/// <summary>
/// Occurs when the <see cref="E:System.Windows.Forms.TreeView.NodeMouseClick"></see> event is fired
/// -- that is, when a node in the tree view is clicked.
/// </summary>
/// <param name="e">A <see cref="T:System.Windows.Forms.TreeNodeMouseClickEventArgs"></see> that contains the event data.</param>
protected override void OnNodeMouseClick(TreeNodeMouseClickEventArgs e)
{
// Are we dealing with a dropdown node?
if (e.Node is DropDownTreeNode)
{
this.m_CurrentNode = (DropDownTreeNode)e.Node;
// Need to add the node's ComboBox to the TreeView's list of controls for it to work
this.Controls.Add(this.m_CurrentNode.ComboBox);
// Set the bounds of the ComboBox, with a little adjustment to make it look right
this.m_CurrentNode.ComboBox.SetBounds(
this.m_CurrentNode.Bounds.X - 1,
this.m_CurrentNode.Bounds.Y - 2,
this.m_CurrentNode.Bounds.Width + 25,
this.m_CurrentNode.Bounds.Height);
// Listen to the SelectedValueChanged event of the node's ComboBox
this.m_CurrentNode.ComboBox.SelectedValueChanged += new EventHandler(ComboBox_SelectedValueChanged);
this.m_CurrentNode.ComboBox.DropDownClosed += new EventHandler(ComboBox_DropDownClosed);
// Now show the ComboBox
this.m_CurrentNode.ComboBox.Show();
this.m_CurrentNode.ComboBox.DroppedDown = true;
}
base.OnNodeMouseClick(e);
}
/// <summary>
/// Method to hide the currently-selected node's ComboBox
/// </summary>
private void HideComboBox()
{
if (this.m_CurrentNode != null)
{
// Unregister the event listener
this.m_CurrentNode.ComboBox.SelectedValueChanged -= ComboBox_SelectedValueChanged;
this.m_CurrentNode.ComboBox.DropDownClosed -= ComboBox_DropDownClosed;
// Copy the selected text from the ComboBox to the TreeNode
this.m_CurrentNode.Text = this.m_CurrentNode.ComboBox.Text;
// Hide the ComboBox
this.m_CurrentNode.ComboBox.Hide();
this.m_CurrentNode.ComboBox.DroppedDown = false;
// Remove the control from the TreeView's list of currently-displayed controls
this.Controls.Remove(this.m_CurrentNode.ComboBox);
// And return to the default state (no ComboBox displayed)
this.m_CurrentNode = null;
}
}