[英]Java: how to make container's Jscrollpane background not opaque? (ie. transparent)
This example compiles fine. 这个例子很好。 And you can see from running the it, the problem I'm facing. 你可以从运行它看到我面临的问题。 I want the JPanels to paint directly on the Desktop, without a visible JWindow content pane. 我希望JPanels直接在桌面上绘制,而没有可见的JWindow内容窗格。 I also need a JScrollpane to be visible in order to shift through the JPanel array horizontally! 我还需要一个JScrollpane才能看到,以便横向移动JPanel数组!
Appreciate any help. 感谢任何帮助。
/*
* 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();
}}
Give it a try: 试试看:
scrollPane.getViewport().setOpaque(false);
scrollPane.setBorder(null);
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