[Qt-interest] radio button selection

[Ramesh]

Hey, Denis..

 

Thank you.

 

Thanks lot for very usefull information. Have a great day J

 

 

From: Denis Akhmetzyanov [mailto:dakhmetzyanov at smartlabs.tv] 
Sent: Friday, April 23, 2010 9:09 PM
To: Ramesh
Cc: Qt-interest at trolltech.com; QtS60-feedback at trolltech.com
Subject: Re: [Qt-interest] radio button selection

 

Hi,

It seems to me that reset of the focus occurs on QWidget::setLayout() call.
In the body of this method you could see the lines (Qt 4.6.2):

 

void QWidget::setLayout(QLayout *l)

{

...

QObject *oldParent = l->parent();

...

 if (oldParent != this) {

        l->setParent(this);

        l->d_func()->reparentChildWidgets(this);

 

reparentChildWidgets() calls to QWidget::setParent() which contains:

 

    if (newParent && isAncestorOf(focusWidget()))

        focusWidget()->clearFocus();

 

Thus focus is clearing on change the parent. The simple example:

 

    QRadioButton *radioBtn1 = new QRadioButton("Radio 1");

    QRadioButton *radioBtn2 = new QRadioButton("Radio 2");

 

    // second radio button has focus now

    radioBtn2->setChecked(true);

    radioBtn2->setFocus();

 

    QVBoxLayout *vLayout = new QVBoxLayout(this);

    vLayout->addWidget(radioBtn1);

    vLayout->addWidget(radioBtn2);

 

    // focus resets to first radio button

    setLayout(vLayout);

 

If you run this example you'd see that the first radio button has focus. It
is because the parent of the radio buttons has been changed. We can fix
that:

 

    // we set the target parent before calling setLayout()

    QRadioButton *radioBtn1 = new QRadioButton("Radio 1", this);

    QRadioButton *radioBtn2 = new QRadioButton("Radio 2", this);

 

    // second radio button has focus now

    radioBtn2->setChecked(true);

    radioBtn2->setFocus();

 

    QVBoxLayout *vLayout = new QVBoxLayout(this);

    vLayout->addWidget(radioBtn1);

    vLayout->addWidget(radioBtn2);

 

    // all right. second radio button has focus

    setLayout(vLayout);

 

So to deal with QStackedWidget we should set the target parents also.
Example:

 

    QStackedWidget *stackedWidget = new QStackedWidget(this);

    QWidget *firstPageWidget = new QWidget(stackedWidget);

    QVBoxLayout *vLayout = new QVBoxLayout(firstPageWidget);

 

    QRadioButton *radioBtn1 = new QRadioButton("Radio 1", firstPageWidget);

    QRadioButton *radioBtn2 = new QRadioButton("Radio 2", firstPageWidget);

 

    // second radio button has focus now

    radioBtn2->setChecked(true);

    radioBtn2->setFocus();

 

    vLayout->addWidget(radioBtn1);

    vLayout->addWidget(radioBtn2);

 

    firstPageWidget->setLayout(vLayout);

    stackedWidget->addWidget(firstPageWidget);

 

Its OK, second radio button has focus as expected. If we change any parent
then focus resets to first radio button.

 

In conclusion, IMHO, call to setFocus() after widgets creation and layout is
much easier :-)

 

 

2010/4/23 Ramesh <ramesh.bs at robosoftin.com>

Ya stackwidget only..

 

I created a stack, then I added widget for it..

 

In widget  constructor while creating the radio button I am giving focus. 

I am putting tat radio button to layout.. adding to stack, giving focus..

 

Its perfectly right? Or wat?.. it should work also right?

 

From: Denis Akhmetzyanov [mailto:dakhmetzyanov at smartlabs.tv] 
Sent: Friday, April 23, 2010 6:16 PM


To: Ramesh
Cc: Qt-interest at trolltech.com; QtS60-feedback at trolltech.com
Subject: Re: [Qt-interest] radio button selection

 

Probably focus transfered to another widget. What's the stack? QStackWidget?

Could you show a piece of code which you are using for radio buttons?

 

2010/4/23 Ramesh <ramesh.bs at robosoftin.com>

Hey, sorry denis..

It worked.. 

 

But one doubt.. I did focus after putting the widget to stack..

I don't know what is the problem L

 

From: Denis Akhmetzyanov [mailto:dakhmetzyanov at smartlabs.tv] 
Sent: Friday, April 23, 2010 5:30 PM
To: Ramesh
Cc: Qt-interest at trolltech.com; QtS60-feedback at trolltech.com
Subject: Re: [Qt-interest] radio button selection

 

Hi,

Try to use mOnbutton->setFocus()

 

2010/4/23 Ramesh <ramesh.bs at robosoftin.com>

Hi,

 

I have a radio button in my application,

If I do "mOnbutton->setChecked(true)" radio button gets checked, but its not
getting selected, I mean selection rect is  not appearing but button is
getting selected..

How can I make button to show the selection rect

 

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-- 
Best regards,
Denis Akhmetzyanov

 

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-- 
Best regards,
Denis Akhmetzyanov

 

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Robosoft Technologies - Come home to Technology

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content or virus.

 




-- 
Best regards,
Denis Akhmetzyanov


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