private void trvMain_DragDrop(object sender, DragEventArgs e)
{
if (!e.Data.GetDataPresent(typeof(TreeNode)))
{
return;
}
TreeNode node = (TreeNode)e.Data.GetData(typeof(TreeNode));
Controller item = (Controller)node.Tag;
Point droppoint = trvMain.PointToClient(new Point(e.X, e.Y));
TreeNode dropnode = trvMain.GetNodeAt(droppoint);
if (dropnode == null)
{
return;
}
if (node.TreeView != dropnode.TreeView)
{
return;
}
Controller destination = (Controller)dropnode.Tag;
if (item == destination)
{
return;
}
item.Move(destination, true);
item.Node.EnsureVisible();
trvMain.SelectedNode = item.Node;
}
private void trvMain_DragOver(object sender, DragEventArgs e)
{
if (!e.Data.GetDataPresent(typeof(TreeNode)))
{
e.Effect = DragDropEffects.None;
return;
}
TreeNode node = (TreeNode)e.Data.GetData(typeof(TreeNode));
Controller item = (Controller)node.Tag;
Point droppoint = trvMain.PointToClient(new Point(e.X, e.Y));
TreeNode dropnode = trvMain.GetNodeAt(droppoint);
if (dropnode == null)
{
e.Effect = DragDropEffects.None;
return;
}
if (node.TreeView != dropnode.TreeView)
{
e.Effect = DragDropEffects.None;
return;
}
Controller destination = (Controller)dropnode.Tag;
if (item == destination)
{
e.Effect = DragDropEffects.None;
return;
}
if (item.Move(destination, false))
{
e.Effect = DragDropEffects.Move;
}
else
{
e.Effect = DragDropEffects.None;
}
}