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最新推荐文章于 2021-07-17 23:32:25 发布

l176266956

最新推荐文章于 2021-07-17 23:32:25 发布

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分类专栏： QT 文章标签： basic qt each interface button windows

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WHAT'S WIDGET IN QT?

Widgets are the basic building blocks of graphical user interface (GUI) applications made with Qt. Each GUI component , such as a button, label or text editor, is a widget and can be placed within an existing user interface or displayed as an independent window. Each type of component is provided by a particular subclass of QWidget , which is itself a subclass of QObject .

QWidget is not an abstract class ; it can be used as a container for other widgets, and can be subclassed with minimal effort to create custom widgets. It is most often used to create windows in which other widgets are placed.

As with QObject s, widgets can be created with parent objects to indicate ownership, ensuring that objects are deleted when they are no longer used. With widgets, these parent-child relationships have an additional meaning: each child is displayed within the screen area occupied by its parent. This means that, when a window is deleted, all the widgets it contains are automatically deleted.