/// <summary>
/// This event is fired when the user drags over a drag and drop control with the mouse.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void fileSystemTreeView_DragOver(object sender, DragEventArgs e)
{
//Console.WriteLine("dragover");
// Compute drag position and move image
Point position = this.fileSystemTreeView.PointToClient(new Point(e.X, e.Y));
DragHelper.ImageList_DragMove(position.X - this.fileSystemTreeView.Left, position.Y - this.fileSystemTreeView.Top);
// Get actual drop node
TreeNode dropNode = this.fileSystemTreeView.GetNodeAt(position);
if (dropNode == null)
{
e.Effect = DragDropEffects.None;
return;
}
//if ((e.KeyState & 8) == 8) //ctrl - copy
//{
// ShowToolTip(position.X, position.Y, "Copy to ");
//}
//else
//{
// ShowToolTip(position.X, position.Y, "Move to ");
//}
e.Effect = DragDropEffects.Move;
// if mouse is on a new node select it
if (this.tempDropNode != dropNode)
{
DragHelper.ImageList_DragShowNolock(false);
this.fileSystemTreeView.SelectedNode = dropNode;
DragHelper.ImageList_DragShowNolock(true);
tempDropNode = dropNode;
}
// Avoid that drop node is child of drag node
TreeNode tmpNode = dropNode;
while (tmpNode.Parent != null)
{
if (tmpNode.Parent == this.dragNode)
{
e.Effect = DragDropEffects.None;
}
tmpNode = tmpNode.Parent;
}
}
/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void scrollTimer_Tick(object sender, EventArgs e)
{
// get node at mouse position
Point pt = this.fileSystemTreeView.PointToClient(Control.MousePosition);
TreeNode node = this.fileSystemTreeView.GetNodeAt(pt);
if (node == null)
{
return;
}
// if mouse is near to the top, scroll up
if (pt.Y < 30)
{
// set actual node to the upper one
if (node.PrevVisibleNode != null)
{
node = node.PrevVisibleNode;
// hide drag image
DragHelper.ImageList_DragShowNolock(false);
// scroll and refresh
node.EnsureVisible();
this.fileSystemTreeView.Refresh();
// show drag image
DragHelper.ImageList_DragShowNolock(true);
}
}
// if mouse is near to the bottom, scroll down
else if (pt.Y > this.fileSystemTreeView.Size.Height - 30)
{
if (node.NextVisibleNode != null)
{
node = node.NextVisibleNode;
DragHelper.ImageList_DragShowNolock(false);
node.EnsureVisible();
this.fileSystemTreeView.Refresh();
DragHelper.ImageList_DragShowNolock(true);
}
}
}
