make child widget resizable

I want to make child widgets re-sizable along with the parent. Could you help me ?

This is my widget constructor:

Code:

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CustomWidget::CustomWidget(QWidget *parent) :
    QWidget(parent)
{
 
    m_button_edit.setText(tr("Edit"));
    m_button_all.setText(tr("All"));
    m_button_cancel.setText(tr("Cancel"));
 
 
    InitializeModels();
 
    m_table1 = new QTableView(this);
    m_table2 = new QTableView(this);
 
    SetTables();
 
    QSplitter *splitter = new QSplitter(Qt::Vertical, this);
    splitter->addWidget(m_table1);
    QWidget *temp = new QWidget(this);
    QGridLayout *layout_table2 = new QGridLayout(this);
    layout_table2->addWidget(m_table2, 0, 0, 1, 3);
    layout_table2->addWidget(&m_button_edit,   1, 0, 1, 1);
    layout_table2->addWidget(&m_button_all,    1, 1, 1, 1);
    layout_table2->addWidget(&m_button_cancel, 1, 2, 1, 1);
    temp->setLayout(layout_table2);
    splitter->addWidget(temp);
 
}

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I got some small window which I should stretch to see the items inside and they have a fixed size.
If you have any other suggestion about better approach in setting widget positions than in my case I would be glad if you share.

You need to put a layout on the container widget and add the splitter to it:

Code:

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// at bottom of constructor
QHBoxLayout *lo = new QHBoxLayout(this);
lo->addWidget(splitter);
setLayout(lo);

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