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).
* * As a convenience, the standard classes that implement this interface * (such as {@code JFrame}, {@code JDialog}, {@code JWindow}, {@code JApplet}, * and {@code JInternalFrame}) have their {@code add}, {@code remove}, * and {@code setLayout} methods overridden, so that they delegate calls * to the corresponding methods of the {@code ContentPane}. * For example, you can add a child component to a frame as follows: *
* frame.add(child); ** instead of: *
* frame.getContentPane().add(child); **
* 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.
*
* @see JRootPane
* @see JFrame
* @see JDialog
* @see JWindow
* @see JApplet
* @see JInternalFrame
*
* @author Hans Muller
* @since 1.2
*/
public interface RootPaneContainer
{
/**
* Return this component's single JRootPane child. A conventional
* implementation of this interface will have all of the other
* methods indirect through this one. The rootPane has two
* children: the glassPane and the layeredPane.
*
* @return this components single JRootPane child.
* @see JRootPane
*/
JRootPane getRootPane();
/**
* The "contentPane" is the primary container for application
* specific components. Applications should add children to
* the contentPane, set its layout manager, and so on.
*
* The contentPane may not be null. *
* Generally implemented with
* getRootPane().setContentPane(contentPane);
*
* @exception java.awt.IllegalComponentStateException (a runtime
* exception) if the content pane parameter is null
* @param contentPane the Container to use for the contents of this
* JRootPane
* @see JRootPane#getContentPane
* @see #getContentPane
*/
void setContentPane(Container contentPane);
/**
* Returns the contentPane.
*
* @return the value of the contentPane property.
* @see #setContentPane
*/
Container getContentPane();
/**
* A Container that manages the contentPane and in some cases a menu bar.
* The layeredPane can be used by descendants that want to add a child
* to the RootPaneContainer that isn't layout managed. For example
* an internal dialog or a drag and drop effect component.
*
* The layeredPane may not be null. *
* Generally implemented with
* getRootPane().setLayeredPane(layeredPane);
*
* @exception java.awt.IllegalComponentStateException (a runtime
* exception) if the layered pane parameter is null
* @see #getLayeredPane
* @see JRootPane#getLayeredPane
*/
void setLayeredPane(JLayeredPane layeredPane);
/**
* Returns the layeredPane.
*
* @return the value of the layeredPane property.
* @see #setLayeredPane
*/
JLayeredPane getLayeredPane();
/**
* The glassPane is always the first child of the rootPane
* and the rootPanes layout manager ensures that it's always
* as big as the rootPane. By default it's transparent and
* not visible. It can be used to temporarily grab all keyboard
* and mouse input by adding listeners and then making it visible.
* by default it's not visible.
* * The glassPane may not be null. *
* Generally implemented with
* getRootPane().setGlassPane(glassPane);
*
* @see #getGlassPane
* @see JRootPane#setGlassPane
*/
void setGlassPane(Component glassPane);
/**
* Returns the glassPane.
*
* @return the value of the glassPane property.
* @see #setGlassPane
*/
Component getGlassPane();
}