()._remove_event_listeners()
def _minimum_size_updated(self, event):
""" Trait observer for minimum size. """
if self.control is not None:
self._set_control_minimum_size(event.new)
def _maximum_size_updated(self, event):
""" Trait observer for maximum size. """
if self.control is not None:
self._set_control_maximum_size(event.new)
def _stretch_updated(self, event):
""" Trait observer for stretch. """
if self.control is not None:
self._set_control_stretch(event.new)
def _size_policy_updated(self, event):
""" Trait observer for size policy. """
if self.control is not None:
self._set_control_size_policy(event.new)
def _set_control_minimum_size(self, size):
""" Set the minimum size of the control.
Toolkit implementations will need to override this method.
"""
raise NotImplementedError()
def _get_control_minimum_size(self):
""" Get the minimum size of the control.
Toolkit implementations will need to override this method.
This method is only used for testing.
"""
raise NotImplementedError()
def _set_control_maximum_size(self, size):
""" Set the maximum size of the control.
Toolkit implementations will need to override this method.
"""
raise NotImplementedError()
def _get_control_maximum_size(self):
""" Get the maximum size of the control.
Toolkit implementations will need to override this method.
This method is only used for testing.
"""
raise NotImplementedError()
def _set_control_stretch(self, stretch):
""" Set the stretch factor of the control.
Toolkit implementations will need to override this method.
"""
raise NotImplementedError()
def _get_control_stretch(self):
""" Get the stretch factor of the control.
Toolkit implementations will need to override this method.
This method is only used for testing.
"""
raise NotImplementedError()
def _set_control_size_policy(self, size_policy):
""" Set the size policy of the control.
Toolkit implementations will need to override this method.
"""
raise NotImplementedError()
def _get_control_size_policy(self):
""" Get the size policy of the control.
Toolkit implementations will need to override this method.
This method is only used for testing.
"""
raise NotImplementedError()
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