Focus issue on textbox

Question

Focus issue on textbox

rahul kumar 605

Hi , I want to disable or modify the event for the all the seven textboxes in my form , in which when the cursor is already on any textbox ( there are seven textboxes on a form ) and in between if the user by using mouse ( only mouse ) tries to get into another textbox , he should be unable to do so . Is there a event which can cancel this .

3 answers

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Answer 1

David Lowndes 2,640 MVP

See if this gives you some ideas.

I'd caution you against doing it though - it'll probably annoy your application's users at some point!

rahul kumar 605 Reputation points

2023-06-24T13:08:14.0433333+00:00

sorry @David Lowndes , I didn't find any useful event for my purpose .

Answer 2

Karen Payne MVP 35,586 Volunteer Moderator

After thinking about this my opinion is to not go in this direction as it can make the user frustrated along with a non-standard path to do data entry. A more conventional approach is to allow the user to enter data in any order they choice then validate which is how web applications do. If open to this I have an article with source code to show how to do this for Windows Forms projects.

Yes this goes against what you are after but it's the better method.

Window forms data annotation. Sample screenshot from article.

ValidateForm

rahul kumar 605 Reputation points

2023-06-25T09:45:52.6533333+00:00

@Karen Payne MVP , How would the same exact code will solve the focus issue ?? Sorry if i miss something But i didn't find anything about focus in this answer
rahul kumar 605 Reputation points

2023-06-26T15:55:38.63+00:00

@Karen Payne MVP , Hi would you please resolve my issue . I could not find anything about focus here in your particular suggestion
Karen Payne MVP 35,586 Reputation points Volunteer Moderator

2023-06-27T00:47:50.36+00:00

I will have to think about this. And also, what are the rules behind not allowing a user to exist the current TextBox and what allows leaving?
rahul kumar 605 Reputation points

2023-06-27T07:49:56.3966667+00:00
@Karen Payne MVP , The seven textboxes are in order (like name , gender, age , address etc) .
what allows leaving?
Only when he fills something in anyone of the textbox and presses enter he is allowed to leave .
not allowing a user to exist the current TextBox?
if the textbox is empty (so even if he presses enter , he is stuck ) . but this part i have done . thanks to your help

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); }

The problem is not about not allowing a user to exist the current TextBox and what allows leaving . I want to make sure that if the cursor is inside the textbox and he by using mouse tries to enter any other textbox , he should not be allowed to enter . In other words , only when he enter somethin and presses enter , he is allowed to leave the textbox
Karen Payne MVP 35,586 Reputation points Volunteer Moderator

2023-06-27T09:54:27.0366667+00:00

I updated my answer, after thinking about this I can't provide code as it goes against convention wisdom and how users expect things to work, sorry.

rahul kumar 605

@Karen Payne MVP , Hi i have managed to somehow partially achieved by using the code below

 public partial class customtextbox : TextBox  
   { 
 protected override void WndProc(ref Message m)
        {           
                switch (m.Msg)
                {
                    case 0x0201://WM_LBUTTONDOWN
                        {
                            return;
                        }

                    case 0x0202://WM_LBUTTONUP
                        {
                          return;
                        }
                    case 0x0203://WM_LBUTTONDBLCLK
                        {
                            return;
                        }
                    case 0x0204://WM_RBUTTONDOWN
                        {
                            return;
                        }
                    case 0x0205://WM_RBUTTONUP
                        {
                            return;
                        }
                    case 0x0206://WM_RBUTTONDBLCLK
                        {
                         return;
                        }
                }
                base.WndProc(ref m);
            }

just one last query , how to stop the cursor being showing inside the textbox

Answer 3

Anonymous

Hi @rahul kumar ，Welcome to Microsoft Q&A.

If you want to hide cursor in custom textbox.

You can do this.

[DllImport("user32.dll")]
    private static extern bool HideCaret(IntPtr hWnd);

    protected override void OnGotFocus(EventArgs e)
    {
        base.OnGotFocus(e);
        HideCaret(Handle);
    }

User's image

Best Regards,

Jiale

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rahul kumar 605 Reputation points

2023-07-06T07:50:09.8+00:00

@Anonymous , any update on this problem

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Focus issue on textbox

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