LocationChange Event of Control

Question

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I need to change control(TextBox) location runtime
for that I am using LocationChange event

When I am loading form in FormLoad event I am setting controls Left/Top Property
My code snipt is like

C#

private void Form_Load(object sender, EventArgs e)
{
      this.PayTextBox.Top = this.objChequeTemplate.PayTop;
      this.PayTextBox.Left = this.objChequeTemplate.PayLeft;
}

C#

private void PayTextBox_LocationChanged(object sender, EventArgs e)
{
    objChequeTemplate.PayLeft = ((Control)sender).Left;
    objChequeTemplate.PayTop = ((Control)sender).Top;
}

When loading form it change top location that time event is fire
but when it change left event is not fire

Why It happends?
I think it should fir both time

any suggestion
Thanks

Posted 11-Jun-10 0:35am

Khaniya

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2 solutions

Solution 1

If you read the MS documentation here[^] it clearly states

Occurs when the Location property value has changed.

Changing the Left property doesn't change the Location property.

To get that effect you would have to somehow modify your code to update the Location when left changes e.g. myControl.Location = new Point(newLeftValue, myControl.Location.Y);.

Posted 11-Jun-10 1:36am

Henry Minute

Comments

Khaniya 12-Jun-10 0:32am

Thanks Henry
But I thing It should also fire on changing Top and Left Proeprty also
Any way thanks for you answer

Khaniya 12-Jun-10 0:38am

My question is little bit differ
see my code, I am asking it is firing only once using above code
even I am not changing Location property
why so?

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Henry Minute · Accepted Answer · 2010-06-11T23:23:00

Hi Khaniya,

After getting your comments I have just made a small test project. The results show that my previous answer was incorrect, for which I must apologize. Behind the scenes changing the Top or Left properties does modify the Location property

A Form with just a TextBox. I handled the LocationChanged event for the TextBox to show a MessageBox with a simple message "Location Changed". I then handled the FormLoad event the same as you have except that I set both Top and Left to 10 rather than a variable.

In my test I got "Location Changed" twice, once for Top and once for Left.
The only way that I could get it to only fire once was if I placed the TextBox Left at 10 in the designer, so that when I tried to set it to 10 in FormLoad, it was already there so nothing was changed.

I hope that you will be able to verify this in your project by moving your TextBox wildly out of position in the designer so that you can be sure that both properties get changed on FormLoad

Once again, sorry for giving you bad advice before but I think I am right now, having tested it for myself.

Good luck! :)