Limiting node zone selection

[Nathalie]

Hi,


Is there a way to restrict a RadTreeNode selection zone? In other words, I want to select/highlight a node only when the mouse is over the tree node name, and then not being able to select/highlight a node when the mouse is located in a blank space.


Regards.

[Anton]

Hi Nathalie,

Thank you for writing.

You will achieve this behavior if you set FullRowSelect property to "false". For example:

this.radTreeView1.FullRowSelect = false;

I hope this information helps. If you have further questions, feel free to write back

All the best,
Anton
the Telerik team

[Nathalie]

Thanks for your answer.

My problem is I do not have the root node showing up in the tree view and I would like to get a general contextual menu while right-clicking in a blank space (and then no node is selected in the tree view).

When I right-click on a node name, I want its own contextual menu showing up (and not the general contextual menu).

Nathalie.

[Anton]

Hello Nathalie,

Thank you for writing back.

Here is how you can achieve the desired behavior:

1.Create your custom TreeViewControl that inherits RadTreeView.

public class MyCustomTreeViewControl : RadTreeView
{
    public MyCustomTreeViewControl()
    {
        this.ThemeClassName = typeof(RadTreeView).FullName;
    }
    protected override RadTreeViewElement CreateTreeViewElement()
    {
        return new MyCustomTreeViewElement();
    }
}

2.Create a TreeViewElement that inherits RadTreeViewElement and override the ProcessContextMenu method with your custom logic. For example:

public class MyCustomTreeViewElement : RadTreeViewElement
{
    protected override bool ProcessContextMenu(Point location)
    {
        RadContextMenu defaultMenu = new RadContextMenu();
        defaultMenu.Items.Add(new RadMenuItem("Item1"));
        defaultMenu.Items.Add(new RadMenuItem("Item2"));

        RadTreeNode node = this.GetNodeAt(location);
        TreeNodeElement element = this.GetNodeElementAt(location.X, location.Y);

        if (node == null)
        {
            defaultMenu.Show(this.ElementTree.Control, location);
        }
        else
        {
            if (element.ContentElement.ControlBoundingRectangle.Contains(location))
            {
                node.ContextMenu.Show(this.ElementTree.Control, location);
            }
            else
            {
                defaultMenu.Show(this.ElementTree.Control, location);
            }
        }

        return true;
    }

    protected override Type ThemeEffectiveType
    {
        get
        {
            return typeof(RadTreeViewElement);
        }
    }
}

3. Use the MyCustomTreeViewControl to replace RadTreeView:

private void Form1_Load(object sender, EventArgs e)
{
    RadTreeNode Node1 = new RadTreeNode("Node1");
    RadTreeNode Node2 = new RadTreeNode("Node2");
    RadTreeNode Node3 = new RadTreeNode("Node3");
    RadTreeNode Node4 = new RadTreeNode("Node4");

    this.myTreeView.FullRowSelect = false;
    this.myTreeView.Nodes.Add(Node1);
    this.myTreeView.Nodes.Add(Node2);
    Node1.Nodes.Add(Node3);
    Node2.Nodes.Add(Node4);

    RadContextMenu nodeMenu = new RadContextMenu();
    nodeMenu.Items.Add(new RadMenuItem("NodeMenuItem1"));
    nodeMenu.Items.Add(new RadMenuItem("NodeMenuItem2"));

    Node1.ContextMenu = nodeMenu;
    Node2.ContextMenu = nodeMenu;
}

Attached is a sample project that comprises the code above. I hope this helps.

Let me know if this solution is not suitable for you.

Should you have any other questions, I will be glad to assist you.

All the best,
Anton
the Telerik team

[Nathalie]

Thank you very much. It works well!

Regards,
Nathalie.