Bug 1408341 - Implement assignedSlot on Element and Text

Tag #1375

7 files changed, 80 insertions, 0 deletions

diff --git a/dom/base/FragmentOrElement.cpp b/dom/base/FragmentOrElement.cpp
index 592f5447d..486bbc88c 100644
--- a/dom/base/FragmentOrElement.cpp
+++ b/dom/base/FragmentOrElement.cpp
@@ -123,6 +123,7 @@
 #include "mozilla/CORSMode.h"
 
 #include "mozilla/dom/ShadowRoot.h"
+#include "mozilla/dom/HTMLSlotElement.h"
 #include "mozilla/dom/HTMLTemplateElement.h"
 
 #include "nsStyledElement.h"
@@ -614,6 +615,9 @@ FragmentOrElement::nsDOMSlots::Traverse(nsCycleCollectionTraversalCallback &cb)
   NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mExtendedSlots->mContainingShadow");
   cb.NoteXPCOMChild(NS_ISUPPORTS_CAST(nsIContent*, mExtendedSlots->mContainingShadow));
 
+  NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mExtendedSlots->mAssignedSlot");
+  cb.NoteXPCOMChild(NS_ISUPPORTS_CAST(nsIContent*, mExtendedSlots->mAssignedSlot.get()));
+
   NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mExtendedSlots->mXBLBinding");
   cb.NoteNativeChild(mExtendedSlots->mXBLBinding,
                      NS_CYCLE_COLLECTION_PARTICIPANT(nsXBLBinding));
@@ -657,6 +661,7 @@ FragmentOrElement::nsDOMSlots::Unlink()
   mExtendedSlots->mLabelsList = nullptr;
   mExtendedSlots->mShadowRoot = nullptr;
   mExtendedSlots->mContainingShadow = nullptr;
+  mExtendedSlots->mAssignedSlot = nullptr;
   MOZ_ASSERT(!(mExtendedSlots->mXBLBinding));
   mExtendedSlots->mXBLInsertionParent = nullptr;
   if (mExtendedSlots->mCustomElementData) {
@@ -1126,6 +1131,20 @@ FragmentOrElement::GetExistingDestInsertionPoints() const
   return nullptr;
 }
 
+HTMLSlotElement*
+FragmentOrElement::GetAssignedSlot() const
+{
+  nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots();
+  return slots ? slots->mAssignedSlot.get() : nullptr;
+}
+
+void
+FragmentOrElement::SetAssignedSlot(HTMLSlotElement* aSlot)
+{
+  nsExtendedDOMSlots* slots = ExtendedDOMSlots();
+  slots->mAssignedSlot = aSlot;
+}
+
 void
 FragmentOrElement::SetXBLInsertionParent(nsIContent* aContent)
 {
diff --git a/dom/base/FragmentOrElement.h b/dom/base/FragmentOrElement.h
index 07403cf39..df05bcb50 100644
--- a/dom/base/FragmentOrElement.h
+++ b/dom/base/FragmentOrElement.h
@@ -158,6 +158,8 @@ public:
   virtual nsTArray<nsIContent*> &DestInsertionPoints() override;
   virtual nsTArray<nsIContent*> *GetExistingDestInsertionPoints() const override;
   virtual void SetShadowRoot(ShadowRoot* aBinding) override;
+  virtual mozilla::dom::HTMLSlotElement* GetAssignedSlot() const override;
+  virtual void SetAssignedSlot(mozilla::dom::HTMLSlotElement* aSlot) override;
   virtual nsIContent *GetXBLInsertionParent() const override;
   virtual void SetXBLInsertionParent(nsIContent* aContent) override;
   virtual bool IsLink(nsIURI** aURI) const override;
@@ -301,6 +303,11 @@ public:
     nsTArray<nsIContent*> mDestInsertionPoints;
 
     /**
+     * The assigned slot associated with this element.
+     */
+    RefPtr<mozilla::dom::HTMLSlotElement> mAssignedSlot;
+
+    /**
      * XBL binding installed on the element.
      */
     RefPtr<nsXBLBinding> mXBLBinding;
diff --git a/dom/base/nsGenericDOMDataNode.cpp b/dom/base/nsGenericDOMDataNode.cpp
index 73463ea5e..e5cc852d2 100644
--- a/dom/base/nsGenericDOMDataNode.cpp
+++ b/dom/base/nsGenericDOMDataNode.cpp
@@ -15,6 +15,7 @@
 #include "mozilla/AsyncEventDispatcher.h"
 #include "mozilla/MemoryReporting.h"
 #include "mozilla/dom/Element.h"
+#include "mozilla/dom/HTMLSlotElement.h"
 #include "mozilla/dom/ShadowRoot.h"
 #include "nsIDocument.h"
 #include "nsIDOMDocument.h"
@@ -753,6 +754,20 @@ nsGenericDOMDataNode::GetExistingDestInsertionPoints() const
   return nullptr;
 }
 
+HTMLSlotElement*
+nsGenericDOMDataNode::GetAssignedSlot() const
+{
+  nsDataSlots *slots = GetExistingDataSlots();
+  return slots ? slots->mAssignedSlot.get() : nullptr;
+}
+
+void
+nsGenericDOMDataNode::SetAssignedSlot(HTMLSlotElement* aSlot)
+{
+  nsDataSlots *slots = DataSlots();
+  slots->mAssignedSlot = aSlot;
+}
+
 nsXBLBinding *
 nsGenericDOMDataNode::GetXBLBinding() const
 {
@@ -843,6 +858,9 @@ nsGenericDOMDataNode::nsDataSlots::Traverse(nsCycleCollectionTraversalCallback &
 
   NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mContainingShadow");
   cb.NoteXPCOMChild(NS_ISUPPORTS_CAST(nsIContent*, mContainingShadow));
+
+  NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mAssignedSlot");
+  cb.NoteXPCOMChild(NS_ISUPPORTS_CAST(nsIContent*, mAssignedSlot.get()));
 }
 
 void
@@ -850,6 +868,7 @@ nsGenericDOMDataNode::nsDataSlots::Unlink()
 {
   mXBLInsertionParent = nullptr;
   mContainingShadow = nullptr;
+  mAssignedSlot = nullptr;
 }
 
 //----------------------------------------------------------------------
diff --git a/dom/base/nsGenericDOMDataNode.h b/dom/base/nsGenericDOMDataNode.h
index e8818b518..97bd79129 100644
--- a/dom/base/nsGenericDOMDataNode.h
+++ b/dom/base/nsGenericDOMDataNode.h
@@ -26,6 +26,12 @@
 class nsIDocument;
 class nsIDOMText;
 
+namespace mozilla {
+namespace dom {
+class HTMLSlotElement;
+} // namespace dom
+} // namespace mozilla
+
 #define DATA_NODE_FLAG_BIT(n_) NODE_FLAG_BIT(NODE_TYPE_SPECIFIC_BITS_OFFSET + (n_))
 
 // Data node specific flags
@@ -157,6 +163,8 @@ public:
   virtual nsTArray<nsIContent*> &DestInsertionPoints() override;
   virtual nsTArray<nsIContent*> *GetExistingDestInsertionPoints() const override;
   virtual void SetShadowRoot(mozilla::dom::ShadowRoot* aShadowRoot) override;
+  virtual mozilla::dom::HTMLSlotElement* GetAssignedSlot() const override;
+  virtual void SetAssignedSlot(mozilla::dom::HTMLSlotElement* aSlot) override;
   virtual nsIContent *GetXBLInsertionParent() const override;
   virtual void SetXBLInsertionParent(nsIContent* aContent) override;
   virtual bool IsNodeOfType(uint32_t aFlags) const override;
@@ -264,6 +272,11 @@ protected:
      * @see nsIContent::GetDestInsertionPoints
      */
     nsTArray<nsIContent*> mDestInsertionPoints;
+
+    /**
+     * @see nsIContent::GetAssignedSlot
+     */
+    RefPtr<mozilla::dom::HTMLSlotElement> mAssignedSlot;
   };
 
   // Override from nsINode
diff --git a/dom/base/nsIContent.h b/dom/base/nsIContent.h
index 25b582abd..f368497f4 100644
--- a/dom/base/nsIContent.h
+++ b/dom/base/nsIContent.h
@@ -26,6 +26,7 @@ namespace mozilla {
 class EventChainPreVisitor;
 namespace dom {
 class ShadowRoot;
+class HTMLSlotElement;
 } // namespace dom
 namespace widget {
 struct IMEState;
@@ -710,6 +711,20 @@ public:
   virtual nsTArray<nsIContent*> *GetExistingDestInsertionPoints() const = 0;
 
   /**
+   * Gets the assigned slot associated with this content.
+   *
+   * @return The assigned slot element or null.
+   */
+  virtual mozilla::dom::HTMLSlotElement* GetAssignedSlot() const = 0;
+
+  /**
+   * Sets the assigned slot associated with this content.
+   *
+   * @param aSlot The assigned slot.
+   */
+  virtual void SetAssignedSlot(mozilla::dom::HTMLSlotElement* aSlot) = 0;
+
+  /**
    * Gets the insertion parent element of the XBL binding.
    * The insertion parent is our one true parent in the transformed DOM.
    *
diff --git a/dom/webidl/Element.webidl b/dom/webidl/Element.webidl
index a6b2bfdd5..7fc59d614 100644
--- a/dom/webidl/Element.webidl
+++ b/dom/webidl/Element.webidl
@@ -236,6 +236,8 @@ partial interface Element {
   NodeList getDestinationInsertionPoints();
   [Func="nsDocument::IsWebComponentsEnabled"]
   readonly attribute ShadowRoot? shadowRoot;
+  [Pref="nsDocument::IsWebComponentsEnabled"]
+  readonly attribute HTMLSlotElement? assignedSlot;
 };
 
 Element implements ChildNode;
diff --git a/dom/webidl/Text.webidl b/dom/webidl/Text.webidl
index dcd25cec3..f7bd1a971 100644
--- a/dom/webidl/Text.webidl
+++ b/dom/webidl/Text.webidl
@@ -18,4 +18,9 @@ interface Text : CharacterData {
   readonly attribute DOMString wholeText;
 };
 
+partial interface Text {
+  [Pref="dom.webcomponents.enabled"]
+  readonly attribute HTMLSlotElement? assignedSlot;
+};
+
 Text implements GeometryUtils;