/usr/lib/python2.7/dist-packages/traitsui/qt4/enum_editor.py is in python-traitsui 4.4.0-1.3.
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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.
# 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 and the editor factory for single-selection
enumerations, for the PyQt user interface toolkit.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
from string import capitalize
from pyface.qt import QtCore, QtGui
from traits.api \
import Bool, Property
# FIXME: ToolkitEditorFactory is a proxy class defined here just for backward
# compatibility. The class has been moved to the
# traitsui.editors.enum_editor file.
from traitsui.editors.enum_editor \
import ToolkitEditorFactory
from editor \
import Editor
from constants \
import OKColor, ErrorColor
from traitsui.helper \
import enum_values_changed
#-------------------------------------------------------------------------------
# 'BaseEditor' class:
#-------------------------------------------------------------------------------
class BaseEditor ( Editor ):
""" Base class for enumeration editors.
"""
#---------------------------------------------------------------------------
# Trait definitions:
#---------------------------------------------------------------------------
# Current set of enumeration names:
names = Property
# Current mapping from names to values:
mapping = Property
# Current inverse mapping from values to names:
inverse_mapping = Property
#---------------------------------------------------------------------------
# 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
if factory.name != '':
self._object, self._name, self._value = \
self.parse_extended_name( factory.name )
self.values_changed()
self._object.on_trait_change( self._values_changed,
' ' + self._name, dispatch = 'ui' )
else:
factory.on_trait_change( self.rebuild_editor, 'values_modified',
dispatch = 'ui' )
#---------------------------------------------------------------------------
# Gets the current set of enumeration names:
#---------------------------------------------------------------------------
def _get_names ( self ):
""" Gets the current set of enumeration names.
"""
if self._object is None:
return self.factory._names
return self._names
#---------------------------------------------------------------------------
# Gets the current mapping:
#---------------------------------------------------------------------------
def _get_mapping ( self ):
""" Gets the current mapping.
"""
if self._object is None:
return self.factory._mapping
return self._mapping
#---------------------------------------------------------------------------
# Gets the current inverse mapping:
#---------------------------------------------------------------------------
def _get_inverse_mapping ( self ):
""" Gets the current inverse mapping.
"""
if self._object is None:
return self.factory._inverse_mapping
return self._inverse_mapping
#---------------------------------------------------------------------------
# Rebuilds the contents of the editor whenever the original factory
# object's 'values' trait changes:
#---------------------------------------------------------------------------
def rebuild_editor ( self ):
""" Rebuilds the contents of the editor whenever the original factory
object's **values** trait changes.
"""
raise NotImplementedError
#---------------------------------------------------------------------------
# Recomputes the cached data based on the underlying enumeration model:
#---------------------------------------------------------------------------
def values_changed ( self ):
""" Recomputes the cached data based on the underlying enumeration model.
"""
self._names, self._mapping, self._inverse_mapping = \
enum_values_changed( self._value(), self.string_value )
#---------------------------------------------------------------------------
# Handles the underlying object model's enumeration set being changed:
#---------------------------------------------------------------------------
def _values_changed ( self ):
""" Handles the underlying object model's enumeration set being changed.
"""
self.values_changed()
self.rebuild_editor()
#---------------------------------------------------------------------------
# Disposes of the contents of an editor:
#---------------------------------------------------------------------------
def dispose ( self ):
""" Disposes of the contents of an editor.
"""
if self._object is not None:
self._object.on_trait_change( self._values_changed,
' ' + self._name, remove = True )
else:
self.factory.on_trait_change( self.rebuild_editor,
'values_modified', remove = True )
super( BaseEditor, self ).dispose()
#-------------------------------------------------------------------------------
# 'SimpleEditor' class:
#-------------------------------------------------------------------------------
class SimpleEditor ( BaseEditor ):
""" Simple style of enumeration editor, which displays a combo box.
"""
#---------------------------------------------------------------------------
# Finishes initializing the editor by creating the underlying toolkit
# widget:
#---------------------------------------------------------------------------
def init ( self, parent ):
""" Finishes initializing the editor by creating the underlying toolkit
widget.
"""
super( SimpleEditor, self ).init( parent )
self.control = control = self.create_combo_box()
control.addItems(self.names)
QtCore.QObject.connect(control,
QtCore.SIGNAL('currentIndexChanged(QString)'),
self.update_object)
if self.factory.evaluate is not None:
control.setEditable(True)
if self.factory.auto_set:
QtCore.QObject.connect(control,
QtCore.SIGNAL('editTextChanged(QString)'),
self.update_text_object)
else:
QtCore.QObject.connect(control.lineEdit(),
QtCore.SIGNAL('editingFinished()'),
self.update_autoset_text_object)
control.setInsertPolicy(QtGui.QComboBox.NoInsert)
self._no_enum_update = 0
self.set_tooltip()
#---------------------------------------------------------------------------
# Returns the QComboBox used for the editor control:
#---------------------------------------------------------------------------
def create_combo_box(self):
""" Returns the QComboBox used for the editor control.
"""
control = QtGui.QComboBox()
control.setSizeAdjustPolicy(QtGui.QComboBox.AdjustToContents)
control.setSizePolicy(QtGui.QSizePolicy.Maximum,
QtGui.QSizePolicy.Fixed)
return control
#---------------------------------------------------------------------------
# Adjust size policy to behave properly in group
#---------------------------------------------------------------------------
def set_size_policy(self, direction, resizable, springy, stretch) :
super(SimpleEditor, self).set_size_policy(direction, resizable, springy, stretch)
if ((direction == QtGui.QBoxLayout.LeftToRight and springy) or
(direction != QtGui.QBoxLayout.LeftToRight and resizable)) :
self.control.setSizeAdjustPolicy(QtGui.QComboBox.AdjustToContentsOnFirstShow)
#---------------------------------------------------------------------------
# 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.
"""
if self._no_enum_update == 0:
self._no_enum_update += 1
try:
self.value = self.mapping[unicode(text)]
except:
from traitsui.api import raise_to_debug
raise_to_debug()
self._no_enum_update -= 1
#---------------------------------------------------------------------------
# Handles the user typing text into the combo box text entry field:
#---------------------------------------------------------------------------
def update_text_object(self, text):
""" Handles the user typing text into the combo box text entry field.
"""
if self._no_enum_update == 0:
value = unicode(text)
try:
value = self.mapping[value]
except:
try:
value = self.factory.evaluate(value)
except Exception, excp:
self.error( excp )
return
self._no_enum_update += 1
self.value = value
self._set_background(OKColor)
self._no_enum_update -= 1
def update_autoset_text_object(self):
# Don't get the final text with the editingFinished signal
if self.control is not None:
text = self.control.lineEdit().text()
return self.update_text_object(text)
#---------------------------------------------------------------------------
# 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.
"""
if self._no_enum_update == 0:
self._no_enum_update += 1
if self.factory.evaluate is None:
try:
index = self.names.index(self.inverse_mapping[self.value])
self.control.setCurrentIndex(index)
except:
self.control.setCurrentIndex(-1)
else:
try:
self.control.setEditText(self.str_value)
except:
self.control.setEditText('')
self._no_enum_update -= 1
#---------------------------------------------------------------------------
# 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._set_background(ErrorColor)
#---------------------------------------------------------------------------
# Sets the background color of the QLineEdit of the QComboBox.
#---------------------------------------------------------------------------
def _set_background(self, col):
le = self.control.lineEdit()
pal = QtGui.QPalette(le.palette())
pal.setColor(QtGui.QPalette.Base, col)
le.setPalette(pal)
#---------------------------------------------------------------------------
# Rebuilds the contents of the editor whenever the original factory
# object's 'values' trait changes:
#---------------------------------------------------------------------------
def rebuild_editor ( self ):
""" Rebuilds the contents of the editor whenever the original factory
object's **values** trait changes.
"""
self.control.blockSignals(True)
self.control.clear()
self.control.addItems(self.names)
self.control.blockSignals(False)
self.update_editor()
#-------------------------------------------------------------------------------
# 'RadioEditor' class:
#-------------------------------------------------------------------------------
class RadioEditor ( BaseEditor ):
""" Enumeration editor, used for the "custom" style, that displays radio
buttons.
"""
# Is the button layout row-major or column-major?
row_major = Bool( False )
#---------------------------------------------------------------------------
# Finishes initializing the editor by creating the underlying toolkit
# widget:
#---------------------------------------------------------------------------
def init ( self, parent ):
""" Finishes initializing the editor by creating the underlying toolkit
widget.
"""
super( RadioEditor, self ).init( parent )
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(int)'),
self.update_object)
self.rebuild_editor()
#---------------------------------------------------------------------------
# Handles the user clicking one of the 'custom' radio buttons:
#---------------------------------------------------------------------------
def update_object ( self, index ):
""" Handles the user clicking one of the custom radio buttons.
"""
try:
self.value = self.mapping[self.names[index]]
except:
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 externally to the
editor.
"""
layout = self.control.layout()
value = self.value
for i in range(layout.count()):
rb = layout.itemAt(i).widget()
rb.setChecked(rb.value == value)
#---------------------------------------------------------------------------
# Rebuilds the contents of the editor whenever the original factory
# object's 'values' trait changes:
#---------------------------------------------------------------------------
def rebuild_editor ( self ):
""" Rebuilds the contents of the editor whenever the original factory
object's **values** trait changes.
"""
# Clear any existing content:
self.clear_layout()
# Get the current trait value:
cur_name = self.str_value
# Create a sizer to manage the radio buttons:
names = self.names
mapping = self.mapping
n = len( names )
cols = self.factory.cols
rows = (n + cols - 1) / cols
if self.row_major:
incr = [ 1 ] * cols
else:
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:
name = names[index]
rb = self.create_button(name)
rb.value = mapping[name]
rb.setChecked(name == cur_name)
QtCore.QObject.connect(rb, QtCore.SIGNAL('clicked()'),
self._mapper, QtCore.SLOT('map()'))
self._mapper.setMapping(rb, index)
self.set_tooltip(rb)
layout.addWidget(rb, i, j)
index += incr[j]
n -= 1
#---------------------------------------------------------------------------
# Returns the QAbstractButton used for the radio button:
#---------------------------------------------------------------------------
def create_button(self, name):
""" Returns the QAbstractButton used for the radio button.
"""
label = self.string_value(name, capitalize)
return QtGui.QRadioButton(label)
#-------------------------------------------------------------------------------
# 'ListEditor' class:
#-------------------------------------------------------------------------------
class ListEditor ( BaseEditor ):
""" Enumeration editor, used for the "custom" style, that displays a list
box.
"""
#---------------------------------------------------------------------------
# Finishes initializing the editor by creating the underlying toolkit
# widget:
#---------------------------------------------------------------------------
def init ( self, parent ):
""" Finishes initializing the editor by creating the underlying toolkit
widget.
"""
super( ListEditor, self ).init( parent )
self.control = QtGui.QListWidget()
QtCore.QObject.connect(self.control,
QtCore.SIGNAL('currentTextChanged(QString)'),
self.update_object)
self.rebuild_editor()
self.set_tooltip()
#---------------------------------------------------------------------------
# Handles the user selecting a list box item:
#---------------------------------------------------------------------------
def update_object(self, text):
""" Handles the user selecting a list box item.
"""
value = unicode(text)
try:
value = self.mapping[ value ]
except:
try:
value = self.factory.evaluate( value )
except:
pass
try:
self.value = value
except:
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 externally to the
editor.
"""
control = self.control
try:
value = self.inverse_mapping[self.value]
for row in range(control.count()):
itm = control.item(row)
if itm.text() == value:
control.setCurrentItem(itm)
control.scrollToItem(itm)
break
except:
pass
#---------------------------------------------------------------------------
# Rebuilds the contents of the editor whenever the original factory
# object's 'values' trait changes:
#---------------------------------------------------------------------------
def rebuild_editor ( self ):
""" Rebuilds the contents of the editor whenever the original factory
object's **values** trait changes.
"""
self.control.blockSignals(True)
self.control.clear()
for name in self.names:
self.control.addItem(name)
self.control.blockSignals(False)
self.update_editor()
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