From e31ed5b07466d4a579fe4b025f97c971003fbc3f Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <email@mattatobin.com>
Date: Fri, 17 Apr 2020 07:10:54 -0400
Subject: Bug 1409975 - Implement node distribution for shadow tree slots

* Implementation for assignedNodes
* Include slots in the flat tree
* Fix event get-the-parent algorithm for a node
* Update and add reftests for Shadow DOM v1
* Update web platform tests expectations

Tag #1375
---
 dom/base/ShadowRoot.h | 33 +++++++++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

(limited to 'dom/base/ShadowRoot.h')

diff --git a/dom/base/ShadowRoot.h b/dom/base/ShadowRoot.h
index 5efff5be7..c525ba8e8 100644
--- a/dom/base/ShadowRoot.h
+++ b/dom/base/ShadowRoot.h
@@ -21,6 +21,9 @@ class nsIContent;
 class nsXBLPrototypeBinding;
 
 namespace mozilla {
+
+class EventChainPreVisitor;
+
 namespace dom {
 
 class Element;
@@ -73,10 +76,26 @@ public:
 
 private:
   /**
-   * Redistributes a node of the pool, and returns whether the distribution
+   * Try to reassign an element to a slot and returns whether the assignment
    * changed.
    */
-  bool RedistributeElement(Element*);
+  bool MaybeReassignElement(Element* aElement, const nsAttrValue* aOldValue);
+
+  /**
+   * Try to assign aContent to a slot in the shadow tree, returns the assigned
+   * slot if found.
+   */
+  const HTMLSlotElement* AssignSlotFor(nsIContent* aContent);
+
+  /**
+   * Unassign aContent from the assigned slot in the shadow tree, returns the
+   * assigned slot if found.
+   *
+   * Note: slot attribute of aContent may have changed already, so pass slot
+   *       name explicity here.
+   */
+  const HTMLSlotElement* UnassignSlotFor(nsIContent* aContent,
+                                         const nsAString& aSlotName);
 
   /**
    * Called when we redistribute content after insertion points have changed.
@@ -86,6 +105,9 @@ private:
   bool IsPooledNode(nsIContent* aChild) const;
 
 public:
+  void AddSlot(HTMLSlotElement* aSlot);
+  void RemoveSlot(HTMLSlotElement* aSlot);
+
   void SetInsertionPointChanged() { mInsertionPointChanged = true; }
 
   void SetAssociatedBinding(nsXBLBinding* aBinding) { mAssociatedBinding = aBinding; }
@@ -113,11 +135,18 @@ public:
     mIsComposedDocParticipant = aIsComposedDocParticipant;
   }
 
+  nsresult GetEventTargetParent(EventChainPreVisitor& aVisitor) override;
+
 protected:
   virtual ~ShadowRoot();
 
   ShadowRootMode mMode;
 
+  // Map from name of slot to an array of all slots in the shadow DOM with with
+  // the given name. The slots are stored as a weak pointer because the elements
+  // are in the shadow tree and should be kept alive by its parent.
+  nsClassHashtable<nsStringHashKey, nsTArray<mozilla::dom::HTMLSlotElement*>> mSlotMap;
+
   nsTHashtable<nsIdentifierMapEntry> mIdentifierMap;
   nsXBLPrototypeBinding* mProtoBinding;
 
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