gwt - celltable - 添加额外的行

Question

在此处输入代码我有一个单元格表，列中包含一些数字。我想在表的末尾添加一个额外的行，它将保存每列的总数。有没有办法做到这一点？

以下是我的代码：

   import java.util.*;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.cellview.client.CellTable;
import com.google.gwt.user.cellview.client.TextColumn;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.view.client.ListDataProvider;

public class TestProject implements EntryPoint 
{

 private static int totalSalary=0;
 private static class Contact 
 {
        private final String salary;
        private final String name;

        public Contact(String name, String salary) 
        {
          this.name = name;
          this.salary = salary;
        }
 }

private static List<Contact> CONTACTS = Arrays.asList(new Contact("John","100000"), 
                                                      new Contact("Mary", "200000"), 
                                                      new Contact("Zander", "300000"));
/**
 * This is the entry point method.
 */
public void onModuleLoad() 
{
    final CellTable<Contact> table = new CellTable<Contact>();

    // Create name column.
    TextColumn<Contact> nameColumn = new TextColumn<Contact>() 
    {
      @Override
      public String getValue(Contact contact) 
      {
        return contact.name;
      }
    };

    // Create address column.
    TextColumn<Contact> addressColumn = new TextColumn<Contact>() 
    {
      @Override
      public String getValue(Contact contact) 
      {
        totalSalary+=Integer.parseInt(contact.salary);
        return contact.salary;
      }
    };

    // Add the columns.
    table.addColumn(nameColumn, "Name");
    table.addColumn(addressColumn, "Salary");

    // Create a data provider.
    ListDataProvider<Contact> dataProvider = new ListDataProvider<Contact>();

    // Connect the table to the data provider.
    dataProvider.addDataDisplay(table);

    // Add the data to the data provider, which automatically pushes it to the
    // widget.
    final List<Contact> list = dataProvider.getList();
    for (Contact contact : CONTACTS) {
      list.add(contact);
    }

    // We know that the data is sorted alphabetically by default.
    table.getColumnSortList().push(nameColumn);

    Contact total = new Contact("Total: ",totalSalary+"");
    list.add(total);



    // Add it to the root panel.
    RootPanel.get().add(table);
    //RootPanel.get().add(add);
}

}

Answer 1

另外，我建议您在添加列时使用 footer-Argument： addColumn(Column col, Header header)

Answer 2

当您的意思是总计时，我不太清楚您的意思，但这与您的代码相似，但我添加了一个按钮，可以添加行，但您可以将其取出并添加行。

/**
 * Entry point classes define <code>onModuleLoad()</code>.
 */
public class TestGwt implements EntryPoint {

     private static class Contact {
            private final String address;
            private final String name;

            public Contact(String name, String address) {
              this.name = name;
              this.address = address;
            }
          }

    private static List<Contact> CONTACTS = Arrays.asList(new Contact("John",
    "123 Fourth Road"), new Contact("Mary", "222 Lancer Lane"), new Contact(
    "Zander", "94 Road Street"));
    /**
     * This is the entry point method.
     */
    public void onModuleLoad() {
         // Create a CellTable.
        final CellTable<Contact> table = new CellTable<Contact>();

        // Create name column.
        TextColumn<Contact> nameColumn = new TextColumn<Contact>() {
          @Override
          public String getValue(Contact contact) {
            return contact.name;
          }
        };

        // Make the name column sortable.
        nameColumn.setSortable(true);

        // Create address column.
        TextColumn<Contact> addressColumn = new TextColumn<Contact>() {
          @Override
          public String getValue(Contact contact) {
            return contact.address;
          }
        };

        // Add the columns.
        table.addColumn(nameColumn, "Name");
        table.addColumn(addressColumn, "Address");

        // Create a data provider.
        ListDataProvider<Contact> dataProvider = new ListDataProvider<Contact>();

        // Connect the table to the data provider.
        dataProvider.addDataDisplay(table);

        // Add the data to the data provider, which automatically pushes it to the
        // widget.
        final List<Contact> list = dataProvider.getList();
        for (Contact contact : CONTACTS) {
          list.add(contact);
        }

        // We know that the data is sorted alphabetically by default.
        table.getColumnSortList().push(nameColumn);

        Button add = new Button("Add Row");
        add.addClickHandler(new ClickHandler() {

            @Override
            public void onClick(ClickEvent event) {
                list.add(new Contact(Integer.toString(table.getRowCount()),Integer.toString(table.getRowCount())));
            }
        });


        // Add it to the root panel.
        RootPanel.get().add(table);
        RootPanel.get().add(add);

      }



}

希望这将有助于我不确定您所说的总计是什么意思，尽管任何东西都可以以联系人的名义添加到最后一个字段中，即使它不一定是一个，更好的方法是使用泛型作为数据提供者但这将以最少的代码实现相同的效果

Answer 3

public void addNewRow(){                

    List<Contact> newContactLst = Arrays.asList(new Contact("TEST",
              "Sample"));

    int numRows = table.getRowCount();

    table.setRowCount(numRows+1);

    table.setRowData(numRows,newContactLst);

}