使用getTableCellRendererComponent更改颜色JTable单元格 [英] change color JTable cells with getTableCellRendererComponent NOTHING HAPPENDS
问题描述
我正在尝试更改JTable中某些单元格的颜色.我试图在一个简单的示例中重写getTableCellRendererComponent,并且效果很好.但是,当我在项目中执行相同的操作时,则没有任何变化...
I am trying to change the color of some cells in my JTable. I have tried to override getTableCellRendererComponent in a simple example, and it works nice. But when I do the same in my project nothing changes...
我的JTable和我的JTable放在一个盒子里,像这样:
I have my JPanel with my JTable in a Box like this:
boxTable=Box.createHorizontalBox();
box2Table.add(boxTable);
//JTable
tablaContador = new JTable(datosContador,cabeceraContador);
//MODIF COLOR
tablaContador.setDefaultRenderer(Object.class, new ColorRenderer());
正在做
System.out.println(tablaContador.getColumnClass(3));
我知道setDefaultRenderer的第一个参数是Object.class 我不知道问题是否在这里...表中只有字符串,但是我试过了String.class却什么也没发生
I can know that the first parameter of setDefaultRenderer is Object.class I don't know if the problem is here... i have only strings in the Table, but I have tried String.class and nothing happens
然后,我修改JTable的单元格的某些内容:
Then I modify some things of JTable's Cells:
tablaContador.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
boxTable.add(tablaContador);
//Align cells
for (int i=0; i<cabeceraContador.length;i++){
tablaContador.getColumnModel().getColumn(i).setCellRenderer(alinearCeldas);
}
//Modify cells' width
tablaContador.getColumnModel().getColumn(0).setMinWidth(150);
for (int i=1; i<cabeceraContador.length;i++){
tablaContador.getColumnModel().getColumn(i).setMaxWidth(40);
}
//Scroll for the Table
scrollContador=new JScrollPane(tablaContador,JScrollPane.VERTICAL_SCROLLBAR_NEVER,JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
scrollContador.setPreferredSize(new Dimension(1000,80));
scrollContador.setMinimumSize(new Dimension(1000,80));
scrollContador.setMaximumSize(new Dimension(2000,80));
//Add scroll to the box
box2Table.add(scrollContador);
我的ColorRenderer类是:
And my ColorRenderer class is:
public class ColorRenderer extends DefaultTableCellRenderer{
private Component c;
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,int row, int column) {
c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
c.setBackground(Color.BLUE);
return c;
}
}
所以它在我的项目中不起作用,我不知道为什么
So It does not work in my project i don't know why
有什么主意吗?
解冻!
推荐答案
我看到了:
tablaContador.setDefaultRenderer(Object.class, new ColorRenderer());
然后我看到:
for (int i=0; i<cabeceraContador.length;i++)
{
tablaContador.getColumnModel().getColumn(i).setCellRenderer(alinearCeldas);
}
将渲染器分配给特定列的优先级高于设置默认渲染器,因此从不使用颜色渲染器.
The assignment of the renderer to a specific column takes precedence over setting the default renderer so your color renderer is never used.
并不是您要尝试做的完全是什么,但是我想您需要将颜色渲染逻辑添加到对齐渲染器中.换句话说,所有渲染逻辑必须包含在单个渲染器中.您不能合并多个渲染器.
Not exactly what you are trying to do, but I would guess you need to add the color rendering logic to the alignment renderer. In other words all the rendering logic must be contained in a single renderer. You can't merge multiple renderers.
这是自定义渲染器的一个简单示例:
Here is a simple example of a custom renderer:
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
public class TableRenderer extends JPanel
{
public TableRenderer()
{
String[] columnNames = {"String", "Integer"};
Object[][] data =
{
{"A", new Integer(1)},
{"B", new Integer(2)},
{"C", new Integer(10)},
{"D", new Integer(4)}
};
DefaultTableModel model = new DefaultTableModel(data, columnNames);
JTable table = new JTable( model );
table.setPreferredScrollableViewportSize(table.getPreferredSize());
JScrollPane scrollPane = new JScrollPane( table );
add( scrollPane );
// Override default renderer on a specific column
TableCellRenderer colorRenderer = new ColorRenderer();
table.getColumnModel().getColumn(1).setCellRenderer( colorRenderer );
}
/*
** Color the focused cell
*/
class ColorRenderer extends DefaultTableCellRenderer
{
public ColorRenderer()
{
super();
setHorizontalAlignment(JLabel.RIGHT);
}
@Override
public Component getTableCellRendererComponent(
JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
{
super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (isSelected)
setBackground( table.getSelectionBackground() );
else
{
setBackground( null );
try
{
int number = Integer.parseInt( value.toString() );
if (number > 9)
setBackground( Color.RED );
}
catch(Exception e) {}
}
return this;
}
}
private static void createAndShowGUI()
{
JFrame frame = new JFrame("Color Renderer");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TableRenderer());
frame.pack();
frame.setLocationByPlatform( true );
frame.setVisible( true );
}
public static void main(String[] args)
{
EventQueue.invokeLater( () -> createAndShowGUI() );
/*
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowGUI();
}
});
*/
}
}
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