Home | History | Annotate | Download | only in shadow 
      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/ContentDistributor.h"
     36 #include "core/dom/shadow/ElementShadow.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& distribution) { m_distribution.swap(distribution); }
     48     void clearDistribution() { m_distribution.clear(); }
     49     bool isActive() const;
     50 
     51     PassRefPtr<NodeList> getDistributedNodes();
     52 
     53     virtual bool canAffectSelector() const { return false; }
     54 
     55     bool resetStyleInheritance() const;
     56     void setResetStyleInheritance(bool);
     57 
     58     virtual void attach(const AttachContext& = AttachContext()) OVERRIDE;
     59     virtual void detach(const AttachContext& = AttachContext()) OVERRIDE;
     60 
     61     bool shouldUseFallbackElements() const;
     62 
     63     size_t size() const { return m_distribution.size(); }
     64     Node* at(size_t index)  const { return m_distribution.at(index).get(); }
     65     Node* first() const { return m_distribution.isEmpty() ? 0 : m_distribution.first().get(); }
     66     Node* last() const { return m_distribution.isEmpty() ? 0 : m_distribution.last().get(); }
     67     Node* nextTo(const Node* node) const { return m_distribution.nextTo(node); }
     68     Node* previousTo(const Node* node) const { return m_distribution.previousTo(node); }
     69 
     70 protected:
     71     InsertionPoint(const QualifiedName&, Document*);
     72     virtual bool rendererIsNeeded(const NodeRenderingContext&) OVERRIDE;
     73     virtual void childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta) OVERRIDE;
     74     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     75     virtual void removedFrom(ContainerNode*) OVERRIDE;
     76     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     77     virtual void willRecalcStyle(StyleChange) OVERRIDE;
     78 
     79 private:
     80 
     81     ContentDistribution m_distribution;
     82     bool m_registeredWithShadowRoot;
     83 };
     84 
     85 inline InsertionPoint* toInsertionPoint(Node* node)
     86 {
     87     ASSERT_WITH_SECURITY_IMPLICATION(!node || node->isInsertionPoint());
     88     return static_cast<InsertionPoint*>(node);
     89 }
     90 
     91 inline const InsertionPoint* toInsertionPoint(const Node* node)
     92 {
     93     ASSERT_WITH_SECURITY_IMPLICATION(!node || node->isInsertionPoint());
     94     return static_cast<const InsertionPoint*>(node);
     95 }
     96 
     97 inline bool isActiveInsertionPoint(const Node* node)
     98 {
     99     return node->isInsertionPoint() && toInsertionPoint(node)->isActive();
    100 }
    101 
    102 inline Node* parentNodeForDistribution(const Node* node)
    103 {
    104     ASSERT(node);
    105 
    106     if (Node* parent = node->parentNode()) {
    107         if (parent->isInsertionPoint() && toInsertionPoint(parent)->shouldUseFallbackElements())
    108             return parent->parentNode();
    109         return parent;
    110     }
    111 
    112     return 0;
    113 }
    114 
    115 inline Element* parentElementForDistribution(const Node* node)
    116 {
    117     if (Node* parent = parentNodeForDistribution(node)) {
    118         if (parent->isElementNode())
    119             return toElement(parent);
    120     }
    121 
    122     return 0;
    123 }
    124 
    125 inline ElementShadow* shadowOfParentForDistribution(const Node* node)
    126 {
    127     ASSERT(node);
    128     if (Element* parent = parentElementForDistribution(node))
    129         return parent->shadow();
    130 
    131     return 0;
    132 }
    133 
    134 InsertionPoint* resolveReprojection(const Node*);
    135 
    136 void collectInsertionPointsWhereNodeIsDistributed(const Node*, Vector<InsertionPoint*, 8>& results);
    137 
    138 } // namespace WebCore
    139 
    140 #endif // InsertionPoint_h
    141