Click on Label triggers BindEvent method of a CheckBox

[Rajesh Karunakaran]

Hi Friends,

In a form, I have created a few checkbox controls at runtime. I used BINDEVENT to map the checkbox's Click event to a method in the form itself. Below is the code generating the checkboxes (just a sample of what I am doing)

FOR c = 1 TO 6
	loName = 'chk_' + ALLTRIM(STR(c))
	thisform.AddObject(loName, 'CheckBox')
	lo = EVALUATE('thisform.' + loName)
	WITH lo
		.left        = 5
		.top         = c*15
		.BackStyle = 0
		.Caption   = ''
		.Visible   = .T.
		.Value     = .F.
	ENDWITH 
	=BINDEVENT(lo, 'Click', thisform, 'object_event_handler', 1) 
ENDFOR

Along with these, I have some labels in the form created at design time.

Now, when I click on the label, it appears that the event of the checkBox is fired and the 'object_event_handler' method is being called.

Any clue?

Rajesh

 

[Mike Lewis]

Rajesh,

I can't reproduce this. I have created a form with your code in the Init and with a label added at design time. But it all runs as expected. I also tried moving the code to the Click of a button.

Can you post some code to recreate the entire form?

Mike

__________________________________
Mike Lewis (Edinburgh, Scotland)

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[Rajesh Karunakaran]

Mike,

Let me try to create a form itself with the same codes that I am using in my original. If I get problem in the sample, I will post it here soon. Otherwise, obviously, my original form has something wrong that I didn't see yet. I will have to check it then.

Thanks
Rajesh

 

[Rajesh Karunakaran]

Mike,

I think I got the problem. It's very interesting!

In your form, place the labels very near to the right of the dynamically created checkboxes, say, about half a centimeter distance. Then, please check if you see this behavior. Or, even clicking very near to the check box also must give you that behavior. The reason is cool! However, just for a fun, can you check this please... ?

If your controls' defaults are different than mine, you may not see this. But, I want to know what you see.

Rajesh

 

[Mike Lewis]

Rajesh,

Yes, I can see it now. I placed the label just to the right of one of the checkboxes, and I saw the behaviour you described.

The reason is obvious. The clickable area of the checkbox is not just the checkbox itself; it is also the area occupied by the checkbox's caption. That's true, even if the caption is blank. So when you think you are clicking on the label, you might in fact be clicking on the checkbox's caption, and that would cause the event to fire.

In fact, you will see this behaviour even without the label. Run any form containing a checkbox, where the checkbox has no caption. Click about half a centimetre to the right of the checkbox. You will see the checkbox being toggled.

In your case, an easy solution would be set the checkbox's Width property to a fairly low value, perhaps 10 or 20: wide enough to make the checkbox itself visible but narrow enough to remove the caption. Experiment to get the best value.

Mike

__________________________________
Mike Lewis (Edinburgh, Scotland)

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[Rajesh Karunakaran]

Mike,

Yeah! Yeah! That was it. I had seen what it was and already solved.


So, in the code, just before making the .Caption = '', I added .AutoSize = .T. and now the problem seems to be solved.

Rajesh