How to destroy events

[jamsek19]

Hello.
I have a problem regarding events:
When I want to leave (for example) textbox I catching Leave event of that control and do a check if I can leave this control. In a case that control must not be leaved I fire event to set focus to this control again. The problem here is that the next control in a tabindex row got focus and then Leave event is fired again but this time from next control in a tabindex row caused by Enter method from first control.

Is it possible to somehow destroy other events in the case when I don't want to leave the text box.
Validate event is not an option!

Thanks in advance
Andreo

 

[JurkMonkey]

Make it a generic event handler and set it to the next textbox if the tab key is pressed.

private EventHandler resetfocusevent = new EventHandler(resetfocus);

private void resetfocus(object sender, EventArgs e)
{
((Control)sender).SetFocus();
}


then you can attach it to the textboxes individually:

private void MoveNext()
{
textbox1.LostFocus -= resetfocusevent; //remove from the previous
textbox2.LostFocus += resetfocusevent; //add to the next
}


That's a very rough idea...

 

[jamsek19]

Thanks JurkMonkey for replay.

This is very rough idea and I think is not so good.
I'm searching for something that can destroy events before got focus in next control in a row.
Well, at the moment I have implemented this by one global variable which on error in GotFocus method return focus back. Problem here is that I got many events and therefore slowing down application.

Best regards
Andreo

 

[phinoppix]

Hi Andreo,

Maybe you can check on <control>.Validating event. After the Leave event is fired, the Validating event follows if the <control>.CausesValidation property is true. From here, you will have access to the CancelEventArgs with a Cancel member, setting it to true will prevent the caret/focus from leaving the control.

void yourcontrol_Validating(object sender, CancelEventArgs e)
{
    if ( [COLOR=green]your_condition[/color] )  
    {
        [COLOR=green]// Cancel leaving, provided the CausesValidation property
        // is set to "true"[/color]
        e.Cancel = true;
    }
}

hope this helps