Finding which customtextbox sends the focus message to customdatagridview

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I have a customtextbox and a customdatagridview . the customtextbox on its OnKeyDown event behaving as tab and on its back key behaving as reverse tab respectively . Now on my customdatagridview's OnEnter, I want to analyze which customtextbox is sending the focus to customdatagridview so that I change my current cell accordingly , but I am confused as how to get it .

What I have tried:

C#

public partial class betterdatagridview : DataGridView
        {
        protected override void OnEnter(EventArgs e)
        {
            // datagridview has data 
            if (this.RowCount > 0)
            {

                if () // what to place here to check which customtextbox send me here 
                {
                    this.CurrentCell = this.Rows[0].Cells[0]; // select the first cell in the first row
                }
                else if()
                {
                    this.CurrentCell = this.Rows[RowCount - 1].Cells[0];//[0, this.RowCount - 1]; // select the last row's first cell
                }
             
                this.BeginEdit(true); // it must stay here 
                TextBox textBox = (TextBox)this.EditingControl; // Cast the EditingControl to TextBox
                textBox.SelectionStart = textBox.Text.Length; // select the textbox from last 
                
            }

and below is the customtextbox

C#

protected override void OnKeyDown(KeyEventArgs e)
        {
            if (!DisableFeatures)
            {
                if ((e.KeyCode == Keys.Enter || e.KeyCode == Keys.Down)&& this.Text !="")
                {
                    e.Handled = true;
                    e.SuppressKeyPress = true;
                    TriggerEvent?.Invoke(Last, Name);
                    if (!Last)
                    {
                        SendKeys.Send("{TAB}");
                    }
                   
                    return;
                }
                if ((e.KeyCode == Keys.Back || e.KeyCode == Keys.Up) && this.Text.Length == 0)
                {
                    SendKeys.Send("+{TAB}");
                }
            }
            base.OnKeyDown(e);          
        }

Posted 19-Jul-23 23:29pm

Ankit Goel

Updated 19-Jul-23 23:54pm

Andre Oosthuizen

v2

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Graeme_Grant · Accepted Answer · 2023-07-19T23:39:00

Hook up the LostFocus event to each TextBox, all pointing to the same event handler. Then a Form level field to track a TextBox. Something like:

C#

public Form1()
{
    InitializeComponent();

    textBox1.LostFocus += OnTextBox_LostFocus;
    textBox2.LostFocus += OnTextBox_LostFocus;
    textBox3.LostFocus += OnTextBox_LostFocus;
}

private TextBox LastAccessed = null;

private void OnTextBox_LostFocus(object sender, EventArgs e)
{
    LastAccessed = sender as TextBox;
}

Now you know who, you can do what you want.