In the heir class, QWidget added the following field:
QPushButton *m_sendButton = new QPushButton("Отправить", this); 
Yes, this is normal behavior . And they fall not on the layout, but on the QWidget (the parent, the one that this ).
If parent is 0, the new widget becomes a window. If parent is another widget, this widget becomes a child window inside parent .
Layout itself assigns the parent to widgets, and itself only controls their positioning.
When constructing the child widgets. The layout will automatically replicate the widgets (using QWidget :: setParent ()).
How to correctly write out here .
Example:
QWidget *window = new QWidget; QPushButton *button1 = new QPushButton("One"); QLineEdit *lineEdit1 = new QLineEdit(); QPushButton *button2 = new QPushButton("Two"); QLineEdit *lineEdit2 = new QLineEdit(); QPushButton *button3 = new QPushButton("Three"); QLineEdit *lineEdit3 = new QLineEdit(); QFormLayout *layout = new QFormLayout; layout->addRow(button1, lineEdit1); layout->addRow(button2, lineEdit2); layout->addRow(button3, lineEdit3); window->setLayout(layout); window->show(); 
QLayout is just an auxiliary class that defines the position and size of slave widgets based on the geometry of their parent and neighbors.
In the case of adding widgets, the direct task of the parent (via setParent() ), bypassing the layout, no one controls their geometry and they are positioned solely by manually changing their position ( move() ) and size ( resize() ) by the program.
Source: https://ru.stackoverflow.com/questions/556383/
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