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Diffstat (limited to 'Source/WebKit2/UIProcess/WebBackForwardList.cpp')
| -rw-r--r-- | Source/WebKit2/UIProcess/WebBackForwardList.cpp | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/Source/WebKit2/UIProcess/WebBackForwardList.cpp b/Source/WebKit2/UIProcess/WebBackForwardList.cpp new file mode 100644 index 0000000..b351418 --- /dev/null +++ b/Source/WebKit2/UIProcess/WebBackForwardList.cpp @@ -0,0 +1,208 @@ +/* + * Copyright (C) 2010 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. AND ITS CONTRIBUTORS ``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 ITS 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 "WebBackForwardList.h" + +#include "WebPageProxy.h" + +namespace WebKit { + +static const unsigned DefaultCapacity = 100; +static const unsigned NoCurrentItemIndex = UINT_MAX; + +WebBackForwardList::WebBackForwardList(WebPageProxy* page) + : m_page(page) + , m_current(NoCurrentItemIndex) + , m_capacity(DefaultCapacity) + , m_closed(true) + , m_enabled(true) +{ +} + +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) +{ + if (m_capacity == 0 || !m_enabled) + return; + + // Toss anything in the forward list + if (m_current != NoCurrentItemIndex) { + unsigned targetSize = m_current + 1; + while (m_entries.size() > targetSize) { + if (m_page) + m_page->backForwardRemovedItem(m_entries.last()->itemID()); + m_entries.removeLast(); + } + } + + // Toss the first item if the list is getting too big, as long as we're not using it + // (or even if we are, if we only want 1 entry). + if (m_entries.size() == m_capacity && (m_current != 0 || m_capacity == 1)) { + if (m_page) + m_page->backForwardRemovedItem(m_entries[0]->itemID()); + m_entries.remove(0); + m_current--; + } + + m_entries.insert(m_current + 1, newItem); + m_current++; + + if (m_page) + m_page->didChangeBackForwardList(); +} + +void WebBackForwardList::goToItem(WebBackForwardListItem* item) +{ + 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(); + } +} + +WebBackForwardListItem* WebBackForwardList::currentItem() +{ + if (m_current != NoCurrentItemIndex) + return m_entries[m_current].get(); + return 0; +} + +WebBackForwardListItem* WebBackForwardList::backItem() +{ + if (m_current && m_current != NoCurrentItemIndex) + return m_entries[m_current - 1].get(); + return 0; +} + +WebBackForwardListItem* WebBackForwardList::forwardItem() +{ + if (m_entries.size() && m_current < m_entries.size() - 1) + return m_entries[m_current + 1].get(); + return 0; +} + +WebBackForwardListItem* WebBackForwardList::itemAtIndex(int index) +{ + // Do range checks without doing math on index to avoid overflow. + if (index < -static_cast<int>(m_current)) + return 0; + + if (index > forwardListCount()) + return 0; + + return m_entries[index + m_current].get(); +} + +int WebBackForwardList::backListCount() +{ + return m_current == NoCurrentItemIndex ? 0 : m_current; +} + +int WebBackForwardList::forwardListCount() +{ + return m_current == NoCurrentItemIndex ? 0 : static_cast<int>(m_entries.size()) - (m_current + 1); +} + +PassRefPtr<ImmutableArray> WebBackForwardList::backListAsImmutableArrayWithLimit(unsigned limit) +{ + 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) +{ + 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() +{ + 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()); + } + } + + m_entries.shrink(1); + m_entries[0] = currentItem.release(); + + m_current = 0; + + if (m_page) + m_page->didChangeBackForwardList(); +} + +} // namespace WebKit |