/*
* Copyright (C) 2007 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
*/
#include "config.h"
#include "PositionIterator.h"
#include "Node.h"
#include "RenderObject.h"
#include "htmlediting.h"
namespace WebCore {
using namespace HTMLNames;
void PositionIterator::increment()
{
if (!m_parent)
return;
if (m_child) {
m_parent = m_child;
m_child = m_parent->firstChild();
m_offset = 0;
return;
}
if (!m_parent->hasChildNodes() && m_offset < maxDeepOffset(m_parent))
m_offset = m_parent->nextOffset(m_offset);
else {
m_child = m_parent;
m_parent = m_child->parentNode();
m_child = m_child->nextSibling();
m_offset = 0;
}
}
void PositionIterator::decrement()
{
if (!m_parent)
return;
if (m_child) {
m_parent = m_child->previousSibling();
if (m_parent) {
m_child = 0;
m_offset = m_parent->hasChildNodes() ? 0 : maxDeepOffset(m_parent);
} else {
m_child = m_child->parentNode();
m_parent = m_child->parentNode();
m_offset = 0;
}
return;
}
if (m_offset) {
m_offset = m_parent->previousOffset(m_offset);
} else {
if (m_parent->hasChildNodes()) {
m_parent = m_parent->lastChild();
if (!m_parent->hasChildNodes())
m_offset = maxDeepOffset(m_parent);
} else {
m_child = m_parent;
m_parent = m_parent->parentNode();
}
}
}
bool PositionIterator::atStart() const
{
if (!m_parent)
return true;
if (m_parent->parentNode())
return false;
return !m_parent->hasChildNodes() && !m_offset || m_child && !m_child->previousSibling();
}
bool PositionIterator::atEnd() const
{
if (!m_parent)
return true;
if (m_child)
return false;
return !m_parent->parentNode() && (m_parent->hasChildNodes() || m_offset >= maxDeepOffset(m_parent));
}
bool PositionIterator::atStartOfNode() const
{
if (!m_parent)
return true;
if (!m_child)
return !m_parent->hasChildNodes() && !m_offset;
return !m_child->previousSibling();
}
bool PositionIterator::atEndOfNode() const
{
if (!m_parent)
return true;
if (m_child)
return false;
return m_parent->hasChildNodes() || m_offset >= maxDeepOffset(m_parent);
}
bool PositionIterator::isCandidate() const
{
if (!m_parent)
return false;
RenderObject* renderer = m_parent->renderer();
if (!renderer)
return false;
if (renderer->style()->visibility() != VISIBLE)
return false;
if (renderer->isBR())
return !m_offset && !Position::nodeIsUserSelectNone(m_parent->parent());
if (renderer->isText())
return Position(*this).inRenderedText() && !Position::nodeIsUserSelectNone(m_parent);
if (isTableElement(m_parent) || editingIgnoresContent(m_parent))
return (atStartOfNode() || atEndOfNode()) && !Position::nodeIsUserSelectNone(m_parent->parent());
if (!m_parent->hasTagName(htmlTag) && renderer->isBlockFlow() && !Position::hasRenderedNonAnonymousDescendantsWithHeight(renderer) &&
(renderer->height() || m_parent->hasTagName(bodyTag)))
return atStartOfNode() && !Position::nodeIsUserSelectNone(m_parent);
return false;
}
} // namespace WebCore