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I thought that layout is just a widget that keeps more widgets inside. But now I find that I can't add it to other widgets using addWidget. For instance how to add a layout to QSplitter?
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The Qt layout system provides a simple and powerful way of automatically arranging child widgets within a widget to ensure that they make good use of the available space.
Widgets are the primary elements for creating user interfaces in Qt. Widgets can display data and status information, receive user input, and provide a container for other widgets that should be grouped together. A widget that is not embedded in a parent widget is called a window.
The Grid LayoutComplex form layouts can be created by placing objects in a grid layout. This kind of layout gives the form designer much more freedom to arrange widgets on the form, but can result in a much less flexible layout.
Detailed Description. QDockWidget provides the concept of dock widgets, also know as tool palettes or utility windows. Dock windows are secondary windows placed in the dock widget area around the central widget in a QMainWindow.
QWidget has built in support for layouts through the layout() and setLayout(...) functions. The layout object controls the positioning of different child widgets that may be added to the layout. In addition, it makes sure to correctly size its parent widget based on the constraints specified. If the layout does not yet have a parent widget, then as soon as the layout is attached to a widget with setLayout(), it will set the size of that parent widget.
But, some widgets are more like a layout manager than a widget, such as QSplitter and QTabWidget. Consider, for example, QSplitter. Although a single widget, it presents two different areas that may be worked with. In this case, a single layout manager for two different areas doesn't really make sense. Like QSplitter, QTabWidget has some behaviors which make a single layout not only unnecessary but not useful.
I think it's the above melding of layout and widget that makes the separation of layout and widget sometimes confusing.
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