Treeview - (single and multi column) Ignore auto-expand on double-click

[Administrator]

When you double-click a node with children, it expands/collapses before the double-click event is fired so I can find no way to cancel the expand. Is there a property/method I can use to turn off the double-click to expand node, I only want to expand using the +/- images.

[Nandakumar R]

Hi,

Please refer to the following code and sample for how this can be done.

[C#]
        void treeViewAdv1_BeforeExpand(object sender, Syncfusion.Windows.Forms.Tools.TreeViewAdvCancelableNodeEventArgs e)
        {
            Point p = this.treeViewAdv1.PointToClient(Control.MousePosition);
            TreeNodeAdv node = this.treeViewAdv1.GetNodeAtPoint(p, true);
            if (node != null)
            {
                if (node.TextBounds.Contains(p))
                {
                    e.Cancel = true;
                }
            }
        }

        void treeViewAdv1_BeforeCollapse(object sender, Syncfusion.Windows.Forms.Tools.TreeViewAdvCancelableNodeEventArgs e)
        {
            Point p = this.treeViewAdv1.PointToClient(Control.MousePosition);
            TreeNodeAdv node = this.treeViewAdv1.GetNodeAtPoint(p, true);
            if (node != null)
            {
                if (node.TextBounds.Contains(p))
                {
                    e.Cancel = true;
                }
            }
        }

[Sample]
http://www.syncfusion.com/uploads/redirect.aspx?file=TreeViewExpandCollapse_f61f7657.zip&team=support

Please try this and let me know if this helps.

Regards,
Nanda

[Administrator]

Thanks for the info, can you add this as a future enhancement please.

[Nandakumar R]

Hi,

Thanks for the update.

This has already been added as a KB and users can use this option to work with this behaviour. We do not have any feature implementation for this in future as the existing behaviour is considered to be the standard behaviour for Syncfusion TreeViewAdv.

Regards,
Nanda

[Administrator]

It may be the standard implementation that many users require, but surely adding this as a feature will give your users more options.

Furthermore, your code sample doesn't actually work if you double-click the icon, just the text, but this is not a problem for me.

[Githanjali S]

Hi James,

The below code will ensure that the node will expand only when clicked on the Node's Expandable button ( that is, the "+" box on the left of the node) and not when clicked either on the image or text associated with the node:

TreeNodeAdv node = this.treeViewAdv1.SelectedNode;
//Get the mouse positions.
Point p = this.treeViewAdv1.PointToClient(Control.MousePosition);

//Make the Left Image as the clickable object using the Rectangle
Point imgpt = new Point(node.TextAndImageBounds.X, node.TextAndImageBounds.Y);
Size imgSize = new Size(this.imageList1.ImageSize.Width, this.imageList1.ImageSize.Height);
Rectangle imgrec = new Rectangle(imgpt, imgSize);

    if (node != null)
       {
         if (imgrec.Contains(p)||node.TextBounds.Contains(p))
          {
             e.Cancel = true;
          }
         else
          {
             e.Cancel = false;
          }
       }
             

Regards,
Githanjali