Selected Event

[Frédéric]

Hi,

Sorry to ask you so much question but I still have a little problem.

I'm using the Selected event and I have a problem.

I'm using multi selection.

>I select 1 node with the
>Then, I click into another non selected node.

I have the feeling that the Selected event is fired before the first node is unselected because when I go to Nodes.selected.count I have 2 node and I should have just one!

Is it normal?

I check the documentation and they say I should use OnSelectionChange but I'm not able to use it. (I'm not an experienced programmer... :-( )

Can you please give me a sample code ?

Thanks in advance for your help.

[Jordan]

Hello Frédéric,

The current implementation of the selection functionality clears the old selection on mouse up when multi-select is on. That is due to the specifics of drag-and-drop and it is by design.

You could try examining the selected nodes in the mouse up handler like in the code below:
 

public Form1()
        {
            InitializeComponent();
            this.radTreeView1.AllowMultiselect = true;

            this.radTreeView1.Selected += new EventHandler(radTreeView1_Selected);
            this.radTreeView1.MouseUp += new MouseEventHandler(radTreeView1_MouseUp);
        }

        private bool selectionChanged = false;
        void radTreeView1_MouseUp(object sender, MouseEventArgs e)
        {
            if (this.selectionChanged)
            {
                this.selectionChanged = false;
                Console.WriteLine("radTreeView1_Selected");
                for (int i = 0; i < this.radTreeView1.SelectedNodes.Count; i++)
                {
                    Console.WriteLine(this.radTreeView1.SelectedNodes[i].ToString());
                }
                Console.WriteLine();
            }
        }

        void radTreeView1_Selected(object sender, EventArgs e)
        {
            this.selectionChanged = true;
        }

For a future release we will try to find a way to correct this behavior without breaking the drag and drop functionality. Unfortunately, I cannot give you a specific time frame for that at the moment.


Kind regards,
Jordan
the Telerik team

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