private void CategoryTree_DragOver(object sender, DragEventArgs e)
{
Point targetPoint = CategoryTree.PointToClient(new Point(e.X, e.Y));
CategoryTree.SelectedNode = CategoryTree.GetNodeAt(targetPoint);
}
private void CategoryTree_DragDrop(object sender, DragEventArgs e)
{
// 获取拖拽到的节点
Point targetPoint = CategoryTree.PointToClient(new Point(e.X, e.Y));
TreeNode targetNode = CategoryTree.GetNodeAt(targetPoint);
// 获取被拖拽得节点
if (e.Data.GetDataPresent(typeof(List <Book>)))
{
List <Book> books = (List <Book>)e.Data.GetData(typeof(List <Book>));
if (targetNode.Tag is KeywordAndUser)
{
Keywords k = ((KeywordAndUser)targetNode.Tag).Keyword;
for (int i = 0; i < books.Count; i++)
{
JianLiLinq.Default.BookMarkKeyword(books[i], k);
}
db.SubmitChanges();
if (AfterSelectKeyword != null)
{
AfterSelectKeyword(k);
}
}
}
else if (e.Data.GetDataPresent(typeof(TreeNode)))
{
TreeNode draggedNode = (TreeNode)e.Data.GetData(typeof(TreeNode));
// 不能在关键词之下建立类别
if (targetNode.Tag is KeywordAndUser)
{
return;
}
if (ContainsNode(draggedNode, targetNode))
{
if (draggedNode.Parent != null)
{
draggedNode.Parent.Expand();
}
return;
}
// 处理被移动的关键字
if (draggedNode.Tag is KeywordAndUser)
{
if (!draggedNode.Equals(targetNode))
{
Keywords k = ((KeywordAndUser)draggedNode.Tag).Keyword;
k.CategoryId = ((Categories)(targetNode.Tag)).CategoryID;
db.SubmitChanges();
draggedNode.Remove();
// 父节点完成初始化
if (targetNode.Nodes.Count == 1 && targetNode.Nodes[0].Text == "占位")
{
CreateSonNode(targetNode);
}
else
{
targetNode.Nodes.Add(draggedNode);
}
}
}
else if (draggedNode.Tag is Categories)
{
if (!draggedNode.Equals(targetNode))
{
Categories c = (Categories)(draggedNode.Tag);
c.CategoryParent = ((Categories)(targetNode.Tag)).CategoryID;
db.SubmitChanges();
draggedNode.Remove();
// 父节点完成初始化
if (targetNode.Nodes.Count == 1 && targetNode.Nodes[0].Text == "占位")
{
CreateSonNode(targetNode);
}
else
{
targetNode.Nodes.Add(draggedNode);
}
}
}
draggedNode.Parent.Expand();
}
}
