Tri-State Checkboxes in WinForms TreeView

Question

I have a TreeView that allows users to select certain elements of hierarchical data by checking or un-checking each item\'s checkbox. Currently I disable the box on nodes th

Answer 1

This code might help you if you are thinking of drawing the mixed checkbox

class MixedCheckBox:Control
{
    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);
        CheckBoxRenderer.DrawCheckBox(e.Graphics, new Point(0, 0), Bounds, 
            Text, Font, false, 
            System.Windows.Forms.VisualStyles.CheckBoxState.MixedNormal);
    }
}

This will render:

Good luck!

Answer 2

There is now a neat looking solution at Code Project, Tri-State Tree View

I'm just researching at the moment, so haven't yet used it.

Answer 3

Have you taken a look at this? It seems to do the job. It might be a bit dated, (looks like the article is from 2004), but I'm sure the same principles can be extended to whatever you need to do.