问题
Look at this picture :
![\"Transparent](\"https://i.stack.imgur.com/39t12.png\")
here is the code that transparent\'s the frame:
GraphicsEnvironment ge =
GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gd = ge.getDefaultScreenDevice();
if (!gd.isWindowTranslucencySupported(TRANSLUCENT)) {
System.err.println(
\"Translucency is not supported\");
System.exit(0);
}
JFrame.setDefaultLookAndFeelDecorated(true);
this works good but when trying to enable LookAndFeel by adding
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if (\"Nimbus\".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
}catch(.......)
it gives me this error
Exception in thread \"AWT-EventQueue-0\" java.awt.IllegalComponentStateException: The frame is decorated
What\'s this error ? and how to solve it ?
Thanks for your answers and suggestions.
EDIT
Question Asked/CrossPosted
OTN
Daniweb
CodeRanch
回答1:
accepted answer by @JamesCherrill on Daniweb,
1st. Top-Level Container created on InitialThread must be decorated and isDisplayable(), then after is possible whatever with rest of
problably required short delaying by Swing Timer
.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Ellipse2D;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class DemoWindows implements ActionListener {
public static void main(String[] args) {
// create a new demo, and update it every 50 mSec
new Timer(30, new DemoWindows()).start();
}
int phase = 0; // demo runs a number of consecutive phases
int count = 0; // each of which takes a number of timesteps
JFrame window1 = new JFrame("Java windows demo");
JLabel text1 = new JLabel("<HTML><H1>Hello" + "<BR>Everyone");
// "<HTML><H1>This is a demo of some of the effects"
// + "<BR>that can be achieved with the new Java"
// + "<BR>transparent window methods</H1>"
// + "<BR>(requires latest version of Java)");
JFrame window2 = new JFrame("Java windows demo");
JLabel text2 = new JLabel("<HTML><center>Java<BR>rocks");
JButton button = new JButton("Whatever");
int w, h, r, x, y; // parameters of iris circle
DemoWindows() {
// build and diplay the windows
window1.add(text1);
window1.pack();
window1.setLocationRelativeTo(null);
window1.setVisible(true);
window2.setUndecorated(true);
window2.setBackground(new Color(0, 0, 0, 0)); // alpha <1 = transparent
window2.setOpacity(0.0f);
text2.setFont(new Font("Arial", 1, 60));
text2.setForeground(Color.red);
window2.add(text2);
window2.add(button, BorderLayout.SOUTH);
window2.pack();
window2.setLocationRelativeTo(null);
window2.setVisible(true);
// parameters of the smallest circle that encloses window2
// this is the starting pouint for the "iris out" effect
w = window2.getWidth();
h = window2.getHeight();
r = (int) Math.sqrt(w * w + h * h) / 2; // radius
x = w / 2 - r; // top left coordinates of circle
y = h / 2 - r;
}
@Override
public void actionPerformed(ActionEvent e) {
try {// L&F changed on Runtime, repeatly fired from Swing Timer
UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
} catch (ClassNotFoundException ex) {
Logger.getLogger(DemoWindows.class.getName()).log(Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
Logger.getLogger(DemoWindows.class.getName()).log(Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
Logger.getLogger(DemoWindows.class.getName()).log(Level.SEVERE, null, ex);
} catch (UnsupportedLookAndFeelException ex) {
Logger.getLogger(DemoWindows.class.getName()).log(Level.SEVERE, null, ex);
}
SwingUtilities.updateComponentTreeUI(window2);
// called by timer 20 times per sec
// goes thru a number of phases, each a few seconds long
switch (phase) {
case 0: { // initial pause
if (++count > 50) {
phase = 1; // go to next phase
count = 0;
}
break;
}
case 1: { // fade in
if (++count < 100) {
window2.setOpacity(0.01f * count);
} else {
phase = 2; // go to next phase
count = 0;
}
break;
}
case 2: { // move
if (++count < 160) {
if (count < 28 || count > 80) {// pause for best effect
window2.setLocation(window2.getX() + 1, window2.getY() + 1);
}
} else {
phase = 3; // go to next phase
count = 0;
}
break;
}
case 3: {// iris out
if (++count < r) {
Shape shape = new Ellipse2D.Double(
x + count, y + count, 2 * (r - count), 2 * (r - count));
window2.setShape(shape);
} else {
phase = 99; // go to final (exit) phase
}
break;
}
case 99:
System.exit(0);
}
}
}
回答2:
Change the laf in the main method before ui is created by @Sri Harsha Chilakapati
and @Sri Harsha Chilakapati I am sorry but I didn't get you I'll be appreciated if you describe more by @Azad Omer
more in Oracle tutorial Modifying the Look and Feel,
issue is caused code line
JFrame.setDefaultLookAndFeelDecorated(true);, required to disable/comment this code line//JFrame.setDefau...by default there no issue to create translucent JFrame with Nimbus L&F
from code
import java.awt.*;
import javax.swing.*;
public class TranslucentWindow extends JFrame {
private static final long serialVersionUID = 1L;
public TranslucentWindow() {
super("Test translucent window");
setLayout(new FlowLayout());
add(new JButton("test"));
add(new JCheckBox("test"));
add(new JRadioButton("test"));
add(new JProgressBar(0, 100));
JPanel panel = new JPanel() {
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 300);
}
private static final long serialVersionUID = 1L;
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.red);
g.fillRect(0, 0, getWidth(), getHeight());
}
};
panel.add(new JLabel("Very long textxxxxxxxxxxxxxxxxxxxxx "));
add(panel);
pack();
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
try {
for (UIManager.LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (Exception e) {
e.printStackTrace();
}
//JFrame.setDefaultLookAndFeelDecorated(true);
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
Window w = new TranslucentWindow();
w.setVisible(true);
com.sun.awt.AWTUtilities.setWindowOpacity(w, 0.7f);
}
});
}
}
回答3:
After some researching I find out that the problem is between JDK7 and com.sun.awt.AWTUtilities, I think we'v better to not use com.sun packages except as a last resort as they may cause problems with upgrading JDK versions (they are not part of JDK API).
Read more about this issues Here
From Oracle
The Nimbus look-and-feel for Swing was introduced in JDK 6u10 as a replacement for the old Metal LoF. With JDK 7, Nimbus will be moved from an Oracle-proprietary extension (com.sun.java.swing) to a standard API (javax.swing) so that it becomes a true first class Swing citizen.
It seems to be com.sun.awt.AWTUtilities works fine with JDK6 but Nimbus LAF is in JDK7.
Ills of less I find out the answer of my first question (What's this error), and for the second question(How to solve it) I must wait till new version of com.sun release.
I am grateful for mKorbel's efforts, thank you .
来源：https://stackoverflow.com/questions/16219111/cant-transparent-and-undecorated-jframe-in-jdk7-when-enabling-nimbus