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# (C) Copyright 2004-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in 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!
""" Defines the array editor factory for all traits toolkit backends.
"""
import numpy
from traits.api import Bool, HasTraits, Int, Float, Instance, TraitError
from traitsui.editor import Editor
from traitsui.editor_factory import EditorFactory
from traitsui.group import Group
from traitsui.item import Item
from traitsui.view import View
class ArrayEditor(EditorFactory):
"""Editor factory for array editors."""
# -------------------------------------------------------------------------
# Trait definitions:
# -------------------------------------------------------------------------
#: Width of the individual fields
width = Int(-80)
#: Is user input set on every keystroke?
auto_set = Bool(True)
#: Is user input set when the Enter key is pressed?
enter_set = Bool(False)
class ArrayStructure(HasTraits):
# -------------------------------------------------------------------------
# Trait definitions:
# -------------------------------------------------------------------------
#: Editor that this structure is linked to
editor = Instance(Editor)
#: The constructed View for the array
view = Instance(View)
def __init__(self, editor):
"""Initializes the object."""
super().__init__(editor=editor)
# Set up the field width for each item:
width = editor.factory.width
# Set up the correct style for each filed:
style = "simple"
if editor.readonly:
style = "readonly"
# Get the array we are mirroring:
object = editor.value
# Determine the correct trait type to use for each element:
trait = Float()
if object.dtype.kind == "i":
trait = Int()
if len(object.shape) == 1:
self.view = self._one_dim_view(object, style, width, trait)
elif len(object.shape) == 2:
self.view = self._two_dim_view(object, style, width, trait)
else:
raise TraitError("Only 1D or 2D arrays supported")
# -------------------------------------------------------------------------
# 1D view:
# -------------------------------------------------------------------------
def _one_dim_view(self, object, style, width, trait):
content = []
shape = object.shape
items = []
format_func = self.editor.factory.format_func
format_str = self.editor.factory.format_str
for i in range(shape[0]):
name = "f%d" % i
self.add_trait(
name,
trait(
object[i],
event="field",
auto_set=self.editor.factory.auto_set,
enter_set=self.editor.factory.enter_set,
),
)
items.append(
Item(
name=name,
style=style,
width=width,
format_func=format_func,
format_str=format_str,
padding=-3,
)
)
group = Group(orientation="horizontal", show_labels=False, *items)
content.append(group)
return View(Group(show_labels=False, *content))
# -------------------------------------------------------------------------
# 2D view:
# -------------------------------------------------------------------------
def _two_dim_view(self, object, style, width, trait):
content = []
shape = object.shape
format_func = self.editor.factory.format_func
format_str = self.editor.factory.format_str
for i in range(shape[0]):
items = []
for j in range(shape[1]):
name = "f%d_%d" % (i, j)
self.add_trait(
name,
trait(
object[i, j],
event="field",
auto_set=self.editor.factory.auto_set,
enter_set=self.editor.factory.enter_set,
),
)
items.append(
Item(
name=name,
style=style,
width=width,
format_func=format_func,
format_str=format_str,
padding=-3,
)
)
group = Group(orientation="horizontal", show_labels=False, *items)
content.append(group)
return View(Group(show_labels=False, *content))
def _field_changed(self):
"""Updates the underlying array when any field changes value."""
if not self.editor._busy:
# Get the array we are mirroring:
object = self.editor.value
shape = object.shape
value = numpy.zeros(shape, object.dtype)
# 1D
if len(shape) == 1:
for i in range(shape[0]):
value[i] = getattr(self, "f%d" % i)
# 2D
elif len(shape) == 2:
for i in range(shape[0]):
for j in range(shape[1]):
value[i, j] = getattr(self, "f%d_%d" % (i, j))
self.editor.update_array(value)
# -------------------------------------------------------------------------
# Toolkit-independent 'SimpleEditor' class:
# -------------------------------------------------------------------------
class SimpleEditor(Editor):
"""Simple style of editor for arrays."""
# -------------------------------------------------------------------------
# Trait definitions:
# -------------------------------------------------------------------------
#: Is the editor read-only?
readonly = Bool(False)
def init(self, parent):
"""Finishes initializing the editor by creating the underlying toolkit
widget.
"""
self._as = _as = ArrayStructure(self)
ui = _as.view.ui(_as, parent, kind="subpanel")
ui.parent = self.ui
self.control = ui.control
def update_editor(self):
"""Updates the editor when the object trait changes externally to the
editor.
"""
if not self._busy:
self._busy = True
object = self.value
shape = object.shape
_as = self._as
# 1D
if len(shape) == 1:
for i in range(shape[0]):
setattr(_as, "f%d" % i, object[i])
# 2D
elif len(shape) == 2:
for i in range(shape[0]):
for j in range(shape[1]):
setattr(_as, "f%d_%d" % (i, j), object[i, j])
self._busy = False
def update_array(self, value):
"""Updates the array value associated with the editor."""
self._busy = True
self.value = value
self._busy = False
# This alias is deprecated and will be removed in TraitsUI 8.
ToolkitEditorFactory = ArrayEditor
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