Java: come rendere lo sfondo Jscrollpane del contenitore non opaco? (ad esempio trasparente)

Question

Questo esempio viene compilato correttamente. E puoi vedere dal farlo funzionare, il problema che sto affrontando. Voglio che JPanels dipinga direttamente sul desktop, senza un riquadro di contenuto JWindow visibile. Ho anche bisogno di un JScrollpane per essere visibile al fine di spostare l'array JPanel in orizzontale!

Apprezzare qualsiasi aiuto.

/* 
* SSCE.java 
* Short Self Contained Example 
* 
* Problem: Cant make the containers scrollpane non-opaque! (ie. transparent) 
*/ 
package fb; 

import com.sun.awt.AWTUtilities; 
import java.awt.Color; 
import java.awt.Container; 
import java.awt.Dimension; 
import java.awt.FlowLayout; 
import java.awt.Toolkit; 
import javax.swing.BorderFactory; 
import javax.swing.JEditorPane; 
import javax.swing.JPanel; 
import javax.swing.JScrollPane; 
import javax.swing.JWindow; 
import javax.swing.ScrollPaneConstants; 

/** 
* 
* @author Aubrey 
*/ 
public class SSCE { 
    JWindow w = new JWindow(); 
    Container c = w.getContentPane(); 
    JPanel[] ps; 
    Toolkit toolkit = Toolkit.getDefaultToolkit(); 
    Dimension dim = toolkit.getScreenSize(); 
    int width = dim.width; 
    int height= dim.height; 

    public SSCE(){ 
    c.setLayout(new FlowLayout(FlowLayout.CENTER, 20, 5)); 

    JScrollPane scrollPane = new JScrollPane(c); 
    scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER); 
    scrollPane.setOpaque(false); 
    ps = new JPanel[19]; 

    for(int i=0; i<19; i++){ 
    ps[i]=new JPanel(); 
    ps[i].setLocation(0, 0); 
    ps[i].setSize(400, 400); 
    ps[i].setVisible(true); 
    JEditorPane area = new JEditorPane(); 
    area.setEditable(false); 
    area.setOpaque(false); 
    area.setSize(400, 400); 
    area.setForeground(Color.WHITE); 

    area.setText("Date: \nFrom: \n\nMessage: "+i); 

    ps[i].add(area); 
    ps[i].setBorder(BorderFactory.createLineBorder(Color.GRAY)); 
    ps[i].setBackground(Color.darkGray); 
    c.add(ps[i]); 

    } 
    if (AWTUtilities.isTranslucencySupported(AWTUtilities.Translucency.TRANSLUCENT)) { 
System.out.println("TranslucencySupported !!!!"); 
AWTUtilities.setWindowOpaque(w, false); 

}else{System.out.println("Translucency NOT Supported !!!!");} 

    //Problem seems to be here --> either the scrollPane or the Container is not non-opaque (ie. transparent)! HOW TO FIX THIS?? 
    w.setContentPane(scrollPane); 
    w.setLocation(0,height-490); 
    w.setSize(width, 450); 

    w.setVisible(true);     
} 
    public static void main(String[] args){ 

     new SSCE(); 
    }} 

Answer 1

fare un tentativo:

scrollPane.getViewport().setOpaque(false); 
    scrollPane.setBorder(null);