我想在JTable中使用灰色不可编辑的单元格。 我正在使用这样的TableCellRenderer：
TableColumn column = table.getColumnModel().getColumn(0);
column.setCellRenderer(new GrayableCheckboxCellRenderer());
public class GrayableCheckboxCellRenderer extends JCheckBox implements TableCellRenderer {
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int vRowIndex, int vColIndex) {
boolean editable = isEditable(vRowIndex, vColIndex);
setBackground(editable ? UIManager.getColor("Label.background") : Color.LIGHT_GRAY);
setSelected((Boolean) value);
if (isSelected) {
// TODO: cell (and perhaps other cells) are selected, need to highlight it
}
return this;
}
// perfomance
protected void firePropertyChange(String propertyName, Object oldValue, Object newValue) {}
public void firePropertyChange(String propertyName, boolean oldValue, boolean newValue) {}
public void revalidate() {}
public void validate() {}
}
这有效，但有一个令人讨厌的人工制品： 最初“复选框”是“左排列”，当我按下鼠标左键时，它移动到“居中排列”，当我释放鼠标按钮时，它会移回“左排列”。
如何避免这种恼人的人工制品，可能还有更简单的解决方案来解决我的问题？
答案 0 :(得分：5)
使用准备好的渲染器
的最简单方法import java.awt.*;
import java.util.Random;
import java.util.Vector;
import javax.swing.*;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellRenderer;
public class Forum {
private JFrame frame = new JFrame("Frame");
private JPanel fatherCenter = new JPanel();
private JScrollPane tableScroll = new JScrollPane();
private myTableModel tableModel;
private JTable dialogTable;
private ListSelectionModel lsDialog;
private void addComponentsToPane(Container pane) {
tableModel = new myTableModel();
dialogTable = new JTable(tableModel) {
private static final long serialVersionUID = 1L;
@Override
public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
Component comp = super.prepareRenderer(renderer, row, column);
JComponent jc = (JComponent) comp;//for Custom JComponent
if (!isRowSelected(row)) {
int modelRow = convertRowIndexToModel(row);
boolean type = (Boolean) getModel().getValueAt(modelRow, 2);
boolean type1 = (Boolean) getModel().getValueAt(modelRow, 3);
boolean type2 = (Boolean) getModel().isCellEditable(row, column);
comp.setForeground(Color.black);
if ((type) && (!type1)) {
comp.setBackground(Color.yellow);
} else if ((!type) && (type1)) {
comp.setBackground(Color.orange);
} else if ((!type) || (!type1)) {
comp.setBackground(Color.red);
//} else if ((!type2)) {
//comp.setForeground(Color.red);
//comp.setBackground(Color.magenta);
} else {
comp.setBackground(row % 2 == 0 ? getBackground() : getBackground().darker());
}
dialogTable.convertRowIndexToView(0);
} else {
comp.setForeground(Color.blue);
comp.setBackground(Color.lightGray);
}
if (!isCellEditable(row, column)) {
comp.setForeground(Color.red);
comp.setBackground(Color.magenta);
}
return comp;
}
};
tableScroll = new JScrollPane(dialogTable, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
tableScroll.setBorder(null);
dialogTable.getTableHeader().setReorderingAllowed(false);
dialogTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
lsDialog = dialogTable.getSelectionModel();
dialogTable.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);
dialogTable.setRowHeight(20);
dialogTable.setRowMargin(2);
fatherCenter = new JPanel();
fatherCenter.setLayout(new BorderLayout(10, 10));
fatherCenter.add(tableScroll, BorderLayout.CENTER);
pane.add(fatherCenter);
}
private void addData() {
Runnable doRun1 = new Runnable() {
@Override
public void run() {
tableModel.resetTable();
Vector<String> tbl = new Vector<String>();
Vector<Object> tbl1 = new Vector<Object>();
Random rnd = new Random();
tbl.add("Integer");
tbl.add("Double");
tbl.add("Boolean");
tbl.add("Boolean");
tbl.add("String");
tableModel.setColumnNames(tbl);
for (int row = 0; row < 30; row++) {
tbl1 = null;
tbl1 = new Vector<Object>();
tbl1.addElement(row + 1);
tbl1.addElement(rnd.nextInt(25) + 3.14);
tbl1.addElement((row % 3 == 0) ? false : true);
tbl1.addElement((row % 5 == 0) ? false : true);
if (row % 7 == 0) {
tbl1.add(("Canc"));
} else if (row % 6 == 0) {
tbl1.add(("Del"));
} else {
tbl1.add(("New"));
}
tableModel.addRow(tbl1);
}
addTableListener();
}
};
SwingUtilities.invokeLater(doRun1);
}
private void addTableListener() {
tableModel.addTableModelListener(new TableModelListener() {
@Override
public void tableChanged(TableModelEvent tme) {
if (tme.getType() == TableModelEvent.UPDATE) {
System.out.println("Cell " + tme.getFirstRow() + ", "
+ tme.getColumn() + " changed. The new value: "
+ tableModel.getValueAt(tme.getFirstRow(),
tme.getColumn()));
}
}
});
}
private void createAndShowGUI() {
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout(10, 10));
addComponentsToPane(frame.getContentPane());
addData();
frame.setLocation(150, 150);
frame.setPreferredSize(new Dimension(400, 646));
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
Forum osFrame = new Forum();
}
public Forum() {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createAndShowGUI();
}
});
}
private class myTableModel extends AbstractTableModel {
private static final long serialVersionUID = 1L;
private Vector<Vector<Object>> data;
private Vector<String> colNames;
private boolean[] _columnsVisible = {true, true, true, true, true};
myTableModel() {
this.colNames = new Vector<String>();
this.data = new Vector<Vector<Object>>();
}
myTableModel(Vector<String> colnames) {
this.colNames = colnames;
this.data = new Vector<Vector<Object>>();
}
public void resetTable() {
this.colNames.removeAllElements();
this.data.removeAllElements();
}
public void setColumnNames(Vector<String> colNames) {
this.colNames = colNames;
this.fireTableStructureChanged();
}
public void addRow(Vector<Object> data) {
this.data.add(data);
this.fireTableDataChanged();
this.fireTableStructureChanged();
}
public void removeRowAt(int row) {
this.data.removeElementAt(row);
this.fireTableDataChanged();
}
@Override
public int getColumnCount() {
return this.colNames.size();
}
@Override
public Class<?> getColumnClass(int colNum) {
switch (colNum) {
case 0:
return Integer.class;
case 1:
return Double.class;
case 2:
return Boolean.class;
case 3:
return Boolean.class;
default:
return String.class;
}
}
@Override
public boolean isCellEditable(int row, int colNum) {
switch (colNum) {
case 2:
return false;
default:
return true;
}
}
@Override
public String getColumnName(int colNum) {
return this.colNames.get(colNum);
}
@Override
public int getRowCount() {
return this.data.size();
}
@Override
public Object getValueAt(int row, int col) {
Vector<Object> value = this.data.get(row);
return value.get(col);
}
@Override
public void setValueAt(Object newVal, int row, int col) {
Vector<Object> aRow = data.elementAt(row);
aRow.remove(col);
aRow.insertElementAt(newVal, col);
fireTableCellUpdated(row, col);
}
public void setColumnVisible(int index, boolean visible) {
this._columnsVisible[index] = visible;
this.fireTableStructureChanged();
}
}
}
答案 1 :(得分：4)
在GrayableCheckboxCellRenderer中返回TableCellEditor的实例。
附录：在美学上，您可能希望根据当前Look＆amp; amp;提供的defaults来调整渲染器和编辑器的颜色。感觉，例如：
Color hilite = UIManager.getColor("Table.selectionBackground");
答案 2 :(得分：0)
只需在＆＃39; getTableCellRendererComponent（）＆＃39;中明确设置对齐方式。方法解决了这个问题。在从方法返回之前添加以下行。
setHorizontalAlignment(SwingConstants.CENTER);