/usr/share/doc/python-apptools/examples/appscripting/actions.py is in python-apptools 4.3.0-1.
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# Copyright (c) 2008, Riverbank Computing Limited
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in enthought/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!
#
# Author: Riverbank Computing Limited
# Description: <Enthought application scripting package component>
#------------------------------------------------------------------------------
# Enthought library imports.
from traits.api import Any, Instance, Str, Unicode
from pyface.action.api import Action
from pyface.workbench.api import WorkbenchWindow
# Local imports.
from model import Label
class BoundAction(Action):
"""An action with a bound object. The action is automatically disabled if
the bound object is None."""
#### 'BoundAction' interface ##############################################
# The bound object.
obj = Any
# The optional trait on obj that we are synch'ed with.
trait_name = Str
###########################################################################
# 'object' interface.
###########################################################################
def __init__(self, **traits):
"""Initialise the object."""
super(BoundAction, self).__init__(**traits)
# Fake an obj change to set the initial state.
self._obj_changed(None, self.obj)
###########################################################################
# Traits handlers.
###########################################################################
def _obj_changed(self, old, new):
"""Invoked when the bound object changes."""
if old is not None:
if self.trait_name:
# Ignore any changes to the old object.
old.on_trait_change(self._trait_changed, self.trait_name,
remove=True)
enabled = False
if new is not None:
if self.trait_name:
# Check for any changes on the new object.
new.on_trait_change(self._trait_changed, self.trait_name)
# Get the current state.
if getattr(new, self.trait_name):
enabled = True
else:
enabled = True
self.enabled = enabled
def _trait_changed(self, new):
"""Invoked when the trait on the bound object changes."""
self.enabled = new
class BoundWorkbenchAction(BoundAction):
"""A bound action whose object is being edited in a workbench editor. The
action is automatically rebound when the active editor changes."""
#### 'BoundWorkbenchAction' interface #####################################
# The type of the object that we will be enabled for. If it is None then
# we will be enabled for all types.
trait_type = Any
# The workbench window containing the action.
window = Instance(WorkbenchWindow)
###########################################################################
# 'object' interface.
###########################################################################
def __init__(self, **traits):
"""Initialise the object."""
super(BoundWorkbenchAction, self).__init__(**traits)
self.window.on_trait_change(self._editor_changed, 'active_editor')
# Fake an editor change to set the initial state.
self._editor_changed(self.window.active_editor)
###########################################################################
# Traits handlers.
###########################################################################
def _editor_changed(self, new):
"""Invoked when the active editor changes."""
obj = None
if new is not None:
if self.trait_type is None:
obj = new.obj
elif isinstance(new.obj, self.trait_type):
obj = new.obj
self.obj = obj
class LabelAction(BoundWorkbenchAction):
""" The LabelAction class is the base class for all actions that operate on
a Label.
"""
#### 'BoundWorkbenchAction' interface #####################################
# The type of the object that we will be enabled for.
trait_type = Label
#### 'BoundAction' interface ##############################################
# The bound object.
obj = Instance(Label)
class LabelIncrementSizeAction(LabelAction):
""" The LabelIncrementSizeAction class is a action that increases the size
of a label's text.
"""
#### 'Action' interface ###################################################
# The name of the action.
name = Unicode("&Increment size")
###########################################################################
# 'Action' interface.
###########################################################################
def perform(self, event):
self.obj.increment_size(1)
class LabelDecrementSizeAction(LabelAction):
""" The LabelDecrementSizeAction class is a action that decreases the size
of a label's text.
"""
#### 'Action' interface ###################################################
# The name of the action.
name = Unicode("&Decrement size")
###########################################################################
# 'Action' interface.
###########################################################################
def perform(self, event):
self.obj.decrement_size(1)
class LabelNormalFontAction(LabelAction):
""" The LabelNormalFontAction class is a action that sets a normal font for
a label's text.
"""
#### 'Action' interface ###################################################
# The name of the action.
name = Unicode("&Normal font")
###########################################################################
# 'Action' interface.
###########################################################################
def perform(self, event):
self.obj.style = 'normal'
class LabelBoldFontAction(LabelAction):
""" The LabelNormalFontAction class is a action that sets a bold font for a
label's text.
"""
#### 'Action' interface ###################################################
# The name of the action.
name = Unicode("&Bold font")
###########################################################################
# 'Action' interface.
###########################################################################
def perform(self, event):
self.obj.style = 'bold'
class LabelItalicFontAction(LabelAction):
""" The LabelNormalFontAction class is a action that sets an italic font
for a label's text.
"""
#### 'Action' interface ###################################################
# The name of the action.
name = Unicode("&Italic font")
###########################################################################
# 'Action' interface.
###########################################################################
def perform(self, event):
self.obj.style = 'italic'
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