| /* |
| * 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 ElementShadow_h |
| #define ElementShadow_h |
| |
| #include "base/macros.h" |
| #include "core/CoreExport.h" |
| #include "core/dom/ShadowRoot.h" |
| #include "platform/bindings/ScriptWrappable.h" |
| #include "platform/bindings/TraceWrapperMember.h" |
| #include "platform/heap/Handle.h" |
| |
| namespace blink { |
| |
| class ElementShadowV0; |
| |
| class CORE_EXPORT ElementShadow final : public GarbageCollected<ElementShadow>, |
| public TraceWrapperBase { |
| public: |
| static ElementShadow* Create(); |
| |
| Element& Host() const { |
| DCHECK(shadow_root_); |
| return shadow_root_->host(); |
| } |
| |
| // TODO(hayato): Remove youngestShadowRoot() and oldestShadowRoot() from |
| // ElementShadow |
| ShadowRoot& YoungestShadowRoot() const; |
| ShadowRoot& OldestShadowRoot() const { |
| DCHECK(shadow_root_); |
| return *shadow_root_; |
| } |
| |
| ElementShadow* ContainingShadow() const; |
| |
| ShadowRoot& AddShadowRoot(Element& shadow_host, ShadowRootType); |
| |
| bool HasSameStyles(const ElementShadow&) const; |
| |
| void Attach(const Node::AttachContext&); |
| void Detach(const Node::AttachContext&); |
| |
| void DistributeIfNeeded(); |
| |
| void SetNeedsDistributionRecalcWillBeSetNeedsAssignmentRecalc(); |
| void SetNeedsDistributionRecalc(); |
| bool NeedsDistributionRecalc() const { return needs_distribution_recalc_; } |
| |
| bool IsV1() const { return YoungestShadowRoot().IsV1(); } |
| bool IsOpenOrV0() const { return YoungestShadowRoot().IsOpenOrV0(); } |
| |
| ElementShadowV0& V0() const { |
| DCHECK(element_shadow_v0_); |
| return *element_shadow_v0_; |
| } |
| |
| void Trace(blink::Visitor*); |
| void TraceWrappers(const ScriptWrappableVisitor*) const; |
| |
| private: |
| ElementShadow(); |
| |
| void AppendShadowRoot(ShadowRoot&); |
| void Distribute(); |
| |
| TraceWrapperMember<ElementShadowV0> element_shadow_v0_; |
| TraceWrapperMember<ShadowRoot> shadow_root_; |
| bool needs_distribution_recalc_; |
| DISALLOW_COPY_AND_ASSIGN(ElementShadow); |
| }; |
| |
| inline ShadowRoot* Node::YoungestShadowRoot() const { |
| if (!IsElementNode()) |
| return nullptr; |
| return ToElement(this)->YoungestShadowRoot(); |
| } |
| |
| inline ShadowRoot* Element::YoungestShadowRoot() const { |
| if (ElementShadow* shadow = Shadow()) |
| return &shadow->YoungestShadowRoot(); |
| return nullptr; |
| } |
| |
| inline ElementShadow* ElementShadow::ContainingShadow() const { |
| if (ShadowRoot* parent_root = Host().ContainingShadowRoot()) |
| return parent_root->Owner(); |
| return nullptr; |
| } |
| |
| inline void ElementShadow::DistributeIfNeeded() { |
| if (needs_distribution_recalc_) |
| Distribute(); |
| needs_distribution_recalc_ = false; |
| } |
| |
| } // namespace blink |
| |
| #endif |