我试图使用SwingWorker更新我的gui。
我想要更新的gui部分是带有GridLayout [50] [50]的JPanel（gridPanel）。
GridLayout中的每个网格都有一个自定义的GridGraphic JComponent。
在我的SwingWorker的doInBackground（）中，我更新了代表某种颜色的每个GridGraphic。然后，我将它发布到进程（）用来更新gui的List。虽然，gui没有更新。
有没有办法在不调用repaint（）的情况下执行此操作。
如何修复我的SwingWorker以便gui响应。我想为gridPanel返回什么，gridPanel是响应变化的[50] [50] GridLayout GridGraphic组件
SwingWorker在stepButton.addActionListener中执行（新的ActionListener（）............... in SlimeGui
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
public class SlimeGui extends JFrame{
private JPanel buttonPanel, populationPanel, velocityPanel;
private JPanel gridPanel = new JPanel(new GridLayout(50, 50));
private JButton setupButton, stepButton, goButton;
private JLabel populationNameLabel, velocityNameLabel, populationSliderValueLabel, velocitySliderValueLabel;
private JSlider populationSlider, velocitySlider;
private GridGraphic [] [] gridGraphic;
private GridGraphic test;
private int agents = 125;
private int velocity = 500;
private boolean resetGrid;
public SlimeGui() {
setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
//Set up JButtons
buttonPanel = new JPanel();
setupButton = new JButton("Setup");
stepButton = new JButton("Step");
goButton = new JButton("Go");
buttonPanel.add(setupButton);
buttonPanel.add(stepButton);
buttonPanel.add(goButton);
c.gridx = 0;
c.gridy = 1;
c.gridwidth = 3;
add(buttonPanel, c);
//Set up population JSlider
populationPanel = new JPanel();
populationNameLabel = new JLabel(" Population");
populationSliderValueLabel = new JLabel(Integer.toString(agents));
populationSlider = new JSlider(JSlider.HORIZONTAL,0, 1000, 125);
populationSlider.setMajorTickSpacing(125);
populationSlider.setPaintTicks(true);
populationSlider.addChangeListener(new PopulationSliderListener());
populationPanel.add(populationNameLabel);
populationPanel.add(populationSlider);
populationPanel.add(populationSliderValueLabel);
c.gridx = 0;
c.gridy = 2;
add(populationPanel, c);
//Set up veolicty JSlider
velocityPanel = new JPanel();
velocityNameLabel = new JLabel(" Velocity");
velocitySliderValueLabel = new JLabel(Integer.toString(velocity));
velocitySlider = new JSlider(JSlider.HORIZONTAL,0, 1000, 500);
velocitySlider.setMajorTickSpacing(125);
velocitySlider.setPaintTicks(true);
velocitySlider.addChangeListener(new VelocitySliderListener());
velocityPanel.add(velocityNameLabel);
velocityPanel.add(velocitySlider);
velocityPanel.add(velocitySliderValueLabel);
c.gridx = 0;
c.gridy = 3;
add(velocityPanel, c);
//Set up grid with GridGraphic objects
gridGraphic = new GridGraphic[50][50];
for(int i = 0; i < 50; i++){
for(int j = 0; j < 50; j++){
gridGraphic[i][j] = new GridGraphic();
gridPanel.add(gridGraphic[i][j]);
}
}
c.gridx = 0;
c.gridy = 0;
c.gridwidth = 3;
add(gridPanel, c);
//Set up ActionListener for the 'Setup' JButton
setupButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
int n1=0;
int n2=0;
//resets the grid so there are no agents
if(resetGrid){
for(int i = 0; i < 50; i++){
for(int j = 0; j < 50; j++){
gridGraphic[i][j].setDefault();
}
}
}
//sets a random number of positions for GridGraphics
for (int numOfAgenets = 0; numOfAgenets < agents; numOfAgenets++){
int lowerB = 0;
int upperB = 50;
n1 = (lowerB + (int)(Math.random()*(upperB-lowerB))); //random number 1
n2 = (lowerB + (int)(Math.random()*(upperB-lowerB))); //random number 2
System.out.println("Choosing random agent "+(numOfAgenets+1)+": "+n1 +" "+n2);
//sets the GridGraphic to an agent if it's available
if (gridGraphic[n1][n2].getIntensity() == 0)
gridGraphic[n1][n2].setAgent();
//if the GridGraphic is already an agent, it continues to search
else if(gridGraphic[n1][n2].getIntensity() == 5){
while(gridGraphic[n1][n2].getIntensity() == 5){
n1 = (lowerB + (int)(Math.random()*(upperB-lowerB)));
n2 = (lowerB + (int)(Math.random()*(upperB-lowerB)));
}
gridGraphic[n1][n2].setAgent();
}
}
repaint();
resetGrid = true;
}
});
//Set up ActionListener for the 'Step' JButton
stepButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
StepManager step = new StepManager(SlimeGui.this);
step.execute();
//repaint();
}
});
}
class PopulationSliderListener implements ChangeListener{
public void stateChanged(ChangeEvent e){
agents = ((JSlider)e.getSource()).getValue();
populationSliderValueLabel.setText(Integer.toString(agents));
System.out.println("Population of agents: " + agents);
}
}
class VelocitySliderListener implements ChangeListener{
public void stateChanged(ChangeEvent e){
velocity = ((JSlider)e.getSource()).getValue();
velocitySliderValueLabel.setText(Integer.toString(velocity));
System.out.println("Velocity(ms) of agents: " + velocity);
}
}
public Integer getVelocity(){
return velocity;
}
public GridGraphic getGridGraphic(int n1, int n2){
return gridGraphic[n1][n2];
}
public GridGraphic [][] getGridGraphic(){
return gridGraphic;
}
public void setGridGraphicArray(GridGraphic xxx, int n1, int n2 ){
gridGraphic[n1][n2] = xxx;
}
public void setGridPanel(GridGraphic[][] xxx){
for(int i = 0; i < 50; i++){
for(int j = 0; j < 50; j++){
gridPanel.add(xxx[i][j]);
}
}
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Create and set up the window.
SlimeGui slime = new SlimeGui();
slime.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Display the window.
slime.pack();
slime.setVisible(true);
slime.setResizable(false);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
我的SwingWorker
import java.util.List;
import java.awt.*;
import javax.swing.*;
import java.util.concurrent.ExecutionException;
public class StepManager extends SwingWorker<Void, GridGraphic>{
private SlimeGui gui;
public StepManager(SlimeGui sg){
gui=sg;
}
@Override
protected Void doInBackground() throws Exception{
for(int i = 0; i < 50; i++){
for(int j = 0; j < 50; j++){
if(gui.getGridGraphic(i,j).getIntensity()==5){
if (i==0){
gui.getGridGraphic(i,j).setDefault();
gui.getGridGraphic(49,j).setAgent();
}
else{
gui.getGridGraphic(i,j).setDefault();
gui.getGridGraphic(i-1,j).setAgent();
}
}
publish(gui.getGridGraphic(i,j));
}
}
return null;
}
@Override
protected void process(List <GridGraphic> gg){
int k=0;
for ( int i = 0; i < 50; i++ ){
for(int j = 0; j < 50; j++){
gui.setGridGraphicArray(gg.get(k),i,j);
k++;
}
}
gui.setGridPanel(gui.getGridGraphicArray());
System.out.println("process has completed");
}
@Override
protected void done(){
System.out.println("doInBackground has completed");
}
}
My GridGraphic
import java.awt.*;
import javax.swing.*;
public class GridGraphic extends JComponent {
private int intensity = 0;
public GridGraphic() {
//setBorder(BorderFactory.createLineBorder(Color.BLUE));
}
public void paintComponent(Graphics g) {
//paints the GridGraphic black
if (intensity == 0){
super.paintComponent(g);
g.setColor(Color.BLACK);
g.fillRect(0, 0, getWidth(), getHeight());
}
//paints the GridGraphic black with a yellow dot
else if (intensity == 5){
super.paintComponent(g);
g.setColor(Color.BLACK);
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(Color.YELLOW);
g.fillOval(3, 3, getWidth()/2, getHeight()/2);
}
//paints the GridGraphic dark yellow (pheromone)
if (intensity == 2){
super.paintComponent(g);
g.setColor(Color.BLACK.brighter());
g.fillRect(0, 0, getWidth(), getHeight());
}
}
public Dimension getPreferredSize() {
return new Dimension(10, 10);
}
public void setAgent(){
intensity = 5;
}
public void setPheromone1(){
intensity = 2;
}
public void setDefault(){
intensity = 0;
}
public int getIntensity(){
return intensity;
}
}
答案 0 :(得分：3)
堆栈跟踪中的行号表示发生异常的位置。 gui中的StepManager属性为空。它从未被初始化。