[英]JProgressBar doesn't update , can't find a clue
nice job , now i just wanna know why if i add into while loop the instruction System.out.println below the progress is shown on both , cmd and Pgbar in the Gui ?? 很好的工作,现在我只想知道为什么如果我加入while循环指令System.out.println下面的进度显示在两个,cmd和Pgbar在桂? : :
while(progress < 99){
System.out.println("into while of PBar Thread progress = "+progress);
if(progress != Path.operationProgress){
operationProgressBar.setValue(progress);
progress = Path.operationProgress;
operationProgressBar.repaint(); } }
need some help around , i can't get the JProgressBar to update, i can't use SwingWorker, i have to solve this without it . 需要一些帮助,我不能让JProgressBar更新,我不能使用SwingWorker,我必须解决这个没有它。 the variable Path.operationProgress is a static variable from a "Path" class instance, and it's updated from another thread, so i think the PBar and Path instances are both executed in user's Threads and not in the EDT . 变量Path.operationProgress是来自“Path”类实例的静态变量,它是从另一个线程更新的,所以我认为PBar和Path实例都是在用户的线程中执行而不是在EDT中执行。 here is the Code of the progress bar : 这是进度条的代码:
import javax.swing.*; public class Pbar extends Thread { JProgressBar operationProgressBar; public Pbar(JProgressBar operationProgressBar) { this.operationProgressBar = operationProgressBar; } @Override public void run() { int progress = Path.operationProgress; while(progress < 99) { if(progress != Path.operationProgress) { operationProgressBar.setValue(progress); progress = Path.operationProgress; operationProgressBar.repaint(); }}} }
this is the action that launches the threads : 这是启动线程的操作:
private javax.swing.JProgressBar operationProgressBar; private javax.swing.JLabel pathImage; private javax.swing.JButton simulatedAnnelingButton; public class TSPGUI extends javax.swing.JFrame { TSPMG tspInstance; Path p, result; String filename = ""; int neighborHood_Type = 1, i = 0; // ......Constructor Stuff and init() private void simulatedAnnelingButtonActionPerformed(java.awt.event.ActionEvent evt)
{ {
Thread sa = new Thread(){ @Override public void run(){ result = p.SimulatedAnnealing(neighborHood_Type); 线程sa = new Thread(){@ Override public void run(){result = p.SimulatedAnnealing(neighborHood_Type); String lastCostString = result.Cost() + ""; String lastCostString = result.Cost()+“”; lastCostLabel.setText(lastCostString); lastCostLabel.setText(lastCostString); }}; }}; sa.start(); sa.start(); Pbar pb = new Pbar(operationProgressBar); Pbar pb = new Pbar(operationProgressBar); pb.start(); pb.start(); } //Some other Stuff ... } } //其他一些东西......}
If you can't use SwingWorker
then use SwingUtilities.invokeLater
, eg: 如果您不能使用SwingWorker
使用SwingUtilities.invokeLater
,例如:
if (progress != Path.operationProgress) {
final int progressCopy = progress; // Probably not final so copy is needed
SwingUtilities.invokeLater(new Runnable() {
@Override
void run() {
operationsProgressBar.setValue(progressCopy);
}
});
}
Note: When doing this, everything used in run
has to be final or there have to be other measures to access the variables. 注意:执行此操作时, run
中使用的所有内容都必须是最终的,或者必须有其他度量来访问变量。 This code is symbolic in that regard. 在这方面,这段代码具有象征意义。
You need to do operations on Swing components outside the event dispatching thread, there is no way around this. 你需要在事件调度线程之外对Swing组件进行操作,没有办法解决这个问题。
I would use a PropertyChangeListener to allow you to make the annealing progress value a "bound" property of the class. 我将使用PropertyChangeListener来允许您使退火进度值成为类的“绑定”属性。 Than any observer can follow this property if desired. 如果需要,任何观察者都可以遵循此属性。 For example: 例如:
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.*;
import javax.swing.event.SwingPropertyChangeSupport;
@SuppressWarnings("serial")
public class TspGui2 extends JPanel {
private static final String ANNEALING_PROGRESS = "Annealing Progress";
private JProgressBar progBar = new JProgressBar(0, 100);
private JLabel valueLabel = new JLabel();
private JButton beginAnnealingBtn = new JButton("Begin Annealing");
private MyAnnealing myAnnealing = new MyAnnealing(this);
public TspGui2() {
beginAnnealingBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
beginAnnealing();
}
});
myAnnealing.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
if (evt.getPropertyName().equals(MyAnnealing.ANNEALING)) {
// be sure this is done on the EDT
SwingUtilities.invokeLater(new Runnable() {
public void run() {
int annealedValue = myAnnealing.getAnnealedValue();
setValue(annealedValue);
if (annealedValue >= MyAnnealing.MAX_ANNEALED_VALUE) {
beginAnnealingBtn.setEnabled(true);
}
}
});
}
}
});
progBar.setString(ANNEALING_PROGRESS);
progBar.setStringPainted(true);
JPanel northPanel = new JPanel(new GridLayout(1, 0));
northPanel.add(beginAnnealingBtn);
northPanel.add(valueLabel);
setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
add(northPanel);
add(progBar);
}
public void setValue(int value) {
valueLabel.setText("Value:" + value);
progBar.setValue(value);
}
public void beginAnnealing() {
beginAnnealingBtn.setEnabled(false);
setValue(0);
myAnnealing.reset();
new Thread(new Runnable() {
public void run() {
myAnnealing.beginAnnealing();
}
}).start();
}
private static void createAndShowGui() {
TspGui2 mainPanel = new TspGui2();
JFrame frame = new JFrame("TspGui2");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
class MyAnnealing {
public static final String ANNEALING = "Annealing";
public static final int MAX_ANNEALED_VALUE = 100;
private SwingPropertyChangeSupport propChangeSupport =
new SwingPropertyChangeSupport(this);
private TspGui2 gui;
private int annealedValue;
public MyAnnealing(TspGui2 gui) {
this.gui = gui;
}
public void addPropertyChangeListener(
PropertyChangeListener listener) {
propChangeSupport.addPropertyChangeListener(listener);
}
public void removePropertyChangeListener(
PropertyChangeListener listener) {
propChangeSupport.removePropertyChangeListener(listener);
}
public void reset() {
setAnnealedValue(0);
}
// simulate some long process...
public void beginAnnealing() {
long sleepDelay = 100;
while (annealedValue < MAX_ANNEALED_VALUE) {
setAnnealedValue(annealedValue + 1);
try {
Thread.sleep(sleepDelay);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public int getAnnealedValue() {
return annealedValue;
}
private void setAnnealedValue(int value) {
final int oldValue = this.annealedValue;
this.annealedValue = value;
propChangeSupport.firePropertyChange(ANNEALING, oldValue, annealedValue);
}
}
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