h:
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
QMdiArea *ar;
void contextMenuEvent(QContextMenuEvent* pe) {add();}
public slots:
void add();
private:
Ui::MainWindow *ui;
};
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
ar = new QMdiArea(this);
setCentralWidget(ar);
add();
QTimer *t = new QTimer(this);
connect(t, SIGNAL(timeout()), this, SLOT(add()));
t->start(100);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::add()
{
qDebug("add");
ar->addSubWindow(new QWidget());
}
Нужно делать так:
QWidget *child = new QWidget();
ar->addSubWindow(child);
child->show();
QMdiSubWindow *sub = ar->addSubWindow(child);
sub->show(); // командуем субокну, а не виджету
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