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/*
* Copyright (C) 2012 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER 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_PSEUDO_ELEMENT_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_DOM_PSEUDO_ELEMENT_H_
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/platform/wtf/casting.h"
namespace blink {
class ComputedStyle;
class CORE_EXPORT PseudoElement : public Element {
public:
// |view_transition_name| is used to uniquely identify a pseudo element
// from a set of pseudo elements which share the same |pseudo_id|. The current
// usage of this ID is limited to pseudo elements generated for a
// ViewTransition. See
// third_party/blink/renderer/core/view_transition/README.md
static PseudoElement* Create(
Element* parent,
PseudoId pseudo_id,
const AtomicString& view_transition_name = g_null_atom);
PseudoElement(Element*,
PseudoId,
const AtomicString& view_transition_name = g_null_atom);
bool IsPseudoElement() const final { return true; }
const AtomicString& view_transition_name() const {
return view_transition_name_;
}
const ComputedStyle* CustomStyleForLayoutObject(
const StyleRecalcContext&) override;
void AttachLayoutTree(AttachContext&) override;
bool LayoutObjectIsNeeded(const DisplayStyle&) const override;
bool CanGeneratePseudoElement(PseudoId) const override;
bool CanGenerateContent() const;
bool CanHaveNestedPseudoElement() const;
bool CanStartSelection() const override { return false; }
bool CanContainRangeEndPoint() const override { return false; }
PseudoId GetPseudoId() const override { return pseudo_id_; }
// PseudoId that can be alias, e.g. kPseudoScrollMarkerGroupAfter is
// unresolved = alias, kPseudoScrollMarkerGroup is resolved.
// For styling and selector matching, return resolved version.
PseudoId GetPseudoIdForStyling() const override;
const AtomicString& GetPseudoArgument() const override {
return view_transition_name_;
}
// Return the adjusted style needed by layout. In some cases computed style
// cannot be used as-is by layout. display:contents needs to be adjusted to
// display:inline. Scroll marker pseudo elements may need to blockify the
// display type (depending on the parent). Returns nullptr if no adjustment is
// necessary.
const ComputedStyle* AdjustedLayoutStyle(
const ComputedStyle& style,
const ComputedStyle& layout_parent_style);
static AtomicString PseudoElementNameForEvents(Element*);
static bool IsWebExposed(PseudoId, const Node*);
// Pseudo elements are not allowed to be the inner node for hit testing.
// Find the closest ancestor which is a real dom node.
virtual Node* InnerNodeForHitTesting();
void AccessKeyAction(SimulatedClickCreationScope creation_scope) override;
// Returns the DOM element that this pseudo element originates from. If the
// pseudo element is nested inside another pseudo element, this returns the
// DOM element which the pseudo element tree originates from.
// This is different from |parentElement()| which returns the element's direct
// ancestor.
Element& UltimateOriginatingElement() const;
virtual void Dispose();
static bool IsLayoutSiblingOfOriginatingElement(PseudoId pseudo_id);
bool IsInertRoot() const override;
protected:
void SetIsGeneratedName(bool generated) { is_generated_name_ = generated; }
private:
class AttachLayoutTreeScope {
STACK_ALLOCATED();
public:
AttachLayoutTreeScope(PseudoElement*, const AttachContext&);
~AttachLayoutTreeScope();
private:
PseudoElement* element_;
const ComputedStyle* original_style_{nullptr};
};
PseudoId pseudo_id_;
const AtomicString view_transition_name_;
bool is_generated_name_ = false;
};
CORE_EXPORT const QualifiedName& PseudoElementTagName(PseudoId);
bool PseudoElementLayoutObjectIsNeeded(PseudoId pseudo_id,
const ComputedStyle* pseudo_style,
const Element* originating_element);
bool PseudoElementLayoutObjectIsNeeded(PseudoId pseudo_id,
const DisplayStyle& pseudo_style,
const Element* originating_element);
template <>
struct DowncastTraits<PseudoElement> {
static bool AllowFrom(const Node& node) { return node.IsPseudoElement(); }
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_DOM_PSEUDO_ELEMENT_H_
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