ENH: collapsible group box

mne/gui/_coreg.py

@@ -1290,10 +1290,17 @@ def _update_fiducials_label(self):
         )
 
     def _configure_dock(self):
+        if self._renderer._kind == 'notebook':
+            collapse = True  # collapsible and collapsed
+        else:
+            collapse = None  # not collapsible
         self._renderer._dock_initialize(
             name="Input", area="left", max_width="350px"
         )
-        mri_subject_layout = self._renderer._dock_add_group_box("MRI Subject")
+        mri_subject_layout = self._renderer._dock_add_group_box(
+            name="MRI Subject",
+            collapse=collapse,
+        )
         self._widgets["subjects_dir"] = self._renderer._dock_add_file_button(
             name="subjects_dir",
             desc="Load",
@@ -1316,7 +1323,8 @@ def _configure_dock(self):
         )
 
         mri_fiducials_layout = self._renderer._dock_add_group_box(
-            "MRI Fiducials"
+            name="MRI Fiducials",
+            collapse=collapse,
         )
         # Add MRI fiducials I/O widgets
         self._widgets['mri_fiducials_label'] = self._renderer._dock_add_label(
@@ -1387,8 +1395,10 @@ def _configure_dock(self):
         self._renderer._layout_add_widget(
             mri_fiducials_layout, fiducial_coords_layout)
 
-        dig_source_layout = \
-            self._renderer._dock_add_group_box("Info source with digitization")
+        dig_source_layout = self._renderer._dock_add_group_box(
+            name="Info source with digitization",
+            collapse=collapse,
+        )
         self._widgets["info_file"] = self._renderer._dock_add_file_button(
             name="info_file",
             desc="Load",
@@ -1431,8 +1441,10 @@ def _configure_dock(self):
         )
         self._renderer._layout_add_widget(dig_source_layout, omit_hsp_layout)
 
-        view_options_layout = \
-            self._renderer._dock_add_group_box("View Options")
+        view_options_layout = self._renderer._dock_add_group_box(
+            name="View Options",
+            collapse=collapse,
+        )
         self._widgets["helmet"] = self._renderer._dock_add_check_box(
             name="Show MEG helmet",
             value=self._helmet,
@@ -1461,8 +1473,10 @@ def _configure_dock(self):
         self._renderer._dock_initialize(
             name="Parameters", area="right", max_width="350px"
         )
-        mri_scaling_layout = \
-            self._renderer._dock_add_group_box(name="MRI Scaling")
+        mri_scaling_layout = self._renderer._dock_add_group_box(
+            name="MRI Scaling",
+            collapse=collapse,
+        )
         self._widgets["scaling_mode"] = self._renderer._dock_add_combo_box(
             name="Scaling Mode",
             value=self._defaults["scale_mode"],
@@ -1529,7 +1543,9 @@ def _configure_dock(self):
         self._renderer._layout_add_widget(
             mri_scaling_layout, subject_to_layout)
         param_layout = self._renderer._dock_add_group_box(
-            "Translation (t) and Rotation (r)")
+            name="Translation (t) and Rotation (r)",
+            collapse=collapse,
+        )
         for coord in coords:
             coord_layout = self._renderer._dock_add_layout(vertical=False)
             for mode, mode_name in (("t", "Translation"), ("r", "Rotation")):
@@ -1571,7 +1587,9 @@ def _configure_dock(self):
         )
         self._renderer._layout_add_widget(param_layout, fit_layout)
         trans_layout = self._renderer._dock_add_group_box(
-            "HEAD <> MRI Transform")
+            name="HEAD <> MRI Transform",
+            collapse=collapse,
+        )
         save_trans_layout = self._renderer._dock_add_layout(vertical=False)
         self._widgets["save_trans"] = self._renderer._dock_add_file_button(
             name="save_trans",
@@ -1602,8 +1620,10 @@ def _configure_dock(self):
         )
         self._renderer._layout_add_widget(trans_layout, save_trans_layout)
 
-        fitting_options_layout = \
-            self._renderer._dock_add_group_box("Fitting Options")
+        fitting_options_layout = self._renderer._dock_add_group_box(
+            name="Fitting Options",
+            collapse=collapse,
+        )
         self._widgets["fit_label"] = self._renderer._dock_add_label(
             value="",
             layout=fitting_options_layout,

mne/gui/tests/test_gui_api.py

@@ -184,7 +184,8 @@ def _check_widget_trigger(widget, mock, before, after, call_count=True,
 
     renderer._dock_initialize(name='', area='right')
     renderer._dock_named_layout(name='')
-    renderer._dock_add_group_box(name='')
+    for collapse in (None, True, False):
+        renderer._dock_add_group_box(name='', collapse=collapse)
     renderer._dock_add_stretch()
     renderer._dock_add_layout()
     renderer._dock_finalize()

mne/viz/backends/_abstract.py

@@ -571,7 +571,7 @@ def _dock_add_radio_buttons(self, value, rng, callback, *, vertical=True,
         pass
 
     @abstractmethod
-    def _dock_add_group_box(self, name, *, layout=None):
+    def _dock_add_group_box(self, name, *, collapse=None, layout=None):
         pass
 
     @abstractmethod

mne/viz/backends/_notebook.py

@@ -9,7 +9,7 @@
 from IPython.display import display
 from ipywidgets import (Button, Dropdown, FloatSlider, BoundedFloatText, HBox,
                         IntSlider, IntText, Text, VBox, IntProgress, Play,
-                        Checkbox, RadioButtons, HTML, jsdlink)
+                        Checkbox, RadioButtons, HTML, Accordion, jsdlink)
 
 from ._abstract import (_AbstractDock, _AbstractToolBar, _AbstractMenuBar,
                         _AbstractStatusBar, _AbstractLayout, _AbstractWidget,
@@ -27,9 +27,13 @@ def _layout_add_widget(self, layout, widget, stretch=0):
         widget.layout.margin = "2px 0px 2px 0px"
         if not isinstance(widget, Play):
             widget.layout.min_width = "0px"
-        children = list(layout.children)
+        if isinstance(layout, Accordion):
+            box = layout.children[0]
+        else:
+            box = layout
+        children = list(box.children)
         children.append(widget)
-        layout.children = tuple(children)
+        box.children = tuple(children)
         # Fix columns
         if self._layout_max_width is not None and isinstance(widget, HBox):
             children = widget.children
@@ -165,9 +169,19 @@ def _dock_add_radio_buttons(self, value, rng, callback, *, vertical=True,
         self._layout_add_widget(layout, widget)
         return _IpyWidgetList(widget)
 
-    def _dock_add_group_box(self, name, *, layout=None):
+    def _dock_add_group_box(self, name, *, collapse=None, layout=None):
         layout = self._dock_layout if layout is None else layout
-        hlayout = VBox()
+        if collapse is None:
+            hlayout = VBox([HTML("<strong>" + name + "</strong>")])
+        else:
+            assert isinstance(collapse, bool)
+            vbox = VBox()
+            hlayout = Accordion([vbox])
+            hlayout.set_title(0, name)
+            if collapse:
+                hlayout.selected_index = None
+            else:
+                hlayout.selected_index = 0
         self._layout_add_widget(layout, hlayout)
         return hlayout
 
@@ -502,14 +516,15 @@ def _update(self):
         if self.figure.display is not None:
             self.figure.display.update_canvas()
 
-    def _create_default_tool_bar(self):
+    def _display_default_tool_bar(self):
         self._tool_bar_load_icons()
         self._tool_bar_initialize()
         self._tool_bar_add_file_button(
             name="screenshot",
             desc="Take a screenshot",
             func=self.screenshot,
         )
+        display(self._tool_bar)
 
     def show(self):
         # menu bar
@@ -519,7 +534,7 @@ def show(self):
         if self._tool_bar is not None:
             display(self._tool_bar)
         else:
-            self._create_default_tool_bar()
+            self._display_default_tool_bar()
         # viewer
         viewer = self.plotter.show(
             jupyter_backend="ipyvtklink", return_viewer=True)

mne/viz/backends/_qt.py

@@ -205,7 +205,7 @@ def func(button):
         self._layout_add_widget(layout, group_layout)
         return _QtWidgetList(group)
 
-    def _dock_add_group_box(self, name, *, layout=None):
+    def _dock_add_group_box(self, name, *, collapse=None, layout=None):
         layout = self._dock_layout if layout is None else layout
         hlayout = QVBoxLayout()
         widget = QGroupBox(name)