GWT - 如何显示的String [] []在CellTable数组或数据网格

Question

我在FlexTable显示大量String[][]阵列，但它是非常缓慢的。 如何在CellTable或DataGrid中显示阵列？

示例显示CellTable< some class>但我只想要类似CellTable< String>,CellTable< String[]>,CellTable< List< String> >。

Answer 1

我通过修改谷歌的ListDataProviderExample使用CellTable解决的问题。由于在编译时不知道列的数量，因此我使用了由Juan Pablo Gardella（https://groups.google.com/forum/?fromgroups=#!topic/google-web-toolkit/v6vZT0eUQKU）提及的Thomas Broyer的IndexedColumn类（Create GWT CellTable Dynamically）。这里是我的测试代码：

package com.google.gwt.examples.view.client; 

import com.google.gwt.cell.client.TextCell; 
import com.google.gwt.core.client.EntryPoint; 
import com.google.gwt.user.cellview.client.CellTable; 
import com.google.gwt.user.cellview.client.Column; 
import com.google.gwt.user.cellview.client.TextHeader; 
import com.google.gwt.user.client.ui.RootPanel; 
import com.google.gwt.user.client.ui.VerticalPanel; 
import com.google.gwt.view.client.ListDataProvider; 

import java.util.ArrayList; 
import java.util.Arrays; 
import java.util.List; 

public class ListDataProviderExample implements EntryPoint { 

    String[][] rowsA = {{"aaaaa","bbbbb","ccccc"}, 
    {"111", "222", "333"}, {"A", "B", "C"}}; 

    public void onModuleLoad() { 
    // Create a CellTable. 
    CellTable<List<String>> table = new CellTable<List<String>>(); 

    // Get the rows as List 
    int nrows = rowsA.length; 
    int ncols = rowsA[0].length; 
    ArrayList rowsL = new ArrayList(nrows); 
    //List rowsL = new ArrayList(nrows); 
    for (int irow = 0; irow < nrows; irow++) { 
     List<String> rowL = Arrays.asList(rowsA[irow]); 
     rowsL.add(rowL); 
    } 

    // Create table columns 
    for (int icol = 0; icol < ncols; icol++) { 
     table.addColumn(new IndexedColumn(icol), 
       new TextHeader(rowsA[0][icol])); 
    } 

    // Create a list data provider. 
    final ListDataProvider<List<String>> dataProvider 
     = new ListDataProvider<List<String>>(rowsL); 

    // Add the table to the dataProvider. 
    dataProvider.addDataDisplay(table); 

    // Add the widgets to the root panel. 
    VerticalPanel vPanel = new VerticalPanel(); 
    vPanel.add(table); 
    RootPanel.get().add(vPanel); 
    } 
} 

class IndexedColumn extends Column<List<String>, String> { 
    private final int index; 
    public IndexedColumn(int index) { 
     super(new TextCell()); 
     this.index = index; 
    } 
    @Override 
    public String getValue(List<String> object) { 
     return object.get(this.index); 
    } 
}