Question

Using winforms in vs2008. I have a DataGridView and I would like to detect when the vertical scroll bar is visible. What event should I register for?

I am adding the summing the each cell value in the last column of the grid and displaying that value in a textbox at the bottom of the DataGridView.

I would like this textbox to stay lined up with the cell values (I have made them right aligned since it is $$ values) even after the scroll bar is present.

Answer 1

Overriding DGV behavior is usually a huge pain in the neck. Got this going pretty quickly though. Add a new class to your form and paste the code shown below. Compile. Drop the new control from the top of the toolbar onto a form. Implement the ScrollbarVisibleChanged event.

using System;
using System.Windows.Forms;

class MyDgv : DataGridView {
    public event EventHandler ScrollbarVisibleChanged;
    public MyDgv() {
        this.VerticalScrollBar.VisibleChanged += new EventHandler(VerticalScrollBar_VisibleChanged);
    }
    public bool VerticalScrollbarVisible {
        get { return VerticalScrollBar.Visible; }
    }
    private void VerticalScrollBar_VisibleChanged(object sender, EventArgs e) {
        EventHandler handler = ScrollbarVisibleChanged;
        if (handler != null) handler(this, e);
    } 
}