问题描述
我想根据第1列中的值给表单元格上色.如果值不等于第1列中的值，则颜色应为青色，但我的代码不起作用:
i want to color my table cells according to the Value in Column 1, if the values isn´t equal to the value in Column 1 the color should be cyan, but my code doesnt work:
table = new JTable(){
public TableCellRenderer getCellRenderer(int row, int column) {
TableCellRenderer tcr=null;
Color c;
if(column>=1&&getValueAt(row, column)!=null &&getValueAt(row, 1)!=null &&!getValueAt(row, column).equals(getValueAt(row, 1)))
c=Color.CYAN;
else
c=Color.white;
if(getValueAt(row, column) instanceof Boolean) {
tcr= super.getDefaultRenderer(Boolean.class);
} else {
tcr= super.getCellRenderer(row, column);
}
tcr.getTableCellRendererComponent(this, getValueAt(row, column), isCellSelected(row, column) , hasFocus(), row, column).setBackground(c);
return tcr;
}
public TableCellEditor getCellEditor(int row, int column) {
if(getValueAt(row, column) instanceof Boolean) {
return super.getDefaultEditor(Boolean.class);
} else {
return super.getCellEditor(row, column);
}
}
};
table.setModel(new DefaultTableModel(
new Object[][] {
{"Row1", "1","2","3"},
{"Row2", "2","2","3"},
{"Row3", "2","2","2"},
{"Row3", "2","1","2"}
},
new String[] {"Header1", "Header2","Header3","Header4"}
));
推荐答案
必须在TableCellRenderer中做出是否必须突出显示单元格的决定.它不能在JTable中进行.因此，(没有)没有理由要重写JTable中的方法.相反，您可以将列的CellRenderer设置为TableCellRenderer的自己体现.
The decision of whether a cell must be highlighted must be made in the TableCellRenderer. It can not be made in the JTable. So there is (probably) no reason to override the methods in JTable. Instead, you can set the CellRenderer for the columns to be your own implmenentation of the TableCellRenderer.
在此示例中，第2列和第3列接收"ColoringCellRenderer".如果此单元格中的值不为null且与第1列中的值相同，则此ColoringCellRenderer将突出显示某个单元格.
In this example, the columns 2 and 3 receive a "ColoringCellRenderer". This ColoringCellRenderer will highlight a certain cell if the value in this cell is not null and the same as the value in column 1.
import java.awt.Color;
import java.awt.Component;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;
public class ColoredTableCells
{
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
@Override
public void run()
{
createAndShowGUI();
}
});
}
private static void createAndShowGUI()
{
JFrame f = new JFrame();
f.getContentPane().add(new JScrollPane(createTable()));
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
static JTable createTable()
{
class ColoringTableCellRenderer extends DefaultTableCellRenderer
{
ColoringTableCellRenderer()
{
setOpaque(true);
}
@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 (highlightCell(table, row, column))
{
setBackground(Color.CYAN);
}
else
{
setBackground(Color.WHITE);
}
return this;
}
private boolean highlightCell(JTable table, int row, int column)
{
Object thisValue = table.getValueAt(row, column);
Object referenceValue = table.getValueAt(row, 1);
if (thisValue != null && referenceValue != null)
{
return thisValue.equals(referenceValue);
}
return false;
}
}
JTable table = new JTable();
table.setModel(new DefaultTableModel(new Object[][] {
{ "Row1", "1", "2", "3" },
{ "Row2", "2", "2", "3" },
{ "Row3", "2", "2", "2" },
{ "Row3", "2", "1", "2" } },
new String[] { "Header1", "Header2", "Header3", "Header4" }));
for (int i=2; i<table.getColumnCount(); i++)
{
TableColumn column = table.getColumnModel().getColumn(i);
column.setCellRenderer(new ColoringTableCellRenderer());
}
return table;
}
}
答案已经被接受，但是对于评论，使用了不同的版本:
The answer was accepted already, but in response to the comments, a different version:
该类使用两个类，"DelegatingTableCellRenderer"和"DelegatingTableCellEditor".这些类各自接收各自的委托，并且仅设置委托所传递的单元格组件的背景色.
This one uses two classes, "DelegatingTableCellRenderer" and "DelegatingTableCellEditor". These classes each receive the respective delegate, and only set the background color of the cell component that is delivered by the delegate.
这样，着色表单元格(用于渲染器或编辑器)的功能与实际渲染器分离.因此，可以为例如Boolean值(显示JCheckBox)的默认CellRenderer的背景着色.
This way, the functionality of coloring table cells (for renderers or editors) is decoupled from the actual renderer. Thus, it is possible to color, for example, the background of a the default CellRenderer for Boolean values (which shows a JCheckBox).
import java.awt.Color;
import java.awt.Component;
import java.util.EventObject;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.event.CellEditorListener;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
public class ColoredTableCells2
{
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
@Override
public void run()
{
createAndShowGUI();
}
});
}
private static void createAndShowGUI()
{
JFrame f = new JFrame();
f.getContentPane().add(new JScrollPane(createTable()));
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
static JTable createTable()
{
JTable table = new JTable()
{
@Override
public Class<?> getColumnClass(int column)
{
if (column == 0)
{
return Object.class;
}
return Boolean.class;
}
};
table.setDefaultEditor(Boolean.class,
new DelegatingTableCellEditor(table.getDefaultEditor(Boolean.class)));
table.setDefaultRenderer(Boolean.class,
new DelegatingTableCellRenderer(table.getDefaultRenderer(Boolean.class)));
table.setModel(new DefaultTableModel(new Object[][] {
{ "Row1", true, false, true },
{ "Row2", true, true, false },
{ "Row3", false, false, true },
{ "Row3", false, true, false } },
new String[] { "Header1", "Header2", "Header3", "Header4" }));
return table;
}
static class DelegatingTableCellEditor implements TableCellEditor
{
private final TableCellEditor delegate;
DelegatingTableCellEditor(TableCellEditor delegate)
{
this.delegate = delegate;
}
@Override
public Object getCellEditorValue()
{
return delegate.getCellEditorValue();
}
@Override
public boolean isCellEditable(EventObject anEvent)
{
return delegate.isCellEditable(anEvent);
}
@Override
public boolean shouldSelectCell(EventObject anEvent)
{
return delegate.shouldSelectCell(anEvent);
}
@Override
public boolean stopCellEditing()
{
return delegate.stopCellEditing();
}
@Override
public void cancelCellEditing()
{
delegate.cancelCellEditing();
}
@Override
public void addCellEditorListener(CellEditorListener l)
{
delegate.addCellEditorListener(l);
}
@Override
public void removeCellEditorListener(CellEditorListener l)
{
delegate.removeCellEditorListener(l);
}
@Override
public Component getTableCellEditorComponent(JTable table,
Object value, boolean isSelected, int row, int column)
{
Component component =
delegate.getTableCellEditorComponent(
table, value, isSelected, row, column);
if (component instanceof JComponent)
{
JComponent c = (JComponent)component;
c.setOpaque(true);
}
if (highlightCell(table, row, column))
{
component.setBackground(Color.CYAN);
}
else
{
component.setBackground(Color.WHITE);
}
return component;
}
}
static class DelegatingTableCellRenderer extends DefaultTableCellRenderer
{
private final TableCellRenderer delegate;
DelegatingTableCellRenderer(TableCellRenderer delegate)
{
this.delegate = delegate;
}
@Override
public Component getTableCellRendererComponent(
JTable table, Object value, boolean isSelected,
boolean hasFocus, int row, int column)
{
Component component =
delegate.getTableCellRendererComponent(
table, value, isSelected, hasFocus, row, column);
if (component instanceof JComponent)
{
JComponent c = (JComponent)component;
c.setOpaque(true);
}
if (highlightCell(table, row, column))
{
component.setBackground(Color.CYAN);
}
else
{
component.setBackground(Color.WHITE);
}
return component;
}
}
private static boolean highlightCell(JTable table, int row, int column)
{
if (column == 1)
{
return false;
}
Object thisValue = table.getModel().getValueAt(row, column);
Object referenceValue = table.getModel().getValueAt(row, 1);
if (thisValue != null && referenceValue != null)
{
return thisValue.equals(referenceValue);
}
return false;
}
}
这篇关于彩色表单元格的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！