fixed LArrayDataAdapter.get_xlabels being slow on large 1D arrays (issue #93)

Author: gdementen

larray_editor/arrayadapter.py

@@ -51,7 +51,9 @@ def get_xlabels(self):
         if self.filtered_data.size == 0 or len(axes) == 0:
             return None
         else:
-            return [[label] for label in axes.labels[-1]]
+            # this is a lazy equivalent of:
+            # return [(label,) for label in axes.labels[-1]]
+            return Product([axes.labels[-1]])
 
     def get_ylabels(self):
         axes = self.filtered_data.axes

larray_editor/arraymodel.py

@@ -2,7 +2,8 @@
 
 import numpy as np
 from larray_editor.utils import (get_font, from_qvariant, to_qvariant, to_text_string,
-                                 is_float, is_number, LinearGradient, SUPPORTED_FORMATS, scale_to_01range)
+                                 is_float, is_number, LinearGradient, SUPPORTED_FORMATS, scale_to_01range,
+                                 Product)
 from qtpy.QtCore import Qt, QModelIndex, QAbstractTableModel
 from qtpy.QtGui import QColor
 from qtpy.QtWidgets import QMessageBox
@@ -132,8 +133,9 @@ def __init__(self, parent=None, data=None, readonly=False, font=None):
     def _set_data(self, data, changes=None):
         if data is None:
             data = [[]]
-        if not isinstance(data, (list, tuple)):
-            QMessageBox.critical(self.dialog, "Error", "Expected list or tuple.")
+        # TODO: use sequence instead
+        if not isinstance(data, (list, tuple, Product)):
+            QMessageBox.critical(self.dialog, "Error", "Expected list, tuple or Product")
             data = [[]]
         self._data = data
         self.total_rows = len(data[0])