java - 自定义单元格渲染器

Question

是否可以创建自定义单元格渲染器的实例，并根据给定的参数为每列放入不同的值？

例如:

我有这个渲染器(MyCustomCellRenderer myRen = new MyCustomCellRenderer)，并且对于每一列，我都放置了不同的参数以在ComboBox中显示不同的内容:

MyCustomCellRenderer myRen = new MyCustomCellRenderer
for (int i = 0; i < table.nbColumns; i++) {
  myRen.setArg(myArg); //denpending on this argument I fill the combo
  myJTable.getColumnModel().getColumn(i).setCellRenderer(myRen);
}

我该怎么做？

编辑:

看起来有一个误解，我有我的参数列表，并且我编写了上面的代码作为示例。

我的问题是:我应该在 MyCustomCellRenderer 类中编写什么以使渲染器每次针对每列进行更改？
我的渲染器类:

public class MyCustomCellRenderer extends JPanel{
    private static final long serialVersionUID = 1L;

    private JPanel topPanel;
    private JTextField hs = new JTextField();
    private Activity aObj = new Activity();
    @SuppressWarnings({ "unchecked", "rawtypes" })
    private JComboBox<ComboItem> activityCombo = new JComboBox(aObj.getListActivitiesForComboBox());
    private JComboBox<ComboItem> chantier = new JComboBox<ComboItem>();
    private List<Project> listProjectsForChef;
    private List<Date> datePointage = new ArrayList<Date>();
    private Date columnDate;


    public MyCustomCellRenderer(boolean enabled, int idChef) {

        this.setLayout(new BorderLayout());
        if (enabled) {
            Project p = new Project();
            p.setChef(idChef);
            listProjectsForChef = p.getListProjectsForSelectedChef();                           
            topPanel = new JPanel();
            Color color = new Color(128, 128, 128);
            chantier.setBorder(BorderFactory.createLineBorder(Color.WHITE));
            chantier.setPreferredSize(new Dimension(this.getWidth(), 30));
            Services.setSideBorderColor(chantier, "TOP", color);
            this.add(chantier, BorderLayout.SOUTH);
            topPanel.setLayout(new GridLayout());

            hs.setBorder(BorderFactory.createLineBorder(Color.WHITE));
            hs.setHorizontalAlignment(JTextField.CENTER);
            Services.setSideBorderColor(hs, "RIGHT", color);
            hs.setPreferredSize(new Dimension(topPanel.getWidth(), topPanel.getHeight()));
            topPanel.add(hs);
            topPanel.add(activityCombo);
            this.add(topPanel, BorderLayout.CENTER);
        }
    }
    //The function that will take the argument
    public void setDatePointage(Date d){
        this.datePointage.add(d);
        this.columnDate = d;
        fillProjectCombobox();//--fill the combo based on the given argument
    }

    public void fillProjectCombobox() {  
        this.chantier.removeAllItems();
        int nbIde = listProjectsForChef.size();
        for (int i = 0; i < nbIde; i++) {
            String key = Integer.toString(listProjectsForChef.get(i).getId());
            String value = listProjectsForChef.get(i).getDesignation();
            java.sql.Date dateEndMappingChiefProject =  listProjectsForChef.get(i).getDateFin();
            if(dateEndMappingChiefProject != null){
                int compare = dateEndMappingChiefProject.compareTo(this.columnDate);
                if(compare == 1){//---dateEndMappingChiefProject > this.columnDate
                    this.chantier.addItem(new ComboItem(key, value));// ---on ajout les
                }
            }else{
                this.chantier.addItem(new ComboItem(key, value));// ---on ajout les
            }

        }
    }
}

Answer 1

您的问题是，您对所有列使用相同的 MyCustomCellRender 实例。这将导致每一列使用相同的渲染器，并以最后一个 myArg 作为参数来渲染您的内容。可能有帮助的是为每列创建一个新的 MyCustomCellRenderer 实例。

例如:

for (int i = 0; i < table.nbColumns; i++) {
    MyCustomCellRenderer myRen = new MyCustomCellRenderer //now each column will use it's own renderer instance
    //also: don't forget to set myArg
    myRen.setArg(myArg);
    myJTable.getColumnModel().getColumn(i).setCellRenderer(myRen);
}