Creating the QListView instance without a parent

[yashaka]

Hi, I found in many Qt-examples, either from the Official Documentation, or from the books, that the QListView (or any other View) can be created dinamically without specifying the parent, like here:

QListView *listView = new QListView;
listView->setModel(&model); // model was created previously on the stack

QListView *listView = new QListView;
listView->setModel(&model); // model was created previously on the stack

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So the question is: why have it sense?

[high_flyer]

The parent defines the context in which a widget is created.
If it has a parent, it will be drwan in its parent context.
If it has no parent. it will become a top level window.
For non visual QObjects, parents will delete their children when they them selves get destroyed, which makes your code safer and cleaner.

[yashaka]

Thank you! You made me think about this ones more and I found that didn't draw attention to the fact that in all that examples the following code happens a bit further:

hboxLayout->addWidget(listView);
mainWgt.setLayout(hboxLayout);

hboxLayout->addWidget(listView);
mainWgt.setLayout(hboxLayout);

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So listView will be safely deleted when mainWgt will close.