Home | History | Annotate | Download | only in rendering 
      1 /*
      2  * Copyright (C) 2011 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 #include "config.h"
     32 #include "core/rendering/OrderIterator.h"
     33 
     34 #include "core/rendering/RenderBox.h"
     35 
     36 namespace WebCore {
     37 
     38 OrderIterator::OrderIterator(const RenderBox* containerBox)
     39     : m_containerBox(containerBox)
     40     , m_currentChild(0)
     41     , m_isReset(false)
     42 {
     43 }
     44 
     45 RenderBox* OrderIterator::first()
     46 {
     47     reset();
     48     return next();
     49 }
     50 
     51 RenderBox* OrderIterator::next()
     52 {
     53     do {
     54         if (!m_currentChild) {
     55             if (m_orderValuesIterator == m_orderValues.end())
     56                 return 0;
     57 
     58             if (!m_isReset) {
     59                 ++m_orderValuesIterator;
     60                 if (m_orderValuesIterator == m_orderValues.end())
     61                     return 0;
     62             } else {
     63                 m_isReset = false;
     64             }
     65 
     66             m_currentChild = firstChildBox();
     67         } else {
     68             m_currentChild = nextSiblingBox();
     69         }
     70     } while (!m_currentChild || m_currentChild->style()->order() != *m_orderValuesIterator);
     71 
     72     return m_currentChild;
     73 }
     74 
     75 void OrderIterator::reset()
     76 {
     77     m_currentChild = 0;
     78     m_orderValuesIterator = m_orderValues.begin();
     79     m_isReset = true;
     80 }
     81 
     82 RenderBox* OrderIterator::firstChildBox()
     83 {
     84     if (m_children.isEmpty())
     85         return m_containerBox->firstChildBox();
     86 
     87     m_childIndex = 0;
     88     return m_children[0];
     89 }
     90 
     91 RenderBox* OrderIterator::nextSiblingBox()
     92 {
     93     if (m_children.isEmpty())
     94         return m_currentChild->nextSiblingBox();
     95 
     96     if (m_childIndex >= m_children.size() - 1)
     97         return 0;
     98 
     99     return m_children[++m_childIndex];
    100 }
    101 
    102 OrderIteratorPopulator::~OrderIteratorPopulator()
    103 {
    104     m_iterator.reset();
    105 }
    106 
    107 void OrderIteratorPopulator::storeChild(RenderBox* child)
    108 {
    109     m_iterator.m_children.append(child);
    110 
    111     collectChild(child);
    112 }
    113 
    114 void OrderIteratorPopulator::collectChild(const RenderBox* child)
    115 {
    116     m_iterator.m_orderValues.insert(child->style()->order());
    117 }
    118 
    119 } // namespace WebCore
    120