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The questions says it all. Say I have a layout
mylayout
|-- widgetA
`-- widgetB
How do I insert a new widget to this tree?
mylayout
|-- widgetA
|-- widgetC
`-- widgetB
513
To set the layout on the parent widget, you need to drop the ->layout() : twInputMethodsTabs->value(1). first->addLayout(hblParams); Note that since you are now adding an empty layout to the widget, any widgets current in the previous layout will be lost, so you may need to re-add the widgets to the layout.
You can add QPushbutton to central widget by passing its object name. QPushButton *PB=new QPushButton(ui->centralwidgetobjectname); PB. show(); Otherwise create layout inside Central widget then using addwidget function to add Qpushbutton.
Stretch factors are used to change how much space widgets are given in proportion to one another. If we apply stretch factors to each widget, they will be laid out in proportion (but never less than their minimum size hint), e.g.
The QVBoxLayout class lines up widgets vertically. This class is used to construct vertical box layout objects. See QBoxLayout for details.
You should use QBoxLayout::insertWidget.
The index is zero-based,
it means the number of the widget before which the new one will be inserted.
Or, you can think of it as what the index of the inserted item will become.
In this particular case you have:
layout.addWidget(widgetA)
layout.addWidget(widgetB)
layout.insertWidget(1, widgetC)
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