WebBackForwardList.cpp [plain text]
#include "config.h"
#include "WebBackForwardList.h"
#include "WebPageProxy.h"
namespace WebKit {
static const unsigned DefaultCapacity = 100;
WebBackForwardList::WebBackForwardList(WebPageProxy* page)
: m_page(page)
, m_hasCurrentIndex(false)
, m_currentIndex(0)
, m_capacity(DefaultCapacity)
{
ASSERT(m_page);
}
WebBackForwardList::~WebBackForwardList()
{
ASSERT((!m_page && !m_hasCurrentIndex) || !m_page->isValid());
}
void WebBackForwardList::pageClosed()
{
ASSERT(m_page);
if (m_page) {
size_t size = m_entries.size();
for (size_t i = 0; i < size; ++i) {
ASSERT(m_entries[i]);
if (!m_entries[i])
continue;
m_page->backForwardRemovedItem(m_entries[i]->itemID());
}
}
m_page = 0;
m_entries.clear();
m_hasCurrentIndex = false;
}
void WebBackForwardList::addItem(WebBackForwardListItem* newItem)
{
ASSERT(!m_hasCurrentIndex || m_currentIndex < m_entries.size());
if (!m_capacity || !newItem || !m_page)
return;
Vector<RefPtr<APIObject>> removedItems;
if (m_hasCurrentIndex) {
unsigned targetSize = m_currentIndex + 1;
removedItems.reserveCapacity(m_entries.size() - targetSize);
while (m_entries.size() > targetSize) {
m_page->backForwardRemovedItem(m_entries.last()->itemID());
removedItems.append(m_entries.last().release());
m_entries.removeLast();
}
if (m_entries.size() == m_capacity && (m_currentIndex || m_capacity == 1)) {
m_page->backForwardRemovedItem(m_entries[0]->itemID());
removedItems.append(m_entries[0].release());
m_entries.remove(0);
if (m_entries.isEmpty())
m_hasCurrentIndex = false;
else
m_currentIndex--;
}
} else {
ASSERT(m_entries.isEmpty());
size_t size = m_entries.size();
for (size_t i = 0; i < size; ++i) {
ASSERT(m_entries[i]);
if (!m_entries[i])
continue;
m_page->backForwardRemovedItem(m_entries[i]->itemID());
removedItems.append(m_entries[i].release());
}
m_entries.clear();
}
if (!m_hasCurrentIndex) {
ASSERT(m_entries.isEmpty());
m_currentIndex = 0;
m_hasCurrentIndex = true;
} else
m_currentIndex++;
ASSERT(m_currentIndex <= m_entries.size());
if (m_currentIndex <= m_entries.size())
m_entries.insert(m_currentIndex, newItem);
m_page->didChangeBackForwardList(newItem, &removedItems);
}
void WebBackForwardList::goToItem(WebBackForwardListItem* item)
{
ASSERT(!m_hasCurrentIndex || m_currentIndex < m_entries.size());
if (!m_entries.size() || !item || !m_page || !m_hasCurrentIndex)
return;
unsigned index = 0;
for (; index < m_entries.size(); ++index) {
if (m_entries[index] == item)
break;
}
if (index < m_entries.size()) {
m_currentIndex = index;
m_page->didChangeBackForwardList(0, 0);
}
}
WebBackForwardListItem* WebBackForwardList::currentItem()
{
ASSERT(!m_hasCurrentIndex || m_currentIndex < m_entries.size());
return m_page && m_hasCurrentIndex ? m_entries[m_currentIndex].get() : 0;
}
WebBackForwardListItem* WebBackForwardList::backItem()
{
ASSERT(!m_hasCurrentIndex || m_currentIndex < m_entries.size());
return m_page && m_hasCurrentIndex && m_currentIndex ? m_entries[m_currentIndex - 1].get() : 0;
}
WebBackForwardListItem* WebBackForwardList::forwardItem()
{
ASSERT(!m_hasCurrentIndex || m_currentIndex < m_entries.size());
return m_page && m_hasCurrentIndex && m_entries.size() && m_currentIndex < m_entries.size() - 1 ? m_entries[m_currentIndex + 1].get() : 0;
}
WebBackForwardListItem* WebBackForwardList::itemAtIndex(int index)
{
ASSERT(!m_hasCurrentIndex || m_currentIndex < m_entries.size());
if (!m_hasCurrentIndex || !m_page)
return 0;
if (index < -backListCount())
return 0;
if (index > forwardListCount())
return 0;
return m_entries[index + m_currentIndex].get();
}
int WebBackForwardList::backListCount() const
{
ASSERT(!m_hasCurrentIndex || m_currentIndex < m_entries.size());
return m_page && m_hasCurrentIndex ? m_currentIndex : 0;
}
int WebBackForwardList::forwardListCount() const
{
ASSERT(!m_hasCurrentIndex || m_currentIndex < m_entries.size());
return m_page && m_hasCurrentIndex ? m_entries.size() - (m_currentIndex + 1) : 0;
}
PassRefPtr<ImmutableArray> WebBackForwardList::backListAsImmutableArrayWithLimit(unsigned limit) const
{
ASSERT(!m_hasCurrentIndex || m_currentIndex < m_entries.size());
if (!m_page || !m_hasCurrentIndex)
return ImmutableArray::create();
unsigned backListSize = static_cast<unsigned>(backListCount());
unsigned size = std::min(backListSize, limit);
if (!size)
return ImmutableArray::create();
Vector<RefPtr<APIObject>> vector;
vector.reserveInitialCapacity(size);
ASSERT(backListSize >= size);
for (unsigned i = backListSize - size; i < backListSize; ++i) {
ASSERT(m_entries[i]);
vector.uncheckedAppend(m_entries[i].get());
}
return ImmutableArray::adopt(vector);
}
PassRefPtr<ImmutableArray> WebBackForwardList::forwardListAsImmutableArrayWithLimit(unsigned limit) const
{
ASSERT(!m_hasCurrentIndex || m_currentIndex < m_entries.size());
if (!m_page || !m_hasCurrentIndex)
return ImmutableArray::create();
unsigned size = std::min(static_cast<unsigned>(forwardListCount()), limit);
if (!size)
return ImmutableArray::create();
Vector<RefPtr<APIObject>> vector;
vector.reserveInitialCapacity(size);
unsigned last = m_currentIndex + size;
ASSERT(last < m_entries.size());
for (unsigned i = m_currentIndex + 1; i <= last; ++i) {
ASSERT(m_entries[i]);
vector.uncheckedAppend(m_entries[i].get());
}
return ImmutableArray::adopt(vector);
}
void WebBackForwardList::clear()
{
ASSERT(!m_hasCurrentIndex || m_currentIndex < m_entries.size());
size_t size = m_entries.size();
if (!m_page || size <= 1)
return;
RefPtr<WebBackForwardListItem> currentItem = this->currentItem();
Vector<RefPtr<APIObject>> removedItems;
if (!currentItem) {
ASSERT(!m_hasCurrentIndex);
for (size_t i = 0; i < size; ++i) {
ASSERT(m_entries[i]);
if (!m_entries[i])
continue;
m_page->backForwardRemovedItem(m_entries[i]->itemID());
removedItems.append(m_entries[i].release());
}
m_entries.clear();
m_hasCurrentIndex = false;
m_page->didChangeBackForwardList(0, &removedItems);
return;
}
for (size_t i = 0; i < size; ++i) {
ASSERT(m_entries[i]);
if (m_entries[i] && m_entries[i] != currentItem)
m_page->backForwardRemovedItem(m_entries[i]->itemID());
}
removedItems.reserveCapacity(size - 1);
for (size_t i = 0; i < size; ++i) {
if (i != m_currentIndex && m_hasCurrentIndex && m_entries[i])
removedItems.append(m_entries[i].release());
}
m_currentIndex = 0;
if (currentItem) {
m_entries.shrink(1);
m_entries[0] = currentItem.release();
} else {
m_entries.clear();
m_hasCurrentIndex = false;
}
m_page->didChangeBackForwardList(0, &removedItems);
}
}