如何在java中的每個jList項目中添加Jpanel

Question

我想動態地在java中的每個jlist項目中添加jPanel。其中jPanel包含一個按鈕和進度條和標籤。並且jlist在jlist中的每個元組中包含jpanel。

Answer 1

JList不能保存組件，而只能保存組件的效果圖。所以簡而言之，你的請求不是直接可能的。 但是，你可以用一個JTable來保存JButton和JProgressBar和JLabel的可編輯渲染。與JTable最大的區別在於它的單元格是可編輯的，所以這個按鈕可以在這個環境中「工作」。

您可以通過查看鏈接到鞦韆教程和其他Swing資源在這裏找到更多：Swing Info

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示例代碼：

• 注意，這裏使用羅布Camicker的令人驚訝的精彩ButtonColumn。文章可以找到here，代碼可以找到here。
• 這也從mKorbel的StackOverflow的答案代碼here
• 除了TrashGod的代碼借用發現here

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import java.awt.BorderLayout; 
import java.awt.Color; 
import java.awt.Component; 
import java.awt.event.*; 
import java.beans.PropertyChangeEvent; 
import java.beans.PropertyChangeListener; 
import java.util.ArrayList; 
import java.util.List; 
import java.util.Random; 

import javax.swing.*; 
import javax.swing.border.Border; 
import javax.swing.border.LineBorder; 
import javax.swing.event.SwingPropertyChangeSupport; 
import javax.swing.table.AbstractTableModel; 
import javax.swing.table.DefaultTableCellRenderer; 
import javax.swing.table.TableCellEditor; 
import javax.swing.table.TableCellRenderer; 
import javax.swing.table.TableColumnModel; 

@SuppressWarnings("serial") 
public class ComplexTableEg extends JPanel { 
    private CTTableModel tableModel = new CTTableModel(); 
    private JTable table = new JTable(tableModel); 

    public ComplexTableEg() { 
     StartProgressAction startProgressAction = new StartProgressAction(
      "Start Progress", KeyEvent.VK_S); 
     new ButtonColumn(table, startProgressAction, 0); 
     table.getColumnModel().getColumn(2).setCellRenderer(new ProgressRenderer()); 

     JPanel buttonPanel = new JPanel(); 
     buttonPanel.add(new JButton(new AddRowAction("Add Row", KeyEvent.VK_A))); 

     setLayout(new BorderLayout()); 
     add(new JScrollPane(table), BorderLayout.CENTER); 
     add(buttonPanel, BorderLayout.PAGE_END); 
    } 

    private class AddRowAction extends AbstractAction { 
     public AddRowAction(String name, int mnemonic) { 
     super(name); 
     putValue(MNEMONIC_KEY, mnemonic); 
     } 

     @Override 
     public void actionPerformed(ActionEvent e) { 
     int rowCount = tableModel.getRowCount() + 1; 
     CTRowData ctRow = new CTRowData("Row " + rowCount); 
     tableModel.addRow(ctRow); 
     } 
    } 

    private static void createAndShowGui() { 
     ComplexTableEg mainPanel = new ComplexTableEg(); 

     JFrame frame = new JFrame("Complex Table Eg"); 
     frame.setDefaultCloseOperation(JFrame.DISPOSE_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(); 
     } 
     }); 
    } 
} 

/** 
* From mKorbel's StackOverflow answer 
* @link: https://stackoverflow.com/a/7036206/522444 
* 
*/ 
class ProgressRenderer extends DefaultTableCellRenderer { 
    private final JProgressBar b = new JProgressBar(0, 100); 

    public ProgressRenderer() { 
     super(); 
     setOpaque(true); 
     b.setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1)); 
    } 

    @Override 
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { 
     Integer i = (Integer) value; 
     String text = "Completed"; 
     if (i < 0) { 
      text = "Error"; 
     } else if (i < 100) { 
      b.setValue(i); 
      return b; 
     } 
     super.getTableCellRendererComponent(table, text, isSelected, hasFocus, row, column); 
     return this; 
    } 
} 

@SuppressWarnings("serial") 
class StartProgressAction extends AbstractAction { 
    public StartProgressAction(String name, int mnemonic) { 
     super(name); 
     putValue(MNEMONIC_KEY, mnemonic); 
    } 

    @Override 
    public void actionPerformed(ActionEvent e) { 
     JTable table = (JTable) e.getSource(); 
     int rowIndex = Integer.parseInt(e.getActionCommand()); 
     CTTableModel model = (CTTableModel) table.getModel(); 
     CTRowData row = model.getRow(rowIndex); 
     row.startProcessing(); 
    } 
} 

@SuppressWarnings("serial") 
class CTTableModel extends AbstractTableModel { 
    public static final String[] COLUMN_HEADERS = { "Button", "Label", 
     "Progress" }; 
    private List<CTRowData> dataList = new ArrayList<>(); 

    @Override 
    public int getRowCount() { 
     return dataList.size(); 
    } 

    public CTRowData getRow(int rowIndex) { 
     return dataList.get(rowIndex); 
    } 

    @Override 
    public int getColumnCount() { 
     return COLUMN_HEADERS.length; 
    } 

    @Override 
    public Object getValueAt(int rowIndex, int columnIndex) { 
     CTRowData row = dataList.get(rowIndex); 
     switch (columnIndex) { 
     case 0: 
     return CTRowData.START_PROCESSING; 
     case 1: 
     return row.getText(); 
     case 2: 
     return row.getValue(); 
     } 
     return null; 
    } 

    @Override 
    public Class<?> getColumnClass(int columnIndex) { 
     switch (columnIndex) { 
     case 0: 
     return String.class; 
     case 1: 
     return String.class; 
     case 2: 
     return Integer.class; 
     } 
     // should never need this default 
     return super.getColumnClass(columnIndex); 
    } 

    @Override 
    public String getColumnName(int column) { 
     return COLUMN_HEADERS[column]; 
    } 

    public void addRow(CTRowData row) { 
     dataList.add(row); 
     int firstRow = dataList.size() - 1; 
     fireTableRowsInserted(firstRow, firstRow); 

     row.addPropertyChangeListener(new RowDataListener(firstRow)); 
    } 

    private class RowDataListener implements PropertyChangeListener { 
     private int row; 

     public RowDataListener(int row) { 
     this.row = row; 
     } 

     @Override 
     public void propertyChange(PropertyChangeEvent evt) { 
     if (CTRowData.VALUE.equals(evt.getPropertyName())) { 
      fireTableCellUpdated(row, 2); 
     } 
     } 
    } 

    @Override 
    public boolean isCellEditable(int rowIndex, int columnIndex) { 
     boolean cellEditable = false; 
     if (columnIndex != 0) { 
     cellEditable = false; 
     } else { 
     cellEditable = true; 
     } 
     return cellEditable; 
    } 
} 

class CTRowData { 
    public static final String VALUE = "value"; 
    public static final String PROCESSING = "processing"; 
    public static final String START_PROCESSING = "Start Processing"; 
    private static final int TIMER_DELAY = 500; 
    public static final int MAX_VALUE = 100; 
    private String text; 
    private boolean processing = false; 
    private int value = 0; 
    private Random random = new Random(); 
    private SwingPropertyChangeSupport pcSupport = new SwingPropertyChangeSupport(
     this); 

    public CTRowData(String text) { 
     this.text = text; 
    } 

    public boolean isProcessing() { 
     return processing; 
    } 

    public void setProcessing(boolean processing) { 
     boolean oldValue = this.processing; 
     boolean newValue = processing; 
     this.processing = processing; 
     pcSupport.firePropertyChange(PROCESSING, oldValue, newValue); 
    } 

    public void startProcessing() { 
     if (processing) { 
     return; 
     } 
     setProcessing(true); 
     setValue(0); 
     new Timer(TIMER_DELAY, new TimerListener()).start(); 
    } 

    public String getText() { 
     return text; 
    } 

    public int getValue() { 
     return value; 
    } 

    public void setValue(int value) { 
     int oldValue = this.value; 
     int newValue = value; 
     this.value = value; 
     pcSupport.firePropertyChange(VALUE, oldValue, newValue); 
    } 

    public void addPropertyChangeListener(PropertyChangeListener listener) { 
     pcSupport.addPropertyChangeListener(listener); 
    } 

    public void removePropertyChangeListener(PropertyChangeListener listener) { 
     pcSupport.removePropertyChangeListener(listener); 
    } 

    private class TimerListener implements ActionListener { 
     @Override 
     public void actionPerformed(ActionEvent e) { 
     int temp = value; 
     temp += 5 + random.nextInt(10); 
     temp = Math.min(temp, MAX_VALUE); 
     setValue(temp); 
     if (temp >= MAX_VALUE) { 
      ((Timer) e.getSource()).stop(); 
      setProcessing(false); 
     } 
     } 
    } 
}