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_current(NoCurrentItemIndex)
, m_capacity(DefaultCapacity)
, m_closed(true)
, m_enabled(true)
{
ASSERT(m_page);
}
WebBackForwardList::~WebBackForwardList()
{
}
void WebBackForwardList::pageClosed()
{
if (m_page) {
size_t size = m_entries.size();
for (size_t i = 0; i < size; ++i)
m_page->backForwardRemovedItem(m_entries[i]->itemID());
}
m_page = 0;
}
void WebBackForwardList::addItem(WebBackForwardListItem* newItem)
{
ASSERT(m_current == NoCurrentItemIndex || m_current < m_entries.size());
if (!m_capacity || !m_enabled || !newItem || !m_page)
return;
Vector<RefPtr<APIObject> > removedItems;
if (m_current != NoCurrentItemIndex) {
unsigned targetSize = m_current + 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_current || m_capacity == 1)) {
m_page->backForwardRemovedItem(m_entries[0]->itemID());
removedItems.append(m_entries[0].release());
m_entries.remove(0);
m_current--;
}
} else {
size_t size = m_entries.size();
for (size_t i = 0; i < size; ++i) {
m_page->backForwardRemovedItem(m_entries[i]->itemID());
removedItems.append(m_entries[i].release());
}
m_entries.clear();
}
if (m_current == NoCurrentItemIndex)
m_current = 0;
else
m_current++;
ASSERT(m_current <= m_entries.size());
if (m_current <= m_entries.size())
m_entries.insert(m_current, newItem);
m_page->didChangeBackForwardList(newItem, &removedItems);
}
void WebBackForwardList::goToItem(WebBackForwardListItem* item)
{
ASSERT(m_current == NoCurrentItemIndex || m_current < m_entries.size());
if (!m_entries.size() || !item)
return;
unsigned index = 0;
for (; index < m_entries.size(); ++index) {
if (m_entries[index] == item)
break;
}
if (index < m_entries.size()) {
m_current = index;
if (m_page)
m_page->didChangeBackForwardList(0, 0);
}
}
WebBackForwardListItem* WebBackForwardList::currentItem()
{
ASSERT(m_current == NoCurrentItemIndex || m_current < m_entries.size());
if (m_current != NoCurrentItemIndex)
return m_entries[m_current].get();
return 0;
}
WebBackForwardListItem* WebBackForwardList::backItem()
{
ASSERT(m_current == NoCurrentItemIndex || m_current < m_entries.size());
if (m_current && m_current != NoCurrentItemIndex)
return m_entries[m_current - 1].get();
return 0;
}
WebBackForwardListItem* WebBackForwardList::forwardItem()
{
ASSERT(m_current == NoCurrentItemIndex || m_current < m_entries.size());
if (m_entries.size() && m_current < m_entries.size() - 1)
return m_entries[m_current + 1].get();
return 0;
}
WebBackForwardListItem* WebBackForwardList::itemAtIndex(int index)
{
ASSERT(m_current == NoCurrentItemIndex || m_current < m_entries.size());
if (m_current == NoCurrentItemIndex)
return 0;
if (index < -backListCount())
return 0;
if (index > forwardListCount())
return 0;
return m_entries[index + m_current].get();
}
int WebBackForwardList::backListCount()
{
ASSERT(m_current == NoCurrentItemIndex || m_current < m_entries.size());
return m_current == NoCurrentItemIndex ? 0 : m_current;
}
int WebBackForwardList::forwardListCount()
{
ASSERT(m_current == NoCurrentItemIndex || m_current < m_entries.size());
return m_current == NoCurrentItemIndex ? 0 : static_cast<int>(m_entries.size()) - (m_current + 1);
}
PassRefPtr<ImmutableArray> WebBackForwardList::backListAsImmutableArrayWithLimit(unsigned limit)
{
ASSERT(m_current == NoCurrentItemIndex || m_current < m_entries.size());
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)
vector.uncheckedAppend(m_entries[i].get());
return ImmutableArray::adopt(vector);
}
PassRefPtr<ImmutableArray> WebBackForwardList::forwardListAsImmutableArrayWithLimit(unsigned limit)
{
ASSERT(m_current == NoCurrentItemIndex || m_current < m_entries.size());
unsigned size = std::min(static_cast<unsigned>(forwardListCount()), limit);
if (!size)
return ImmutableArray::create();
Vector<RefPtr<APIObject> > vector;
vector.reserveInitialCapacity(size);
unsigned last = m_current + size;
ASSERT(last < m_entries.size());
for (unsigned i = m_current + 1; i <= last; ++i)
vector.uncheckedAppend(m_entries[i].get());
return ImmutableArray::adopt(vector);
}
void WebBackForwardList::clear()
{
ASSERT(m_current == NoCurrentItemIndex || m_current < m_entries.size());
size_t size = m_entries.size();
if (size <= 1)
return;
RefPtr<WebBackForwardListItem> currentItem = this->currentItem();
if (m_page) {
for (size_t i = 0; i < size; ++i) {
if (m_entries[i] != currentItem)
m_page->backForwardRemovedItem(m_entries[i]->itemID());
}
}
Vector<RefPtr<APIObject> > removedItems;
removedItems.reserveCapacity(m_entries.size() - 1);
for (size_t i = 0; i < m_entries.size(); ++i) {
if (i != m_current)
removedItems.append(m_entries[i].release());
}
m_current = 0;
if (currentItem) {
m_entries.shrink(1);
m_entries[0] = currentItem.release();
} else {
m_entries.clear();
m_current = NoCurrentItemIndex;
}
if (m_page)
m_page->didChangeBackForwardList(0, &removedItems);
}
}