Question

使用modify prepareRenderer实现JTable。

public class MyTable extends JTable {

    private List<Client> list;

    public MyTable(TableModel model){
        super(model);
        if (model instanceof ProfitAbilityTableModel){
            list=((ProfitAbilityTableModel)model).getClients();
        }       
    }
    @Override
    public Component prepareRenderer(TableCellRenderer renderer, int rowIndex, int vColIndex){
        Component rComp=super.prepareRenderer(renderer, rowIndex, vColIndex);
        if(list!=null){
            Client client=list.get(rowIndex);
            if(client.getExpected()==client.getReceived())
                rComp.setBackground(new Color(139, 255, 182));
            else
                rComp.setBackground(new Color(255,139,147));
        }

        return rComp;
    }
}

ProfitAbilityTableModel

public class ProfitAbilityTableModel  extends AbstractTableModel{

    private String []columnNames={"Имя учетной записи", "Ф.И.О. Клиента","Адрес",
            "Получено грн.", "Предпологалось грн."};
    private List<Client> clients;

    public ProfitAbilityTableModel(List<Client> clients){
        this.clients=clients;
    }

    public ProfitAbilityTableModel(){};

    @Override
    public int getColumnCount() {
        return 5;
    }

    @Override
    public int getRowCount() {
        return (clients!=null) ? clients.size(): 0;
    }

    @Override
    public Object getValueAt(int r, int c) {
        Client client=clients.get(r);
        switch (c) {
            case 0:
                return client.getUserName();
            case 1:
                return client.getName() +" " + client.getSurname() + " " + client.getPatronymic();
            case 2:
                return client.getAddress();
            case 3:
                return client.getReceived();
            case 4:
                return client.getExpected();    
            default:
                return null;
        }
    }

    @Override
    public String getColumnName(int c){
        return columnNames[c];
    }

    public List<Client> getClients() {
        return clients;
    }


}

在mainFrame中创建具有空tableModel的表 table = new MyTable（new ProfitAbilityTableModel（））;

按下按钮时执行此操作

button_1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                table.setModel(new ProfitAbilityTableModel(ClientFactory.getClients(10)));
            }
        });

其中ClientFactory：

public class ClientFactory {
    public static List<Client> getClients(int amount){
        List<Client> result=new ArrayList<>();
        Client c;
        int received,expected;
        for(int i=0;i<amount;i++){
            c=new Client();
            c.setUserName("username " + i);
            c.setName("name "+ i);
            c.setSurname("surname " + i);
            c.setPatronymic("patronymic" + i);
            c.setAddress("address " + i);
            expected=(int)(Math.random()*100);
            received=(int)(Math.random()*100);
            if(received>expected)
                received=expected;
            c.setExpected(expected);
            c.setReceived(received);
            result.add(c);
        }
        return result;
    }
}

如果Client的两个字段相等，则将其设为行的更改颜色。创建MyTable时它工作正常，但是当更改tableModel时，所有行都有默认的背景颜色（白色）。如何在更改表模型时调用此代码？

Answer 1

通过向ProfitAbilityTableModel添加此方法解决了问题：

public void setData(List<Client> clients){
        this.clients=clients;
    }

    public Client getClient(int index){
        return clients.get(index);
    }

改变我的表格：

public class MyTable extends JTable {

    public MyTable(TableModel model){
        super(model);   
    }
    @Override
    public Component prepareRenderer(TableCellRenderer renderer, int rowIndex, int vColIndex){
        Component rComp=super.prepareRenderer(renderer, rowIndex, vColIndex);
        if(getModel()!=null){
            Client client=((ProfitAbilityTableModel)getModel()).getClient(rowIndex);
            if(client.getExpected()==client.getReceived())
                rComp.setBackground(new Color(139, 255, 182));
            else
                rComp.setBackground(new Color(255,139,147));
        }

        return rComp;
    }
}

在主框架中通过按钮更新数据，如下所示：

ProfitAbilityTableModel model=(ProfitAbilityTableModel)table.getModel();
model.setData(ClientFactory.getClients(10));
model.fireTableDataChanged();

调用JTable Swing的prepareRenderer

1 个答案: