Question

I m使用一个配有电池使器的桌子,使我能够在每个具有价值的囚室里放置一个子子“x”,以便通过向纽伦施压来删除电池的价值。编辑将行动听众指派到纽特,在纽特州受到压力时,应采取适当行动。

表格模型中每个栏目都包含一系列的数值。我成功地设法从阵列清单中删除了正确价值,在变动之后,将 but子和桌旁的所有其他细胞重新抬头,但价值被删除的囚室保持不变。如果重新启动申请或增加申请表的数值,则表格按预期复读,一切照旧。

那么,问题就好像牢房的开端人忘记了囚室的最初价值,因此,即使桌子重开,仍然继续将这一价值印制到囚室。是否有任何人的想法是,如何适当更新表格,以便正确显示价值观?

表:

public class Table extends JTable {

public static DefaultTableModel model = new DefaultTableModel();
private Days d;
private JFrame frame;
private AddCellRenderer renderer;
private AddCellEditor editor;

public Table(Days d, JFrame frame) {
    // Assign the table model to the table
    super(model);
    this.d = d;
    this.frame = frame;

    // Define dimensions of table
    model.setRowCount(11);
    model.setColumnCount(5);

    // Block resizing and reordering of headers
    this.setColumnSelectionAllowed(false);
    this.setRowSelectionAllowed(false);
    this.setCellSelectionEnabled(true);
    this.setTableHeader(null);

    // Define first row height
    this.setRowHeight(38);
    // Define all other row s heights
    this.setRowHeight(0, 45);

    this.d.setTable(this);

    for (int i = 0; i < 5; i++) {
        editor = new AddCellEditor(new JCheckBox(), d.getVisibleDays().get(i), this);
        renderer = new AddCellRenderer(d.getVisibleDays().get(i), editor);
        this.getColumnModel().getColumn(i).setCellRenderer(renderer);
        this.getColumnModel().getColumn(i).setCellEditor(editor);
    }

    this.refresh();
}

public void refresh() {

    // Empty table
    for (int i = 0; i < 5; i++) {
        for (int j = 0; j < 11; j++) {
            this.getModel().setValueAt(null, j, i);
        }
    }

    // Populate table with entries for each day
    for (int i = 0; i < 5; i++) {

        Iterator<String> iterator = d.getVisibleDays().get(i).getEntryListIterator();

        int j = 0;

        while(iterator.hasNext()){
            String s = iterator.next();
            this.getModel().setValueAt(s, (j+1), i);
            j++;
        }

        this.getModel().setValueAt(d.getVisibleDays().get(i).getDayName(), 0, i);
    }
}

public void modelClearValueAt(int row, int column) {
    this.getModel().setValueAt(null, row, column);
}
}

单元编辑班:

public class AddCellEditor extends DefaultCellEditor {

private JPanel headerPanel;
private JPanel entryPanel;
private JLabel dayName;
private JLabel entryValue;
protected JButton addButton;
private JButton removeButton;
private String label;
private int row;
private int column;
private Day day;
private String date;
private Table table;
private AddCellRenderer renderer;

public AddCellEditor(JCheckBox checkBox, Day day, Table table) {
    super(checkBox);
    this.day = day;
    this.table = table;
    date = day.getDayDate();
    headerPanel = new JPanel();
    headerPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
    entryPanel = new JPanel();
    entryPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
    dayName = new JLabel();
    entryValue = new JLabel();
    addButton = new JButton();
    removeButton = new JButton();
    headerPanel.add(dayName);
    headerPanel.add(addButton);
    entryPanel.add(entryValue);
    entryPanel.add(removeButton);
    addButton.setOpaque(true);
    addButton.setPreferredSize(new Dimension(16, 16));
    removeButton.setOpaque(true);
    removeButton.setPreferredSize(new Dimension(16, 16));
    addButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            System.out.println("Add pressed");
            addItem();
            fireEditingStopped();
        }
    });
    removeButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            System.out.println("Remove pressed");
            removeItem();
            getTable().refresh();
            fireEditingStopped();
        }
    });

}

public void setRenderer(AddCellRenderer renderer) {
    this.renderer = renderer;
}

public Component getTableCellEditorComponent(JTable table, 
        Object value, boolean isSelected, int row, int column) {

    this.row = row;
    this.column = column;

    if (row == 0) {
         return this.headerPanel;
    }
    if (row != 0 && value != null) {
        return this.entryPanel;
    }
    return null;
}

public void addItem() {
    String input = JOptionPane.showInputDialog("Add entry for " + label + ":");

    if ((input != null) && (input.length() > 0)) {
        System.out.println("Added: " + input + "Item");
        day.addEntry(input, column);
    }
}

public void removeItem() {
    table.modelClearValueAt(row, column);
    day.removeEntry(row-1);
    System.out.println("Item removed");
}

public Table getTable() {
    return this.table;
}

public boolean stopCellEditing() {
    return super.stopCellEditing();
}

protected void fireEditingStopped() {
    super.fireEditingStopped();
}
}

预收

Answer 1

okay, couldn t resist (the alternative is to scrub the bathroom :-)

下面是一份非常粗略的大纲(足以给你一个想法),说明如何用业绩良好的编辑和习惯表格解决你的目标。

MyTableModel is a custom implementation basically backed by a List of arbitrary entries
this tableModel supports removing/adding items. Privately for now, so you aren t tempted to call them from the editor :-) They are safe enough to expose with public scope, if needed, f.i. if other parts the program need to modify the entries as well
the model can handle different value types in setValueAt: a Modify marker, a NewEntry or a plain value
the custom editor is a panel with buttons to remove, add a row.
the actions of the button set the editorValue as appropriate before calling editingStopped/canceled as needed

模式:

public static class MyTableModel extends AbstractTableModel {

    public enum Modify {
        ADD,
        REMOVE
    }

    public static class NewItem {
        public final Object entry;

        public NewItem(Object entry) {
            this.entry = entry;
        }
    }

    private List entries;

    public MyTableModel(List entries) {
        this.entries = entries;
    }

    @Override
    public int getRowCount() {
        return entries.size();
    }

    @Override
    public int getColumnCount() {
        return 1;
    }


    @Override
    public boolean isCellEditable(int rowIndex, int columnIndex) {
        return true;
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        return entries.get(rowIndex);
    }

    @Override
    public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
        if (aValue instanceof NewItem) {
            addEntry(((NewItem) aValue).entry);
        } else if (Modify.REMOVE == aValue) {
            removeEntry(rowIndex);
        } else {
            entries.set(rowIndex, aValue);
        }    
    }

    private void removeEntry(int rowIndex) {
        entries.remove(rowIndex);
        fireTableRowsDeleted(rowIndex, rowIndex);
    }

    private void addEntry(Object aValue) {
        int last = getRowCount();
        entries.add(aValue);
        fireTableRowsInserted(last, last);
    }


}

编辑:

public static class MyCellEditor extends AbstractCellEditor implements TableCellEditor {

    private Object editorValue;
    private JLabel entryView;
    JComponent editor;

    public MyCellEditor() {
        editor = new JPanel();
        entryView = new JLabel();
        editor.add(entryView);
        Action add = createAddAction();
        editor.add(new JButton(add));
        Action remove = createRemoveAction();
        editor.add(new JButton(remove));
    }

    public Action createRemoveAction() {
        Action remove = new AbstractAction("Remove Entry") {

            @Override
            public void actionPerformed(ActionEvent e) {
                editorValue = MyTableModel.Modify.REMOVE;
                fireEditingStopped();
            }

        };
        return remove;
    }

    public Action createAddAction() {
        Action add = new AbstractAction("Add Entry") {

            @Override
            public void actionPerformed(ActionEvent e) {
                String input = JOptionPane.showInputDialog("Add entry: ");

                if ((input != null) && (input.length() > 0)) {
                    editorValue = new MyTableModel.NewItem(input);
                    fireEditingStopped();
                } else {
                    fireEditingCanceled();
                }

            }

        };
        return add;
    }

    @Override
    public Object getCellEditorValue() {
        return editorValue;
    }

    @Override
    public Component getTableCellEditorComponent(JTable table,
            Object value, boolean isSelected, int row, int column) {
        entryView.setText(value != null ? value.toString() : "");
        return editor;
    }


}

The usage:

    List entries = new ArrayList();
    for (int i = 0; i < 5; i++) {
        entries.add("entry " + i);
    }
    TableModel model = new MyTableModel(entries);
    JTable table = new JTable(model);
    table.getColumnModel().getColumn(0).setCellEditor(new MyCellEditor());
    table.getColumnModel().getColumn(0).setPreferredWidth(200);
    table.setRowHeight(50);

Answer 2

如果你重新使用“DefaultTableModel”,那么你就不得不删除模型本身所持有的价值,而不是用于建立模型的ArrayList的价值。您将采用以下方式这样做:setValueAt(......)s of the DefaultTableModel Object。

请设一个SSCCE,以提供更具体的帮助。

友情链接