QWidget control

[dan1973]

i need to resize my QPushButton to same as my parent QWidget window?

Any idea?

I had been using this code below:

b1 = new QPushButton("Hello", this);
    b1->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    b1->resize(this->size());
    b1->show();

[dan1973]

@dan1973

My new updated code:

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    b1 = new QPushButton("Hello", this);
    b1->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    b1->resize(this->size());
    b1->show();
}

Widget::~Widget()
{
    delete ui;
}

void Widget::resizeEvent(QResizeEvent *event)
{
//    qDebug() << event->oldSize();
    b1->resize(event->size());
    QWidget::resizeEvent(event);
}

[JonB]

@dan1973
When are you calling this code? Has this been fully shown by the time the code is called? Check what this->size() is returning when this code is executed: it will not be correct if you do this e.g. in the constructor.

[dan1973]

@dan1973

[dan1973]

@JonB
hi,

i had used this code in QWidget Constructor as given below:

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    b1 = new QPushButton("Hello", this);
    b1->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    b1->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
    b1->resize(this->size());
    b1->show();
}

I now found a solution for my requirement:
i had used override function of resizeEvent of QWidget and it worked:

void Widget::resizeEvent(QResizeEvent *event)
{
// qDebug() << event->oldSize();
b1->resize(event->size());
QWidget::resizeEvent(event);
}

Thank you for being with me.:)

[dan1973]

@dan1973

My new updated code:

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    b1 = new QPushButton("Hello", this);
    b1->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    b1->resize(this->size());
    b1->show();
}

Widget::~Widget()
{
    delete ui;
}

void Widget::resizeEvent(QResizeEvent *event)
{
//    qDebug() << event->oldSize();
    b1->resize(event->size());
    QWidget::resizeEvent(event);
}

[JonB]

@dan1973 said in QWidget control:

b1->resize(this->size());

I wouldn't even bother doing this in the constructor --- did you qDebug() << this->size() there like I suggested? But up to you, I guess it does no harm, it will get overwritten by call to Widget::resizeEvent() as soon as shown, I think.