CODEWITHSUNDEEP
c++qt
user2653062
user2653062

Reputation: 717

Qt: How to open a new main window on push button click and delete original main window?

I have files main.cpp, MainWindow.h and MainWindow.cpp. I have a push button on this original main window. What I want is when I click on the button, it should take me to a new main window and delete the original main window.

Also I want to follow good programming practices. So I am wondering that should new source and header files like SecondWindow.cpp/.h be created or all this be done in MainWindow.cpp where I have definition of the SLOT on_button_clicked()?

Upvotes: 0

Views: 4869

Answers (2)

Aryanam
Aryanam

Reputation: 1

The answer given by Kuba Ober works.However, you can have only 2 main windows at all times no matter how many times you press the button. It seems to crash the program after the second time you run it. I believe my solution would be better since you can open as many main windows.

At your MainWindow Header:

private:
Ui::MainWindow *ui;
MainWindow *nWin; //Add This bit of code here

As for your triggered event function:

void MainWindow::on_actionNew_triggered()
{
   nWin = new MainWindow;
   nWin->show();

}

That should do it.

Thanks.

Upvotes: 0

Kuba hasn't forgotten Monica
Kuba hasn't forgotten Monica

Reputation: 98425

You need to:

  1. Instantiate the new window and show it.

  2. Delete the current window once the control returns to the event loop.

    void MainWindow::on_button_clicked() {
  auto win = new MainWindow();
  win->setAttribute( Qt::WA_DeleteOnClose );
  win->show();
  deleteLater();
}

  3. Make sure that the initial instance of the window is created on the heap:

    int main(int argc, char** argv) {
  QApplication app(argc, argv);
  auto win = new MainWindow;
  win->setAttribute( Qt::WA_DeleteOnClose );
  win->show(); 
  return app.exec();
}

Upvotes: 2

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