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""" Manages a set of user perspectives. """
# Standard library imports.
import logging
import os
# Enthought library imports.
from pyface.workbench.api import Perspective
from traits.api import Any, Dict, HasTraits, Int, List, Property
from traits.api import Unicode
# Logging.
logger = logging.getLogger(__name__)
class UserPerspectiveManager(HasTraits):
""" Manages a set of user perspectives. """
#### 'UserPerspective' interface ##########################################
# A directory on the local file system that we can read and write to at
# will. This is used to persist window layout information, etc.
state_location = Unicode
# Next available user perspective id.
next_id = Property(Int)
# Dictionary mapping perspective id to user defined perspective definition.
id_to_perspective = Property(Dict)
# The list of user defined perspective definitions.
perspectives = Property(List)
# The name of the user defined perspectives definition file.
file_name = Property(Unicode)
#### Private interface ####################################################
# Shadow trait for the 'id_to_perspective' property.
_id_to_perspective = Any
###########################################################################
# 'UserPerspective' interface.
###########################################################################
#### Properties ###########################################################
def _get_next_id ( self ):
""" Property getter. """
# Get all of the current perspective ids:
ids = list(self.id_to_perspective.keys())
# If there are none:
if len( ids ) == 0:
# Return the starting id:
return 1
# Else return the current highest id + 1 as the next id:
ids.sort()
return int( ids[-1][19:-2] ) + 1
def _get_id_to_perspective ( self ):
""" Property getter. """
if self._id_to_perspective is None:
self._id_to_perspective = dic = {}
try:
fh = open( self.file_name, 'r' )
for line in fh:
data = line.split( ':', 1 )
if len( data ) == 2:
id, name = data[0].strip(), data[1].strip()
dic[ id ] = Perspective(
id = id,
name = name,
show_editor_area = False
)
fh.close()
except:
pass
return self._id_to_perspective
def _get_perspectives ( self ):
""" Property getter. """
return list(self.id_to_perspective.values())
def _get_file_name ( self ):
""" Property getter. """
return os.path.join(self.state_location, '__user_perspective__')
#### Methods ##############################################################
def create_perspective(self, name, show_editor_area=True):
""" Create a new (and empty) user-defined perspective. """
perspective = Perspective(
id = '__user_perspective_%09d__' % self.next_id,
name = name,
show_editor_area = show_editor_area
)
# Add the perspective to the map.
self.id_to_perspective[perspective.id] = perspective
# Update the persistent file information.
self._update_persistent_data()
return perspective
def clone_perspective(self, window, perspective, **traits):
""" Clone a perspective as a user perspective. """
clone = perspective.clone_traits()
# Give the clone a special user perspective Id!
clone.id = '__user_perspective_%09d__' % self.next_id
# Set any traits specified as keyword arguments.
clone.trait_set(**traits)
# Add the perspective to the map.
self.id_to_perspective[clone.id] = clone
# fixme: This needs to be pushed into the window API!!!!!!!
window._memento.perspective_mementos[clone.id] = (
window.layout.get_view_memento(),
window.active_view and window.active_view.id or None,
window.layout.is_editor_area_visible()
)
# Update the persistent file information.
self._update_persistent_data()
return clone
def save(self):
""" Persist the current state of the user perspectives. """
self._update_persistent_data()
return
def add(self, perspective, name=None):
""" Add a perspective with an optional name. """
# Define the id for the new perspective:
perspective.id = id = '__user_perspective_%09d__' % self.next_id
# Save the new name (if specified):
if name is not None:
perspective.name = name
# Create the perspective:
self.id_to_perspective[id] = perspective
# Update the persistent file information:
self._update_persistent_data()
# Return the new perspective created:
return perspective
def rename(self, perspective, name):
""" Rename the user perspective with the specified id. """
perspective.name = name
self.id_to_perspective[perspective.id].name = name
# Update the persistent file information:
self._update_persistent_data()
return
def remove(self, id):
""" Remove the user perspective with the specified id.
This method also updates the persistent data.
"""
if id in self.id_to_perspective:
del self.id_to_perspective[id]
# Update the persistent file information:
self._update_persistent_data()
# Try to delete the associated perspective layout file:
try:
os.remove(os.path.join(self.state_location, id))
except:
pass
return
###########################################################################
# Private interface.
###########################################################################
def _update_persistent_data(self):
""" Update the persistent file information. """
try:
fh = open( self.file_name, 'w' )
fh.write( '\n'.join( [ '%s: %s' % ( p.id, p.name )
for p in self.perspectives ] ) )
fh.close()
except:
logger.error( "Could not write the user defined perspective "
"definition file: " + self.file_name )
return
#### EOF ######################################################################
|
