JTable中色细胞永久当我点击按钮

Question

我想创建一个JTable和（在着色细胞漂亮Excel等）永久上色它的细胞通过一个按钮的点击。到目前为止，每一个细胞我选择，它会在ArrayList<Cell> 。

首先，我要对列表中的每一个细胞，当我点击按钮（这是从代码的区别，我发现）被永久着色。我必须使用像这样的statememnt table.getColumnModel().getColumn(column).setCellRenderer(this);？

这是一个编译代码，如果你调试它，你会看到，当点击按钮时，我无法访问getTableCellRendererComponent（）方法。为什么会发生？如果你能告诉我你的意见，我将不胜感激。

（注：这是一个巨大的程序的复制，所以这是一个有点大混乱和硬编码在一些地方不能让它为我想解决小）。

类ColorSelectedTableCells.java

public class ColorSelectedTableCells extends JPanel { 
    private JButton btn = new JButton("color cells"); 
    private MyCellRenderer myCellRenderer = new MyCellRenderer(); 
    public static final Object[][] DATA = new Object[3][3]; 
    public static final String[] COLS = {"A", "B", "C"}; 
    private static final int PREF_WIDTH = 400; 
    private static final int PREF_HEIGHT = 300; 
    private static CellSelectionSet cellSelectionSet = new CellSelectionSet(); 

    private JTable table = new JTable(DATA,COLS){ 
     @Override 
     public boolean isCellEditable(int row, int column) {return false;} 

     @Override 
     public boolean isCellSelected(int row, int column) { 
      if (cellSelectionSet.containsOneOrLess()) { 
      return super.isCellSelected(row, column); 
      } 
      return cellSelectionSet.contains(row, column); 
     } 

     @Override 
     public void changeSelection(int rowIndex, int columnIndex, boolean toggle, boolean extend) { 
      super.changeSelection(rowIndex, columnIndex, toggle, extend); 
      if (toggle) { 
      cellSelectionSet.add(rowIndex, columnIndex); 
      } 
      else { 
      if (extend) { 
       cellSelectionSet.add(rowIndex, columnIndex); 
      } 
      else { 
       cellSelectionSet.clear(); 
       cellSelectionSet.add(rowIndex, columnIndex); 
      } 
      } 
     } 
     }; 

public ColorSelectedTableCells() { 
    table.setDefaultRenderer(Integer.class, myCellRenderer); 
    table.setCellSelectionEnabled(true); 
    table.setColumnSelectionAllowed(false); 
    table.setRowSelectionAllowed(false); 

    JScrollPane scrollPane = new JScrollPane(table, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED); 
    JPanel btnPanel = new JPanel(); 
    btnPanel.add(btn); 

    setLayout(new BorderLayout()); 
    add(scrollPane, BorderLayout.CENTER); 
    add(btnPanel, BorderLayout.SOUTH); 

    btn.addActionListener(new ActionListener() { 
    @Override 
    public void actionPerformed(ActionEvent e) { 
     myCellRenderer.setShowSelected(true); 
     table.repaint(); 
    } 
    }); 
} 

@Override 
public Dimension getPreferredSize() { 
    return new Dimension(PREF_WIDTH, PREF_HEIGHT); 
} 

private static void createAndShowUI() { 
    JFrame frame = new JFrame(); 
    frame.getContentPane().add(new ColorSelectedTableCells()); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    frame.pack(); 
    frame.setLocationRelativeTo(null); 
    frame.setVisible(true); 
} 

public static void main(String[] args) { 
    java.awt.EventQueue.invokeLater(new Runnable() { 
    public void run() { 
     createAndShowUI(); 
    } 
    }); 
} 

类MyCellRenderer.java

private static class MyCellRenderer extends DefaultTableCellRenderer { 
    private boolean showSelected = false; 
    private byte colorSwitcher; 

    public void setShowSelected(boolean showSelected) { 
    this.showSelected = showSelected; 
    } 

    public void setColorSwitcher(byte colorSwitcher){ 
     this.colorSwitcher = colorSwitcher; 
    } 

    @Override 
    public Component getTableCellRendererComponent(JTable table,Object value, boolean isSelected, boolean hasFocus, int row,int column) { 
    Component superComponent = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); 

     if(showSelected && table.isCellSelected(row, column)){ 
     superComponent.setBackground(Color.GREEN); 
     } 
     else if (table.isCellSelected(row, column)){ 
     superComponent.setBackground(table.getSelectionBackground()); 
     } 
     else { 
     superComponent.setBackground(table.getBackground()); 
     } 
     return superComponent; 
    } 
    } 
} 

类cellSelectionSet.java

public class CellSelectionSet { 
    private List<Cell> cells = new ArrayList<>(); 

    public void add(int r, int c) { 
    if (!contains(r, c)) { 
     cells.add(new Cell(r, c)); 
    } 
    } 

    public boolean containsOneOrLess() { 
    return cells.size() <= 1; 
    } 

    public boolean contains(int r, int c) { 
    for (Cell cell : cells) { 
     if (cell.is(r, c)) { 
      return true; 
     } 
    } 
    return false; 
    } 

    public Cell getElementAt(int i){ 
    return cells.get(i); 
    } 

    public int getSize(){ 
    return this.cells.size(); 
    } 

    public void clear() { 
    cells.clear(); 
    System.out.println("CellSelectionSet cleared."); 
    } 
} 

类Cell.java

public class Cell { 
    private int row, column; 

    public Cell(int row, int column){ 
    this.row = row; 
    this.column = column; 
    } 

    public boolean is(int r, int c) { 
    return row == r && column == c; 
    } 
} 

Answer 1

主要问题：

table.setDefaultRenderer(Integer.class, myCellRenderer); 

应该

table.setDefaultRenderer(Object.class, myCellRenderer); 

这将让你的细胞改变颜色。但你有一个地方后按下按钮，您选择的每个单元格设置为true，自动改变颜色，因为showSelected财产的问题。谁知道，也许这就是你想要的。

也是另一个问题是与细胞停留在选择的颜色。如果您的支票陈述存在问题

if(showSelected && table.isCellSelected(row, column)){ 

一旦您做出更多选择，原始选择将被清除。一个解决办法是检查CellSelectionSet以查看它是否包含该单元格，还要检查它是否是新选定的。像

if (cellSelectionSet.contains(row, column) 
        && !cellSelectionSet.getCellAt(row, column).isNewlySelected()) 

东西，我在Cell类添加一个方法getCellAt您CellSelectionSet

public Cell getCellAt(int row, int column) { 
    Cell c = null; 
    for (Cell cell : cells) { 
     if (cell.is(row, column)) { 
      c = cell; 
     } 
    } 
    return c; 
} 

，也是一个标志，检查是否是newlySelected。

class Cell { 

    private boolean newlySelected = true; 

    public boolean isNewlySelected() { 
     return newlySelected; 
    } 

    public void setNewlySelected(boolean newlySelected) { 
     this.newlySelected = newlySelected; 
    } 
} 

当你第一次增加该小区，将新选择，并不会呈现不同的颜色，默认是真实的，因为它没有通过检查

!cellSelectionSet.getCellAt(row, column).isNewlySelected() 

但是，当你按下该按钮，您遍历列表并将所有单元格newlySelected设置为false。

public void actionPerformed(ActionEvent e) { 
    //myCellRenderer.setShowSelected(true); 
    for (int i = 0; i < cellSelectionSet.getSize(); i++) { 
     cellSelectionSet.getElementAt(i).setNewlySelected(false); 
    } 
    table.repaint(); 
}