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#------------------------------------------------------------------------------
# Copyright (c) 2005, Enthought, Inc.
# 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: David C. Morrill
# Date: 12/02/2004
# Description: Define the Tkinter implementation of the various text editors and
# the text editor factory.
#
# Symbols defined: ToolkitEditorFactory
#
#------------------------------------------------------------------------------
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
import tk
from enthought.traits.api import Dict, Str, Any, true, false, TraitError
from editor import Editor
from editor_factory import EditorFactory
from constants import OKColor, ErrorColor
from helper import TkDelegate
#-------------------------------------------------------------------------------
# Define a simple identity mapping:
#-------------------------------------------------------------------------------
class _Identity ( object ):
def __call__ ( self, value ):
return value
#-------------------------------------------------------------------------------
# Trait definitions:
#-------------------------------------------------------------------------------
# Map from user input text to other value:
mapping_trait = Dict( Str, Any )
# Function used to evaluate textual user input:
evaluate_trait = Any( _Identity() )
#-------------------------------------------------------------------------------
# 'ToolkitEditorFactory' class:
#-------------------------------------------------------------------------------
class ToolkitEditorFactory ( EditorFactory ):
#---------------------------------------------------------------------------
# Trait definitions:
#---------------------------------------------------------------------------
mapping = mapping_trait # Dictionary mapping user input to other values
auto_set = true # Is user input set on every keystroke?
enter_set = false # Is user input set on enter key?
password = false # Is user input unreadable (i.e. password)?
evaluate = evaluate_trait # Function used to evaluate textual user input
#---------------------------------------------------------------------------
# 'Editor' factory methods:
#---------------------------------------------------------------------------
def simple_editor ( self, ui, object, name, description, parent ):
return SimpleEditor( parent,
factory = self,
ui = ui,
object = object,
name = name,
description = description )
def text_editor ( self, ui, object, name, description, parent ):
return SimpleEditor( parent,
factory = self,
ui = ui,
object = object,
name = name,
description = description )
#-------------------------------------------------------------------------------
# 'SimpleEditor' class:
#-------------------------------------------------------------------------------
class SimpleEditor ( Editor ):
#---------------------------------------------------------------------------
# Finishes initializing the editor by creating the underlying toolkit
# widget:
#---------------------------------------------------------------------------
def init ( self, parent ):
""" Finishes initializing the editor by creating the underlying toolkit
widget.
"""
factory = self.factory
var = tk.StringVar()
update_object = TkDelegate( self.update_object, var = var )
if factory.password:
control = tk.Entry( parent, textvariable = var, show = '*' )
else:
control = tk.Entry( parent, textvariable = var )
if factory.enter_set:
control.bind( '<Return>', update_object )
control.bind( '<FocusOut>', update_object )
if factory.auto_set:
control.bind( '<Any-KeyPress>', update_object )
self.control = control
#---------------------------------------------------------------------------
# Handles the user entering input data in the edit control:
#---------------------------------------------------------------------------
def update_object ( self, delegate ):
""" Handles the user entering input data in the edit control.
"""
try:
self.value = self._get_value()
self.control.configure( bg = OKColor )
#self.control.update()
except TraitError, excp:
pass
#---------------------------------------------------------------------------
# Updates the editor when the object trait changes external to the editor:
#---------------------------------------------------------------------------
def update_editor ( self ):
""" Updates the editor when the object trait changes external to the
editor.
"""
var = self.control.cget('textvariable' )
if self.factory.evaluate( var.get() ) != self.value:
var.set( self.str_value )
#self.control.update()
#---------------------------------------------------------------------------
# Gets the actual value corresponding to what the user typed:
#---------------------------------------------------------------------------
def _get_value ( self ):
""" Gets the actual value corresponding to what the user typed.
"""
value = self.control.cget( 'textvariable' ).get()
try:
value = self.factory.evaluate( value )
except:
pass
return self.factory.mapping.get( value, value )
#---------------------------------------------------------------------------
# Handles an error that occurs while setting the object's trait value:
#---------------------------------------------------------------------------
def error ( self, excp ):
""" Handles an error that occurs while setting the object's trait value.
"""
self.control.configure( bg = ErrorColor )
#self.control.update()
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