public void SetRootNode(MyTreeNode rootNode)
{
pager.Visibility = Visibility.Hidden;
memberTreeView.Items.Clear();
ringNodeIds.Clear();
if (rootNode != null)
{
TreeViewItem rootItem = NewTreeViewItem(rootNode);
memberTreeView.Items.Add(rootItem);
//如果还有子节点，则添加一个节点，使该节点具有折叠的"+"
if (rootNode.ChildrenCount > 0)
{
rootItem.Items.Add(NewTreeViewItem(null));
}
MyTrees.OpenDB();
//判断当前根节点是否存在父节点
if (MyTrees.GetNodeBySysId(rootNode.TopId) != null)
{
btnUpLevelNode.IsEnabled = true;
btnUpRootNode.IsEnabled = true;
}
else
{
btnUpLevelNode.IsEnabled = false;
btnUpRootNode.IsEnabled = false;
}
MyTrees.CloseDB();
}
}
//显示到顶级根节点
private void btnUpRootNode_Click(object sender, RoutedEventArgs e)
{
TreeViewItem oldRootItem = memberTreeView.Items[0] as TreeViewItem;
MyTreeNode oldRootNode = oldRootItem.Tag as MyTreeNode;
MyTreeNode newRootNode = MyTrees.GetNodeBySysId(oldRootNode.TopId);
if (isRingClose(newRootNode.SysId))
{
return;
}
List <MyTreeNode> parentNodes = MyTrees.FindToRootNodeList(oldRootNode.TopId);
if (parentNodes.Count > 0)
{
//先移除旧的根节点
memberTreeView.Items.Remove(oldRootItem);
for (int i = 0; i < parentNodes.Count; i++)
{
MyTreeNode node = parentNodes[i];
//添加新的根节点
TreeViewItem newRootItem = NewTreeViewItem(parentNodes[i]);
newRootItem.IsExpanded = true;
newRootItem.Items.Add(oldRootItem);
oldRootItem = newRootItem;
}
}
memberTreeView.Items.Add(oldRootItem);
btnUpLevelNode.IsEnabled = false;
btnUpRootNode.IsEnabled = false;
}
//显示上一级节点
private void btnUpLevelNode_Click(object sender, RoutedEventArgs e)
{
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.GetNodes_ByTopId(newRootNode.SysId);
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));
}
}
//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;
}
}
