| /* |
| * Copyright (C) 2011 Google Inc. All Rights Reserved. |
| * Copyright (C) 2012 Apple Inc. All Rights Reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef SKY_ENGINE_CORE_DOM_TREESCOPE_H_ |
| #define SKY_ENGINE_CORE_DOM_TREESCOPE_H_ |
| |
| #include "sky/engine/core/dom/DocumentOrderedMap.h" |
| #include "sky/engine/platform/heap/Handle.h" |
| #include "sky/engine/wtf/text/AtomicString.h" |
| |
| namespace blink { |
| |
| class ContainerNode; |
| class Document; |
| class Element; |
| class HitTestResult; |
| class Node; |
| class ScopedStyleResolver; |
| |
| // A class which inherits both Node and TreeScope must call clearRareData() in its destructor |
| // so that the Node destructor no longer does problematic NodeList cache manipulation in |
| // the destructor. |
| class TreeScope { |
| public: |
| TreeScope* parentTreeScope() const { return m_parentTreeScope; } |
| |
| Element* getElementById(const AtomicString&) const; |
| void addElementById(const AtomicString& elementId, Element*); |
| void removeElementById(const AtomicString& elementId, Element*); |
| |
| Document& document() const |
| { |
| ASSERT(m_document); |
| return *m_document; |
| } |
| |
| Node* ancestorInThisScope(Node*) const; |
| |
| Element* elementFromPoint(int x, int y) const; |
| |
| // For accessibility. |
| bool shouldCacheLabelsByForAttribute() const { return m_labelsByForAttribute; } |
| |
| // Used by the basic DOM mutation methods (e.g., appendChild()). |
| void adoptIfNeeded(Node&); |
| |
| ContainerNode& rootNode() const { return *m_rootNode; } |
| |
| bool hasSameStyles(TreeScope&); |
| |
| #if !ENABLE(OILPAN) |
| // Nodes belonging to this scope hold guard references - |
| // these are enough to keep the scope from being destroyed, but |
| // not enough to keep it from removing its children. This allows a |
| // node that outlives its scope to still have a valid document |
| // pointer without introducing reference cycles. |
| void guardRef() |
| { |
| ASSERT(!deletionHasBegun()); |
| ++m_guardRefCount; |
| } |
| |
| void guardDeref() |
| { |
| ASSERT(m_guardRefCount > 0); |
| ASSERT(!deletionHasBegun()); |
| --m_guardRefCount; |
| if (!m_guardRefCount && !refCount() && !rootNodeHasTreeSharedParent()) { |
| beginDeletion(); |
| delete this; |
| } |
| } |
| #endif |
| |
| void removedLastRefToScope(); |
| |
| bool isInclusiveAncestorOf(const TreeScope&) const; |
| unsigned short comparePosition(const TreeScope&) const; |
| |
| const TreeScope* commonAncestorTreeScope(const TreeScope& other) const; |
| TreeScope* commonAncestorTreeScope(TreeScope& other); |
| |
| ScopedStyleResolver& scopedStyleResolver() const { return *m_scopedStyleResolver; } |
| |
| protected: |
| TreeScope(ContainerNode&, Document&); |
| explicit TreeScope(Document&); |
| virtual ~TreeScope(); |
| |
| #if !ENABLE(OILPAN) |
| void destroyTreeScopeData(); |
| #endif |
| |
| void setDocument(Document& document) { m_document = &document; } |
| void setParentTreeScope(TreeScope&); |
| |
| #if !ENABLE(OILPAN) |
| bool hasGuardRefCount() const { return m_guardRefCount; } |
| #endif |
| |
| void setNeedsStyleRecalcForViewportUnits(); |
| |
| private: |
| virtual void dispose() { } |
| |
| #if !ENABLE(OILPAN) |
| int refCount() const; |
| |
| #if ENABLE(SECURITY_ASSERT) |
| bool deletionHasBegun(); |
| void beginDeletion(); |
| #else |
| bool deletionHasBegun() { return false; } |
| void beginDeletion() { } |
| #endif |
| #endif |
| |
| bool rootNodeHasTreeSharedParent() const; |
| |
| RawPtr<ContainerNode> m_rootNode; |
| RawPtr<Document> m_document; |
| RawPtr<TreeScope> m_parentTreeScope; |
| |
| OwnPtr<ScopedStyleResolver> m_scopedStyleResolver; |
| |
| OwnPtr<DocumentOrderedMap> m_elementsById; |
| OwnPtr<DocumentOrderedMap> m_imageMapsByName; |
| OwnPtr<DocumentOrderedMap> m_labelsByForAttribute; |
| |
| int m_guardRefCount; |
| }; |
| |
| DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES(TreeScope) |
| |
| HitTestResult hitTestInDocument(const Document*, int x, int y); |
| TreeScope* commonTreeScope(Node*, Node*); |
| |
| } // namespace blink |
| |
| #endif // SKY_ENGINE_CORE_DOM_TREESCOPE_H_ |