Does addwidgets means the make a widget become the parent of another widget

hehedaozuiteng

Hi all. sorry if my quesion silly, I am confuze about the relation between the different widgets.

does the following coda means the same thing in a QT widget application ?

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
   QGridLayout *layout = new QGridLayout;
   QCustomWidgets *qcw = new QCustomWidget();   
    layout->addWidget(qcw);
    ui->awidget->setLayout(layout);
}

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
   QGridLayout *layout = new QGridLayout;
   QCustomWidgets *qcw = new QCustomWidget(this);   
    layout->addWidget(qcw);
    ui->awidget->setLayout(layout);
}

when I called the

ui->awidget->setLayout(layout)

in first code, the *qcw 's parent widget becomes ui->awidget, so I can operating it as the ui->awidget->*qcw(maybe not, I have to store it in mainwidow's h file?).

In second code, the *qcw 's parent widget becomes ui->awidget from MainWindow.

I get it, I am correct.

SGaist

Hi,

When you add a widget to a layout the ownership is transferred to the layout. When you call setLayout, the owner of the layout becomes the widget on which you call setLayout.

If you want to access a widget that you add in the constructor of your designer based widget, then yes, make it a member variable of your class.