Question

我正在开发一个带有秋千的游戏大厅。我有一个JTable，所有不同的玩家都登录了房间，我只想在一个单元格中添加一个JComboBox。我的问题是comboBox无法正确呈现。

我知道与此主题相关的其他话题很多，但我找不到同样问题的人。

JComboBox box = new JComboBox();
box.addItem("Warrior");
/* Adds few other items (strings)*/
this.box.addActionListener (new ActionListener () {
    public void actionPerformed(ActionEvent e) {
        /* sends message to server to change character when the combobox's chosen element is changed*/
    }
});
TableUserModel model = new TableUserModel(localUser,this.box); //Specifying the local user as I don't want a JComboBox in the others user's rows.
JTable table = new JTable(this.model);
table.getColumnModel().getColumn(1).setCellEditor(new DefaultCellEditor(this.box));

表模型类

public class TableUserModel extends AbstractTableModel{

    private String[] columnNames = {"Username","Class","TeamColor","Action"};
    private Object[][] data = {{null,null,null,null}};
    private User localUser;
    private JComboBox box;

    public TableUserModel(User u,JComboBox box) {
        this.localUser = u;
        this.box = box;
    }

    @Override
    public int getColumnCount() {
        return this.columnNames.length;
    }

    @Override
    public int getRowCount() {
        return this.data.length;
    }

    @Override
    public Object getValueAt(int row, int col) {
        return this.data[row][col];
    }

    public String getColumnName(int col) {
        return columnNames[col];
    }

    public Class getColumnClass(int column) {
        for (int row = 0; row < getRowCount(); row++) {
            Object o = getValueAt(row, column);
            if (o != null) {
                return o.getClass();
            }
        }
        return Object.class;
    }

    //The following method updates my data array when the informations are refreshed from the server
    public void refreshUsers(ArrayList<User> users) {
        int elementNumber = 0;
        //clears the data[][] array
        this.data = new Object[][];
        for (User usr : users) {
            this.data[elementNumber][0] = usr.getUsername();
            /*if it's the GriffinBabe's (local user) row */
                this.data[elementNumber][1] = this.box; //HERE!!! I add the JComboBox into the specific cell
            /*else adds a simple string information (for users other than localplayer) */
            this.data[elementNumber][2] = usr.getTeamColor();
            this.data[elementNumber][3] = null;
            elementNumber++;
        }
    }

用户类别

只是一个包含一些信息的类，问题肯定不在这里

Answer 1

，我只想在一个单元格中添加一个JComboBox。

这与TableModel无关。显示编辑器的是视图（即表），因此您需要自定义表。

执行此操作的一种方法是覆盖getCellEditor(...)的{{1}}方法。例如：

JTable

在特定的JTable单元格中添加的JComboBox无法呈现

1 个答案: