minor clean up.

NodeGraphQt/base/graph.py

@@ -1478,7 +1478,7 @@ def delete_nodes(self, nodes, push_undo=True):
 
     def extract_nodes(self, nodes, push_undo=True, prompt_warning=True):
         """
-        Extract select nodes from it connections.
+        Extract select nodes from its connections.
 
         Args:
             nodes (list[NodeGraphQt.BaseNode]): list of node instances.
@@ -1843,7 +1843,8 @@ def serialize_session(self):
         """
         return self._serialize(self.all_nodes())
 
-    def deserialize_session(self, layout_data):
+    def deserialize_session(self, layout_data, clear_session=True,
+                            clear_undo_stack=True):
         """
         Load node graph session from a dictionary object.
 
@@ -1854,11 +1855,15 @@ def deserialize_session(self, layout_data):
 
         Args:
             layout_data (dict): dictionary object containing a node session.
+            clear_session (bool): clear current session.
+            clear_undo_stack (bool): clear the undo stack.
         """
-        self.clear_session()
+        if clear_session:
+            self.clear_session()
         self._deserialize(layout_data)
         self.clear_selection()
-        self._undo_stack.clear()
+        if clear_undo_stack:
+            self._undo_stack.clear()
 
     def save_session(self, file_path):
         """
@@ -1872,7 +1877,7 @@ def save_session(self, file_path):
         Args:
             file_path (str): path to the saved node layout.
         """
-        serialized_data = self._serialize(self.all_nodes())
+        serialized_data = self.serialize_session()
         file_path = file_path.strip()
 
         def default(obj):
@@ -1906,14 +1911,15 @@ def load_session(self, file_path):
             raise IOError('file does not exist: {}'.format(file_path))
 
         self.clear_session()
-        self.import_session(file_path)
+        self.import_session(file_path, clear_undo_stack=True)
 
-    def import_session(self, file_path):
+    def import_session(self, file_path, clear_undo_stack=True):
         """
-        Import node graph session layout file.
+        Import node graph into the current session.
 
         Args:
             file_path (str): path to the serialized layout file.
+            clear_undo_stack (bool): clear the undo stack after import.
         """
         file_path = file_path.strip()
         if not os.path.isfile(file_path):
@@ -1929,15 +1935,18 @@ def import_session(self, file_path):
         if not layout_data:
             return
 
-        self._deserialize(layout_data)
-        self._undo_stack.clear()
+        self.deserialize_session(
+            layout_data,
+            clear_session=False,
+            clear_undo_stack=clear_undo_stack
+        )
         self._model.session = file_path
 
         self.session_changed.emit(file_path)
 
     def copy_nodes(self, nodes=None):
         """
-        Copy nodes to the clipboard.
+        Copy nodes to the clipboard as a JSON formatted ``str``.
 
         See Also:
             :meth:`NodeGraph.cut_nodes`
@@ -1959,7 +1968,7 @@ def copy_nodes(self, nodes=None):
 
     def cut_nodes(self, nodes=None):
         """
-        Cut nodes to the clipboard.
+        Cut nodes to the clipboard as a JSON formatted ``str``.
 
         Note:
             This function doesn't trigger the
@@ -2245,7 +2254,7 @@ def auto_layout_nodes(self, nodes=None, down_stream=True, start_nodes=None):
     # convenience dialog functions.
     # --------------------------------------------------------------------------
 
-    def question_dialog(self, text, title='Node Graph'):
+    def question_dialog(self, text, title='Node Graph', parent=None):
         """
         Prompts a question open dialog with ``"Yes"`` and ``"No"`` buttons in
         the node graph.
@@ -2257,13 +2266,14 @@ def question_dialog(self, text, title='Node Graph'):
         Args:
             text (str): question text.
             title (str): dialog window title.
+            parent (QtWidgets.QObject): override dialog parent. (optional)
 
         Returns:
             bool: true if user clicked yes.
         """
-        return self._viewer.question_dialog(text, title)
+        return self._viewer.question_dialog(text, title, parent)
 
-    def message_dialog(self, text, title='Node Graph'):
+    def message_dialog(self, text, title='Node Graph', parent=None):
         """
         Prompts a file open dialog in the node graph.
 
@@ -2274,10 +2284,11 @@ def message_dialog(self, text, title='Node Graph'):
         Args:
             text (str): message text.
             title (str): dialog window title.
+            parent (QtWidgets.QObject): override dialog parent. (optional)
         """
-        self._viewer.message_dialog(text, title)
+        self._viewer.message_dialog(text, title, parent)
 
-    def load_dialog(self, current_dir=None, ext=None):
+    def load_dialog(self, current_dir=None, ext=None, parent=None):
         """
         Prompts a file open dialog in the node graph.
 
@@ -2288,13 +2299,14 @@ def load_dialog(self, current_dir=None, ext=None):
         Args:
             current_dir (str): path to a directory.
             ext (str): custom file type extension (default: ``"json"``)
+            parent (QtWidgets.QObject): override dialog parent. (optional)
 
         Returns:
             str: selected file path.
         """
-        return self._viewer.load_dialog(current_dir, ext)
+        return self._viewer.load_dialog(current_dir, ext, parent)
 
-    def save_dialog(self, current_dir=None, ext=None):
+    def save_dialog(self, current_dir=None, ext=None,  parent=None):
         """
         Prompts a file save dialog in the node graph.
 
@@ -2305,11 +2317,12 @@ def save_dialog(self, current_dir=None, ext=None):
         Args:
             current_dir (str): path to a directory.
             ext (str): custom file type extension (default: ``"json"``)
+            parent (QtWidgets.QObject): override dialog parent. (optional)
 
         Returns:
             str: selected file path.
         """
-        return self._viewer.save_dialog(current_dir, ext)
+        return self._viewer.save_dialog(current_dir, ext, parent)
 
     # group node / sub graph.
     # --------------------------------------------------------------------------

NodeGraphQt/pkg_info.py

@@ -1,6 +1,6 @@
 #!/usr/bin/python
 # -*- coding: utf-8 -*-
-__version__ = '0.6.18'
+__version__ = '0.6.19'
 __status__ = 'Work in Progress'
 __license__ = 'MIT'
 

NodeGraphQt/widgets/dialogs.py

@@ -5,7 +5,7 @@
 _current_user_directory = os.path.expanduser('~')
 
 
-def set_dir(file):
+def _set_dir(file):
     global _current_user_directory
     if os.path.isdir(file):
         _current_user_directory = file
@@ -24,7 +24,7 @@ def getSaveFileName(parent=None, title='Save File', file_dir=None,
             parent, title, file_dir, ext_filter)
         file = file_dlg[0] or None
         if file:
-            set_dir(file)
+            _set_dir(file)
         return file_dlg
 
     @staticmethod
@@ -36,23 +36,23 @@ def getOpenFileName(parent=None, title='Open File', file_dir=None,
             parent, title, file_dir, ext_filter)
         file = file_dlg[0] or None
         if file:
-            set_dir(file)
+            _set_dir(file)
         return file_dlg
 
 
 class BaseDialog(object):
 
     @staticmethod
-    def message_dialog(text='', title='Message'):
-        dlg = QtWidgets.QMessageBox()
+    def message_dialog(parent=None, text='', title='Message'):
+        dlg = QtWidgets.QMessageBox(parent=parent)
         dlg.setWindowTitle(title)
         dlg.setInformativeText(text)
         dlg.setStandardButtons(QtWidgets.QMessageBox.Ok)
         dlg.exec_()
 
     @staticmethod
-    def question_dialog(text='', title='Are you sure?'):
-        dlg = QtWidgets.QMessageBox()
+    def question_dialog(parent=None, text='', title='Are you sure?'):
+        dlg = QtWidgets.QMessageBox(parent=parent)
         dlg.setWindowTitle(title)
         dlg.setInformativeText(text)
         dlg.setStandardButtons(

NodeGraphQt/widgets/viewer.py

@@ -1224,70 +1224,82 @@ def context_menus(self):
         """
         return {'graph': self._ctx_graph_menu, 'nodes': self._ctx_node_menu}
 
-    def question_dialog(self, text, title='Node Graph'):
+    def question_dialog(self, text, title='Node Graph', parent=None):
         """
         Prompt node viewer question dialog widget with "yes", "no" buttons.
 
         Args:
             text (str): dialog text.
             title (str): dialog window title.
+            parent (QtWidgets.QObject): override dialog parent. (optional)
 
         Returns:
             bool: true if user click yes.
         """
+        parent = parent or self
+
         self.clear_key_state()
-        return BaseDialog.question_dialog(text, title)
+        return BaseDialog.question_dialog(parent, text, title)
 
-    def message_dialog(self, text, title='Node Graph'):
+    def message_dialog(self, text, title='Node Graph', parent=None):
         """
         Prompt node viewer message dialog widget with "ok" button.
 
         Args:
             text (str): dialog text.
             title (str): dialog window title.
+            parent (QtWidgets.QObject): override dialog parent. (optional)
         """
+        parent = parent or self
+
         self.clear_key_state()
-        BaseDialog.message_dialog(text, title)
+        BaseDialog.message_dialog(parent, text, title)
 
-    def load_dialog(self, current_dir=None, ext=None):
+    def load_dialog(self, current_dir=None, ext=None, parent=None):
         """
         Prompt node viewer file load dialog widget.
 
         Args:
             current_dir (str): directory path starting point. (optional)
             ext (str): custom file extension filter type. (optional)
+            parent (QtWidgets.QObject): override dialog parent. (optional)
 
         Returns:
             str: selected file path.
         """
+        parent = parent or self
+
         self.clear_key_state()
         ext = '*{} '.format(ext) if ext else ''
         ext_filter = ';;'.join([
             'Node Graph ({}*json)'.format(ext), 'All Files (*)'
         ])
         file_dlg = FileDialog.getOpenFileName(
-            self, 'Open File', current_dir, ext_filter)
+            parent, 'Open File', current_dir, ext_filter)
         file = file_dlg[0] or None
         return file
 
-    def save_dialog(self, current_dir=None, ext=None):
+    def save_dialog(self, current_dir=None, ext=None, parent=None):
         """
         Prompt node viewer file save dialog widget.
 
         Args:
             current_dir (str): directory path starting point. (optional)
             ext (str): custom file extension filter type. (optional)
+            parent (QtWidgets.QObject): override dialog parent. (optional)
 
         Returns:
             str: selected file path.
         """
+        parent = parent or self
+
         self.clear_key_state()
         ext_label = '*{} '.format(ext) if ext else ''
         ext_type = '.{}'.format(ext) if ext else '.json'
         ext_map = {'Node Graph ({}*json)'.format(ext_label): ext_type,
                    'All Files (*)': ''}
         file_dlg = FileDialog.getSaveFileName(
-            self, 'Save Session', current_dir, ';;'.join(ext_map.keys()))
+            parent, 'Save Session', current_dir, ';;'.join(ext_map.keys()))
         file_path = file_dlg[0]
         if not file_path:
             return