Tree View Node: implement recursive fold and unfold

src/gui/widgets/tree_view_node.cpp

@@ -229,24 +229,36 @@ bool ttree_view_node::is_folded() const
 	return !unfolded_;
 }
 
-void ttree_view_node::fold(/*const bool recursive*/)
+void ttree_view_node::fold(const bool recursive)
 {
 	if(!is_folded()) {
 		fold_internal();
 		if(toggle_) {
 			toggle_->set_value(false);
 		}
 	}
+
+	if(recursive) {
+		for(auto& child_node : children_) {
+			child_node.fold(true);
+		}
+	}
 }
 
-void ttree_view_node::unfold(/*const texpand_mode mode*/)
+void ttree_view_node::unfold(const bool recursive)
 {
 	if(is_folded()) {
 		unfold_internal();
 		if(toggle_) {
 			toggle_->set_value(true);
 		}
 	}
+
+	if(recursive) {
+		for(auto& child_node : children_) {
+			child_node.unfold(true);
+		}
+	}
 }
 
 void ttree_view_node::fold_internal()

src/gui/widgets/tree_view_node.hpp

@@ -117,19 +117,16 @@ class ttree_view_node : public twidget
 	bool is_folded() const;
 
 #if 0
-	enum texpand_mode
-	{
-		  recursive_restore // recursively restores collapse mode
-		, recursive_expand // recursively expands the children
-		, not_recursive
+	// TODO: implement if different expand modes become necessary
+	enum texpand_mode {
+		recursive_restore, // recursively restores collapse mode
+		recursive_expand, // recursively expands the children
+		not_recursive
 	};
 #endif
 
-	// If recursive all children will be closed recursively causing
-	// restore expaning not to expand anything
-	// TODO: ^ implement
-	void fold(/*const bool recursive*/);
-	void unfold(/*const texpand_mode mode*/);
+	void fold(const bool recursive = false);
+	void unfold(const bool recursive = false);
 
 	/**
 	 * See @ref twidget::create_walker.
@@ -141,6 +138,11 @@ class ttree_view_node : public twidget
 		return new gui2::iterator::ttree_node(*this, children_);
 	}
 
+	boost::ptr_vector<ttree_view_node>& children()
+	{
+		return children_;
+	}
+
 	/** See @ref twidget::find_at. */
 	virtual twidget* find_at(const tpoint& coordinate,
 							 const bool must_be_active) override;