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# (C) Copyright 2005-2023 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!
import logging
from pyface.data_view.data_view_errors import (
DataViewGetError, DataViewSetError
)
from pyface.data_view.index_manager import Root
from wx.dataview import DataViewItem, DataViewModel as wxDataViewModel
logger = logging.getLogger(__name__)
# XXX This file is scaffolding and may need to be rewritten or expanded
class DataViewModel(wxDataViewModel):
""" A wxDataViewModel that understands AbstractDataModels. """
def __init__(self, model):
super().__init__()
self.model = model
@property
def model(self):
return self._model
@model.setter
def model(self, model):
if hasattr(self, '_model'):
# disconnect trait listeners
self._model.observe(
self.on_structure_changed,
'structure_changed',
dispatch='ui',
remove=True,
)
self._model.observe(
self.on_values_changed,
'values_changed',
dispatch='ui',
remove=True,
)
self._model = model
else:
# model is being initialized
self._model = model
# hook up trait listeners
self._model.observe(
self.on_structure_changed,
'structure_changed',
dispatch='ui',
)
self._model.observe(
self.on_values_changed,
'values_changed',
dispatch='ui',
)
def on_structure_changed(self, event):
self.Cleared()
def on_values_changed(self, event):
top, left, bottom, right = event.new
if top == () and bottom == ():
# this is a column header change, reset everything
self.Cleared()
elif left == () and right == ():
# this is a row header change
# XXX this is currently not supported and not needed
pass
else:
for i, (top_row, bottom_row) in enumerate(zip(top, bottom)):
if top_row != bottom_row:
break
top = top[:i+1]
bottom = bottom[:i+1]
if top == bottom and left == right:
# single value change
self.ValueChanged(self._to_item(top), left[0])
elif top == bottom:
# single item change
self.ItemChanged(self._to_item(top))
else:
# multiple item change
items = [
self._to_item(top[:i] + [row])
for row in range(top[i], bottom[i]+1)
]
self.ItemsChanged(items)
def GetParent(self, item):
index = self._to_index(item)
if index == Root:
return DataViewItem()
parent, row = self.model.index_manager.get_parent_and_row(index)
parent_id = self.model.index_manager.id(parent)
if parent_id == 0:
return DataViewItem()
return DataViewItem(parent_id)
def GetChildren(self, item, children):
index = self._to_index(item)
row_index = self.model.index_manager.to_sequence(index)
n_children = self.model.get_row_count(row_index)
for i in range(n_children):
child_index = self.model.index_manager.create_index(index, i)
child_id = self.model.index_manager.id(child_index)
children.append(DataViewItem(child_id))
return n_children
def IsContainer(self, item):
row_index = self._to_row_index(item)
return self.model.can_have_children(row_index)
def HasValue(self, item, column):
return True
def HasChildren(self, item):
row_index = self._to_row_index(item)
return self.model.has_child_rows(row_index)
def GetValue(self, item, column):
row_index = self._to_row_index(item)
if column == 0:
column_index = ()
else:
column_index = (column - 1,)
value_type = self.model.get_value_type(row_index, column_index)
try:
if value_type.has_text(self.model, row_index, column_index):
return value_type.get_text(self.model, row_index, column_index)
except DataViewGetError:
return ''
except Exception:
# unexpected error, log and raise
logger.exception(
"get data failed: row %r, column %r",
row_index,
column_index,
)
raise
return ''
def SetValue(self, value, item, column):
row_index = self._to_row_index(item)
if column == 0:
column_index = ()
else:
column_index = (column - 1,)
try:
value_type = self.model.get_value_type(row_index, column_index)
value_type.set_text(self.model, row_index, column_index, value)
except DataViewSetError:
return False
except Exception:
logger.exception(
"SetValue failed: row %r, column %r, value %r",
row_index,
column_index,
value,
)
return False
else:
return True
def GetColumnCount(self):
return self.model.get_column_count() + 1
def GetColumnType(self, column):
# XXX This may need refinement when we deal with different editor types
return "string"
def _to_row_index(self, item):
id = item.GetID()
if id is None:
id = 0
index = self.model.index_manager.from_id(int(id))
return self.model.index_manager.to_sequence(index)
def _to_item(self, row_index):
if len(row_index) == 0:
return DataViewItem()
index = self.model.index_manager.from_sequence(row_index)
id = self.model.index_manager.id(index)
return DataViewItem(id)
def _to_index(self, item):
id = item.GetID()
if id is None:
id = 0
return self.model.index_manager.from_id(int(id))
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