Confused about JRootPane class of java

[Mithun Seth]

Hello Friend,

I need you help to solve one of my confusion which is related to the java classes. I want to e aware about the JRootPane class of java programming. According to my knowledge it most important class of the java. I don't know anything about this JRootPane class. I wonder if you are able to let me know something about JRootPane class of java along with suitable example. I am waiting for your reply.

[Praetor]

A JRootPane is a lightweight container used behind the scenes by JFrame, JDialog, JWindow, JApplet, and JInternalFrame. If you replace the LayoutManager of the JRootPane, you are responsible for managing all of these views. So ordinarily you will want to be sure that you change the layout manager for the contentPane rather than for the JRootPane itself. The painting architecture of Swing requires an opaque JComponent to exist in the containment hieararchy above all other components.

[Katty]

Please study following simple example of JRootPane class of java:

import javax.swing.JRootPane;
import javax.swing.JFrame;

public class JRootPaneDemo
 {

  public static void main(final String args[]) {
    JFrame JN = new JFrame("Adornment Example");
    JN.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JN.setUndecorated(true);
    JN.getRootPane().setWindowDecorationStyle(JRootPane.FRAME);
    JN.setSize(200, 100);
    JN.setVisible(true);

  }
}

[kelfro]

Hi friend,

Please refer following some mostly used methods of JRootPane class:

• setWindowDecorationStyle(int StylewindowDecoration)
• setUI(RootPaneUI rui)
• setMenuBar(JMenuBar jmenu)
• setLayeredPane(JLayeredPane jlyrdpane)
• setJMenuBar(JMenuBar jmenu)
• setGlassPane(Component gls)

[Zecho]

Hi,

The following example of JRootPane class shows the implementation of addAncestorListener():

javax.swing.JRootPane
public class JRootDMN {
  public static void main (String args[]) {
    JFrame FE = new JFrame("Ancestor Sampler");
    FE.setDeFEaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    AncestorListener ancestorListener1 = new AncestorListener() {
      public void ancestorAdded(AncestorEvent ancestorEvent) {
        System.out.println ("Added");
      }
      public void ancestorMoved(AncestorEvent ancestorEvent) {
        System.out.println ("Moved");
      }
      public void ancestorRemoved(AncestorEvent ancestorEvent) {
        System.out.println ("Removed");
      }
    };
    FE.getRootPane().addAncestorListener(ancestorListener);
    FE.getRootPane().setVisible(FEalse);
    FE.getRootPane().setVisible(true);
    FE.setSize (400, 200);
    FE.setVisible (true);
  }

[Reegan]

A JRootPane class of java support various nested classes, see below:

1. JRootPane.AccessibleJRootPane
2. Component.BaselineResizeBehavior
3. JRootPane.RootLayout
4. JComponent.AccessibleJComponent
5. Container.AccessibleAWTContainer
6. Component.FlipBufferStrategy