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:
Qt Code: 
  1. TestSize *w = new TestSize();
  2. 		w->showMaximized();
  3. 		w->whatIsTheSize();
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TestSize.cpp:
Qt Code: 
  1. void TestSize::whatIsTheSize() {
  2. 	int WIDGETWIDTH = ui.frame->width();
  3. 	int WIDGETHEIGHT = ui.frame->height();
  4. }
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ui_testsize.h:
Qt Code: 
  1. void setupUi(QWidget *TestSizeClass)
  2.     {
  3.         if (TestSizeClass->objectName().isEmpty())
  4.             TestSizeClass->setObjectName(QString::fromUtf8("TestSizeClass"));
  5.         TestSizeClass->resize(207, 300);
  6.         verticalLayout = new QVBoxLayout(TestSizeClass);
  7.         verticalLayout->setSpacing(6);
  8.         verticalLayout->setContentsMargins(11, 11, 11, 11);
  9.         verticalLayout->setObjectName(QString::fromUtf8("verticalLayout"));
  10.         tabWidget = new QTabWidget(TestSizeClass);
  11.         tabWidget->setObjectName(QString::fromUtf8("tabWidget"));
  12.         tab_3 = new QWidget();
  13.         tab_3->setObjectName(QString::fromUtf8("tab_3"));
  14.         verticalLayout_2 = new QVBoxLayout(tab_3);
  15.         verticalLayout_2->setSpacing(6);
  16.         verticalLayout_2->setContentsMargins(11, 11, 11, 11);
  17.         verticalLayout_2->setObjectName(QString::fromUtf8("verticalLayout_2"));
  18.         frame = new QFrame(tab_3);
  19.         frame->setObjectName(QString::fromUtf8("frame"));
  20.         QSizePolicy sizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
  21.         sizePolicy.setHorizontalStretch(0);
  22.         sizePolicy.setVerticalStretch(0);
  23.         sizePolicy.setHeightForWidth(frame->sizePolicy().hasHeightForWidth());
  24.         frame->setSizePolicy(sizePolicy);
  25.         frame->setFrameShape(QFrame::StyledPanel);
  26.         frame->setFrameShadow(QFrame::Raised);
  27.  
  28.         verticalLayout_2->addWidget(frame);
  29.  
  30.         tabWidget->addTab(tab_3, QString());
  31.         tab_4 = new QWidget();
  32.         tab_4->setObjectName(QString::fromUtf8("tab_4"));
  33.         verticalLayout_3 = new QVBoxLayout(tab_4);
  34.         verticalLayout_3->setSpacing(6);
  35.         verticalLayout_3->setContentsMargins(11, 11, 11, 11);
  36.         verticalLayout_3->setObjectName(QString::fromUtf8("verticalLayout_3"));
  37.         frame_2 = new QFrame(tab_4);
  38.         frame_2->setObjectName(QString::fromUtf8("frame_2"));
  39.         frame_2->setFrameShape(QFrame::StyledPanel);
  40.         frame_2->setFrameShadow(QFrame::Raised);
  41.  
  42.         verticalLayout_3->addWidget(frame_2);
  43.  
  44.         tabWidget->addTab(tab_4, QString());
  45.  
  46.         verticalLayout->addWidget(tabWidget);
  47.  
  48.         retranslateUi(TestSizeClass);
  49.  
  50.         tabWidget->setCurrentIndex(1);
  51.  
  52.         QMetaObject::connectSlotsByName(TestSizeClass);
  53.     }
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Thanks really much!