This interface is implemented by components that have a single
JRootPane child: JDialog, JFrame, JWindow, JApplet, JInternalFrame.
The methods in this interface are just covers for the JRootPane
properties, e.g. getContentPane() is generally implemented
like this:
public Container getContentPane() {
return getRootPane().getContentPane();
}
This interface serves as a marker for Swing GUI builders
that need to treat components like JFrame, that contain a
single JRootPane, specially. For example in a GUI builder,
dropping a component on a RootPaneContainer would be interpreted
as frame.getContentPane().add(child).
For conveniance
JFrame, JDialog, JWindow,
JApplet and JInternalFrame, by default,
forward, by default, all calls to the add,
remove and setLayout methods, to the
contentPane. This means you can call:
rootPaneContainer.add(component);
instead of:
rootPaneContainer.getContentPane().add(component);
The behavior of the add and
setLayout methods for
JFrame, JDialog, JWindow,
JApplet and JInternalFrame is controlled by
the rootPaneCheckingEnabled property. If this property is
true (the default), then calls to these methods are
forwarded to the contentPane; if false, these
methods operate directly on the RootPaneContainer. This
property is only intended for subclasses, and is therefore protected. |
