/// <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)
{
CustomDragItemEventArgs ea = new CustomDragItemEventArgs();
foreach (TreeNode node in this.SelectedNodes)
{
ea.Nodes.Add(node);
}
this.DragCancel(this, ea);
}
}
}
/// <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)
{
CustomDragItemEventArgs ea = new CustomDragItemEventArgs();
foreach (TreeNode node in this.SelectedNodes)
{
ea.Nodes.Add(node);
}
this.DragCancel(this, ea);
}
}
private void tvUIMap_DragStart(object sender, CustomDragItemEventArgs e)
{
if ((e == null) || (e.Nodes == null))
{
return;
}
// cannot drag root node
foreach (TreeNode node in e.Nodes)
{
if (node == tvUIMap.TopNode)
{
tvUIMap.AllowDrop = false;
return;
}
}
tvUIMap.AllowDrop = true;
}
/// <summary>
///
/// </summary>
/// <param name="e"></param>
protected override void OnItemDrag(System.Windows.Forms.ItemDragEventArgs e)
{
// If the user drags a node and the node being dragged is NOT
// selected, then clear the active selection, select the
// node being dragged and drag it. Otherwise if the node being
// dragged is selected, drag the entire selection.
try
{
TreeNode node = e.Item as TreeNode;
if (node != null)
{
if (!m_SelectedNodes.Contains(node))
{
SelectSingleNode(node);
ToggleNode(node, true);
}
}
base.OnItemDrag(e);
}
catch (Exception ex)
{
HandleException(ex);
}
// DragDropTreeView
this._selectedNode = (TreeNode)e.Item;
// Call dragstart event
if (this.DragStart != null)
{
CustomDragItemEventArgs ea = new CustomDragItemEventArgs();
foreach (TreeNode node in this.SelectedNodes)
{
ea.Nodes.Add(node);
}
ea.UIMapFile = this.UIMapFile;
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 = this._selectedNode.Text.Length * (int)this._formDrag.labelText.Font.Size;
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
DragData dragData = new DragData();
dragData.UIMapFile = this.UIMapFile;
foreach (TreeNode node in this.SelectedNodes)
{
dragData.Nodes.Add(node);
}
this.DoDragDrop(dragData, _dragMode);
}