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user control refresh issue

Posted on 2011-03-14
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Last Modified: 2012-08-13
Hi Experts,
I have a problem related to the refresh method of a usercontrol:
I've implemented a usercontrol containing a label and button. I've implementet a method which
change the label color when the button is pressed and it works.
The usercontrol is iserted inside a tabcontrol. When I try to recall the same refresh logic of the button inside
the on_tabindexchanged method of the tabcontrol, I can see by debugg that the code is executed
and the color attribute of the label is correct, but it is not displayed. I've also tried to call the invalidate,
refresh, application.doevents methods but nothing happens (the label remains in the original color)
Thanks for help.
0
Comment
Question by:dionisio_79
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12 Comments
 
LVL 85

Expert Comment

by:Mike Tomlinson
Comment Utility
Can we see your code in the tabindexchanged() event?
0
 

Author Comment

by:dionisio_79
Comment Utility
I don't have the original source code here (tomorrow morning I will)   but it is something like:

 tabindexchanged(..)
{
a.methodxx()
}

where a is the usercontrol object which has been added in the tabcontrol constructor.

the methodxx  is the same method used inside the a.button1_click method
it changse the color of the label: label1.forecolor=color.yellow
0
 
LVL 85

Expert Comment

by:Mike Tomlinson
Comment Utility
"which has been added in the tabcontrol constructor"

So you are using a custom TabControl?  What kind of modifications have you made?

Give us the "big picture" please.
0
 

Author Comment

by:dionisio_79
Comment Utility
Sorry,
 you're right.

The usercontrol has been added to one tab of the tabcontrol, which is owned by the main class (extends form).
Anyway, I will send you a complete code sample tomorrow.

Thank you.




0
 

Author Comment

by:dionisio_79
Comment Utility
Hi All,

here's the code sample:


gpcl : UserControl
{

....
private void button1_Click(object sender, EventArgs e)
{
            methodxx();
}

....
public void methodxx(){label1.color=color.yellow}
this.Invalidate();
this.Refresh();
Application.DoEvents();
....

}


-----------------------------------------------------------------

mainclass: form

 private TabPage tabXX;
 private gpcl GP;

 public mainclass()
{
         
           InitializeComponent();
            this.Load += new EventHandler(mainclass_Load);
            LoadControl();

}

InitializeComponent()
{
...
tabXX= new System.Windows.Forms.TabPage();
}

void mainclass_Load(object sender, EventArgs e)
{
         GP = new gpcl();
          GP.Location = new System.Drawing.Point(0, 3);
         GP.Size = new System.Drawing.Size(794, 361);
                        tabXX.Controls.Add(GP);

}

 private void tabControl_SelectedIndexChanged(object sender, EventArgs e)
        {
         if (...tab index is th one interested..)  
                   GP.methodxx();
           
        }

}
0
 
LVL 85

Expert Comment

by:Mike Tomlinson
Comment Utility
I'm not seeing the issue in your sample code.

What is LoadControl() doing though?
0
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Author Comment

by:dionisio_79
Comment Utility
The LoadControl method only assigns a text to the text property of the label:

lebel1.text="..sometext..";
0
 
LVL 85

Expert Comment

by:Mike Tomlinson
Comment Utility
You probably just didn't post it...but I don't see where you're adding "tabXX" (your tabpage) to the TabControl.
0
 

Author Comment

by:dionisio_79
Comment Utility
In the designer (InitializeComponent method):

this.tabControl.Controls.Add(this.tabXXi);
0
 
LVL 85

Expert Comment

by:Mike Tomlinson
Comment Utility
Anyway you can upload a bare minimum project that has this issue?
0
 

Accepted Solution

by:
dionisio_79 earned 0 total points
Comment Utility
Sorry, I don't have permission for this (it is not my own code).
Possibly, when I have time, I will create my own project just to work it out.
Thank you anyway.
0
 

Author Closing Comment

by:dionisio_79
Comment Utility
I had not a complete sample so Experts were'nt able to halp me
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