Source code for enamlnative.widgets.app_bar_layout

"""
Copyright (c) 2017-2022, CodeLV.

Distributed under the terms of the MIT License.

The full license is in the file LICENSE, distributed with this software.

Created on Mar 13, 2018

 
"""
from atom.api import Bool, ForwardTyped, Int, Typed, observe
from enaml.core.declarative import d_
from .linear_layout import LinearLayout, ProxyLinearLayout


class ProxyAppBarLayout(ProxyLinearLayout):
    """The abstract definition of a proxy AppBarLayout object."""

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

    def set_expanded(self, expanded):
        raise NotImplementedError


[docs]class AppBarLayout(LinearLayout):
    """AppBarLayout is a vertical LinearLayout which implements many of the
    features of material designs app bar concept, namely scrolling gestures.

    """

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

    #: Sets whether this AppBarLayout is expanded or not, animating if it has
    #: already been laid out.
    expanded = d_(Bool(True))

    #: The vertical offset for the parent AppBarLayout, in px
    vertical_offset = d_(Int(), writable=False)

    @observe("expanded")
    def _update_proxy(self, change):
        super()._update_proxy(change)