析构函数在Qt4 [英] destructors in Qt4

问题描述

我很困惑在Qt4中使用析构函数，希望你们可以帮助我。

当我有一个这样的方法（Des是一个类）：

  void Widget :: create（）{
 Des * test = new Des; 
 test-> show（）; 
} 
  

如何确保这个小部件将被删除

在类Des中我有这样的：

  Des :: Des（）
 {
 QPushButton * push = new QPushButton（neu）; 
 QHBoxLayout * layout = new QHBoxLayout; 
 layout-> addWidget（push）; 
 setLayout（layout）; 
} 
  

在哪里和如何删除* push和*应该在析构函数Des ::〜Des（）？

解决方案

另一个选项使用 deleteLater （）或父母，是使用小部件的关闭时删除功能。在这种情况下，Qt会在显示完成后删除窗口小部件。

  Des * test = new Des; 
 test-> setAttribute（Qt :: WA_DeleteOnClose）; 
 test-> show（）; 
  

我喜欢使用它与Qt保持的对象树，所以我设置delete-关闭窗口，并且窗口中的所有窗口小部件都指定了正确的父级，因此它们也都将被删除。

I'm very confused about using destructors in Qt4 and hope, you guys can help me.
When I have a method like this (with "Des" is a class):

void Widget::create() {
    Des *test = new Des;
    test->show();
}

how can I make sure that this widget is going to be deleted after it was closed?

And in class "Des" i have this:

Des::Des()
{
    QPushButton *push = new QPushButton("neu");
    QHBoxLayout *layout = new QHBoxLayout;
    layout->addWidget(push);
    setLayout(layout);
}

where and how do I have to delete *push and *layout? what should be in the destructor Des::~Des() ?

解决方案

Another option to using deleteLater(), or parents, is to use the delete-on-close functionality for widgets. In this case, Qt will delete the widget when it is done being displayed.

Des *test = new Des;
test->setAttribute( Qt::WA_DeleteOnClose );
test->show();

I like to use it with the object tree that Qt keeps, so that I set delete-on-close for the window, and all widgets in the window have a proper parent specified, so they all get deleted as well.

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