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      1 /*
      2  * Copyright (C) 2012 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef InsertionPoint_h
     32 #define InsertionPoint_h
     33 
     34 #include "core/css/CSSSelectorList.h"
     35 #include "core/dom/shadow/ContentDistribution.h"
     36 #include "core/dom/shadow/ShadowRoot.h"
     37 #include "core/html/HTMLElement.h"
     38 #include "wtf/Forward.h"
     39 
     40 namespace WebCore {
     41 
     42 class InsertionPoint : public HTMLElement {
     43 public:
     44     virtual ~InsertionPoint();
     45 
     46     bool hasDistribution() const { return !m_distribution.isEmpty(); }
     47     void setDistribution(ContentDistribution&);
     48     void clearDistribution() { m_distribution.clear(); }
     49     bool isActive() const;
     50     bool canBeActive() const;
     51 
     52     bool isShadowInsertionPoint() const;
     53     bool isContentInsertionPoint() const;
     54 
     55     PassRefPtr<NodeList> getDistributedNodes();
     56 
     57     virtual bool canAffectSelector() const { return false; }
     58 
     59     bool resetStyleInheritance() const;
     60     void setResetStyleInheritance(bool);
     61 
     62     virtual void attach(const AttachContext& = AttachContext()) OVERRIDE;
     63     virtual void detach(const AttachContext& = AttachContext()) OVERRIDE;
     64 
     65     bool shouldUseFallbackElements() const;
     66 
     67     size_t size() const { return m_distribution.size(); }
     68     Node* at(size_t index)  const { return m_distribution.at(index).get(); }
     69     Node* first() const { return m_distribution.isEmpty() ? 0 : m_distribution.first().get(); }
     70     Node* last() const { return m_distribution.isEmpty() ? 0 : m_distribution.last().get(); }
     71     Node* nextTo(const Node* node) const { return m_distribution.nextTo(node); }
     72     Node* previousTo(const Node* node) const { return m_distribution.previousTo(node); }
     73 
     74 protected:
     75     InsertionPoint(const QualifiedName&, Document&);
     76     virtual bool rendererIsNeeded(const RenderStyle&) OVERRIDE;
     77     virtual void childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta) OVERRIDE;
     78     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     79     virtual void removedFrom(ContainerNode*) OVERRIDE;
     80     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     81     virtual void willRecalcStyle(StyleRecalcChange) OVERRIDE;
     82 
     83 private:
     84     ContentDistribution m_distribution;
     85     bool m_registeredWithShadowRoot;
     86 };
     87 
     88 typedef Vector<RefPtr<InsertionPoint> > DestinationInsertionPoints;
     89 
     90 DEFINE_NODE_TYPE_CASTS(InsertionPoint, isInsertionPoint());
     91 
     92 inline bool isActiveInsertionPoint(const Node& node)
     93 {
     94     return node.isInsertionPoint() && toInsertionPoint(node).isActive();
     95 }
     96 
     97 inline bool isActiveShadowInsertionPoint(const Node& node)
     98 {
     99     return node.isInsertionPoint() && toInsertionPoint(node).isShadowInsertionPoint();
    100 }
    101 
    102 inline ElementShadow* shadowWhereNodeCanBeDistributed(const Node& node)
    103 {
    104     Node* parent = node.parentNode();
    105     if (!parent)
    106         return 0;
    107     if (parent->isShadowRoot() && !toShadowRoot(parent)->isYoungest())
    108         return node.shadowHost()->shadow();
    109     if (isActiveInsertionPoint(*parent))
    110         return node.shadowHost()->shadow();
    111     if (parent->isElementNode())
    112         return toElement(parent)->shadow();
    113     return 0;
    114 }
    115 
    116 const InsertionPoint* resolveReprojection(const Node*);
    117 
    118 void collectDestinationInsertionPoints(const Node&, Vector<InsertionPoint*, 8>& results);
    119 
    120 } // namespace WebCore
    121 
    122 #endif // InsertionPoint_h
    123