CODEWITHSUNDEEP
c#winformstreeview
Crispy
Crispy

Reputation: 15

get treenode under cursor

Basically I have a treeview populated with numerous image files. I am trying to make the NodeMouseHover event bring up a little preview of the image. To do this I need to find out what node the mouse is over, but I cannot get it to work, it is unable to find the tree node at the cursor position.

Here is a simplified version my code

    private void TreeBroswer_NodeMouseHover(object sender, TreeNodeMouseHoverEventArgs e)
    {
        string filePath;
        PictureBox preview;

        TreeNode test = TreeBroswer.GetNodeAt(Cursor.Position.X, Cursor.Position.Y);
        //Also tried MousePosition.X,MousePosition.Y

        if (test == null)
        {
            MessageBox.Show("No tree node");
        }
        else
        {
            filePath = test.FullPath;
            preview = new PictureBox();
            preview.ImageLocation = @filePath;
            // Display preview
        }
    }

It fails to get the tree node no matter where my mouse is. I am not sure if I am getting my mouse position wrong or i'm using GetNodeAt wrong, or both.

Upvotes: 0

Views: 4808

Answers (2)

Grant Winney
Grant Winney

Reputation: 66509

The parameter for that event - TreeNodeMouseHoverEventArgs - already has the information you need.

Just reference e.Node to see which node the mouse is currently hovering over. If you're not hovering over a node, the event won't fire, so no need to check for null.

private void TreeBroswer_NodeMouseHover(object sender, TreeNodeMouseHoverEventArgs e)
{
    var preview = new PictureBox { ImageLocation = e.Node.FullPath };
    // Display preview
}

Upvotes: 4

Turbot
Turbot

Reputation: 5233

The problem is at the arguments you use in the 

TreeBrowser.GetNodeAt(Cursor.Position.X, Cursor.Position.Y)

Try Change to 

treeView1.PointToClient(Cursor.Position)

Or using the arguments of TreeNodeMouseHoverEventArgs 

this.treeView1.GetNodeAt(e.X, e.Y);

Upvotes: 2

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