From 285a4165f39078db5d52645c2dc5d0861c4f38ac Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sat, 6 Jun 2020 15:07:07 +0200
Subject: [PATCH] LibWeb: Add Node notifications for Document<=>Frame
 attach/detach

Some DOM nodes will want to do stuff when we attach/detach from a Frame
and this seems like a simple enough way to let them know.
---
 Libraries/LibWeb/DOM/Document.cpp | 10 +++++++++-
 Libraries/LibWeb/DOM/Node.h       |  3 +++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Libraries/LibWeb/DOM/Document.cpp b/Libraries/LibWeb/DOM/Document.cpp
index 529be4f88e..74e979c350 100644
--- a/Libraries/LibWeb/DOM/Document.cpp
+++ b/Libraries/LibWeb/DOM/Document.cpp
@@ -161,11 +161,19 @@ String Document::title() const
 void Document::attach_to_frame(Badge<Frame>, Frame& frame)
 {
     m_frame = frame.make_weak_ptr();
+    for_each_in_subtree([&](auto& node) {
+        node.document_did_attach_to_frame(frame);
+        return IterationDecision::Continue;
+    });
     layout();
 }
 
-void Document::detach_from_frame(Badge<Frame>, Frame&)
+void Document::detach_from_frame(Badge<Frame>, Frame& frame)
 {
+    for_each_in_subtree([&](auto& node) {
+        node.document_will_detach_from_frame(frame);
+        return IterationDecision::Continue;
+    });
     m_layout_root = nullptr;
     m_frame = nullptr;
 }
diff --git a/Libraries/LibWeb/DOM/Node.h b/Libraries/LibWeb/DOM/Node.h
index 771a87f78d..ce1f9e23e0 100644
--- a/Libraries/LibWeb/DOM/Node.h
+++ b/Libraries/LibWeb/DOM/Node.h
@@ -128,6 +128,9 @@ public:
 
     bool is_link() const;
 
+    virtual void document_did_attach_to_frame(Frame&) {}
+    virtual void document_will_detach_from_frame(Frame&) {}
+
 protected:
     Node(Document&, NodeType);