FragmentOrElement.h
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* Base class for all element classes as well as nsDocumentFragment. This
* provides an implementation of nsIDOMNode, implements nsIContent, provides
* utility methods for subclasses, and so forth.
*/
#ifndef FragmentOrElement_h___
#define FragmentOrElement_h___
#include "mozilla/Attributes.h"
#include "mozilla/MemoryReporting.h"
#include "nsAttrAndChildArray.h" // member
#include "nsCycleCollectionParticipant.h" // NS_DECL_CYCLE_*
#include "nsIContent.h" // base class
#include "nsIWeakReference.h" // base class
#include "nsNodeUtils.h" // class member nsNodeUtils::CloneNodeImpl
#include "nsIHTMLCollection.h"
class ContentUnbinder;
class nsContentList;
class nsDOMAttributeMap;
class nsDOMTokenList;
class nsIControllers;
class nsICSSDeclaration;
class nsIDocument;
class nsDOMStringMap;
class nsIURI;
namespace mozilla {
namespace dom {
class Element;
}
}
/**
* A class that implements nsIWeakReference
*/
class nsNodeWeakReference final : public nsIWeakReference
{
public:
explicit nsNodeWeakReference(nsINode* aNode)
: mNode(aNode)
{
}
// nsISupports
NS_DECL_ISUPPORTS
// nsIWeakReference
NS_DECL_NSIWEAKREFERENCE
virtual size_t SizeOfOnlyThis(mozilla::MallocSizeOf aMallocSizeOf) const override;
void NoticeNodeDestruction()
{
mNode = nullptr;
}
private:
~nsNodeWeakReference();
nsINode* mNode;
};
/**
* Tearoff to use for nodes to implement nsISupportsWeakReference
*/
class nsNodeSupportsWeakRefTearoff final : public nsISupportsWeakReference
{
public:
explicit nsNodeSupportsWeakRefTearoff(nsINode* aNode)
: mNode(aNode)
{
}
// nsISupports
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
// nsISupportsWeakReference
NS_DECL_NSISUPPORTSWEAKREFERENCE
NS_DECL_CYCLE_COLLECTION_CLASS(nsNodeSupportsWeakRefTearoff)
private:
~nsNodeSupportsWeakRefTearoff() {}
nsCOMPtr<nsINode> mNode;
};
/**
* A generic base class for DOM elements, implementing many nsIContent,
* nsIDOMNode and nsIDOMElement methods.
*/
namespace mozilla {
namespace dom {
class ShadowRoot;
class UndoManager;
class FragmentOrElement : public nsIContent
{
public:
explicit FragmentOrElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo);
explicit FragmentOrElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_SIZEOF_EXCLUDING_THIS
// nsINode interface methods
virtual uint32_t GetChildCount() const override;
virtual nsIContent *GetChildAt(uint32_t aIndex) const override;
virtual nsIContent * const * GetChildArray(uint32_t* aChildCount) const override;
virtual int32_t IndexOf(const nsINode* aPossibleChild) const override;
virtual nsresult InsertChildAt(nsIContent* aKid, uint32_t aIndex,
bool aNotify) override;
virtual void RemoveChildAt(uint32_t aIndex, bool aNotify) override;
virtual void GetTextContentInternal(nsAString& aTextContent,
mozilla::ErrorResult& aError) override;
virtual void SetTextContentInternal(const nsAString& aTextContent,
mozilla::ErrorResult& aError) override;
// nsIContent interface methods
virtual already_AddRefed<nsINodeList> GetChildren(uint32_t aFilter) override;
virtual const nsTextFragment *GetText() override;
virtual uint32_t TextLength() const override;
virtual nsresult SetText(const char16_t* aBuffer, uint32_t aLength,
bool aNotify) override;
// Need to implement this here too to avoid hiding.
nsresult SetText(const nsAString& aStr, bool aNotify)
{
return SetText(aStr.BeginReading(), aStr.Length(), aNotify);
}
virtual nsresult AppendText(const char16_t* aBuffer, uint32_t aLength,
bool aNotify) override;
virtual bool TextIsOnlyWhitespace() override;
virtual bool HasTextForTranslation() override;
virtual void AppendTextTo(nsAString& aResult) override;
MOZ_WARN_UNUSED_RESULT
virtual bool AppendTextTo(nsAString& aResult, const mozilla::fallible_t&) override;
virtual nsIContent *GetBindingParent() const override;
virtual nsXBLBinding *GetXBLBinding() const override;
virtual void SetXBLBinding(nsXBLBinding* aBinding,
nsBindingManager* aOldBindingManager = nullptr) override;
virtual ShadowRoot *GetShadowRoot() const override;
virtual ShadowRoot *GetContainingShadow() const override;
virtual nsTArray<nsIContent*> &DestInsertionPoints() override;
virtual nsTArray<nsIContent*> *GetExistingDestInsertionPoints() const override;
virtual void SetShadowRoot(ShadowRoot* aBinding) override;
virtual nsIContent *GetXBLInsertionParent() const override;
virtual void SetXBLInsertionParent(nsIContent* aContent) override;
virtual bool IsLink(nsIURI** aURI) const override;
virtual CustomElementData *GetCustomElementData() const override;
virtual void SetCustomElementData(CustomElementData* aData) override;
virtual void DestroyContent() override;
virtual void SaveSubtreeState() override;
NS_IMETHOD WalkContentStyleRules(nsRuleWalker* aRuleWalker) override;
nsIHTMLCollection* Children();
uint32_t ChildElementCount()
{
return Children()->Length();
}
/**
* Sets the IsElementInStyleScope flag on each element in the subtree rooted
* at this node, including any elements reachable through shadow trees.
*
* @param aInStyleScope The flag value to set.
*/
void SetIsElementInStyleScopeFlagOnSubtree(bool aInStyleScope);
public:
/**
* If there are listeners for DOMNodeInserted event, fires the event on all
* aNodes
*/
static void FireNodeInserted(nsIDocument* aDoc,
nsINode* aParent,
nsTArray<nsCOMPtr<nsIContent> >& aNodes);
NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS(FragmentOrElement)
/**
* Fire a DOMNodeRemoved mutation event for all children of this node
*/
void FireNodeRemovedForChildren();
virtual bool OwnedOnlyByTheDOMTree() override
{
uint32_t rc = mRefCnt.get();
if (GetParent()) {
--rc;
}
rc -= mAttrsAndChildren.ChildCount();
return rc == 0;
}
virtual bool IsPurple() override
{
return mRefCnt.IsPurple();
}
virtual void RemovePurple() override
{
mRefCnt.RemovePurple();
}
static void ClearContentUnbinder();
static bool CanSkip(nsINode* aNode, bool aRemovingAllowed);
static bool CanSkipInCC(nsINode* aNode);
static bool CanSkipThis(nsINode* aNode);
static void RemoveBlackMarkedNode(nsINode* aNode);
static void MarkNodeChildren(nsINode* aNode);
static void InitCCCallbacks();
static void MarkUserData(void* aObject, nsIAtom* aKey, void* aChild,
void *aData);
/**
* Is the HTML local name a void element?
*/
static bool IsHTMLVoid(nsIAtom* aLocalName);
protected:
virtual ~FragmentOrElement();
/**
* Copy attributes and state to another element
* @param aDest the object to copy to
*/
nsresult CopyInnerTo(FragmentOrElement* aDest);
public:
// Because of a bug in MS C++ compiler nsDOMSlots must be declared public,
// otherwise nsXULElement::nsXULSlots doesn't compile.
/**
* There are a set of DOM- and scripting-specific instance variables
* that may only be instantiated when a content object is accessed
* through the DOM. Rather than burn actual slots in the content
* objects for each of these instance variables, we put them off
* in a side structure that's only allocated when the content is
* accessed through the DOM.
*/
class nsDOMSlots : public nsINode::nsSlots
{
public:
nsDOMSlots();
virtual ~nsDOMSlots();
void Traverse(nsCycleCollectionTraversalCallback &cb, bool aIsXUL);
void Unlink(bool aIsXUL);
size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
/**
* The .style attribute (an interface that forwards to the actual
* style rules)
* @see nsGenericHTMLElement::GetStyle
*/
nsCOMPtr<nsICSSDeclaration> mStyle;
/**
* The .dataset attribute.
* @see nsGenericHTMLElement::GetDataset
*/
nsDOMStringMap* mDataset; // [Weak]
/**
* The .undoManager property.
* @see nsGenericHTMLElement::GetUndoManager
*/
nsRefPtr<UndoManager> mUndoManager;
/**
* SMIL Overridde style rules (for SMIL animation of CSS properties)
* @see nsIContent::GetSMILOverrideStyle
*/
nsCOMPtr<nsICSSDeclaration> mSMILOverrideStyle;
/**
* Holds any SMIL override style rules for this element.
*/
nsRefPtr<mozilla::css::StyleRule> mSMILOverrideStyleRule;
/**
* An object implementing nsIDOMMozNamedAttrMap for this content (attributes)
* @see FragmentOrElement::GetAttributes
*/
nsRefPtr<nsDOMAttributeMap> mAttributeMap;
union {
/**
* The nearest enclosing content node with a binding that created us.
* @see FragmentOrElement::GetBindingParent
*/
nsIContent* mBindingParent; // [Weak]
/**
* The controllers of the XUL Element.
*/
nsIControllers* mControllers; // [OWNER]
};
/**
* An object implementing the .children property for this element.
*/
nsRefPtr<nsContentList> mChildrenList;
/**
* An object implementing the .classList property for this element.
*/
nsRefPtr<nsDOMTokenList> mClassList;
/**
* ShadowRoot bound to the element.
*/
nsRefPtr<ShadowRoot> mShadowRoot;
/**
* The root ShadowRoot of this element if it is in a shadow tree.
*/
nsRefPtr<ShadowRoot> mContainingShadow;
/**
* An array of web component insertion points to which this element
* is distributed.
*/
nsTArray<nsIContent*> mDestInsertionPoints;
/**
* XBL binding installed on the element.
*/
nsRefPtr<nsXBLBinding> mXBLBinding;
/**
* XBL binding installed on the lement.
*/
nsCOMPtr<nsIContent> mXBLInsertionParent;
/**
* Web components custom element data.
*/
nsRefPtr<CustomElementData> mCustomElementData;
};
protected:
void GetMarkup(bool aIncludeSelf, nsAString& aMarkup);
void SetInnerHTMLInternal(const nsAString& aInnerHTML, ErrorResult& aError);
// Override from nsINode
virtual nsINode::nsSlots* CreateSlots() override;
nsDOMSlots *DOMSlots()
{
return static_cast<nsDOMSlots*>(Slots());
}
nsDOMSlots *GetExistingDOMSlots() const
{
return static_cast<nsDOMSlots*>(GetExistingSlots());
}
/**
* Calls SetIsElementInStyleScopeFlagOnSubtree for each shadow tree attached
* to this node, which is assumed to be an Element.
*
* @param aInStyleScope The IsElementInStyleScope flag value to set.
*/
void SetIsElementInStyleScopeFlagOnShadowTree(bool aInStyleScope);
friend class ::ContentUnbinder;
/**
* Array containing all attributes and children for this element
*/
nsAttrAndChildArray mAttrsAndChildren;
};
} // namespace dom
} // namespace mozilla
#define NS_ELEMENT_INTERFACE_TABLE_TO_MAP_SEGUE \
if (NS_SUCCEEDED(rv)) \
return rv; \
\
rv = FragmentOrElement::QueryInterface(aIID, aInstancePtr); \
NS_INTERFACE_TABLE_TO_MAP_SEGUE
#endif /* FragmentOrElement_h___ */
