problems with getting height and width of widget

I need to get the height and width for a QFrame inside a tab of a QTabWidget. The QFrame is inside the first tab of the tabwidget and I can only get the right width and height if this is the tab selected when I do showMaximized. From what I understand I can get the width and height if the widget have been shown as this is when it is calculated. So from what I understand the best way to get the size must be when changing between the tabs and the new tab is visible. How can I do that?

Its a little bit hard to explain the problem but the main thing is that I need to get the height and width of a QFrame and as the QFrame is depending of the screen size it changes when it becomes visible. So how can I get the size of the QFrame?

This is the code (If I set tabWidget->setCurrentIndex(0) I get the right size in whatIsTheSize(), as 0 is the tabindex with the QFrame inside.)
main.cpp:

Code:

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TestSize *w = new TestSize();
		w->showMaximized();
		w->whatIsTheSize();

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TestSize.cpp:

Code:

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void TestSize::whatIsTheSize() {
	int WIDGETWIDTH = ui.frame->width();
	int WIDGETHEIGHT = ui.frame->height();
}

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ui_testsize.h:

Code:

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void setupUi(QWidget *TestSizeClass)
    {
        if (TestSizeClass->objectName().isEmpty())
            TestSizeClass->setObjectName(QString::fromUtf8("TestSizeClass"));
        TestSizeClass->resize(207, 300);
        verticalLayout = new QVBoxLayout(TestSizeClass);
        verticalLayout->setSpacing(6);
        verticalLayout->setContentsMargins(11, 11, 11, 11);
        verticalLayout->setObjectName(QString::fromUtf8("verticalLayout"));
        tabWidget = new QTabWidget(TestSizeClass);
        tabWidget->setObjectName(QString::fromUtf8("tabWidget"));
        tab_3 = new QWidget();
        tab_3->setObjectName(QString::fromUtf8("tab_3"));
        verticalLayout_2 = new QVBoxLayout(tab_3);
        verticalLayout_2->setSpacing(6);
        verticalLayout_2->setContentsMargins(11, 11, 11, 11);
        verticalLayout_2->setObjectName(QString::fromUtf8("verticalLayout_2"));
        frame = new QFrame(tab_3);
        frame->setObjectName(QString::fromUtf8("frame"));
        QSizePolicy sizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
        sizePolicy.setHorizontalStretch(0);
        sizePolicy.setVerticalStretch(0);
        sizePolicy.setHeightForWidth(frame->sizePolicy().hasHeightForWidth());
        frame->setSizePolicy(sizePolicy);
        frame->setFrameShape(QFrame::StyledPanel);
        frame->setFrameShadow(QFrame::Raised);
 
        verticalLayout_2->addWidget(frame);
 
        tabWidget->addTab(tab_3, QString());
        tab_4 = new QWidget();
        tab_4->setObjectName(QString::fromUtf8("tab_4"));
        verticalLayout_3 = new QVBoxLayout(tab_4);
        verticalLayout_3->setSpacing(6);
        verticalLayout_3->setContentsMargins(11, 11, 11, 11);
        verticalLayout_3->setObjectName(QString::fromUtf8("verticalLayout_3"));
        frame_2 = new QFrame(tab_4);
        frame_2->setObjectName(QString::fromUtf8("frame_2"));
        frame_2->setFrameShape(QFrame::StyledPanel);
        frame_2->setFrameShadow(QFrame::Raised);
 
        verticalLayout_3->addWidget(frame_2);
 
        tabWidget->addTab(tab_4, QString());
 
        verticalLayout->addWidget(tabWidget);
 
        retranslateUi(TestSizeClass);
 
        tabWidget->setCurrentIndex(1);
 
        QMetaObject::connectSlotsByName(TestSizeClass);
    }

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Thanks really much!

Anyone got an idea on this?

Not sure if I understand you, but did you try currentChanged ?

Try to use contentsRect function.