Problem control in tabcontrol

Question

I have created usercontrol.It contains RichTextBox and listbox.After the user presses the new button, SaveFileDialog will ask where to save the file.The UserControl is added to tabpage.Listbox appears when I enter dot in RTB.It works.I add tabpage (new button again).I get a problem when entering text.Listbox does not appear in the selected RichTextBox.Listbox always appears in the latest tabpage.
for example:
New button-> add tabpage
I enter text in tabpage 1
Listbox appears in tabpage2
I need it to appear in tabapge1

New button:

            SaveFileDialog savedlg = new SaveFileDialog();
            string filename = "";
            InitSaveDlg(savedlg);
            if (savedlg.ShowDialog() == DialogResult.OK && savedlg.FileName.Length > 0)
            {
                filename = savedlg.FileName;
                using (StreamWriter writer = new StreamWriter(savedlg.FileName))
                {
                }
                filename = getFileName(filename);
            }
            if (filename.Length > 0)
            {
                TabPage newTab = new TabPage(filename);
                UserControl1 uc = new UserControl1();
                uc.Name = "uc";
                uc.Dock = DockStyle.Fill;
                uc.BorderStyle = BorderStyle.None;
                uc.rtb.LoadFile(filename, RichTextBoxStreamType.PlainText);
                newTab.Controls.Add(uc);
                tabControl1.TabPages.Add(newTab);
                tabControl1.SelectedTab = newTab;
            }

Answer 1

Probably the problem is in the fragment that deals with keyboard events and displays the listbox. Show some details.

Answer 2

                //RTB_KeyDown
                if (e.KeyData == Keys.OemPeriod &&  dotcounter==0)
                {
                    lblTooltip.Hide();
                    SetLstLocation();
                    listBox1.Items.Clear();
                    //add Item
                    loadXML(listBox1, "do1");
                    listBox1.Focus();
                    //List.List.AutoSelect(textBox1.Text.Trim());
                    Key="do1";
                }
                if (e.KeyData == Keys.OemPeriod && dotcounter == 1)
                {
                    lblTooltip.Hide();
                    List.List.SetLstLocation();
                    listBox1.Items.Clear();
                    loadXML(listBox1, "do2");
                    listBox1.Focus();
                    //List.List.AutoSelect(textBox1.Text.Trim());
                    Key="do2";
                }

SetLstLocation:

        public static void SetLstLocation()
        {
            Point point = richTextBox1.GetPositionFromCharIndex(richTextBox1.SelectionStart);
            point.Y += (int)Math.Ceiling(richTextBox1.Font.GetHeight()) + richTextBox1.Location.Y; 
            point.X += richTextBox1.Location.X; 
            lst.Location = point;
            lst.Show();
        }

Answer 3

Use the Debugger and check if the code that fills and shows the list box is executed when you press keys. Then make sure the list box is visible and is not covered by other controls. Sometimes listBox1.BringToFront() helps. Also check if SetLstLocation and List.List.SetLstLocation correctly set the position of list box based on right Rich text box.

Answer 4

Hi tuanhp_1605,

In the button click event handler, the code will set the new created tabpage as select tab. Are you sure that you enter the RichTextBox in the tabpage1.

Base on my understanding, since both the RichTextBox and ListBox is a member of usercontrol, I think your current code will not display the ListBox in another control, could you please share a demo through SkyDrive?

By the way, what is "lst" in the SetLstLocation method?

Best Regards,

---

Bob Wu [MSFT]
MSDN Community Support | Feedback to us

Answer 5

 I added BringToFront.But not improve results.Listbox appears correctly in latest tabpage.If I enter text in the newest tabpage,everything is good.I open the tabpage1.Next,Enter text.I am just found listbox after re-open the latest tabpage.Listbox cannot be displayed in currently tabpage.

Answer 6

lst is public Listbox lst in My class.I get good results when only one tabpage.

Answer 7

Hi tuanhp_1605,

If lst is public ListBox, so what's ListBox1?

Would you mind share a demo through SkyDrive? It would be help us to understand your issue clearly.

Thanks.

Best Regards,

---

Bob Wu [MSFT]
MSDN Community Support | Feedback to us