/// <summary>
/// Called when the underlying tree control raises the DragOver event</summary>
/// <param name="e">Event args from the tree control's DragOver event</param>
protected virtual void OnDragOver(DragEventArgs e)
{
bool canInsert = false;
if (TreeControl.DragBetween)
{
TreeControl.Node parent, before;
Point clientPoint = TreeControl.PointToClient(new Point(e.X, e.Y));
if (TreeControl.GetInsertionNodes(clientPoint, out parent, out before))
{
canInsert = ApplicationUtil.CanInsertBetween(
m_treeControlAdapter.TreeView,
parent != null ? parent.Tag : null,
before != null ? before.Tag : null,
e.Data);
}
}
else
{
canInsert = ApplicationUtil.CanInsert(
m_treeControlAdapter.TreeView,
m_treeControlAdapter.LastHit,
e.Data);
}
e.Effect = canInsert ? DragDropEffects.Move : DragDropEffects.None;
// A refresh is required to display the drag-between cue.
if (TreeControl.ShowDragBetweenCue)
{
TreeControl.Invalidate();
}
}
/// <summary>
/// Called when the underlying tree control raises the DragDrop event</summary>
/// <param name="e">Event args from the tree control's DragDrop event</param>
protected virtual void OnDragDrop(DragEventArgs e)
{
if (TreeControl.DragBetween)
{
TreeControl.Node parent, before;
Point clientPoint = TreeControl.PointToClient(new Point(e.X, e.Y));
if (TreeControl.GetInsertionNodes(clientPoint, out parent, out before))
{
ApplicationUtil.InsertBetween(
m_treeControlAdapter.TreeView,
parent != null ? parent.Tag : null,
before != null ? before.Tag : null,
e.Data,
"Drag and Drop",
m_statusService);
}
}
else
{
ApplicationUtil.Insert(
m_treeControlAdapter.TreeView,
m_treeControlAdapter.LastHit,
e.Data,
"Drag and Drop",
m_statusService);
}
if (!TreeControl.ShowDragBetweenCue)
{
return;
}
TreeControl.Invalidate();
}