Added settingsAboutToBePacked signal to OWWidget

Orange/widgets/data/owpythonscript.py

@@ -21,7 +21,7 @@
 from Orange.base import Learner, Model
 from Orange.widgets import widget, gui
 from Orange.widgets.utils import itemmodels
-from Orange.widgets.settings import Setting, SettingsHandler
+from Orange.widgets.settings import Setting
 from Orange.widgets.utils.widgetpreview import WidgetPreview
 from Orange.widgets.widget import OWWidget, Input, Output
 
@@ -364,14 +364,6 @@ def select_row(view, row):
                     QItemSelectionModel.ClearAndSelect)
 
 
-class PrepareSavingSettingsHandler(SettingsHandler):
-    """Calls storeSpecificSettings, which is currently not called from non-context handlers."""
-
-    def pack_data(self, widget):
-        widget.storeSpecificSettings()
-        return super().pack_data(widget)
-
-
 class OWPythonScript(widget.OWWidget):
     name = "Python Script"
     description = "Write a Python script and run it on input data or models."
@@ -397,8 +389,6 @@ class Outputs:
 
     signal_names = ("data", "learner", "classifier", "object")
 
-    settingsHandler = PrepareSavingSettingsHandler()
-
     libraryListSource = \
         Setting([Script("Hello world", "print('Hello world')\n")])
     currentScriptIndex = Setting(0)
@@ -528,6 +518,7 @@ def __init__(self):
         select_row(self.libraryView, self.currentScriptIndex)
 
         self.restoreScriptText()
+        self.settingsAboutToBePacked.connect(self.saveScriptText)
 
         self.splitCanvas.setSizes([2, 1])
         if self.splitterState is not None:
@@ -537,9 +528,6 @@ def __init__(self):
         self.controlArea.layout().addStretch(1)
         self.resize(800, 600)
 
-    def storeSpecificSettings(self):
-        self.saveScriptText()
-
     def restoreScriptText(self):
         if self.scriptText is not None:
             current = self.text.toPlainText()

Orange/widgets/settings.py

@@ -489,6 +489,12 @@ def _add_defaults(self, data):
         new_data.update(data)
         return new_data
 
+    def _prepare_defaults(self, widget):
+        self.defaults = self.provider.pack(widget)
+        for setting, data, _ in self.provider.traverse_settings(data=self.defaults):
+            if setting.schema_only:
+                data.pop(setting.name, None)
+
     def pack_data(self, widget):
         """
         Pack the settings for the given widget. This method is used when
@@ -504,6 +510,7 @@ def pack_data(self, widget):
         ----------
         widget : OWWidget
         """
+        widget.settingsAboutToBePacked.emit()
         packed_settings = self.provider.pack(widget)
         packed_settings[VERSION_KEY] = self.widget_class.settings_version
         return packed_settings
@@ -517,10 +524,8 @@ def update_defaults(self, widget):
         ----------
         widget : OWWidget
         """
-        self.defaults = self.provider.pack(widget)
-        for setting, data, _ in self.provider.traverse_settings(data=self.defaults):
-            if setting.schema_only:
-                data.pop(setting.name, None)
+        widget.settingsAboutToBePacked.emit()
+        self._prepare_defaults(widget)
         self.write_defaults()
 
     def fast_save(self, widget, name, value):
@@ -675,6 +680,7 @@ def update_defaults(self, widget):
         Merge the widgets local contexts into the global contexts and persist
         the settings (including the contexts) to disk.
         """
+        widget.settingsAboutToBePacked.emit()
         self.settings_from_widget(widget)
         globs = self.global_contexts
         assert widget.context_settings is not globs
@@ -683,7 +689,10 @@ def update_defaults(self, widget):
         globs.sort(key=lambda c: -c.time)
         del globs[self.MAX_SAVED_CONTEXTS:]
 
-        super().update_defaults(widget)
+        # Save non-context settings. Do not call super().update_defaults, so that
+        # settingsAboutToBePacked is emitted once.
+        self._prepare_defaults(widget)
+        self.write_defaults()
 
     def new_context(self, *args):
         """Create a new context."""

Orange/widgets/tests/test_context_handler.py

@@ -3,6 +3,7 @@
 from io import BytesIO
 from unittest import TestCase
 from unittest.mock import Mock, patch, call
+from AnyQt.QtCore import pyqtSignal as Signal, QObject
 from Orange.widgets.settings import (
     ContextHandler, ContextSetting, Context, Setting, SettingsPrinter,
     VERSION_KEY, IncompatibleContext
@@ -11,13 +12,14 @@
 __author__ = 'anze'
 
 
-class SimpleWidget:
+class SimpleWidget(QObject):
     settings_version = 1
 
     setting = Setting(42)
     schema_only_setting = Setting(None, schema_only=True)
 
     context_setting = ContextSetting(42)
+    settingsAboutToBePacked = Signal()
 
     migrate_settings = Mock()
     migrate_context = Mock()
@@ -213,6 +215,18 @@ def test_close_context(self):
         handler.close_context(widget)
         self.assertEqual(widget.schema_only_setting, 0xD06F00D)
 
+    def test_about_pack_settings_signal(self):
+        handler = ContextHandler()
+        handler.bind(SimpleWidget)
+        widget = SimpleWidget()
+        handler.initialize(widget)
+        fn = Mock()
+        widget.settingsAboutToBePacked.connect(fn)
+        handler.pack_data(widget)
+        self.assertEqual(1, fn.call_count)
+        handler.update_defaults(widget)
+        self.assertEqual(2, fn.call_count)
+
 
 class TestSettingsPrinter(TestCase):
     def test_formats_contexts(self):

Orange/widgets/tests/test_settings_handler.py

@@ -8,6 +8,8 @@
 from unittest.mock import patch, Mock
 import warnings
 
+from AnyQt.QtCore import pyqtSignal as Signal, QObject
+
 from Orange.tests import named_file
 from Orange.widgets.settings import SettingsHandler, Setting, SettingProvider,\
     VERSION_KEY, rename_setting, Context, migrate_str_to_variable
@@ -342,13 +344,25 @@ def override_default_settings(self, widget, defaults=None):
         if os.path.isfile(filename):
             os.remove(filename)
 
+    def test_about_pack_settings_signal(self):
+        handler = SettingsHandler()
+        handler.bind(SimpleWidget)
+        widget = SimpleWidget()
+        handler.initialize(widget)
+        fn = Mock()
+        widget.settingsAboutToBePacked.connect(fn)
+        handler.pack_data(widget)
+        self.assertEqual(1, fn.call_count)
+        handler.update_defaults(widget)
+        self.assertEqual(2, fn.call_count)
+
 
 class Component:
     int_setting = Setting(42)
     schema_only_setting = Setting("only", schema_only=True)
 
 
-class SimpleWidget:
+class SimpleWidget(QObject):
     settings_version = 1
 
     setting = Setting(42)
@@ -357,8 +371,10 @@ class SimpleWidget:
     non_setting = 5
 
     component = SettingProvider(Component)
+    settingsAboutToBePacked = Signal()
 
     def __init__(self):
+        super().__init__()
         self.component = Component()
 
     migrate_settings = Mock()

Orange/widgets/widget.py

@@ -177,6 +177,7 @@ class OWWidget(QDialog, OWComponent, Report, ProgressBarMixin,
     #: :type: list of :class:`Message`
     UserAdviceMessages = []
 
+    settingsAboutToBePacked = Signal()
     contextAboutToBeOpened = Signal(object)
     contextOpened = Signal()
     contextClosed = Signal()