java - JScrollPane 内容在滚动时不刷新

Question

我正在创建一个简单的 GUI 选项，其中包含 JScrollPanel。

问题是当我滚动 JScrollPanel 内 JPanel 的所有内容时，它不会像这样刷新: Bad Refresh Scrolling

另一个问题是，并非所有文本字段都绘制得很好，并且组合框字段位于第一个文本字段后面。

这是我的代码:

• OptionsPanel.java 问题的根源

  package scroll;
  
  import java.awt.GridBagConstraints;
  import java.awt.GridBagLayout;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import java.awt.event.TextEvent;
  import java.awt.event.TextListener;
  
  import javax.swing.JPanel;
  import javax.swing.JScrollPane;
  
  import scroll.NavigationButtons.Navigation;
  
  public class OptionsPanel extends JPanel implements ActionListener, TextListener {
  
      private static final long serialVersionUID = 3800714599366218432L;
  
      private NavigationButtons navBtn;
  
      private ChangeOptionCB language;
  
      private ChangeOptionTF option1;
  
      private ChangeOptionTF option2;
  
      private ChangeOptionTF option3;
  
      private ChangeOptionTF option4;
  
      private ChangeOptionTF option5;
  
      private ChangeOptionTF option6;
  
      private ChangeOptionTF option7;
  
      private JScrollPane scrollPane;
  
      public OptionsPanel() {
          super();
  
          GridBagLayout layout = new GridBagLayout();
          setLayout(layout);
  
          GridBagConstraints constraint = new GridBagConstraints();
  
          JPanel optionsPanel = new JPanel();
          GridBagLayout l = new GridBagLayout();
          GridBagConstraints c = new GridBagConstraints();
  
          optionsPanel.setLayout(l);
  
  
  
          String[] langues = {"en", "fr", "es"};
          language = new ChangeOptionCB("Languages", langues);
          language.addTextListener(this);
          c.gridx = 0;
          c.gridy = 0;
          c.fill = GridBagConstraints.HORIZONTAL;
          c.anchor = GridBagConstraints.PAGE_START;
          c.weightx = 1;
          c.weighty = 0.1;
          optionsPanel.add(language, c);
  
          option1 = new ChangeOptionTF("option 1");
          option1.addTextListener(this);
          option1.setText("option 1");
          c.gridx = 0;
          c.gridy = 1;
          c.fill = GridBagConstraints.HORIZONTAL;
          c.anchor = GridBagConstraints.PAGE_START;
          c.weightx = 1;
          c.weighty = 0.1;
          optionsPanel.add(option1, c);
  
          option2 = new ChangeOptionTF("option 2");
          option2.addTextListener(this);
          option2.setText("option 2");
          c.gridx = 0;
          c.gridy = 2;
          c.fill = GridBagConstraints.HORIZONTAL;
          c.anchor = GridBagConstraints.PAGE_START;
          c.weightx = 1;
          c.weighty = 0.1;
          optionsPanel.add(option2, c);
  
          option3 = new ChangeOptionTF("option 3");
          option3.addTextListener(this);
          option3.setText("option 3");
          c.gridx = 0;
          c.gridy = 3;
          c.fill = GridBagConstraints.HORIZONTAL;
          c.anchor = GridBagConstraints.PAGE_START;
          c.weightx = 1;
          c.weighty = 0.1;
          optionsPanel.add(option3, c);
  
          option4 = new ChangeOptionTF("option 4");
          option4.addTextListener(this);
          option4.setText("option 4");
          c.gridx = 0;
          c.gridy = 4;
          c.fill = GridBagConstraints.HORIZONTAL;
          c.anchor = GridBagConstraints.PAGE_START;
          c.weightx = 1;
          c.weighty = 0.1;
          optionsPanel.add(option4, c);
  
          option5 = new ChangeOptionTF("option 5");
          option5.addTextListener(this);
          option5.setText("option 5");
          c.gridx = 0;
          c.gridy = 5;
          c.fill = GridBagConstraints.HORIZONTAL;
          c.anchor = GridBagConstraints.PAGE_START;
          c.weightx = 1;
          c.weighty = 0.1;
          optionsPanel.add(option5, c);
  
          option6 = new ChangeOptionTF("option 6");
          option6.addTextListener(this);
          option6.setText("option 6");
          c.gridx = 0;
          c.gridy = 6;
          c.fill = GridBagConstraints.HORIZONTAL;
          c.anchor = GridBagConstraints.PAGE_START;
          c.weightx = 1;
          c.weighty = 0.1;
          optionsPanel.add(option6, c);
  
          option7 = new ChangeOptionTF("option 7");
          option7.addTextListener(this);
          option7.setText("option 7");
          c.gridx = 0;
          c.gridy = 7;
          c.fill = GridBagConstraints.HORIZONTAL;
          c.anchor = GridBagConstraints.PAGE_START;
          c.weightx = 1;
          c.weighty = 0.1;
          optionsPanel.add(option7, c);
  
          scrollPane = new JScrollPane(optionsPanel);
  
          constraint.gridx = 0;
          constraint.gridy = 0;
          constraint.fill = GridBagConstraints.BOTH;
          constraint.weightx = 1;
          constraint.weighty = 1;
          add(scrollPane, constraint);
  
          navBtn = new NavigationButtons(NavigationButtons.EXIT);
          navBtn.addActionListener(this);
          constraint.gridx = 0;
          constraint.gridy = 1;
          constraint.fill = GridBagConstraints.HORIZONTAL;
          constraint.weightx = 1;
          constraint.weighty = 0.25;
          add(navBtn, constraint);
  
      }
  
      @Override
      public void actionPerformed(ActionEvent ae) {
          if (navBtn == ae.getSource()) {
              int id = ae.getID();
              if (Navigation.EXIT.getId() == id) {
                  System.out.println("Get out !!");
              } 
          }
      }
  
      @Override
      public void textValueChanged(TextEvent te) {
          if (language == te.getSource()) {
              System.out.println("The option as changed : "+language.getOption());
          }
          if (option1 == te.getSource()) {
              System.out.println("The option as changed : "+option1.getNewText());
          }
          if (option2 == te.getSource()) {
              System.out.println("The option as changed : "+option2.getNewText());
          }
          if (option3 == te.getSource()) {
              System.out.println("The option as changed : "+option3.getNewText());
          }
          if (option4 == te.getSource()) {
              System.out.println("The option as changed : "+option4.getNewText());
          }
          if (option5 == te.getSource()) {
              System.out.println("The option as changed : "+option5.getNewText());
          }
          if (option6 == te.getSource()) {
              System.out.println("The option as changed : "+option6.getNewText());
          }
          if (option7 == te.getSource()) {
              System.out.println("The option as changed : "+option7.getNewText());
          }
          scrollPane.revalidate();
          scrollPane.repaint();
      }
  
  }
  

• 主类

  package scroll;
  
  import java.awt.Dimension;
  import javax.swing.JFrame;
  
  public class ScrollTest {
  
      public static void main(String[] args) {
  
          JFrame frame = new JFrame();
  
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.setResizable(false);
          frame.setContentPane(new OptionsPanel());
          frame.setTitle("Scrool Test");
          frame.pack();
  
          Dimension dimension = new Dimension(691, 263);
          frame.setSize(dimension);
          frame.setPreferredSize(dimension);
          frame.setLocationRelativeTo(null);
  
          frame.pack();
          frame.setVisible(true);
      }
  }
  

• 您需要的不同东西:

  package scroll;
  
  import java.awt.GridBagConstraints;
  import java.awt.GridBagLayout;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import java.awt.event.TextEvent;
  import java.awt.event.TextListener;
  
  import javax.swing.JButton;
  import javax.swing.JComboBox;
  import javax.swing.JLabel;
  import javax.swing.JPanel;
  import javax.swing.SwingConstants;
  import javax.swing.event.EventListenerList;
  
  public class ChangeOptionCB extends JPanel implements ActionListener {
  
      private static final long serialVersionUID = 3355314012553851743L;
      private JComboBox cb;
      private JButton saveBtn;
  
      private EventListenerList listeners;
  
      public ChangeOptionCB(String label, String[] list) {
  
          listeners = new EventListenerList();
  
          GridBagLayout layout = new GridBagLayout();
          GridBagConstraints c = new GridBagConstraints();
          setLayout(layout);
  
          JLabel jLabel = new JLabel(label);
          jLabel.setHorizontalAlignment(SwingConstants.LEFT);
          c.fill = GridBagConstraints.LINE_START;
          c.gridx = 0;
          c.gridy = 0;
          c.weightx = 0.1;
          add(jLabel, c);
  
          cb = new JComboBox(list);
          c.fill = GridBagConstraints.HORIZONTAL;
          c.gridx = 1;
          c.gridy = 0;
          c.weightx = 0.8;
          add(cb, c);
  
  
          saveBtn = new JButton("Save");
          saveBtn.addActionListener(this);
  
          c.gridx = 2;
          c.gridy = 0;
          c.weightx = 0;
          c.anchor = GridBagConstraints.LINE_END;
          add(saveBtn, c);
  
      }
  
      @Override
      public void actionPerformed(ActionEvent ae) {
          if (ae.getSource() == saveBtn) {
              fireTextAsChange();
          }
      }
  
      public String getOption() {
          return (String) cb.getSelectedItem();
      }
  
      public void addTextListener(TextListener listener) {
          listeners.add(TextListener.class, listener);
      }
  
      public void removeActionListener(TextListener listener) {
          listeners.remove(TextListener.class, listener);
      }
  
      private void fireTextAsChange(){
          TextListener[] listenerList = (TextListener[])listeners.getListeners(TextListener.class);
  
          for(TextListener listener : listenerList){
              listener.textValueChanged(new TextEvent(this, 0));
          }
      }
  
  }
  
  package scroll;
  
  import java.awt.GridBagConstraints;
  import java.awt.GridBagLayout;
  import java.awt.TextField;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import java.awt.event.TextEvent;
  import java.awt.event.TextListener;
  
  import javax.swing.JButton;
  import javax.swing.JLabel;
  import javax.swing.JPanel;
  import javax.swing.event.EventListenerList;
  
  public class ChangeOptionTF extends JPanel implements ActionListener {
  
      private static final long serialVersionUID = 3355314012553851743L;
      private TextField tf;
      private JButton saveBtn;
  
      private EventListenerList listeners;
  
      public ChangeOptionTF(String label) {
  
          listeners = new EventListenerList();
  
          GridBagLayout layout = new GridBagLayout();
          GridBagConstraints c = new GridBagConstraints();
          setLayout(layout);
  
          JLabel jLabel = new JLabel(label);
          c.fill = GridBagConstraints.BOTH;
          c.gridx = 0;
          c.gridy = 0;
          c.weightx = 1;
          add(jLabel, c);
  
          tf = new TextField();
          c.fill = GridBagConstraints.HORIZONTAL;
          c.gridx = 0;
          c.gridy = 1;
          c.weightx = 0.5;
          add(tf, c);
  
  
          saveBtn = new JButton("Save");
          saveBtn.addActionListener(this);
  
          c.gridx = 2;
          c.gridy = 1;
          c.weightx = 0;
          c.anchor = GridBagConstraints.LINE_END;
          add(saveBtn, c);
  
      }
  
      @Override
      public void actionPerformed(ActionEvent ae) {
          if (ae.getSource() == saveBtn) {
              fireTextAsChange();
          }
      }
  
      public String getNewText() {
          return tf.getText();
      }
  
      public void addTextListener(TextListener listener) {
          listeners.add(TextListener.class, listener);
      }
  
      public void removeActionListener(TextListener listener) {
          listeners.remove(TextListener.class, listener);
      }
  
      private void fireTextAsChange(){
          TextListener[] listenerList = (TextListener[])listeners.getListeners(TextListener.class);
  
          for(TextListener listener : listenerList){
              listener.textValueChanged(new TextEvent(this, 0));
          }
      }
  
      public void setText(String text) {
          tf.setText(text);
      }
  
  }
  
  package scroll;
  
  import java.awt.GridBagConstraints;
  import java.awt.GridBagLayout;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  
  import javax.swing.JButton;
  import javax.swing.JPanel;
  import javax.swing.event.EventListenerList;
  
  public class NavigationButtons extends JPanel implements ActionListener {
  
      private static final long serialVersionUID = -4844499317626526067L;
  
      public enum Navigation {
          NEXT(1), CANCEL(0), EXIT(-1);
  
          private int id;
  
          private Navigation(int id) {
              this.id = id;
          }
  
          public int getId() {
              return id;
          }
      }
  
      public static int NEXT_CANCEL = 0;
      public static int CANCEL = 1;
      public static int EXIT = 2;
  
      private JButton cancel;
      private JButton next;
      private JButton exit;
  
      private EventListenerList listeners;
  
      public NavigationButtons(int type) {
  
          listeners = new EventListenerList();
  
          GridBagLayout layout = new GridBagLayout();
          GridBagConstraints c = new GridBagConstraints();
          setLayout(layout);
  
          if ((NEXT_CANCEL == type) || (CANCEL == type)) {
              cancel = new JButton("Cancel");
              cancel.addActionListener(this);
  
              c.gridwidth = 1;
              c.anchor = GridBagConstraints.LINE_START;
              c.weightx = 1;
              add(cancel, c);
          }
  
          if (NEXT_CANCEL == type) {
              next = new JButton("Next");
              next.addActionListener(this);
  
              c.gridwidth = 1;
              c.anchor = GridBagConstraints.LINE_END;
              c.weightx = 0;
              add(next, c);
          }
  
          if (EXIT == type) {
              exit = new JButton("Exit");
              exit.addActionListener(this);
  
              c.gridwidth = 1;
              c.anchor = GridBagConstraints.LINE_END;
              c.weightx = 1;
              add(exit, c);
          }
  
      }
  
      public void setNextEnable(boolean b) {
          next.setEnabled(b);
      }
  
      @Override
      public void actionPerformed(ActionEvent ae) {
          if (ae.getSource() == next) {
              fireActionPerformed(Navigation.NEXT);
          }
          if (ae.getSource() == cancel) {
              fireActionPerformed(Navigation.CANCEL);
          }
          if (ae.getSource() == exit) {
              fireActionPerformed(Navigation.EXIT);
          }
      }
  
      public void addActionListener(ActionListener listener) {
          listeners.add(ActionListener.class, listener);
      }
  
      public void removeActionListener(ActionListener listener) {
          listeners.remove(ActionListener.class, listener);
      }
  
      public void fireActionPerformed(Navigation nav){
          ActionListener[] listenerList = (ActionListener[])listeners.getListeners(ActionListener.class);
  
          for(ActionListener listener : listenerList){
              listener.actionPerformed(new ActionEvent(this, nav.getId(), null));
          }
      }
  }
  

我的代码中有什么问题导致了这种丑陋的刷新？我不明白。

也许我需要实现一种监听器，在每次滚动时重新绘制框架？

更奇怪的是，如果我替换

add(scrollPane, constraint);

由

add(optionsPane, constraint);

内容传播得很好(至少在这个例子中)。

谢谢你

朱利安

Answer 1

基本问题是，您使用的是java.awt.TextField，它是轻量级容器内的重量级组件。这只是自找麻烦，他们往往不能很好地配合。

相反，使用javax.swing.JTextField

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.TextEvent;
import java.awt.event.TextListener;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.event.EventListenerList;

public class ChangeOptionTF extends JPanel implements ActionListener {

    private static final long serialVersionUID = 3355314012553851743L;
    private JTextField tf;
    private JButton saveBtn;

    private EventListenerList listeners;

    public ChangeOptionTF(String label) {

        listeners = new EventListenerList();

        GridBagLayout layout = new GridBagLayout();
        GridBagConstraints c = new GridBagConstraints();
        setLayout(layout);

        JLabel jLabel = new JLabel(label);
        c.fill = GridBagConstraints.BOTH;
        c.gridx = 0;
        c.gridy = 0;
        c.weightx = 1;
        add(jLabel, c);

        tf = new JTextField();