LoadModel: Use RecentPathsWComboMixin

Author: janezd

Orange/widgets/model/owloadmodel.py

@@ -1,36 +1,29 @@
 import os
 import pickle
 
+from AnyQt.QtWidgets import QSizePolicy, QStyle, QFileDialog
 from AnyQt.QtCore import QTimer
-from AnyQt.QtWidgets import (
-    QSizePolicy, QHBoxLayout, QComboBox, QStyle, QFileDialog
-)
 
 from Orange.base import Model
 from Orange.widgets import widget, gui
 from Orange.widgets.model import owsavemodel
-from Orange.widgets.settings import Setting
+from Orange.widgets.utils.filedialogs import RecentPathsWComboMixin
 from Orange.widgets.utils import stdpaths
 from Orange.widgets.utils.widgetpreview import WidgetPreview
 from Orange.widgets.widget import Msg, Output
 
 
-class OWLoadModel(widget.OWWidget):
+class OWLoadModel(widget.OWWidget, RecentPathsWComboMixin):
     name = "Load Model"
     description = "Load a model from an input file."
     priority = 3050
     replaces = ["Orange.widgets.classify.owloadclassifier.OWLoadClassifier"]
     icon = "icons/LoadModel.svg"
-    keywords = ["file", "open"]
+    keywords = ["file", "open", "model"]
 
     class Outputs:
         model = Output("Model", Model)
 
-    #: List of recent filenames.
-    history = Setting([])
-    #: Current (last selected) filename or None.
-    filename = Setting(None)
-
     class Error(widget.OWWidget.Error):
         load_error = Msg("An error occured while reading '{}'")
 
@@ -41,96 +34,58 @@ class Error(widget.OWWidget.Error):
 
     def __init__(self):
         super().__init__()
-        self.selectedIndex = -1
-
-        box = gui.widgetBox(
-            self.controlArea, self.tr("File"), orientation=QHBoxLayout()
-        )
+        RecentPathsWComboMixin.__init__(self)
+        self.loaded_file = ""
 
-        self.filesCB = gui.comboBox(
-            box, self, "selectedIndex", callback=self._on_recent)
-        self.filesCB.setMinimumContentsLength(20)
-        self.filesCB.setSizeAdjustPolicy(
-            QComboBox.AdjustToMinimumContentsLength)
+        vbox = gui.vBox(self.controlArea, "File", addSpace=True)
+        box = gui.hBox(vbox)
+        self.file_combo.setMinimumWidth(300)
+        box.layout().addWidget(self.file_combo)
+        self.file_combo.activated[int].connect(self.select_file)
 
-        self.loadbutton = gui.button(box, self, "...", callback=self.browse)
-        self.loadbutton.setIcon(
-            self.style().standardIcon(QStyle.SP_DirOpenIcon))
-        self.loadbutton.setSizePolicy(QSizePolicy.Maximum, QSizePolicy.Fixed)
+        button = gui.button(box, self, '...', callback=self.browse_file)
+        button.setIcon(self.style().standardIcon(QStyle.SP_DirOpenIcon))
+        button.setSizePolicy(
+            QSizePolicy.Maximum, QSizePolicy.Fixed)
 
-        self.reloadbutton = gui.button(
+        button = gui.button(
             box, self, "Reload", callback=self.reload, default=True)
-        self.reloadbutton.setIcon(
-            self.style().standardIcon(QStyle.SP_BrowserReload))
-        self.reloadbutton.setSizePolicy(QSizePolicy.Maximum,
-                                        QSizePolicy.Fixed)
-
-        # filter valid existing filenames
-        self.history = list(filter(os.path.isfile, self.history))[:20]
-        for filename in self.history:
-            self.filesCB.addItem(os.path.basename(filename), userData=filename)
-
-        # restore the current selection if the filename is
-        # in the history list
-        if self.filename in self.history:
-            self.selectedIndex = self.history.index(self.filename)
-        else:
-            self.selectedIndex = -1
-            self.filename = None
-            self.reloadbutton.setEnabled(False)
+        button.setIcon(self.style().standardIcon(QStyle.SP_BrowserReload))
+        button.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)
 
-        if self.filename:
-            QTimer.singleShot(0, lambda: self.load(self.filename))
-
-    def browse(self):
-        """Select a filename using an open file dialog."""
-        if self.filename is None:
-            startdir = stdpaths.Documents
-        else:
-            startdir = os.path.dirname(self.filename)
+        self.set_file_list()
+        QTimer.singleShot(0, self.open_file)
 
+    def browse_file(self):
+        start_file = self.last_path() or stdpaths.Documents
         filename, _ = QFileDialog.getOpenFileName(
-            self, self.tr("Open"), directory=startdir, filter=self.FILTER)
+            self, 'Open Distance File', start_file, self.FILTER)
+        if not filename:
+            return
+        self.add_path(filename)
+        self.open_file()
 
-        if filename:
-            self.load(filename)
+    def select_file(self, n):
+        super().select_file(n)
+        self.open_file()
 
     def reload(self):
-        """Reload the current file."""
-        self.load(self.filename)
+        self.open_file()
 
-    def load(self, filename):
-        """Load the object from filename and send it to output."""
+    def open_file(self):
+        self.clear_messages()
+        fn = self.last_path()
+        if not fn:
+            return
         try:
-            with open(filename, "rb") as f:
+            with open(fn, "rb") as f:
                 model = pickle.load(f)
         except (pickle.UnpicklingError, OSError, EOFError):
-            self.Error.load_error(os.path.split(filename)[-1])
+            self.Error.load_error(os.path.split(fn)[-1])
+            self.Outputs.model.send(None)
         else:
-            self.Error.load_error.clear()
-            self._remember(filename)
             self.Outputs.model.send(model)
 
-    def _remember(self, filename):
-        """
-        Remember `filename` was accessed.
-        """
-        if filename in self.history:
-            index = self.history.index(filename)
-            del self.history[index]
-            self.filesCB.removeItem(index)
-
-        self.history.insert(0, filename)
-
-        self.filesCB.insertItem(0, os.path.basename(filename),
-                                userData=filename)
-        self.selectedIndex = 0
-        self.filename = filename
-        self.reloadbutton.setEnabled(self.selectedIndex != -1)
-
-    def _on_recent(self):
-        self.load(self.history[self.selectedIndex])
-
 
 if __name__ == "__main__":  # pragma: no cover
     WidgetPreview(OWLoadModel).run()

Orange/widgets/model/tests/test_owloadmodel.py

@@ -2,33 +2,139 @@
 # pylint: disable=missing-docstring
 import os
 import pickle
-from tempfile import mkstemp
+from tempfile import NamedTemporaryFile
+import unittest
+from unittest.mock import Mock, patch
 
-from Orange.classification.majority import ConstantModel
+import numpy as np
+
+from orangewidget.utils.filedialogs import RecentPath
+from Orange.data import Table
+from Orange.classification.naive_bayes import NaiveBayesLearner
 from Orange.widgets.model.owloadmodel import OWLoadModel
 from Orange.widgets.tests.base import WidgetTest
 
 
 class TestOWLoadModel(WidgetTest):
+    # Attribute used to store event data so it does not get garbage
+    # collected before event is processed.
+    event_data = None
+
     def setUp(self):
-        self.widget = self.create_widget(OWLoadModel)
+        self.widget = self.create_widget(OWLoadModel)  # type: OWLoadModel
+        data = Table("iris")
+        self.model = NaiveBayesLearner()(data)
+        with NamedTemporaryFile(suffix=".pkcls", delete=False) as f:
+            self.filename = f.name
+            pickle.dump(self.model, f)
+
+    def tearDown(self):
+        os.remove(self.filename)
+
+    def test_browse_file_opens_file(self):
+        w = self.widget
+        with patch("AnyQt.QtWidgets.QFileDialog.getOpenFileName",
+                   Mock(return_value=(self.filename, "*.pkcls"))):
+            w.browse_file()
+            model = self.get_output(w.Outputs.model)
+            np.testing.assert_equal(
+                model.log_cont_prob, self.model.log_cont_prob)
+
+        with patch("AnyQt.QtWidgets.QFileDialog.getOpenFileName",
+                   Mock(return_value=("", "*.pkcls"))):
+            w.browse_file()
+            # Keep the same model on output
+            model2 = self.get_output(w.Outputs.model)
+            self.assertIs(model2, model)
+
+        with patch("AnyQt.QtWidgets.QFileDialog.getOpenFileName",
+                   Mock(return_value=(self.filename, "*.pkcls"))):
+            w.reload()
+            model2 = self.get_output(w.Outputs.model)
+            self.assertIsNot(model2, model)
+
+    @patch("pickle.load")
+    def test_select_file(self, load):
+        w = self.widget
+        with NamedTemporaryFile(suffix=".pkcls") as f2, \
+                NamedTemporaryFile(suffix=".pkcls", delete=False) as f3:
+            w.add_path(self.filename)
+            w.add_path(f2.name)
+            w.add_path(f3.name)
+            w.open_file()
+            args = load.call_args[0][0]
+            self.assertEqual(args.name, f3.name)
+            w.select_file(2)
+            args = load.call_args[0][0]
+            self.assertEqual(args.name, self.filename.replace("\\", "/"))
 
-    def test_show_error(self):
-        self.widget.load("no-such-file.pckls")
-        self.assertTrue(self.widget.Error.load_error.is_shown())
+    def test_load_error(self):
+        w = self.widget
+        with patch("AnyQt.QtWidgets.QFileDialog.getOpenFileName",
+                   Mock(return_value=(self.filename, "*.pkcls"))):
+            with patch("pickle.load", side_effect=pickle.UnpicklingError):
+                w.browse_file()
+                self.assertTrue(w.Error.load_error.is_shown())
+                self.assertIsNone(self.get_output(w.Outputs.model))
 
-        clsf = ConstantModel([1, 1, 1])
-        fd, fname = mkstemp(suffix='.pkcls')
-        os.close(fd)
+            w.reload()
+            self.assertFalse(w.Error.load_error.is_shown())
+            model = self.get_output(w.Outputs.model)
+            self.assertIsNotNone(model)
+
+            with patch.object(w, "last_path", Mock(return_value="")), \
+                    patch("pickle.load") as load:
+                w.reload()
+                load.assert_not_called()
+                self.assertFalse(w.Error.load_error.is_shown())
+                self.assertIs(self.get_output(w.Outputs.model), model)
+
+            with patch("pickle.load", side_effect=pickle.UnpicklingError):
+                w.reload()
+                self.assertTrue(w.Error.load_error.is_shown())
+                self.assertIsNone(self.get_output(w.Outputs.model))
+
+        with patch("AnyQt.QtWidgets.QFileDialog.getOpenFileName",
+                   Mock(return_value=("foo", "*.pkcls"))):
+            w.browse_file()
+            self.assertTrue(w.Error.load_error.is_shown())
+            self.assertIsNone(self.get_output(w.Outputs.model))
+
+    def test_no_last_path(self):
+        self.widget = \
+            self.create_widget(OWLoadModel,
+                               stored_settings={"recent_paths": []})
+        # Doesn't crash and contains a single item, (none).
+        self.assertEqual(self.widget.file_combo.count(), 1)
+
+    @patch("Orange.widgets.widget.OWWidget.workflowEnv",
+           Mock(return_value={"basedir": os.getcwd()}))
+    @patch("pickle.load")
+    def test_open_moved_workflow(self, load):
+        """
+        Test opening workflow that has been moved to another location
+        (i.e. sent by email), considering data file is stored in the same
+        directory as the workflow.
+        """
+        temp_file = NamedTemporaryFile(dir=os.getcwd(), delete=False)
+        file_name = temp_file.name
+        temp_file.close()
+        base_name = os.path.basename(file_name)
         try:
-            with open(fname, 'wb') as f:
-                pickle.dump(clsf, f)
-            self.widget.load(fname)
-            self.assertFalse(self.widget.Error.load_error.is_shown())
-
-            with open(fname, "w") as f:
-                f.write("X")
-            self.widget.load(fname)
-            self.assertTrue(self.widget.Error.load_error.is_shown())
+            recent_path = RecentPath(
+                os.path.join("temp/models", base_name), "",
+                os.path.join("models", base_name)
+            )
+            stored_settings = {"recent_paths": [recent_path]}
+            w = self.create_widget(OWLoadModel,
+                                   stored_settings=stored_settings)
+            w.open_file()
+            self.assertEqual(w.file_combo.count(), 1)
+            args = load.call_args[0][0]
+            self.assertEqual(args.name, file_name.replace("\\", "/"))
         finally:
-            os.remove(fname)
+            os.remove(file_name)
+
+
+if __name__ == "__main__":
+    unittest.main()

doc/widgets.json

@@ -572,7 +572,8 @@
     "background": "#FAC1D9",
     "keywords": [
      "file",
-     "open"
+     "open",
+     "model"
     ]
    }
   ]