Qt - remove all widgets from layout?

Question

This doesn\'t seem easy. Basically, I add QPushButtons through a function to a layout, and when the function executes, I want to clear the layout first (removi

Answer 1

If you don't do anything funny when adding widgets to layouts and layouts to other layouts they should all be reparented upon addition to their parent widget. All QObjects have a deleteLater() slot which will cause the QObject to be deleted as soon as control is returned to the event loop. Widgets deleted in this Manor also delete their children. Therefore you simply need to call deleteLater() on the highest item in the tree.

in hpp

QScrollArea * Scroll;

in cpp

void ClearAndLoad(){
    Scroll->widget()->deleteLater();
    auto newLayout = new QVBoxLayout;
    //add buttons to new layout
    auto widget = new QWidget;
    widget->setLayout(newLayout);
    Scroll->setWidget(widget);
}

also note that in your example the _layout is a local variable and not the same thing as the _layout in the header file (remove the QVBoxLayout* part). Also note that names beginning with _ are reserved for standard library implementers. I use trailing _ as in var_ to show a local variable, there are many tastes but preceding _ and __ are technically reserved.