LibGUI: Add TreeView::expand_all_parents_of(ModelIndex)

This does exactly what it sounds like. :^)

2 files changed, 19 insertions, 0 deletions

diff --git a/Libraries/LibGUI/TreeView.cpp b/Libraries/LibGUI/TreeView.cpp
index 028b478ed3..fc79ba0742 100644
--- a/Libraries/LibGUI/TreeView.cpp
+++ b/Libraries/LibGUI/TreeView.cpp
@@ -125,6 +125,23 @@ void TreeView::set_open_state_of_all_in_subtree(const ModelIndex& root, bool ope
     }
 }
 
+void TreeView::expand_all_parents_of(const ModelIndex& index)
+{
+    if (!model())
+        return;
+
+    auto current = index;
+    while (current.is_valid()) {
+        ensure_metadata_for_index(current).open = true;
+        if (on_toggle)
+            on_toggle(current, true);
+        current = current.parent();
+    }
+    update_column_sizes();
+    update_content_size();
+    update();
+}
+
 void TreeView::expand_tree(const ModelIndex& root)
 {
     if (!model())
diff --git a/Libraries/LibGUI/TreeView.h b/Libraries/LibGUI/TreeView.h
index 3b3f049370..d8e81dc431 100644
--- a/Libraries/LibGUI/TreeView.h
+++ b/Libraries/LibGUI/TreeView.h
@@ -44,6 +44,8 @@ public:
     void expand_tree(const ModelIndex& root = {});
     void collapse_tree(const ModelIndex& root = {});
 
+    void expand_all_parents_of(const ModelIndex&);
+
     Function<void(const ModelIndex&, const bool)> on_toggle;
 
 protected: