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/*
* 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 THIRD_PARTY_BLINK_RENDERER_CORE_DOM_TREE_SCOPE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_DOM_TREE_SCOPE_H_
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/dom/tree_ordered_map.h"
#include "third_party/blink/renderer/core/html/forms/radio_button_group_scope.h"
#include "third_party/blink/renderer/core/layout/hit_test_request.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
namespace blink {
class ContainerNode;
class DOMSelection;
class Document;
class Element;
class HTMLMapElement;
class HitTestResult;
class IdTargetObserverRegistry;
class SVGTreeScopeResources;
class ScopedStyleResolver;
class StyleSheetList;
// The root node of a document tree (in which case this is a Document) or of a
// shadow tree (in which case this is a ShadowRoot). Various things, like
// element IDs, are scoped to the TreeScope in which they are rooted, if any.
//
// 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 CORE_EXPORT TreeScope : public GarbageCollectedMixin {
public:
enum HitTestPointType {
kInternal = 1 << 1,
kWebExposed = 1 << 2,
};
TreeScope* ParentTreeScope() const { return parent_tree_scope_; }
bool IsInclusiveOlderSiblingShadowRootOrAncestorTreeScopeOf(
const TreeScope&) const;
Element* AdjustedFocusedElement() const;
// Finds a retargeted element to the given argument, when the retargeted
// element is in this TreeScope. Returns null otherwise.
// TODO(kochi): once this algorithm is named in the spec, rename the method
// name.
Element* AdjustedElement(const Element&) const;
Element* getElementById(const AtomicString&) const;
const HeapVector<Member<Element>>& GetAllElementsById(
const AtomicString&) const;
bool HasElementWithId(const AtomicString& id) const;
bool ContainsMultipleElementsWithId(const AtomicString& id) const;
void AddElementById(const AtomicString& element_id, Element&);
void RemoveElementById(const AtomicString& element_id, Element&);
Document& GetDocument() const {
DCHECK(document_);
return *document_;
}
Node* AncestorInThisScope(Node*) const;
void AddImageMap(HTMLMapElement&);
void RemoveImageMap(HTMLMapElement&);
HTMLMapElement* GetImageMap(const String& url) const;
Element* ElementFromPoint(double x, double y) const;
Element* HitTestPoint(double x, double y, const HitTestRequest&) const;
HeapVector<Member<Element>> ElementsFromPoint(double x, double y) const;
HeapVector<Member<Element>> ElementsFromHitTestResult(HitTestResult&) const;
DOMSelection* GetSelection() const;
Element* Retarget(const Element& target) const;
Element* AdjustedFocusedElementInternal(const Element& target) const;
// Find first anchor with the given name.
// First searches for an element with the given ID, but if that fails, then
// looks for an anchor with the given name. ID matching is always case
// sensitive, but Anchor name matching is case sensitive in strict mode and
// not case sensitive in quirks mode for historical compatibility reasons.
Element* FindAnchor(const String& name);
// Used by the basic DOM mutation methods (e.g., appendChild()).
void AdoptIfNeeded(Node&);
ContainerNode& RootNode() const { return *root_node_; }
IdTargetObserverRegistry& GetIdTargetObserverRegistry() const {
return *id_target_observer_registry_.Get();
}
RadioButtonGroupScope& GetRadioButtonGroupScope() {
return radio_button_group_scope_;
}
bool IsInclusiveAncestorOf(const TreeScope&) const;
unsigned short ComparePosition(const TreeScope&) const;
const TreeScope* CommonAncestorTreeScope(const TreeScope& other) const;
TreeScope* CommonAncestorTreeScope(TreeScope& other);
Element* GetElementByAccessKey(const String& key) const;
void Trace(blink::Visitor*) override;
ScopedStyleResolver* GetScopedStyleResolver() const {
return scoped_style_resolver_.Get();
}
ScopedStyleResolver& EnsureScopedStyleResolver();
void ClearScopedStyleResolver();
SVGTreeScopeResources& EnsureSVGTreeScopedResources();
bool HasAdoptedStyleSheets() const;
StyleSheetList& AdoptedStyleSheets();
void SetAdoptedStyleSheets(StyleSheetList*);
void SetAdoptedStyleSheets(StyleSheetList*, ExceptionState&);
protected:
TreeScope(ContainerNode&, Document&);
TreeScope(Document&);
virtual ~TreeScope();
void ResetTreeScope();
void SetDocument(Document& document) { document_ = &document; }
void SetParentTreeScope(TreeScope&);
void SetNeedsStyleRecalcForViewportUnits();
private:
Element* HitTestPointInternal(Node*, HitTestPointType) const;
Member<ContainerNode> root_node_;
Member<Document> document_;
Member<TreeScope> parent_tree_scope_;
Member<TreeOrderedMap> elements_by_id_;
Member<TreeOrderedMap> image_maps_by_name_;
Member<IdTargetObserverRegistry> id_target_observer_registry_;
Member<ScopedStyleResolver> scoped_style_resolver_;
mutable Member<DOMSelection> selection_;
RadioButtonGroupScope radio_button_group_scope_;
Member<SVGTreeScopeResources> svg_tree_scoped_resources_;
Member<StyleSheetList> adopted_style_sheets_;
};
inline bool TreeScope::HasElementWithId(const AtomicString& id) const {
DCHECK(!id.IsNull());
return elements_by_id_ && elements_by_id_->Contains(id);
}
inline bool TreeScope::ContainsMultipleElementsWithId(
const AtomicString& id) const {
return elements_by_id_ && elements_by_id_->ContainsMultiple(id);
}
DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES(TreeScope)
HitTestResult HitTestInDocument(
Document*,
double x,
double y,
const HitTestRequest& = HitTestRequest::kReadOnly |
HitTestRequest::kActive);
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_DOM_TREE_SCOPE_H_
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