Layout Problem

[jpn]

- Call base class constructor in MainWindow ctor
- Where do you apply that mainLayout? Create a "central" widget, set mainLayout as it's layout, and set the "central" widget as mainwindow's central widget.

MainWindow::MainWindow() : QMainWindow()
{
	...
 
	QHBoxLayout* mainLayout = new QHBoxLayout;
	mainLayout->addWidget(first);
	mainLayout->addWidget(second);
	mainLayout->addWidget(third);
 
	QWidget* central = new QWidget;
	central->setLayout(mainLayout);
	setCentralWidget(central);
}

MainWindow::MainWindow() : QMainWindow()
{
	...

	QHBoxLayout* mainLayout = new QHBoxLayout;
	mainLayout->addWidget(first);
	mainLayout->addWidget(second);
	mainLayout->addWidget(third);

	QWidget* central = new QWidget;
	central->setLayout(mainLayout);
	setCentralWidget(central);
}

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