#include <QApplication>
#include <QDebug>
#include <QWidget>
#include <QTextEdit>
#include <QLineEdit>
#include <QPushButton>
#include <QBoxLayout>
#include <QLabel>class Widget:public QWidget{QPushButton* but;Widget* other;
public:Widget();void setother(Widget& w);void buttext(const char* text);void click();
};Widget::Widget() : other(NULL)
{but = new QPushButton(this);QVBoxLayout lay;lay.addWidget(this);QObject::connect(but, &QPushButton::clicked, this, &Widget::click);}void Widget::setother(Widget& w)
{other=&w;
}void Widget::buttext(const char* text)
{but->setText(text);
}void Widget::click()
{this->hide();if (other) {other->show();}
}int main(int argc,char** argv)
{QApplication app(argc,argv);Widget w1,w2;w1.buttext("w1.but");w2.buttext("w2.but");w1.setother(w2);w2.setother(w1);w1.show();return app.exec();
}
