我用GlazedList eventList创建了一个JTable。
我搜索了API，但是我不知道如何在此表中添加撤消/重做的可能性。我在API中找到以下类别：UndoRedoSupport undoRedoSupport = new UndoRedoSupport<"what here?">("argument?"); UndoSupport undoSupport = new UndoSupport<"what to write here?">("argument?");
有谁知道如何使用它？
private void createComponents() {
EventList<Dien> eventList = new BasicEventList<Dien>();
actionList = GenericsUtil.makeList();
table = new WebTable();
searchField = new WebTextField(60);
String[] headers = new String[]{"Code", "Name", "Number"};
String[] properties = new String[]{"Code", "Name", "Number"};
TextFilterator<Dien> dienFilterator = new TextFilterator<Dien>() {
public void getFilterStrings(List baseList, Dien dien) {
baseList.add(dien.getCode());
baseList.add(dien.getName());
baseList.add(dien.getNumber());
}
};
MatcherEditor<Dien> textMatcherEditor = new TextComponentMatcherEditor<Dien>(searchField, dienFilterator);
eventList = toolModel.getDiens();
FilterList<Dien> filterList = new FilterList<Dien>(eventList, textMatcherEditor);
TableFormat tableFormat = GlazedLists.tableFormat(properties, headers, new boolean[]{true,true,true});
model = new EventTableModel<Dien>(filterList, tableFormat);
model.addTableModelListener(new TableModelListener() {
public void tableChanged(TableModelEvent e) {
if(e.getType()==TableModelEvent.UPDATE){
if(!panel.isPendingChanges())
panel.setPendingChange(true);
}
}
});
selectionModel = new EventSelectionModel<Dien>(filterList);
table.setSelectionModel(selectionModel);
table.setModel(model);
}
最佳答案
内置于GlazedLists的Undo / Redo类没有公共构造函数。而是通过UndoRedoSupport.install()静态方法将支持安装到特定事件列表。
当然，如果您使用的是Swing，则可以利用Swing的UndoManager类，而GlazedLists提供了一个带有UndoSupport类的简单包装器。同样，这只是用其install()方法初始化。
我创建了一个简单的Swing示例应用程序作为示例，以说明如何使用这些类。在我的示例中，我使用了一个简单的EventList字符串和一个JList。但这将应用于所有GlazedList支持的组件-UndoRedoSupport应用于EventList本身，而不是Swing组件。
import ca.odell.glazedlists.BasicEventList;
import ca.odell.glazedlists.EventList;
import ca.odell.glazedlists.swing.EventListModel;
import ca.odell.glazedlists.swing.UndoSupport;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.undo.UndoManager;
public class GlazedListsUndoSample {
private JFrame mainFrame;
private JButton addItemButton;
private JButton undoButton;
private JButton redoButton;
private UndoManager undoManager;
private EventList<String> eventList = new BasicEventList<String>();
public GlazedListsUndoSample() {
//populateAvailableBooks();
createGui();
mainFrame.setVisible(true);
}
private void updateButtons() {
//addBookButton.setEnabled(!books.isEmpty());
undoButton.setEnabled(undoManager.canUndo());
redoButton.setEnabled(undoManager.canRedo());
}
private void createGui() {
undoManager = new UndoManager();
UndoSupport.install(undoManager, eventList);
mainFrame = new JFrame("GlazedLists Undo Example");
mainFrame.setSize(600, 400);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
EventListModel model = new EventListModel(eventList);
JList list = new JList(model);
JPanel mainPanel = new JPanel(new BorderLayout());
mainPanel.add(new JScrollPane(list), BorderLayout.CENTER);
JPanel addBookPanel = new JPanel(new BorderLayout());
addBookPanel.add(new JLabel("Item"), BorderLayout.WEST);
final JTextField titleTextField = new JTextField(50);
addBookPanel.add(titleTextField, BorderLayout.CENTER);
addItemButton = new JButton("Add Item");
addItemButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
eventList.add(titleTextField.getText());
updateButtons();
}
});
addBookPanel.add(addItemButton, BorderLayout.EAST);
JPanel buttonPanel = new JPanel();
undoButton = new JButton("Undo");
undoButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (undoManager.canUndo()) {
undoManager.undo();
}
updateButtons();
}
});
redoButton = new JButton("Redo");
redoButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (undoManager.canRedo()) {
undoManager.redo();
}
updateButtons();
}
});
updateButtons();
buttonPanel.add(undoButton);
buttonPanel.add(redoButton);
mainPanel.add(addBookPanel, BorderLayout.NORTH);
mainPanel.add(buttonPanel, BorderLayout.SOUTH);
mainFrame.getContentPane().setLayout(new BorderLayout());
mainFrame.getContentPane().add(mainPanel, BorderLayout.CENTER);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new GlazedListsUndoSample();
}
});
}
}
值得注意的是documentation确实暗示了其功能限制：
并非ListEvent中描述的每个更改都会导致无法撤消的编辑。
具体来说，列表元素IN PLACE的突变不会产生
不可撤消的修改。例如，观察到的ObservableElementList
元素的更改，或使用相同的对List.set（int，E）的调用
该索引处的对象会产生一个没有
对应的UndoRedoSupport.Edit对象。这些ListEvent是
被忽略，因为他们缺乏足够的信息来撤消或重做
更改。
通常，UndoRedoSupport仅适用于与
BasicEventList或围绕BasicEventList的琐碎包装器
不影响元素的顺序或类型，例如
ObservableElementList。高级转换，例如SortedList或
FilterList将无法与此UndoRedoSupport类一起正常工作
因为它们的内容受外部信息的控制
自己（比较器和匹配器）。