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|
#-------------------------------------------------------------------------------
#
# Traits UI DataBase manager
#
# Written by: David C. Morrill
#
# Date: 12/13/2005
#
# (c) Copyright 2005 by Enthought, Inc.
#
#-------------------------------------------------------------------------------
""" Defines the Traits UI database manager.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
import shelve
import os
import shutil
from enthought.traits.api \
import HasPrivateTraits, Enum, Instance, List, Str, Button, View, Item, \
SetEditor, Handler, VGroup, HGroup
from enthought.traits.trait_base \
import traits_home
from enthought.traits.ui.menu \
import NoButtons
#-------------------------------------------------------------------------------
# Returns the name of the traits UI database:
#-------------------------------------------------------------------------------
def ui_db_name ( ):
""" Returns the name of the traits UI database.
"""
return os.path.join( traits_home(), 'traits_ui' )
#-------------------------------------------------------------------------------
# Opens the traits UI database:
#-------------------------------------------------------------------------------
def get_ui_db ( mode = 'r' ):
""" Opens the traits UI database.
"""
try:
return shelve.open( ui_db_name(), flag = mode, protocol = -1 )
except:
return None
#-------------------------------------------------------------------------------
# 'TUIDB' class:
#-------------------------------------------------------------------------------
class TUIDB ( Handler ):
""" Handles the Traits UI database.
"""
#---------------------------------------------------------------------------
# Trait definitions:
#---------------------------------------------------------------------------
# All items currently in the database
all_items = List( Str )
# All items to be discarded from the database
discard = List( Str )
# Status message
status = Str
# Action buttons:
backup = Button( 'Backup' )
restore = Button( 'Restore' )
delete = Button( 'Delete' )
update = Button( 'Update' )
exit = Button( 'Exit' )
#---------------------------------------------------------------------------
# Trait view definitions:
#---------------------------------------------------------------------------
content = Item( 'discard{}', editor = SetEditor(
name = 'all_items',
left_column_title = 'Keep',
right_column_title = 'Delete' ) )
traits_view = View(
VGroup(
'<content>',
'_',
HGroup( 'backup', 'restore', 'update', 'delete', 'exit',
'10', 'status~',
show_labels = False )
),
title = 'Traits UI Database Utility',
id = 'enthought.traits.ui.tuidb',
width = 0.4,
height = 0.3,
resizable = True,
buttons = NoButtons
)
view = View(
VGroup(
'<content>',
'_',
HGroup( 'backup', 'restore', 'update', 'delete', '10', 'status~',
show_labels = False )
),
title = 'Traits UI DB',
id = 'enthought.traits.ui.tuidb_plugin'
)
#---------------------------------------------------------------------------
# Initializes the object:
#---------------------------------------------------------------------------
def __init__ ( self, **traits ):
""" Initializes the Traits UI database manager.
"""
super( TUIDB, self ).__init__( **traits )
self.update_all_items()
#---------------------------------------------------------------------------
# Determines the set of available database keys:
#---------------------------------------------------------------------------
def update_all_items ( self ):
""" Determines the set of available database keys.
"""
db = get_ui_db()
if db is not None:
keys = db.keys()
db.close()
keys.sort()
self.all_items = keys
#---------------------------------------------------------------------------
# Handles the 'discard' list being changed:
#---------------------------------------------------------------------------
def object_discard_changed ( self, info ):
""" Handles the **discard** list being changed.
"""
info.delete.enabled = (len( self.discard ) > 0)
#---------------------------------------------------------------------------
# Backs up the current traits UI database:
#---------------------------------------------------------------------------
def _backup_changed ( self ):
""" Backs up the current traits UI database.
"""
name = ui_db_name()
try:
shutil.copy( name, name + '.bak' )
self.status = 'The Traits UI database has been backed up'
except:
self.status = 'Could not back up the Traits UI database'
#---------------------------------------------------------------------------
# Restores the current backup of the traits UI database:
#---------------------------------------------------------------------------
def _restore_changed ( self ):
""" Restores the current backup of the traits UI database.
"""
name = ui_db_name()
try:
shutil.copy( name + '.bak', name )
self.update_all_items()
self.status = 'The Traits UI database has been restored'
except:
self.status = 'Could not restore the Traits UI database'
#---------------------------------------------------------------------------
# Deletes the specified items from the traits UI database:
#---------------------------------------------------------------------------
def _delete_changed ( self ):
""" Deletes the specified items from the traits UI database.
"""
db = get_ui_db( mode = 'c' )
if db is not None:
all_items = self.all_items
n = len( self.discard )
for item in self.discard:
del db[ item ]
all_items.remove( item )
db.close()
self.status = ('%d items deleted from the Traits UI database' % n)
self.discard = []
else:
self.status = 'Cannot access the Traits UI database'
#---------------------------------------------------------------------------
# Updates the list of defined items in the traits UI database:
#---------------------------------------------------------------------------
def _update_changed ( self ):
""" Updates the list of defined items in the traits UI database.
"""
self.update_all_items()
#---------------------------------------------------------------------------
# Exits the utility:
#---------------------------------------------------------------------------
def object_exit_changed ( self, info ):
""" Exits the utility.
"""
if info.initialized:
info.ui.dispose()
#-------------------------------------------------------------------------------
# Create export objects:
#-------------------------------------------------------------------------------
# Exported instance of TUIDB
tuidb = TUIDB()
#-------------------------------------------------------------------------------
# Run the utility:
#-------------------------------------------------------------------------------
if __name__ == '__main__':
tuidb.configure_traits()
|
