Question

添加了对象，但它们未显示在表格中。并且分配了表中这两个添加对象的位置，但所有单元格都是空的。

并且有人可以建议关于NatTable的好文档，或者关于NatTable的精心编写的来源吗？

    ArrayList<Student> students = new ArrayList<>();

    final ColumnGroupModel columnGroupModel = new ColumnGroupModel();
    ColumnHeaderLayer columnHeaderLayer;

    students.add(new Student("Andrey","1", new Exam("Math", 4)));
    students.add(new Student("John","2", new Exam("Physics", 5)));
    String[] propertyNames = { "Full Name", "Group", "Name", "Mark" };
    DefaultBodyDataProvider<Student> bodyDataProvider = new DefaultBodyDataProvider<Student>(students, propertyNames);
    ColumnGroupBodyLayerStack bodyLayer = new ColumnGroupBodyLayerStack(new DataLayer(bodyDataProvider), columnGroupModel);

    DefaultColumnHeaderDataProvider defaultColumnHeaderDataProvider = new DefaultColumnHeaderDataProvider(propertyNames);
    DefaultColumnHeaderDataLayer columnHeaderDataLayer = new DefaultColumnHeaderDataLayer(defaultColumnHeaderDataProvider);
    columnHeaderLayer = new ColumnHeaderLayer(columnHeaderDataLayer, bodyLayer, bodyLayer.getSelectionLayer());
    ColumnGroupHeaderLayer columnGroupHeaderLayer = new ColumnGroupHeaderLayer(columnHeaderLayer, bodyLayer.getSelectionLayer(), columnGroupModel);

    columnGroupHeaderLayer.addColumnsIndexesToGroup("Exams", 2, 3);
    columnGroupHeaderLayer.setGroupUnbreakable(2);

    final DefaultRowHeaderDataProvider rowHeaderDataProvider = new DefaultRowHeaderDataProvider(bodyDataProvider);
    DefaultRowHeaderDataLayer rowHeaderDataLayer = new DefaultRowHeaderDataLayer(rowHeaderDataProvider);
    ILayer rowHeaderLayer = new RowHeaderLayer(rowHeaderDataLayer, bodyLayer, bodyLayer.getSelectionLayer());

    final DefaultCornerDataProvider cornerDataProvider = new DefaultCornerDataProvider(defaultColumnHeaderDataProvider, rowHeaderDataProvider);
    DataLayer cornerDataLayer = new DataLayer(cornerDataProvider);
    ILayer cornerLayer = new CornerLayer(cornerDataLayer, rowHeaderLayer, columnGroupHeaderLayer);

    GridLayer gridLayer = new GridLayer(
            bodyLayer,
            columnGroupHeaderLayer,
            rowHeaderLayer,
            cornerLayer);

    NatTable table = new NatTable(shell, gridLayer, false);
    table.configure();

班级学生和考试

class Student {
   String name;
   String groupNumber;
   Exam exam = new Exam();

   public Student() { }

   public Student(String name, String groupNumber, Exam exam) {
    super();
    this.name = name;
    this.groupNumber = groupNumber;
    this.exam = exam;
   }
}

class Exam {
  String name;
  int mark;

  public Exam() { }

  public Exam(String name, int mark) {
    super();
    this.name = name;
    this.mark = mark;
  }
}

Answer 1

您可以在没有默认配置的情况下创建NatTable实例。因此没有配置画家

在这里查看我们的入门教程：http://www.vogella.com/tutorials/NatTable/article.html

Answer 2

替代

NatTable table = new NatTable(shell, gridLayer, false);
table.configure();

与

NatTable table = new NatTable(shell, gridLayer, true);

所以表自动配置，否则你必须自己指定配置。

DefaultBodyDataProvider使用反射从指定的类中获取数据，因此Student必须是正确的bean类，因此它必须是public并且必须具有getter对于它的属性。如果您还想检索Exam属性，可以在“学生”中为他们创建获取者：

public class Student {
    String name;
    String groupNumber;
    Exam exam = new Exam();

    public Student() {
    }

    public Student(String name, String groupNumber, Exam exam) {
        super();
        this.name = name;
        this.groupNumber = groupNumber;
        this.exam = exam;
    }

    public String getName() {
        return name;
    }

    public String getGroupNumber() {
        return groupNumber;
    }

    public Exam getExam() {
        return exam;
    }

    public String getExamName() {
        return exam.getName();
    }

    public int getExamMark() {
        return exam.getMark();
    }

}

public class Exam {
    String name;
    int mark;

    public Exam() {
    }

    public Exam(String name, int mark) {
        super();
        this.name = name;
        this.mark = mark;
    }

    public String getName() {
        return name;
    }

    public int getMark() {
        return mark;
    }
}

propertyNames应该包含Student中变量的实际名称，因为它们用于通过反射检索getter，例如：

String[] propertyNames = { "name", "groupNumber", "examName", "examMark" };

如果要更改列中的标签，可以创建一个地图，将属性名称与所需标签链接，并将其传递给列标题：

Map<String, String> propertyToLabelMap = new HashMap<String, String>();
propertyToLabelMap.put("name", "Full Name");
propertyToLabelMap.put("groupNumber", "Group");
propertyToLabelMap.put("examName", "Name");
propertyToLabelMap.put("examMark", "Mark");

...

DefaultColumnHeaderDataProvider defaultColumnHeaderDataProvider = new DefaultColumnHeaderDataProvider(propertyNames, propertyToLabelMap);

不显示NatTable中的数据

2 个答案: