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==QApplication==

The [[Qt:Документация 4.3.2/qapplication | QApplication]] class has been split into two classes: [[Qt:Документация 4.3.2/qcoreapplication | QCoreApplication]] and [[Qt:Документация 4.3.2/qapplication | QApplication]]. The new [[Qt:Документация 4.3.2/qapplication | QApplication]] class inherits [[Qt:Документация 4.3.2/qcoreapplication | QCoreApplication]] and adds GUI-related functionality. In practice, this has no consequences for existing Qt applications.

In addition, the following API changes were made:

#[[Qt:Документация 4.3.2/qapplication#allWidgets | QApplication::allWidgets]]() and [[Qt:Документация 4.3.2/qapplication#topLevelWidgets | QApplication::topLevelWidgets]]() used to return a pointer to a [[Qt:Документация 4.3.2/qwidget#QWidgetList-typedef | QWidgetList]]. Now they return a [[Qt:Документация 4.3.2/qwidget#QWidgetList-typedef | QWidgetList]].<br />Also, [[Qt:Документация 4.3.2/qwidget#QWidgetList-typedef | QWidgetList]] has changed from being a typedef for QPtrList<[[Qt:Документация 4.3.2/qwidget | QWidget]]> to being a typedef for [[Qt:Документация 4.3.2/qlist | QList]]<[[Qt:Документация 4.3.2/qwidget | QWidget]] *>. See the [[#qwidgetlist-section | section on QWidgetList]] below for details.<br /><br />For example, if you have code like<br /><source lang="cpp-qt">     QWidgetList *list = QApplication::topLevelWidgets();     QWidgetListIt it(*list);     QWidget *widget;     while ((widget = it.current())) {         if (widget->inherits("MainWindow"))             ((MainWindow *)widget)->updateRecentFileItems();         ++it;     }     delete list;</source> <br />you can rewrite it as<br /><pre>     QWidgetList list = QApplication::topLevelWidgets();     for (int i = 0; i < list.size(); ++i) {         if (MainWindow *mainWin = qobject_cast<MainWindow>(list.at(i)))             mainWin->updateRecentFileItems();     }</pre> 
#[[Qt:Документация 4.3.2/qapplication-qt3#setMainWidget | QApplication::setMainWidget]]() is no longer used. When all an application's windows are closed, the application will exit normally.

=== Вариант ===
<ul>
   <li>какой-то текст
   <pre>
      код строка 1
      код строка 2
   </pre>
   </li>
   <li>еще какой-то текст
   <pre>
      код строка 1
      код строка 2
   </pre>
   </li>
</ul>