[Qt-interest] check box problem

[ramesh.bs at robosoftin.com]

Hi Frank and Andre,
Thanks for your answeres..

The behaviour what i expected was, if i click on "radiobutton1",it should
only get ticked and unticked, but in my case if i click on "radiobutton1"
other radio buttons state was getting effected. it because as you said
they are mutually exclusive.. but i found a solution for my problem.

i.e Only I need to set setAutoExclusive  properties false to all the radio
button.
Here is the updated code,.
     radio1->setAutoExclusive(false);


     radio2->setAutoExclusive(false);

radio2->setAutoExclusive(false);



> Hello Ramesh (and Andre) -
>
> On Wed, May 12, 2010 at 7:48 AM, Andre Somers <andre at familiesomers.nl>
> wrote:
>> On 12-5-2010 13:35, Ramesh wrote:
>>
>> Hi, all
>>
>> What is the mistake in this code,
>>
>> Initially, all the check boxes will be selected, later if I click first
>> checkbox, it will get untick, later if I click on the first box again,
>> it
>> will get selected but the second one will be unticked.. similarly if I
>> reaped the process, the third box also get unticked.. my I know where I
>> am
>> wrong

>> ...
>>
>> That is the expected behaviour from radio buttons. You did not specify
>> what
>> kind of behaviour you are looking for, so I have no idea what you want
>> to
>> achieve. Perhaps you should use QCheckBox instead? QRadioButtons are
>> supposed to be mutually exclusive.
>>
>> André
>
> I agree with Andre:  It's not clear what behavior you are expecting, so
> I'm not
> sure what you're asking.
>
> As Andre says, if you don't want your buttons to be mutually exclusive,
> use
> something like QCheckBox.
>
> However, I do see in your sample code a reference to "exclusive"...
>
>> Here is the code L
>> ...
>>
>> RadioButtonwidget::RadioButtonwidget(QWidget *parent)
>>     : QWidget(parent)
>> {
>>
>>          QGroupBox *groupBox = new QGroupBox(tr("Exclusive Radio
>> Buttons"));
>>          QRadioButton *radio1 = new QRadioButton(tr("&Radio button 1"));
>> ...
>
> Because you are labelling your QGroupBox "Exclusive Radio Buttons", I will
> assume that you do want radio buttons with their exclusive behavior.  (I
> don't,
> however, think your QGroupBox actually gets used in your sample code.)
>
>> ...
>>          radio1->setChecked(true);
>>          radio2->setChecked(true);
>>          radio3->setChecked(true);
>
> This, I think, is your problem.
>
> You set all of your radio buttons to their checked state, violating
> the exclusive
> "invariant".  (It's not fully invariant, because it's not fully
> enforced by QRadioButton,
> as your example shows.)
>
> So your RadioButtonwidget displays initially with all of the buttons
> checked, so they
> don't act quite right.
>
> If you want your radio buttons to act normally, you should start out
> with exactly on
> checked, e.g.:
>
>    radio1->setChecked(true);
>    radio2->setChecked(false);
>    radio3->setChecked(false);
>
> Normally you can't uncheck a radio button (that is in a group of more
> than one) by
> clicking on it, but when you start out with more than one checked, you
> can.
> That's the first minor oddity.
>
> Then when re-checking the button you unchecked, rather than clearing all
> of
> the rest of the radio buttons, it appears that Qt (I would guess for the
> sake of
> a minor efficiency gain) unchecks only the the first checked button it
> finds in
> the group of buttons.
>
> So -- as you described -- click the first button twice, and the second
> button
> is unchecked, click the first button twice again, and now the third button
> is
> also unchecked.
>
> Once you get all but one of the radio buttons checked, they should behave
> as expected.
>
> Good luck.
>
> K. Frank
>
>> ...
>
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>
>


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