我已经在摇摆中实现了一个树表,参考此处提供的教程 。我有两列,其中将显示 Message 下的 Message Object 或 Fields 对象。如果节点是字段,那么它的值将显示在第二列中。我可以成功查看所需的数据,将单元格渲染器添加到第二列,其中值是一个集合,然后向单元格添加一个组合框。当我添加单元格编辑器时,问题就来了。下面是我的单元格编辑器。
private class ValueCellEditor extends AbstractCellEditor implements TableCellEditor {
JTextField textEditor = new JTextField();
JComboBox comboBox = new JComboBox();
Component comp;
Field field = null;
private ValueCellEditor(){
int row=myTreeTable.getSelectedRow();
Object object= myTreeTable.getValueAt(row, 3);
TreePath path= myTreeTable.getPathForRow(row);
Object o= path.getLastPathComponent();
MyDataNode node=(MyDataNode)o;
Field f=(Field)node.getNodeDataObject();
comboBox.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
if(field!=null){
if(e.getStateChange() == ItemEvent.SELECTED) {
field.setSelectedValue(comboBox.getSelectedItem());
field.setDefaultValue(comboBox.getSelectedItem());
}
}
}
});
textEditor.addKeyListener(new KeyAdapter() {
@Override
public void keyReleased(KeyEvent e) {
if(field!=null){
field.setDefaultValue(textEditor.getText());
}
}
});
}
@Override
public Component getTableCellEditorComponent
(JTable table, Object value, boolean isSelected, int row, int column) {
if(value instanceof List<?>) {
populateComboBox((ArrayList)value);
comp = comboBox;
} else {
textEditor.setText((String)value);
comp = textEditor;
}
return comp;
}
@Override
public Object getCellEditorValue() {
if(comp != null && comp instanceof JTextField ) {
return textEditor.getText();
} else if( comp != null && comp instanceof JCheckBox) {
return comboBox.getSelectedItem();
}
return null;
}
private void populateComboBox(List<Value> valueList){
comboBox.removeAll();
comboBox.setSelectedItem(null);
for (Value val: valueList) {
comboBox.addItem(val.getDescription());
}
if(field.getSelectedValue() != null) {
comboBox.setSelectedItem(field.getSelectedValue());
}
}
}
在我的单元格编辑器的构造函数中,我添加了如下代码,通过它我试图获取树表选定行的当前选定节点。但是我输入的代码不起作用,因为“getPathForRow”函数不支持树表。
int row=myTreeTable.getSelectedRow();
Object object= myTreeTable.getValueAt(row, 3);
TreePath path= myTreeTable.getPathForRow(row);
Object o= path.getLastPathComponent();
MyDataNode node=(MyDataNode)o;
Field f=(Field)node.getNodeDataObject();
这是我正在使用的表格模型。
import com.milleniumit.walle.frontend.frontEndDto.Field;
public class MyDataModel extends MyAbstractTreeTableModel {
static protected String[] columnNames = { "Field", "Value" };
static protected Class<?>[] columnTypes =
{ MyTreeTableModel.class, Object.class};
public MyDataModel(MyDataNode rootNode) {
super(rootNode);
root = rootNode;
}
public Object getChild(Object parent, int index) {
return ((MyDataNode) parent).getChildren().get(index);
}
public int getChildCount(Object parent) {
return ((MyDataNode) parent).getChildren().size();
}
public int getColumnCount() {
return columnNames.length;
}
public String getColumnName(int column) {
return columnNames[column];
}
public Class<?> getColumnClass(int column) {
return columnTypes[column];
}
public Object getValueAt(Object node, int column) {
MyDataNode mNode=(MyDataNode)node;
Object obj =mNode.getNodeDataObject();
if(column==0){
return mNode.getName();
}
else if (column==1){
if(obj instanceof Field){
Field field=(Field)mNode.getNodeDataObject();
if(field.getFieldDef().getListValue().size()>0){
return field.getFieldDef().getListValue();
}
else
return mNode.getDefaultValue();
}
else
return mNode.getDefaultValue();
}
return null;
}
public boolean isCellEditable(Object node, int column) {
return true; // Important to activate TreeExpandListener
}
public void setValueAt(Object aValue, Object node, int column) {
MyDataNode mNode=(MyDataNode)node;
if (mNode.getNodeDataObject() instanceof Field && column == 1) {
Field field = (Field) mNode.getNodeDataObject();
field.setDefaultValue(aValue);
field.setSelectedValue(aValue);
}
}
}
我需要获取树表的选定节点,以便我可以获取当前选定的字段以通过编辑器编辑它的更改值。有人可以让我知道我的代码哪里出错了。获取此树表的当前选定节点的正确方法是什么。