// We now traverse the frame tree and item tree a second time, loading frames that
// do have the content the item requests.
void HistoryController::recursiveGoToItem(HistoryItem* item, HistoryItem* fromItem, FrameLoadType type)
{
ASSERT(item);
ASSERT(fromItem);
if (itemsAreClones(item, fromItem)) {
// Just iterate over the rest, looking for frames to navigate.
const HistoryItemVector& childItems = item->children();
int size = childItems.size();
for (int i = 0; i < size; ++i) {
String childFrameName = childItems[i]->target();
HistoryItem* fromChildItem = fromItem->childItemWithTarget(childFrameName);
ASSERT(fromChildItem);
Frame* childFrame = m_frame->tree()->child(childFrameName);
ASSERT(childFrame);
childFrame->loader()->history()->recursiveGoToItem(childItems[i].get(), fromChildItem, type);
}
} else {
m_frame->loader()->loadItem(item, type);
}
}
// The general idea here is to traverse the frame tree and the item tree in parallel,
// tracking whether each frame already has the content the item requests. If there is
// a match, we set the provisional item and recurse. Otherwise we will reload that
// frame and all its kids in recursiveGoToItem.
void HistoryController::recursiveSetProvisionalItem(HistoryItem* item, HistoryItem* fromItem, FrameLoadType type)
{
ASSERT(item);
if (itemsAreClones(item, fromItem)) {
// Set provisional item, which will be committed in recursiveUpdateForCommit.
m_provisionalItem = item;
const HistoryItemVector& childItems = item->children();
int size = childItems.size();
for (int i = 0; i < size; ++i) {
String childFrameName = childItems[i]->target();
HistoryItem* fromChildItem = fromItem->childItemWithTarget(childFrameName);
ASSERT(fromChildItem);
Frame* childFrame = m_frame->tree()->child(childFrameName);
ASSERT(childFrame);
childFrame->loader()->history()->recursiveSetProvisionalItem(childItems[i].get(), fromChildItem, type);
}
}
}
void HistoryController::recursiveUpdateForCommit()
{
// The frame that navigated will now have a null provisional item.
// Ignore it and its children.
if (!m_provisionalItem)
return;
// For each frame that already had the content the item requested (based on
// (a matching URL and frame tree snapshot), just restore the scroll position.
// Save form state (works from currentItem, since m_frameLoadComplete is true)
if (m_currentItem && itemsAreClones(m_currentItem.get(), m_provisionalItem.get())) {
ASSERT(m_frameLoadComplete);
saveDocumentState();
saveScrollPositionAndViewStateToItem(m_currentItem.get());
saveTextWrapWidth(m_currentItem.get());
if (FrameView* view = m_frame->view())
view->setWasScrolledByUser(false);
// Now commit the provisional item
m_frameLoadComplete = false;
m_previousItem = m_currentItem;
m_currentItem = m_provisionalItem;
m_provisionalItem = 0;
// Restore form state (works from currentItem)
restoreDocumentState();
// Restore the scroll position (we choose to do this rather than going back to the anchor point)
restoreScrollPositionAndViewState();
restoreTextWrapWidth();
}
// Iterate over the rest of the tree
for (Frame* child = m_frame->tree()->firstChild(); child; child = child->tree()->nextSibling())
child->loader()->history()->recursiveUpdateForCommit();
}