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Is it possible to keep a QWidget open after close button clicked? Suppose that widget is main widget. i.e. not child of another widget.
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Detailed Description. Close events are sent to widgets that the user wants to close, usually by choosing "Close" from the window menu, or by clicking the X title bar button. They are also sent when you call QWidget::close() to close a widget programmatically.
You can in closeEvent() of your widget B emit your own signal widgetBClose() and then connect to this signal in widget A and do what you want in this slot. A closed QWidget is hidden (i.e. not visible on screen) by definition, so, as @Kxyu said, QWidget::isVisible() can indicate whether a QWidget is closed.
UNSOLVED How To Close All Window To quit, you can use void QCoreApplication::quit() [static slot] , see http://doc.qt.io/Qt-5/qcoreapplication.html#quit.
I would try to:
void Widget::closeEvent(QCloseEvent *event)
{
[..]
event->ignore();
}
As documentation say:
"For example, you can prevent the window from closing by calling ignore() on all events."
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