/// <summary>
///
/// </summary>
/// <param name="e"></param>
protected override void OnDragLeave(EventArgs e)
{
if (this._selectedNode != null)
{
this.SelectedNode = this._selectedNode;
}
if (this._previousNode != null)
{
this._previousNode.BackColor = this._dragOverNodeBackColor;
this._previousNode.ForeColor = this._dragOverNodeForeColor;
}
this._formDrag.Visible = false;
this.Cursor = Cursors.Default;
// Call cancel event
if (this.DragCancel != null)
{
DragItemEventArgs ea = new DragItemEventArgs();
ea.Node = this._selectedNode;
this.DragCancel(this, ea);
}
}
/// <summary>
///
/// </summary>
/// <param name="e"></param>
protected override void OnKeyUp(KeyEventArgs e)
{
if (e.KeyCode == Keys.Escape)
{
if (this._selectedNode != null)
{
this.SelectedNode = this._selectedNode;
}
if (this._previousNode != null)
{
this._previousNode.BackColor = SystemColors.HighlightText;
this._previousNode.ForeColor = SystemColors.ControlText;
}
this.Cursor = Cursors.Default;
this._formDrag.Visible = false;
// Call cancel event
if (this.DragCancel != null)
{
DragItemEventArgs ea = new DragItemEventArgs();
ea.Node = this._selectedNode;
this.DragCancel(this, ea);
}
}
}
/// <summary>
///
/// </summary>
/// <param name="e"></param>
protected override void OnItemDrag(System.Windows.Forms.ItemDragEventArgs e)
{
this._selectedNode = (TreeNode)e.Item;
// Call dragstart event
if (this.DragStart != null)
{
DragItemEventArgs ea = new DragItemEventArgs();
ea.Node = this._selectedNode;
this.DragStart(this, ea);
}
// Change any previous node back
if (this._previousNode != null)
{
this._previousNode.BackColor = SystemColors.HighlightText;
this._previousNode.ForeColor = SystemColors.ControlText;
}
// Move the form with the icon/label on it
// A better width measurement algo for the form is needed here
int width = (int)(this._selectedNode.Text.Length * (int)this._formDrag.labelText.Font.Size * 1.5f);
if (this._selectedNode.Text.Length < 5)
{
width += 20;
}
this._formDrag.Size = new Size(width, this._formDrag.Height);
this._formDrag.labelText.Size = new Size(width, this._formDrag.labelText.Size.Height);
this._formDrag.labelText.Text = this._selectedNode.Text;
// Start drag drop
this.DoDragDrop(e.Item, this._dragMode);
}