Source code for pyface.action.action

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""" The base class for all actions. """

from functools import partial

from traits.api import Bool, Callable, Enum, HasTraits, Str

from pyface.ui_traits import Image

[docs]class Action(HasTraits): """ The base class for all actions. An action is the non-UI side of a command which can be triggered by the end user. Actions are typically associated with buttons, menu items and tool bar tools. When the user triggers the command via the UI, the action's 'perform' method is invoked to do the actual work. """ # 'Action' interface --------------------------------------------------- #: Keyboard accelerator (by default the action has NO accelerator). accelerator = Str() #: Is the action checked? This is only relevant if the action style is #: 'radio' or 'toggle'. checked = Bool(False) #: A longer description of the action (used for context sensitive help etc). #: If no description is specified, the tooltip is used instead (and if there #: is no tooltip, then well, maybe you just hate your users ;^). description = Str() #: Is the action enabled? enabled = Bool(True) #: Is the action visible? visible = Bool(True) #: The action's unique identifier (may be None). id = Str() #: The action's image (displayed on tool bar tools etc). image = Image #: The action's name (displayed on menus/tool bar tools etc). name = Str() #: An (optional) callable that will be invoked when the action is performed. on_perform = Callable #: The action's style. style = Enum("push", "radio", "toggle", "widget") #: A short description of the action used for tooltip text etc. tooltip = Str() #: An (optional) callable to create the toolkit control for widget style. control_factory = Callable # ------------------------------------------------------------------------ # 'Action' interface. # ------------------------------------------------------------------------ # Initializers --------------------------------------------------------- def _id_default(self): """ Initializes the 'id' trait. The default is the ``name`` trait. """ return # Methods -------------------------------------------------------------#
[docs] def create_control(self, parent): """ Called when creating a "widget" style action. By default this will call whatever callable is supplied via the 'control_factory' trait which is a callable that should take the parent control and the action as arguments and return an appropriate toolkit control. Some operating systems (Mac OS in particular) may limit what widgets can be displayed in menus. This method is only used when the 'style' is "widget" and is ignored by other styles. Parameters ---------- parent : toolkit control The toolkit control, usually a toolbar. Returns ------- control : toolkit control A toolkit control or None. """ if == "widget" and self.control_factory is not None: return self.control_factory(parent, self) return None
[docs] def destroy(self): """ Called when the action is no longer required. By default this method does nothing, but this would be a great place to unhook trait listeners etc. """
[docs] def perform(self, event): """ Performs the action. Parameters ---------- event : ActionEvent instance The event which triggered the action. """ if self.on_perform is not None: self.on_perform()
[docs] @classmethod def factory(cls, *args, **kwargs): """ Create a factory for an action with the given arguments. This is particularly useful for passing context to Tasks schema additions. """ return partial(cls, *args, **kwargs)