Изменение размеров виджета при изменении размеров окна

void setupUi(QMainWindow *clientClass)
{
    if (clientClass->objectName().isEmpty())
        clientClass->setObjectName(QString::fromUtf8("clientClass"));
    clientClass->resize(600, 400);
    centralwidget = new QWidget(clientClass);
    centralwidget->setObjectName(QString::fromUtf8("centralwidget"));
    gridLayoutWidget = new QWidget(centralwidget);
    gridLayoutWidget->setObjectName(QString::fromUtf8("gridLayoutWidget"));
    gridLayoutWidget->setGeometry(QRect(10, 10, 581, 371));
    gridLayout = new QGridLayout(gridLayoutWidget);
    gridLayout->setObjectName(QString::fromUtf8("gridLayout"));
    gridLayout->setContentsMargins(0, 0, 0, 0);
    textEdit = new QTextEdit(gridLayoutWidget);
    textEdit->setObjectName(QString::fromUtf8("textEdit"));
 
    gridLayout->addWidget(textEdit, 0, 0, 1, 1);
 
    textEdit_2 = new QTextEdit(gridLayoutWidget);
    textEdit_2->setObjectName(QString::fromUtf8("textEdit_2"));
 
    gridLayout->addWidget(textEdit_2, 0, 2, 1, 1);
 
    textEdit_3 = new QTextEdit(gridLayoutWidget);
    textEdit_3->setObjectName(QString::fromUtf8("textEdit_3"));
 
    gridLayout->addWidget(textEdit_3, 2, 0, 1, 1);
 
    textEdit_4 = new QTextEdit(gridLayoutWidget);
    textEdit_4->setObjectName(QString::fromUtf8("textEdit_4"));
 
    gridLayout->addWidget(textEdit_4, 2, 2, 1, 1);
 
    verticalSpacer = new QSpacerItem(20, 40, QSizePolicy::Minimum, QSizePolicy::Expanding);
 
    gridLayout->addItem(verticalSpacer, 1, 0, 1, 1);
 
    horizontalSpacer = new QSpacerItem(40, 20, QSizePolicy::Expanding, QSizePolicy::Minimum);
 
    gridLayout->addItem(horizontalSpacer, 0, 1, 1, 1);
 
    clientClass->setCentralWidget(centralwidget);
    statusbar = new QStatusBar(clientClass);
    statusbar->setObjectName(QString::fromUtf8("statusbar"));
    clientClass->setStatusBar(statusbar);
 
    retranslateUi(clientClass);
 
    QMetaObject::connectSlotsByName(clientClass);
} // setupUi