[collapsible_headings] add optional collapse/uncollapse-all button

Author: jcb91

src/jupyter_contrib_nbextensions/nbextensions/collapsible_headings/collapsible_headings.yaml

@@ -10,6 +10,10 @@ Parameters:
   description: Add a toolbar button to collapse the closest header cell
   input_type: checkbox
   default: false
+- name: collapsible_headings.add_all_cells_button
+  description: Add a toolbar button to collapse/uncollapse all header cells
+  input_type: checkbox
+  default: false
 - name: collapsible_headings.add_insert_header_buttons
   description: Add toolbar buttons to insert heading cells above/below the selected cell
   input_type: checkbox

src/jupyter_contrib_nbextensions/nbextensions/collapsible_headings/main.js

@@ -15,6 +15,7 @@ define(['jquery', 'require'], function ($, require) {
 	// define default values for config parameters
 	var params = {
 		add_button : false,
+		add_all_cells_button: false,
 		add_insert_header_buttons: false,
 		use_toggle_controls : true,
 		make_toggle_controls_buttons : false,
@@ -844,6 +845,25 @@ define(['jquery', 'require'], function ($, require) {
 				}
 			}]);
 		}
+		if (params.add_all_cells_button) {
+			Jupyter.toolbar.add_buttons_group([{
+				label: 'toggle all headings',
+				icon: 'fa-angle-double-up',
+				callback: function () {
+					/**
+					 * Collapse/uncollapse all heading cells based on status of first
+					 */
+					var cells = Jupyter.notebook.get_cells();
+					for (var ii = 0; ii < cells.length; ii++) {
+						if (is_heading(cells[ii])) {
+							Jupyter.keyboard_manager.actions.call(action_names[
+								is_collapsed_heading(cells[ii]) ? 'uncollapse_all' : 'collapse_all']);
+							return;
+						}
+					}
+				}
+			}]);
+		}
 		if (params.add_insert_header_buttons) {
 			Jupyter.toolbar.add_buttons_group([
 				action_names.insert_above, action_names.insert_below

src/jupyter_contrib_nbextensions/nbextensions/collapsible_headings/readme.md

@@ -40,6 +40,7 @@ the nbextensions config page:
   indicating hidden content (disabled by default)
 * A toolbar button to collapse the nearest heading to the curently selected
   cell (disabled by default)
+* A toolbar button to collapse/uncollapse all headings (disabled by default)
 
 
 css