KPFloatingPanel.MainForm.toolStripTextSearch_KeyDown C# (CSharp) Method

        private void toolStripTextSearch_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode != Keys.Down && e.KeyCode != Keys.Up && e.KeyCode != Keys.Enter)
                return;
            ToolStrip parent = toolStripTextSearch.GetCurrentParent();
            ToolStripItem prev_item = null;
            ToolStripItem next_item = null;
            bool at_item = false;
            foreach (ToolStripItem itm in parent.Items) {
                if (itm == toolStripTextSearch)
                    at_item = true;

                if (itm as ToolStripMenuItem == null)
                    continue;

                if (!itm.Visible)
                    continue;

                if (!at_item && itm != toolStripTextSearch)
                    prev_item = itm;

                if (at_item) {
                    next_item = itm;
                    break;
                }
            }
            if (e.KeyCode == Keys.Enter && next_item != null) {
                miItem_OpenURL(next_item, null);
            }

            if (e.KeyCode == Keys.Down && next_item != null) {
                e.SuppressKeyPress = true;
                e.Handled = true;
                parent.Focus();
                next_item.Select();
            }
            if (e.KeyCode == Keys.Up && prev_item != null) {
                e.SuppressKeyPress = true;
                e.Handled = true;
                parent.Focus();
                prev_item.Select();
            }
        }