I know, that I can delete QWidget from QLayout so:

        QLayoutItem*item = wlay->takeAt(0);
        wlay->removeItem(item);
        delete item;
        delete w; 

However, without deleting QWidget(delete w), the widget will be on the screen. However, I cant delete the widget, so the widget will be on the screen. How to delete the widget from screen after removing it from layout? For example, I have so code:

class QTest: public QWidget{
    Q_OBJECT

    QVBoxLayout* wlay;
    QPushButton* b;
public:
    QTest(){
        wlay = new QVBoxLayout();
        b = new QPushButton("click");
        for(int i = 0; i < 20; i  )
            wlay->addWidget(new QLabel( "TEST"   QString::number(i)));
        wlay->addWidget(b);
        this->setLayout(wlay);
        connect(b, &QPushButton::clicked, this, &QTest::doit);
    }
public slots:
    void doit();
};
void QTest::doit(){
    //Removing all QLabel from Layout
    for(int i =0; i < 20; i  ){
        QLayoutItem*item = wlay->takeAt(0);
        wlay->removeItem(item);
        delete item;
    }
}

After removing QLabels from layout, labels are showed on screen. How to remove them from main Widget(without deleting them)?

CodePudding user response：

It seems the function you're looking for is QWidget::hide().

Moreover, once you've called QLayout::takeAt(), you don't have to call QLayout::removeItem() afterwards since the former already removes the item as mentioned in the documentation.

You can see QLayout::takeAt() as a shorthand for QLayout::itemAt() QLayout::removeItem().