Knowing the point location of the caret in a Winforms TextBox?

Question

I need to know the exact point location in my window where the caret currently resides so that I can pop up a small window under the text (similar to intellisense or a spell

Answer 1

Try this.

Under `Control.KeyPress` event,

I use Control.GetPositionFromCharIndex(Control.SelectionStart) to get the caret position which relate to the control. Then translate this position relate to the screen for the form's new location.

private void aTextBox_KeyPress(object sender, KeyPressEventArgs e)
{
    SuperComboForm supcomboF = new SuperComboForm();
    supcomboF.StartPosition = FormStartPosition.Manual;
    var caret_pos = aTextBox.GetPositionFromCharIndex(aTextBox.SelectionStart);
    supcomboF.Location = PointToScreen(new Point(caret_pos.X, caret_pos.Y));
    supcomboF.ShowDialog();
}