Visual Basic

22-Jun-12 13:16

I made a control which has a button on it.
But I need to change the text of it when it is clicked.

this is what I have tried but it didn't work:

If Button1.Text = "1" then
 Button1.Text = "0"
Elseif Button1.Text = "0" then
 Button1.Text = "1"
End if

Dave Kreskowiak22-Jun-12 14:38

22-Jun-12 14:38

Where did you put this code?? What EXACTLY do you want this to happen??

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Ammar_Ahmad22-Jun-12 14:58

22-Jun-12 14:58

I put that code on a button_click event in a UserControl that I made.
It is supposed to work as a boolean. eg if the value is 1 then it should change it to 0
else if the value is 0 it should change it to 1.

Dave Kreskowiak22-Jun-12 16:09

22-Jun-12 16:09

The click event is not going to work for this. Click is fired after the button is pushed AND released.

Similar code has to be called by the MouseDown, MouseUp, KeyDown and KeyUp handlers. The xDown events fire when the button is pushed down and the mouse or key is still being held down. The xUp events fire when the mouse or key is released.

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Dave Kreskowiak

javadadabi23-Jun-12 2:44

javadadabi

23-Jun-12 2:44

Hello
before selecting another event to let your code,
make a breakpoint after bottun_click() line,run your control in dubug mode check if
break point stop your program,therefore event has no problem,then check your condition state.

Dave Kreskowiak23-Jun-12 3:40

23-Jun-12 3:40

I think you meant to reply to the OP.

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Dave Kreskowiak

Ammar_Ahmad23-Jun-12 4:09

23-Jun-12 4:09

I added breakpoint on button1_click
That event does get fired! And the other code that is in that event gets fired up correctly.
The problem it that, that it doesn't change the text of button1.

Here I have attached the source code as well:
http://www.mediafire.com/?onhramkfh4zy6zx[^]

Ammar_Ahmad23-Jun-12 4:10

23-Jun-12 4:10

Button1_click gets fired. But the text of button1 isn't changing...
Here I have added the source code:
http://www.mediafire.com/?onhramkfh4zy6zx[^]

Can you please look into it?

Luc Pattyn23-Jun-12 4:18

Luc Pattyn

23-Jun-12 4:18

If you mean the Button1 handler should modify the Button1 text, then I see no problem, that works just fine. Mind you, you will see the results only after the Click handler has finished (unless you add a call to Refresh). So changing the text initially, performing a long operation, then changing the text back to its original, all in the one Click handler, will not show any change at all. But then, you shouldn't be doing long operations inside a handler on the GUI thread to begin with... Threads (and BackgroundWorkers) were invented to decouple long operations from the GUI thread.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Ammar_Ahmad23-Jun-12 4:21

23-Jun-12 4:21

I did add refresh() at the end... but that didn't work Frown | :(

Luc Pattyn23-Jun-12 4:35

Luc Pattyn

23-Jun-12 4:35

Then you are doing something wrong. Maybe you have more than one Button1 in your project, and you're talking to the wrong one (it helps to use meaningful names). Maybe its initial text isn't neither "0" nor "1". Maybe ...

You will need to provide a more comprehensive description of what you have if you want to get more effective help around here.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Ammar_Ahmad23-Jun-12 4:41

23-Jun-12 4:41

I actually uploaded the entire source code of the application over here:
http://www.mediafire.com/?onhramkfh4zy6zx[^]

I think I am doing everything right... can you please check what I am doing wrong?

Luc Pattyn23-Jun-12 4:57

Luc Pattyn

23-Jun-12 4:57

Sorry, I am not going to download, unpack, and investigate a bunch of code, and neither would anyone else around here. If you want effective help, put some effort in describing the problem properly and provide the relevant pieces of code (inside your message, and using PRE tags), not just all of it.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Ammar_Ahmad23-Jun-12 5:28

23-Jun-12 5:28

Alright. So here is the exact issue with all the pictures and everything.
I have a Form which has a FlowLayoutPanel, which has a UserControl on it. That Usercontrol has a Button on it.

The initial text of that Button is "0"
But I want to change that to "1" if it is a "0" and change it back to "0" if it is a "1"

So this is the code I used on the UserControl which has the Button on it:

Public Class UserControl1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If Button1.Text = "0" Then
            Button1.Text = "1"
        ElseIf Button1.Text = "1" Then
            Button1.Text = "0"
        End If
    End Sub
End Class

But when I click on Button1, the event does get fired but the text of the Button1, that is on the UserControl which is drawn on FlowLayoutPanel doesn't get changed.

Dave Kreskowiak23-Jun-12 5:42

23-Jun-12 5:42

First, you don't need ElseIf in this case. It should just be:

If Button1.Text = "0" Then
    Button1.Text = "1"
Else
    Button1.Text = "0"
End If

Second, Button1 is a horrible name for a button. Change it to something meaningful, like "OkButton", so you know without thinking which button it's referring to on your form.

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Ammar_Ahmad24-Jun-12 3:59

24-Jun-12 3:59

Still doesn't work.

Dave Kreskowiak24-Jun-12 4:36

24-Jun-12 4:36

I have no idea what you're doing wrong because this works fine. I wiped up this little example in about a minute:

Private Sub TestButton_MouseDown(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles TestButton.MouseDown
    ChangeButtonText(TestButton)
End Sub

Private Sub TestButton_MouseUp(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles TestButton.MouseUp
    ChangeButtonText(TestButton)
End Sub

Private Sub ChangeButtonText(ByRef target As Button)
    If target.Text = "0" Then
        target.Text = "1"
    Else
        target.Text = "0"
    End If
End Sub

If you want the button to change text like a toggle, just remove the MouseUp handler.

Truthfully, I'd be creating my own button control to wrap this functionality and overriding the OnMouseDown and OnMouseUp methods to do this. I wouldn't be doing it using event handlers.

But, since this method is easier to understand, here you go...

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Dave Kreskowiak

Ammar_Ahmad24-Jun-12 4:44

24-Jun-12 4:44

That worked beautifully Big Grin | :-D

BIG THANKS M8!

javadadabi23-Jun-12 7:41

javadadabi

23-Jun-12 7:41

Dear ammar ahmad
there was no user control name usercontrol1 in your solution.
I saw your coding,you are more expert than me.
I didnt run your program at all.
Would you please tell me what this code is for?

Ammar_Ahmad24-Jun-12 4:00

24-Jun-12 4:00

It is there... it should be under Form1.
This is Twitter client that I am working on.

Ally523-Jun-12 16:15

Ally5

23-Jun-12 16:15

Try changing the sub to:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If Button1.Text = "0" Then
            Button1.Text = "1"
        Else
            Button1.Text = "0"
        End If
    End Sub

Ammar_Ahmad24-Jun-12 4:01

24-Jun-12 4:01

nope. not working.

Nick Otten24-Jun-12 23:07

Nick Otten

24-Jun-12 23:07

Oke i know this sounds a bit basic but have you checked for spaces? strings are quite picky with those. "0 " is not the same as "0" for them. tough its likely a human will read over that last space.

you could add a replace to the .text to get rid of this problem.

If Button1.Text.Replace(" ","") = "1" then
 Button1.Text = "0"
Elseif Button1.Text.Replace(" ","") = "0" then
 Button1.Text = "1"
End if

EDIT: oke reading some more and i hear some rumors that your using several threads. if this thing is executed in a thread you might want to enforce the update to your gui.

Private Sub updateUI()
    If Me.InvokeRequired Then
        Me.Invoke(New MethodInvoker(AddressOf updateUI))
    Else
        Me.Update()
    End If
End Sub

if your using that button thing in a sub/background thread then add the above sub and try calling it after the button event is done. be aware that this isn't good code and will enforce a full refresh of your screen, its a nice way to test tough.

Ammar_Ahmad25-Jun-12 1:13