September 29, 2011

xeroblast xeroblast
Lab Rat
91 posts
  • Groupie L1

[SOLVED] closing the whole application on another window

 

hi,

ive been trying to do this half-of-my-day already but to no avail. i want to close/quit the whole application in a child dialog but the main window isnt close.

#mainwindow

  1. #include "mainwindow.h"
  2. #include "ui_mainwindow.h"
  3. #include "dialog.h"
  4.  
  5. MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow)
  6. {
  7.     ui->setupUi(this);
  8.  MainWindow::openDialog();
  9. }
  10.  
  11. MainWindow::~MainWindow()
  12. {
  13.     delete ui;
  14. }
  15.  
  16. void MainWindow::openDialog()
  17. {
  18.  Dialog *d = new Dialog();
  19.  if (d->exec() == 0) {
  20.   qApp->quit();
  21.  }
  22. }

the child window

  1. #include "dialog.h"
  2. #include "ui_dialog.h"
  3.  
  4. Dialog::Dialog(QWidget *parent) : QDialog(parent), ui(new Ui::Dialog)
  5. {
  6.     ui->setupUi(this);
  7.  connect(ui->pushButtonReject, SIGNAL(clicked()), this, SLOT(reject()));
  8.  connect(ui->pushButtonAccept, SIGNAL(clicked()), this, SLOT(accept()));
  9. }
  10.  
  11. Dialog::~Dialog()
  12. {
  13.     delete ui;
  14. }

so when i click the Reject button, the whole application should close but the main window is still open. what went wrong?
the Accept button should keep the main window open. how do i achieve this?

thanx.

5 replies

September 29, 2011

xeroblast xeroblast
Lab Rat
91 posts
  • Groupie L1

hello again, i came up with something like this

#mainwindow

  1. #include "mainwindow.h"
  2. #include "ui_mainwindow.h"
  3. #include "dialog.h"
  4.  
  5. MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow)
  6. {
  7.  if (MainWindow::openDialog()) {
  8.   ui->setupUi(this);
  9.  } else {
  10.   qApp->quit();
  11.  }
  12. }
  13.  
  14. MainWindow::~MainWindow()
  15. {
  16.     delete ui;
  17. }
  18.  
  19. bool MainWindow::openDialog()
  20. {
  21.  Dialog *d = new Dialog(this);
  22.  return d->exec();
  23. }

#child window

  1. #include "dialog.h"
  2. #include "ui_dialog.h"
  3.  
  4. Dialog::Dialog(QWidget *parent) : QDialog(parent), ui(new Ui::Dialog)
  5. {
  6.  ui->setupUi(this);
  7.  connect(ui->pushButtonReject, SIGNAL(clicked()), this, SLOT(reject()));
  8.  connect(ui->pushButtonAccept, SIGNAL(clicked()), this, SLOT(accept()));
  9. }

the Accept button works perfectly but the Reject button is not. there is still a small empty dialog when i click the Reject button.

September 29, 2011

Eus Eus
Lab Rat
121 posts

I don’t know what your idea is, so not sure if that would work for you, but why don’t you try using QMessageBox [doc.qt.nokia.com] instead? You can grab the output of the buttons clicked in your app and based on that quit, save, etc….

September 29, 2011

Lukas Geyer Lukas Geyer
Gene Splicer
2074 posts
  • Groupie L1

Why do you open a MainWindow in the first place? Just open the dialog before you create and show the main window.

  1. int main(int argc, char* argv[])
  2. {
  3.     QApplication application(argc, argv);
  4.  
  5.     Dialog dialog;
  6.     if(dialog.exec() == 0)
  7.         return -1;
  8.  
  9.     MainWindow mainWindow;
  10.     mainWindow.show();
  11.  
  12.     return application.exec();
  13. }

September 30, 2011

Volker Volker
Robot Herder
5428 posts
  • Qt DevNet Moderator
  • Certified Specialist

If you call quit() on a QApplication before you started the main event loop by calling app.exec(), the call to quit does nothing. This means, that when you eventually return to your main function and call app.exec() it will be the same as if app.quit() has never been called.

 Signature 

http://www.catb.org/~esr/faqs/smart-questions.html

September 30, 2011

xeroblast xeroblast
Lab Rat
91 posts
  • Groupie L1

thanks Volker for the explanation. i get it now why the quit() doesnt work. i was stuck on that.

Lukas Geyer : thanks, i was thinking about last night that editing my main.cpp would do the trick.

Eus : im doing a login dialog first, if dialog is cancel/close as so as the mainwindow.

 
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