//节点太多，点击加载更多未显示的节点
void moreNode_Load(object sender, RoutedEventArgs e)
{
TreeViewItem moreItem = sender as TreeViewItem;
MyTreeNode node = moreItem.Tag as MyTreeNode;
TreeViewItem parentItem = moreItem.Parent as TreeViewItem;
if (parentItem != null)
{
parentItem.Items.Remove(moreItem);
MyTrees.OpenDB();
List <MyTreeNode> childrenNodes = MyTrees.GetNodesByTopIdPage(node.TopId, node.ChildrenCount);
MyTrees.CloseDB();
foreach (MyTreeNode subNode in childrenNodes)
{
TreeViewItem subItem = NewTreeViewItem(subNode);
parentItem.Items.Add(subItem);
//如果子节点还有孙子节点，则添加一个虚假的孙节点，使该子节点具有折叠的"+"
if (subNode.ChildrenCount > 0)
{
subItem.Items.Add(NewTreeViewItem(null));
}
WindowView.notify.SetStatusMessage("正在展开节点" + subItem.Header);
}
//表示分页加载更多的节点
node.ChildrenCount = node.ChildrenCount + MyTrees.getNodePageSize;
if (node.ChildrenCount < node.ChildrenCountAll)
{
parentItem.Items.Add(NewTreeViewItem(node));
}
}
}
void item_Expanded(object sender, RoutedEventArgs e)
{
TreeViewItem item = e.Source as TreeViewItem;
if (item.HasItems && (item.Items[0] as TreeViewItem).Header.ToString() == "none")
{
//先移除为使该节点具有折叠的"+"而添加的虚假的子节点
item.Items.Clear();
if ((e.Source as TreeViewItem).IsSelected)
{
MyTrees.OpenDB();
}
MyTreeNode node = item.Tag as MyTreeNode;
List <MyTreeNode> childrenNodes = MyTrees.GetNodesByTopIdPage(node.SysId, 0);
foreach (MyTreeNode subNode in childrenNodes)
{
TreeViewItem subItem = NewTreeViewItem(subNode);
item.Items.Add(subItem);
//如果子节点还有孙子节点，则添加一个虚假的孙节点，使该子节点具有折叠的"+"
if (subNode.ChildrenCount > 0)
{
subItem.Items.Add(NewTreeViewItem(null));
}
WindowView.notify.SetStatusMessage("正在展开节点" + subItem.Header);
}
//表示分页加载更多的节点
if (node.ChildrenCount > MyTrees.getNodePageSize)
{
MyTreeNode moreNode = new MyTreeNode();
moreNode.SysId = "moreNode";
moreNode.Name = node.Name;
moreNode.TopId = node.SysId;
moreNode.ChildrenCount = MyTrees.getNodePageSize;
moreNode.ChildrenCountAll = node.ChildrenCount;
item.Items.Add(NewTreeViewItem(moreNode));
}
if ((e.Source as TreeViewItem).IsSelected)
{
MyTrees.CloseDB();
}
}
}
//显示上一级节点
private void btnUpLevelNode_Click(object sender, RoutedEventArgs e)
{
MyTrees.OpenDB();
TreeViewItem oldRootItem = memberTreeView.Items[0] as TreeViewItem;
MyTreeNode oldRootNode = oldRootItem.Tag as MyTreeNode;
MyTreeNode newRootNode = MyTrees.GetNodeBySysId(oldRootNode.TopId);
if (isRingClose(newRootNode.SysId))
{
return;
}
//先移除旧的根节点
memberTreeView.Items.Remove(oldRootItem);
//添加新的根节点
TreeViewItem newRootItem = NewTreeViewItem(newRootNode);
memberTreeView.Items.Add(newRootItem);
newRootItem.IsExpanded = true;
//新的根节点添加子节点
List <MyTreeNode> childrenNodes = MyTrees.GetNodesByTopIdPage(newRootNode.SysId, 0);
bool hasNotAdded = true;
foreach (MyTreeNode subNode in childrenNodes)
{
if (hasNotAdded)
{
if (oldRootNode.SysId == subNode.SysId)
{
newRootItem.Items.Add(oldRootItem);
hasNotAdded = false;
continue;
}
}
TreeViewItem subItem = NewTreeViewItem(subNode);
newRootItem.Items.Add(subItem);
//如果子节点还有孙子节点，则添加一个虚假的孙节点，使该子节点具有折叠的"+"
if (subNode.ChildrenCount > 0)
{
subItem.Items.Add(NewTreeViewItem(null));
}
}
//表示分页加载更多的节点
if (newRootNode.ChildrenCount > MyTrees.getNodePageSize)
{
MyTreeNode moreNode = new MyTreeNode();
moreNode.SysId = "moreNode";
moreNode.Name = newRootNode.Name;
moreNode.TopId = newRootNode.SysId;
moreNode.ChildrenCount = MyTrees.getNodePageSize;
moreNode.ChildrenCountAll = newRootNode.ChildrenCount;
newRootItem.Items.Add(NewTreeViewItem(moreNode));
}
//判断当前根节点是否存在父节点
if (MyTrees.GetNodeBySysId(newRootNode.TopId) != null)
{
btnUpLevelNode.IsEnabled = true;
btnUpRootNode.IsEnabled = true;
}
else
{
btnUpLevelNode.IsEnabled = false;
btnUpRootNode.IsEnabled = false;
}
MyTrees.CloseDB();
}