Source code for bokeh.models.widgets.buttons

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# Copyright (c) 2012 - 2022, Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
#
# The full license is in the file LICENSE.txt, distributed with this software.
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''' Various kinds of button widgets.

'''

#-----------------------------------------------------------------------------
# Boilerplate
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from __future__ import annotations

import logging # isort:skip
log = logging.getLogger(__name__)

#-----------------------------------------------------------------------------
# Imports
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# Standard library imports
from typing import TYPE_CHECKING, Callable

# Bokeh imports
from ...core.enums import ButtonType
from ...core.has_props import HasProps, abstract
from ...core.properties import (
    Bool,
    Either,
    Enum,
    Instance,
    List,
    Nullable,
    Override,
    Required,
    String,
    Tuple,
)
from ...events import ButtonClick, MenuItemClick
from ..callbacks import Callback
from ..ui.icons import BuiltinIcon, Icon
from ..ui.tooltips import Tooltip
from .widget import Widget

if TYPE_CHECKING:
    from ...util.callback_manager import EventCallback

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# Globals and constants
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__all__ = (
    'AbstractButton',
    'Button',
    'ButtonLike',
    'Dropdown',
    'HelpButton',
    'Toggle',
)

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# Dev API
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[docs]@abstract class ButtonLike(HasProps): ''' Shared properties for button-like widgets. ''' # explicit __init__ to support Init signatures def __init__(self, *args, **kwargs) -> None: super().__init__(*args, **kwargs) button_type = Enum(ButtonType, help=""" A style for the button, signifying it's role. Possible values are one of the following: .. bokeh-plot:: :source-position: none from bokeh.core.enums import ButtonType from bokeh.io import show from bokeh.layouts import column from bokeh.models import Button show(column( [Button(label=button_type, button_type=button_type) for button_type in ButtonType] )) """)
[docs]@abstract class AbstractButton(Widget, ButtonLike): ''' A base class that defines common properties for all button types. ''' # explicit __init__ to support Init signatures def __init__(self, *args, **kwargs) -> None: super().__init__(*args, **kwargs) label = String("Button", help=""" The text label for the button to display. """) icon = Nullable(Instance(Icon), help=""" An optional image appearing to the left of button's text. An instance of :class:`~bokeh.models.Icon` (such as :class:`~bokeh.models.BuiltinIcon`, :class:`~bokeh.models.SVGIcon`, or :class:`~bokeh.models.TablerIcon`).` """)
#----------------------------------------------------------------------------- # General API #-----------------------------------------------------------------------------
[docs]class Button(AbstractButton): ''' A click button. ''' # explicit __init__ to support Init signatures def __init__(self, *args, **kwargs) -> None: super().__init__(*args, **kwargs) label = Override(default="Button")
[docs] def on_click(self, handler: EventCallback) -> None: ''' Set up a handler for button clicks. Args: handler (func) : handler function to call when button is clicked. Returns: None ''' self.on_event(ButtonClick, handler)
[docs] def js_on_click(self, handler: Callback) -> None: ''' Set up a JavaScript handler for button clicks. ''' self.js_on_event(ButtonClick, handler)
[docs]class Toggle(AbstractButton): ''' A two-state toggle button. ''' # explicit __init__ to support Init signatures def __init__(self, *args, **kwargs) -> None: super().__init__(*args, **kwargs) label = Override(default="Toggle") active = Bool(False, help=""" The state of the toggle button. """)
[docs] def on_click(self, handler: Callable[[bool], None]) -> None: """ Set up a handler for button state changes (clicks). Args: handler (func) : handler function to call when button is toggled. Returns: None """ self.on_change('active', lambda attr, old, new: handler(new))
[docs] def js_on_click(self, handler: Callback) -> None: """ Set up a JavaScript handler for button state changes (clicks). """ self.js_on_change('active', handler)
[docs]class HelpButton(AbstractButton): """ A button with a help symbol that displays additional text when hovered over or clicked. """ # explicit __init__ to support Init signatures def __init__(self, *args, **kwargs) -> None: super().__init__(*args, **kwargs) tooltip = Required(Instance(Tooltip), help=""" A tooltip with plain text or rich HTML contents, providing general help or description of a widget's or component's function. """) label = Override(default="") icon = Override(default=lambda: BuiltinIcon("help", size=18)) button_type = Override(default="default")
#----------------------------------------------------------------------------- # Private API #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Code #-----------------------------------------------------------------------------