/// <summary>
///
/// </summary>
/// <param name="e"></param>
protected override void OnItemDrag(ItemDragEventArgs e)
{
_selectedNode = (TreeNode) e.Item;
// Call dragstart event
if (DragStart != null)
{
DragItemEventArgs ea = new DragItemEventArgs();
ea.Node = _selectedNode;
DragStart(this, ea);
}
// Change any previous node back
if (_previousNode != null)
{
_previousNode.BackColor = BackColor;
_previousNode.ForeColor = ForeColor;
}
// Move the form with the icon/label on it
// A better width measurement algo for the form is needed here
int width = Width = _selectedNode.Text.Length*(int) _formDrag.labelText.Font.Size;
if (_selectedNode.Text.Length < 5)
width += 20;
_formDrag.Size = new Size(width, _formDrag.Height);
_formDrag.labelText.Size = new Size(width, _formDrag.labelText.Size.Height);
_formDrag.labelText.Text = _selectedNode.Text;
// Start drag drop
DoDragDrop(e.Item, _dragMode);
}
/// <summary>
///
/// </summary>
/// <param name="e"></param>
protected override void OnKeyUp(KeyEventArgs e)
{
if (e.KeyCode == Keys.Escape)
{
if (_selectedNode != null)
{
SelectedNode = _selectedNode;
}
if (_previousNode != null)
{
_previousNode.BackColor = BackColor;
_previousNode.ForeColor = ForeColor;
}
Cursor = Cursors.Default;
_formDrag.Visible = false;
// Call cancel event
if (DragCancel != null)
{
DragItemEventArgs ea = new DragItemEventArgs();
ea.Node = _selectedNode;
DragCancel(this, ea);
}
}
}
/// <summary>
///
/// </summary>
/// <param name="e"></param>
protected override void OnDragLeave(EventArgs e)
{
if (_selectedNode != null)
{
SelectedNode = _selectedNode;
}
if (_previousNode != null)
{
_previousNode.BackColor = _dragOverNodeBackColor;
_previousNode.ForeColor = _dragOverNodeForeColor;
}
_formDrag.Visible = false;
Cursor = Cursors.Default;
// Call cancel event
if (DragCancel != null)
{
DragItemEventArgs ea = new DragItemEventArgs();
ea.Node = _selectedNode;
DragCancel(this, ea);
}
}