void PageManager::changePage(const std::string &pageName)
{
// close last page.
auto page = getPage(pageName);
if ( pageName == currentPageName_ || !page )
{
return;
}
currentPageName_ = pageName;
auto newState = dynamic_cast<State<RootPage>*>( page );
if ( stateMachineRef_ )
{
stateMachineRef_->changeState(newState);
}
// add page as child of MainScene's middle layer
auto middleLayer = rootPage()->_middleLayer;
if ( middleLayer )
{
middleLayer->removeAllChildren();
middleLayer->addChild(page);
}
bool shouldShowTestBtn = ("MainPage" != currentPageName_);
rootPage()->_preTestBtn ?
rootPage()->_preTestBtn->setVisible(shouldShowTestBtn) : void(0);
rootPage()->_nextTestBtn ?
rootPage()->_nextTestBtn->setVisible(shouldShowTestBtn) : void(0);
}
void BTree::trace(const Key& key, std::vector<int>* tr, bool& found, PageDB::Location& loc) {
const Node* node;
int currentPage = rootPage();
while (true) {
if (tr)
tr->push_back(currentPage);
PageDB::PageSession session = pgdb->GetSession(file, currentPage);
node = reinterpret_cast<const Node*>(session.buf());
if (node->size == 0) {
found = false;
break;
}
int idx = node->findIndex(key);
auto locX = node->children[idx].loc;
if (locX.Page != 0) {
if (node->children[idx].less == key) {
found = true;
loc = locX;
break;
} else {
found = false;
break;
}
} else {
currentPage = locX.Offset;
}
}
}
void BTree::insertCore(Key key, std::vector<int>& trace, PageDB::Location loc) {
Node *currentNode, *splitNode;
int sp = trace.size() - 1;
for(; sp > -1; sp--) {
PageDB::PageWriteSession session1 = pgdb->GetWriteSession(file, trace[sp]);
currentNode = reinterpret_cast<Node*>(session1.buf());
if (currentNode->size != MinChild * 2) {
currentNode->Insert(key, loc);
break;
}
int newPage = file->newPage();
PageDB::PageWriteSession session2 = pgdb->GetWriteSession(file, newPage);
splitNode = reinterpret_cast<Node*>(session2.buf());
currentNode->InsertAndSplit(key, loc, *splitNode);
loc.Page = 0;
loc.Offset = newPage;
key = splitNode->children[0].less;
}
if (sp == -1) {
int newPage = file->newPage();
PageDB::PageWriteSession session = pgdb->GetWriteSession(file, newPage);
currentNode = reinterpret_cast<Node*>(session.buf());
currentNode->size = 2;
currentNode->children[0].less = Key(INT_MIN, INT_MIN, INT_MIN);
currentNode->children[0].loc = PageDB::Location(0, trace[0]);
currentNode->children[1].less = key;
currentNode->children[1].loc = loc;
rootPage() = newPage;
entrySession.flush();
}
}
void PageManager::changeBackGround(const std::string &pic)
{
auto backLlayer = rootPage()->_backLayer;
if ( backLlayer )
{
backLlayer->removeAllChildren();
if ( pic.empty() )
{
// empty pic name will delete the background.
return;
}
auto background = CCSprite::create(pic.c_str());
if ( !background )
{
// invalid pic name will delete the background.
return;
}
auto size = background->getContentSize();
auto winSize = CocosWindow::size();
background->setScaleX(winSize.width / size.width);
background->setScaleY(winSize.height / size.height);
background->setPosition(CocosWindow::center());
backLlayer->addChild(background);
}
}
void BTree::removeCore(Key key, std::vector<int>& trace) {
Node *parent;
PageDB::PageWriteSession parentSession = pgdb->GetWriteSession(file, trace.back());
parent = reinterpret_cast<Node*>(parentSession.buf());
int sp;
int idx = parent->findIndex(key);
for (sp = trace.size() - 1; sp > 0; sp--) {
Node* child = parent;
child->Remove(idx);
if (child->size >= MinChild) {
break;
}
PageDB::PageWriteSession childSession = std::move(parentSession);
parentSession = pgdb->GetWriteSession(file, trace[sp - 1]);
parent = reinterpret_cast<Node*>(parentSession.buf());
idx = parent->findIndex(child->children[0].less);
if (idx > 0) {
//Left
PageDB::PageWriteSession siblingSession = pgdb->GetWriteSession(file, parent->children[idx - 1].loc.Offset);
Node* sibling = reinterpret_cast<Node*>(siblingSession.buf());
if (sibling->size > MinChild) {
auto item = sibling->children[sibling->size - 1];
child->Insert(item.less, item.loc);
sibling->Remove(sibling->size - 1);
parent->children[idx].less = child->children[0].less;
break;
}
//Merge
sibling->Merge(*child);
childSession.Release();
pgdb->RemovePage(file, trace[sp]);
} else {
//Right
PageDB::PageWriteSession siblingSession = pgdb->GetWriteSession(file, parent->children[idx + 1].loc.Offset);
Node* sibling = reinterpret_cast<Node*>(siblingSession.buf());
if (sibling->size > MinChild) {
auto item = sibling->children[0];
child->Insert(item.less, item.loc);
sibling->Remove(0);
parent->children[idx + 1].less = sibling->children[0].less;
break;
}
//Merge
child->Merge(*sibling);
siblingSession.Release();
pgdb->RemovePage(file, parent->children[idx + 1].loc.Offset);
idx++;
}
}
if (sp == 0) {
parent->Remove(idx);
if (parent->size == 1 && parent->children[0].loc.Page == 0) {
rootPage() = parent->children[0].loc.Offset;
parentSession.Release();
entrySession.flush();
}
}
}
void PageManager::init()
{
registerPage("RootPage", rootPage());
registerPage("MainPage", MainPage::create());
MessageCenter::getInstance()->registerHanlder(
MessageType::kMessageTypeChangePage, this, -1);
MessageCenter::getInstance()->registerHanlder(
MessageType::kMessageTypeChangeBackground, this, -1);
}
QWidget *VBoxSettingsToolBarSelector::rootPage (int aId) const
{
QWidget *page = NULL;
if (SelectorActionItem *item = findActionItem (aId))
{
if (item->parentId() > -1)
page = rootPage (item->parentId());
else if (item->page())
page = item->page();
else
page = item->tabWidget();
}
return page;
}
void BTree::initBTree() {
magicNumber() = MagicNumber;
int rtPage = file->newPage();
int infoPage = file->newPage();
file->eof.Page = infoPage;
file->eof.Offset = sizeof(Information);
file->writebackFileHeaderCore();
rootPage() = rtPage;
usedRecord() = 0;
avalibleRecord() = 0;
linkHeadPage() = infoPage;
linkHeadOffset() = 0;
PageDB::PageWriteSession s = pgdb->GetWriteSession(file, infoPage);
Information* info = reinterpret_cast<Information*>(s.buf());
info->next = info->prev = PageDB::Location(infoPage, 0);
entrySession.flush();
}
PageManager::PageManager() : stateMachineRef_(rootPage()->_stateMachine)
{}