#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright © 2018 Michael J. Hayford
""" Table model supporting data content via python eval() fct
.. Created on Wed Mar 14 21:59:43 2018
.. codeauthor: Michael J. Hayford
"""
import logging
from PyQt5.QtCore import Qt, QAbstractTableModel
from PyQt5.QtCore import pyqtSignal
from rayoptics.util.misc_math import isanumber
logger = logging.getLogger(__name__)
[docs]class PyTableModel(QAbstractTableModel):
"""Table model supporting data content via python eval() fct.
Model interface for table view of list structures.
Attributes:
root: object or list at the root of the eval() string
rootEvalStr: string that is concatentated to the root name and
passed to the eval() function. This will accomodate
dynamic name changes.
colEvalStr: string that is concatentated to the root name and
passed to the eval() function. There should be a
replacement field, i.e. {} where the row value will
be substituted using the str.format() function.
rowHeaders: list of strings, length defines number of rows in the
table
colHeaders: list of strings, length defines number of columns in
the table
colFormats: format strings to be used to format data in each column
is_editable: if true, items are editable
get_num_rows: if not None, a function that returns the number of
rows in the table
get_row_headers: if not None, a function that returns the row
headers for the table
"""
update = pyqtSignal(object, int)
def __init__(self, root, rootEvalStr, colEvalStr, rowHeaders,
colHeaders, colFormats, is_editable=False, get_num_rows=None,
get_row_headers=None, drop_actions=None):
"""
"""
super().__init__()
self.root = root
self.rootEvalStr = rootEvalStr
self.colEvalStr = colEvalStr
self.rowHeaders = rowHeaders
self.colHeaders = colHeaders
self.colFormats = colFormats
self.is_editable = is_editable
self.get_num_rows = get_num_rows
self.get_row_headers = get_row_headers
if drop_actions:
self.drop_actions = drop_actions
else:
self.drop_actions = [None]*len(self.colHeaders)
[docs] def rowCount(self, index):
if self.get_num_rows is not None:
return self.get_num_rows()
else:
return len(self.rowHeaders)
[docs] def columnCount(self, index):
return len(self.colHeaders)
[docs] def flags(self, index):
base_flag = Qt.ItemIsEnabled | Qt.ItemIsSelectable
if self.is_editable:
return base_flag | Qt.ItemIsEditable
else:
return base_flag
[docs] def get_root_object(self):
if len(self.rootEvalStr) == 0:
return self.root
else:
root_eval_str = ('self.root' + self.rootEvalStr)
try:
root = eval(root_eval_str)
return root
except IndexError:
return self.root
[docs] def data(self, index, role):
root = self.get_root_object()
if role == Qt.DisplayRole or role == Qt.EditRole:
r = index.row()
c = index.column()
eval_str = ('root' + self.colEvalStr[c]).format(r)
try:
val = eval(eval_str)
valStr = self.colFormats[c].format(val)
return valStr
except IndexError:
return ''
except TypeError:
print('Data type error: ', eval_str, val)
return ''
else:
return None
[docs] def setData(self, index, value, role):
root = self.get_root_object()
if role == Qt.EditRole:
r = index.row()
c = index.column()
exec_str = ('root' + self.colEvalStr[c]).format(r)
if not isanumber(value):
value = "'" + value + "'"
exec_str = exec_str + '=' + value
try:
exec(exec_str)
self.update.emit(root, r)
return True
except IndexError:
return False
except SyntaxError:
logger.info('Syntax error: "%s"', value)
return False
else:
return False