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#------------------------------------------------------------------------------
# Copyright (c) 2007, Riverbank Computing Limited
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD license.
# However, when used with the GPL version of PyQt the additional terms described in the PyQt GPL exception also apply
#
# Author: Riverbank Computing Limited
#------------------------------------------------------------------------------
""" Defines the various editors for multi-selection enumerations, for the PyQt
user interface toolkit.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
import logging
from string import capitalize
from pyface.qt import QtCore, QtGui
from traits.api \
import List, Unicode, TraitError
# FIXME: ToolkitEditorFactory is a proxy class defined here just for backward
# compatibility. The class has been moved to the
# traitsui.editors.check_list_editor file.
from traitsui.editors.check_list_editor \
import ToolkitEditorFactory
from editor_factory \
import TextEditor as BaseTextEditor
from editor \
import EditorWithList
logger = logging.getLogger(__name__)
#-------------------------------------------------------------------------------
# 'SimpleEditor' class:
#-------------------------------------------------------------------------------
class SimpleEditor ( EditorWithList ):
""" Simple style of editor for checklists, which displays a combo box.
"""
#---------------------------------------------------------------------------
# Trait definitions:
#---------------------------------------------------------------------------
# Checklist item names
names = List( Unicode )
# Checklist item values
values = List
#---------------------------------------------------------------------------
# Finishes initializing the editor by creating the underlying toolkit
# widget:
#---------------------------------------------------------------------------
def init ( self, parent ):
""" Finishes initializing the editor by creating the underlying toolkit
widget.
"""
self.create_control( parent )
super( SimpleEditor, self ).init( parent )
#---------------------------------------------------------------------------
# Creates the initial editor control:
#---------------------------------------------------------------------------
def create_control ( self, parent ):
""" Creates the initial editor control.
"""
self.control = QtGui.QComboBox()
QtCore.QObject.connect(self.control,
QtCore.SIGNAL('activated(QString)'), self.update_object)
#---------------------------------------------------------------------------
# Handles the list of legal check list values being updated:
#---------------------------------------------------------------------------
def list_updated ( self, values ):
""" Handles updates to the list of legal checklist values.
"""
sv = self.string_value
if (len( values ) > 0) and isinstance( values[0], basestring ):
values = [ ( x, sv( x, capitalize ) ) for x in values ]
self.values = valid_values = [ x[0] for x in values ]
self.names = [ x[1] for x in values ]
# Make sure the current value is still legal:
modified = False
cur_value = parse_value( self.value )
for i in range( len( cur_value ) - 1, -1, -1 ):
if cur_value[i] not in valid_values:
try:
del cur_value[i]
modified = True
except TypeError, e:
logger.warn('Unable to remove non-current value [%s] from '
'values %s', cur_value[i], values)
if modified:
if isinstance( self.value, basestring ):
cur_value = ','.join( cur_value )
self.value = cur_value
self.rebuild_editor()
#---------------------------------------------------------------------------
# Rebuilds the editor after its definition is modified:
#---------------------------------------------------------------------------
def rebuild_editor ( self ):
""" Rebuilds the editor after its definition is modified.
"""
control = self.control
control.clear()
for name in self.names:
control.addItem(name)
self.update_editor()
#----------------------------------------------------------------------------
# Handles the user selecting a new value from the combo box:
#----------------------------------------------------------------------------
def update_object ( self, text ):
""" Handles the user selecting a new value from the combo box.
"""
value = self.values[self.names.index(unicode(text))]
if not isinstance(self.value, basestring):
value = [value]
self.value = value
#---------------------------------------------------------------------------
# Updates the editor when the object trait changes external to the editor:
#---------------------------------------------------------------------------
def update_editor ( self ):
""" Updates the editor when the object trait changes externally to the
editor.
"""
try:
self.control.setCurrentIndex(
self.values.index(parse_value(self.value)[0]))
except:
pass
#-------------------------------------------------------------------------------
# 'CustomEditor' class:
#-------------------------------------------------------------------------------
class CustomEditor ( SimpleEditor ):
""" Custom style of editor for checklists, which displays a set of check
boxes.
"""
#---------------------------------------------------------------------------
# Creates the initial editor control:
#---------------------------------------------------------------------------
def create_control ( self, parent ):
""" Creates the initial editor control.
"""
self.control = QtGui.QWidget()
layout = QtGui.QGridLayout(self.control)
layout.setContentsMargins(0, 0, 0, 0)
self._mapper = QtCore.QSignalMapper()
QtCore.QObject.connect(self._mapper,
QtCore.SIGNAL('mapped(const QString &)'), self.update_object)
#---------------------------------------------------------------------------
# Rebuilds the editor after its definition is modified:
#---------------------------------------------------------------------------
def rebuild_editor ( self ):
""" Rebuilds the editor after its definition is modified.
"""
# Clear any existing content:
self.clear_layout()
cur_value = parse_value( self.value )
# Create a sizer to manage the radio buttons:
labels = self.names
values = self.values
n = len( labels )
cols = self.factory.cols
rows = (n + cols - 1) / cols
incr = [ n / cols ] * cols
rem = n % cols
for i in range( cols ):
incr[i] += (rem > i)
incr[-1] = -(reduce( lambda x, y: x + y, incr[:-1], 0 ) - 1)
# Add the set of all possible choices:
layout = self.control.layout()
index = 0
for i in range( rows ):
for j in range( cols ):
if n > 0:
cb = QtGui.QCheckBox(labels[index])
cb.value = values[index]
if cb.value in cur_value:
cb.setCheckState(QtCore.Qt.Checked)
else:
cb.setCheckState(QtCore.Qt.Unchecked)
QtCore.QObject.connect(cb,
QtCore.SIGNAL('clicked()'),
self._mapper,
QtCore.SLOT('map()'))
self._mapper.setMapping(cb, labels[index])
layout.addWidget(cb, i, j)
index += incr[j]
n -= 1
#---------------------------------------------------------------------------
# Handles the user clicking one of the 'custom' check boxes:
#---------------------------------------------------------------------------
def update_object(self, label):
""" Handles the user clicking one of the custom check boxes.
"""
cb = self._mapper.mapping(label)
cur_value = parse_value(self.value)
if cb.checkState() == QtCore.Qt.Checked:
cur_value.append(cb.value)
elif cb.value in cur_value:
cur_value.remove(cb.value)
if isinstance(self.value, basestring):
cur_value = ','.join(cur_value)
self.value = cur_value
#---------------------------------------------------------------------------
# Updates the editor when the object trait changes external to the editor:
#---------------------------------------------------------------------------
def update_editor ( self ):
""" Updates the editor when the object trait changes externally to the
editor.
"""
new_values = parse_value( self.value )
for cb in self.control.findChildren(QtGui.QCheckBox, None):
if cb.value in new_values:
cb.setCheckState(QtCore.Qt.Checked)
else:
cb.setCheckState(QtCore.Qt.Unchecked)
#-------------------------------------------------------------------------------
# 'TextEditor' class:
#-------------------------------------------------------------------------------
class TextEditor ( BaseTextEditor ):
""" Text style of editor for checklists, which displays a text field.
"""
#---------------------------------------------------------------------------
# Handles the user changing the contents of the edit control:
#---------------------------------------------------------------------------
def update_object ( self, event=None ):
""" Handles the user changing the contents of the edit control.
"""
try:
value = unicode(self.control.text())
value = eval( value )
except:
pass
try:
self.value = value
except TraitError, excp:
pass
#-------------------------------------------------------------------------------
# Parse a value into a list:
#-------------------------------------------------------------------------------
def parse_value ( value ):
""" Parses a value into a list.
"""
if value is None:
return []
if type( value ) is not str:
return value[:]
return [ x.strip() for x in value.split( ',' ) ]
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