Go语言视频零基础入门到精通

kniwew

// MyTableRenderer.java

import java.awt.Color;
import java.awt.Component;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;

public class MyTableRenderer extends DefaultTableCellRenderer {
private static final long serialVersionUID = 6940369712189637052L;

private int rows = 0;
private int cols = 0;

private Color[][] fg = null;
private Color[][] bg = null;

private Color defaultFg = Color.BLACK;
private Color defaultBg = Color.WHITE;

private JTable table = null;

public MyTableRenderer(JTable table) {
  if (table == null) return;
  
  this.table = table;
  table.setDefaultRenderer(Object.class, this);
  
  defaultFg = table.getForeground();
  defaultBg = table.getBackground();
  
  rows = table.getRowCount();
  cols = table.getColumnCount();
  if (rows > 0 && cols > 0) {
   fg = new Color[rows][cols];
   bg = new Color[rows][cols];
  }
}

public void setCellBgColor(int row, int col, Color color) {
  if (row < 0 || col < 0) return;
  if (row >= rows || col >= cols) return;
  bg[row][col] = color;
  if (table != null) table.repaint();
}

public void setCellFgColor(int row, int col, Color color) {
  if (row < 0 || col < 0) return;
  if (row >= rows || col >= cols) return;
  fg[row][col] = color;
  if (table != null) table.repaint();
}

public Component getTableCellRendererComponent(
   JTable table, Object value, boolean isSelected,
   boolean hasFocus, int row, int column) {
  
  super.getTableCellRendererComponent(table,
   value, isSelected, hasFocus, row, column);
  setForeground(defaultFg);
  setBackground(defaultBg);
  int realCol = table.convertColumnIndexToModel(column);
  if (fg != null && fg[row][realCol] != null) {
   setForeground(fg[row][realCol]);
  }
  if (bg != null && bg[row][realCol] != null) {
   setBackground(bg[row][realCol]);
  }
  
  return this;
}
}




/*** 用法示例 ***/

// JTableDemo.java

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class JTableDemo implements ActionListener {
private MyTableRenderer renderer = null;

Color[] colors = {
   Color.BLUE, Color.CYAN, Color.DARK_GRAY,
   Color.GREEN, Color.RED, Color.YELLOW
};
int currentColor = 0;

@Override
public void actionPerformed(ActionEvent e) {
  renderer.setCellBgColor(0, 0, colors[currentColor]);
  renderer.setCellFgColor(1, 1, colors[currentColor]);
  currentColor = (currentColor+1) % colors.length;
}

public void Demo() {
  Object[] title = { "Title1", "Title2", "Title3" };
  Object[][] data = { {10, 11, 12}, {20, 21, 22} };

  DefaultTableModel model = new DefaultTableModel(data, title);
  JTable table = new JTable(model);
  renderer = new MyTableRenderer(table);
  renderer.setCellBgColor(0, 2, Color.PINK);
  
  JButton button = new JButton("Change");
  button.addActionListener(this);
  button.setPreferredSize(new Dimension(120,30));
  
  JScrollPane pnl2 = new JScrollPane(table);
  JPanel pnl3 = new JPanel();
  pnl3.add(button);
  
  JPanel pnl = new JPanel(new BorderLayout());
  pnl.add(pnl2, BorderLayout.CENTER);
  pnl.add(pnl3, BorderLayout.SOUTH);
  
  JFrame wnd = new JFrame("JTable Demo");
  wnd.setPreferredSize(new Dimension(300,200));
  wnd.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  wnd.getContentPane().add(pnl);
  wnd.pack();
  wnd.setVisible(true);
}

public static void main(String[] args) {
  JTableDemo me = new JTableDemo();
  me.Demo();
}
}