third_party/WebKit/Source/core/layout/OrderIterator.cpp

   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/layout/OrderIterator.h"
  33
  34 #include "core/layout/LayoutBox.h"
  35
  36 namespace blink {
  37
  38 OrderIterator::OrderIterator(const LayoutBox* containerBox)
  39     : m_containerBox(containerBox)
  40     , m_currentChild(nullptr)
  41     , m_isReset(false)
  42 {
  43 }
  44
  45 LayoutBox* OrderIterator::first()
  46 {
  47     reset();
  48     return next();
  49 }
  50
  51 LayoutBox* OrderIterator::next()
  52 {
  53     do {
  54         if (!m_currentChild) {
  55             if (m_orderValuesIterator == m_orderValues.end())
  56                 return nullptr;
  57
  58             if (!m_isReset) {
  59                 ++m_orderValuesIterator;
  60                 if (m_orderValuesIterator == m_orderValues.end())
  61                     return nullptr;
  62             } else {
  63                 m_isReset = false;
  64             }
  65
  66             m_currentChild = m_containerBox->firstChildBox();
  67         } else {
  68             m_currentChild = 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 = nullptr;
  78     m_orderValuesIterator = m_orderValues.begin();
  79     m_isReset = true;
  80 }
  81
  82 OrderIteratorPopulator::~OrderIteratorPopulator()
  83 {
  84     m_iterator.reset();
  85 }
  86
  87 void OrderIteratorPopulator::collectChild(const LayoutBox* child)
  88 {
  89     m_iterator.m_orderValues.insert(child->style()->order());
  90 }
  91
  92 } // namespace blink