java AbstractTableModel 2每行不同的颜色
作者：互联网
我想提高我的jtable的可读性,下面是MyTableModel.java类,如何使每行有2种不同的颜色shown in this picture.应该具体的方法是我可以为每一行赋予不同的颜色以增加用户的可读性.
public class MyTableModel extends AbstractTableModel{
String [] columnNames;
Vector<Vector<Object>> data;
public DataAccessObject ObjDb = new DataAccessObject ();
public MyTableModel(String [] coln , Vector<Vector<Object>> data)
{
columnNames = coln;
this.data =data;
}
@Override
public int getColumnCount() {
return columnNames.length;
}
@Override
public int getRowCount() {
return data.size();
}
@Override
public String getColumnName(int col) {
return columnNames[col];
}
public Object getValueAt(int row, int col) {
return data.get(row).get(col);
}
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
}
public boolean isCellEditable(int row, int col) {
if (col <= 0) {
return true;
} else {
return true;
}
}
public void setValueAt(Object value, int row, int col) {
data.get(row).set(col, value);
fireTableCellUpdated(row, col);
}
private class RowListener implements ListSelectionListener {
public void valueChanged(ListSelectionEvent event) {
if (event.getValueIsAdjusting()) {
return;
}
// output.append("ROW SELECTION EVENT. ");
// outputSelection();
}
}
private class ColumnListener implements ListSelectionListener {
public void valueChanged(ListSelectionEvent event) {
if (event.getValueIsAdjusting()) {
return;
}
// output.append("COLUMN SELECTION EVENT. ");
// outputSelection();
}
}
}
Netbeans自动创建了我的jtable,变量名称我设置为mytable然后我
在下面定义prepareRenderer时遇到问题,我是否会错过这里的步骤？我想做
每行有不同的颜色这是我的示例代码如下.
mytable.prepareRenderer(TableCellRenderer renderer, int row, int column)
{
Component c = super.prepareRenderer(renderer, row, column);
// Alternate row color
if (!isRowSelected(row))
c.setBackground(row % 2 == 0 ? getBackground() : Color.LIGHT_GRAY);
return c;
}
};
我也使用这个,但这设置5列我有7列剩下两个不是
最后点亮,当我点击白色的行时,文字颜色消失.
mytable.setDefaultRenderer(Object.class, new TableCellRenderer() {
private DefaultTableCellRenderer DEFAULT_RENDERER = new DefaultTableCellRenderer();
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean
isSelected, boolean hasFocus, int row, int column) {
Component c = DEFAULT_RENDERER.getTableCellRendererComponent(table, value,
isSelected, hasFocus, row, column);
System.out.println(column);
if (row % 2 == 0) {
c.setBackground(Color.WHITE);
} else {
c.setBackground(Color.LIGHT_GRAY);
}
return c;
}
});
解决方法:
你可以…
使用SwingLabs, SwingX library的JXTable,它具有可以执行此操作的功能…如果您可以使用第三方库,这将是我的首选解决方案…
你可以…
使用Nimbus外观和感觉这样做……但是这使您无法使用其他外观(如系统的外观和感觉)
你可以…
创建您自己的一系列自定义TableCellRenderers,它们根据当前行为其背景着色…这对于您可能需要的每个单元格渲染器来说都很乏味,需要能够执行此操作…
你可以…
覆盖JTable的prepareCellRenderer方法并根据行强制设置单元格渲染器的背景…我不是这个解决方案的粉丝,因为它强制设计选择到渲染器上,这可能不符合它的要求(覆盖单元格渲染器可能需要的值)并将您锁定到表的特定实现中…
你可以…
创建一个JViewport,它能够与JTable交谈,并在桌子底下渲染糖果,但桌子和渲染器需要透明……我已经完成了这个,它……复杂……但允许我继续糖果剥离视口的全长(超出桌子的可渲染区域)……
更新了JViewport示例
这是我前一段时间为项目实现的概念的一个例子(它实际上是由一个接口管理的,所以我也可以包含JList和JTextArea,但这是另一个问题)……
基本上,它使得出现在JTable下面的JViewport负责渲染实际的糖果剥离.
但为什么？”你问…因为它不会影响表格或单元格渲染器.这样做的唯一要求是表和单元格渲染器都是透明的(除非必须这样).
这意味着,您不需要在渲染器中放置糖果剥离逻辑,这意味着您不需要覆盖您创建的每个表的prepareRenderer并破坏单元格渲染器的要求……
它远非完美,但展示了基本理念……
好的,但为什么要这么麻烦？嗯,基本上,这种方法可以让你画出超出桌子绘制的区域……
import java.awt.Color;
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JViewport;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class CandyStrippedTable {
public static void main(String[] args) {
new CandyStrippedTable();
}
public CandyStrippedTable() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
Object[] columns = new Object[10];
for (int col = 0; col < columns.length; col++) {
columns[col] = (char) (65 + col);
}
Object[][] data = new Object[10][10];
for (int row = 0; row < data.length; row++) {
for (int col = 0; col < data[row].length; col++) {
data[row][col] = row + "x" + col;
}
}
DefaultTableModel model = new DefaultTableModel(data, columns);
JTable table = new JTable(model);
table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
setOpaque(isSelected);
return this;
}
});
table.setFillsViewportHeight(true);
table.setOpaque(false);
JScrollPane sp = new JScrollPane();
sp.setViewport(new CandyStrippedViewPort(new Color(255, 0, 0, 128)));
sp.setViewportView(table);
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(sp);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class CandyStrippedViewPort extends JViewport {
private Color candyStrippedColor;
public CandyStrippedViewPort(Color color) {
candyStrippedColor = color;
}
public Color getCandyStrippedColor() {
return candyStrippedColor;
}
public void setCandyStrippedColor(Color candyStrippedColor) {
this.candyStrippedColor = candyStrippedColor;
repaint();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.setColor(getCandyStrippedColor());
Component view = getView();
if (view instanceof JTable) {
JTable table = (JTable) view;
Rectangle viewRect = getViewRect();
int y = 0;
int row = 0;
if (table.getRowCount() > 0) {
row = table.rowAtPoint(viewRect.getLocation());
while (row < table.getRowCount()) {
int rowHeight = table.getRowHeight(row);
Rectangle cellRect = table.getCellRect(row, 0, true);
if (row % 2 == 0) {
g2d.fillRect(0, cellRect.y - viewRect.y, getWidth(), cellRect.height);
}
y = cellRect.y + cellRect.height;
row++;
}
}
int rowHeight = table.getRowHeight();
while (y < getHeight()) {
if (row % 2 == 0) {
g2d.fillRect(0, y, getWidth(), rowHeight);
}
row++;
y += rowHeight;
}
}
g2d.dispose();
}
}
}
格式化单元格渲染器中的数字
你可以从……开始
obj.table.setDefaultRenderer(Double.class,
new DefaultTableCellRenderer() {
@Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
if (value instanceof Number) {
value = NumberFormat.getNumberInstance().format(value);
}
super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
setOpaque(isSelected);
return this;
}
});
如果由于某种原因,默认格式适合,你可以做类似……
obj.table.setDefaultRenderer(Double.class,
new DefaultTableCellRenderer() {
@Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
if (value instanceof Number) {
NumberFormat ni = NumberFormat.getNumberInstance();
ni.setMaximumFractionDigits(2)
value = ni.format(value);
}
super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
setOpaque(isSelected);
return this;
}
});
代替
标签：java,colors,swing,jtable,abstracttablemodel 来源： https://codeday.me/bug/20190927/1825044.html