我在String[][]
a 中显示一个大数组FlexTable
,但速度很慢。如何在CellTable
or中显示数组DataGrid
?
示例显示CellTable< some class>
,但我只想要类似CellTable< String>
, CellTable< String[]>
, CellTable< List< String> >
.
我在String[][]
a 中显示一个大数组FlexTable
,但速度很慢。如何在CellTable
or中显示数组DataGrid
?
示例显示CellTable< some class>
,但我只想要类似CellTable< String>
, CellTable< String[]>
, CellTable< List< String> >
.
我通过修改 Google 的 ListDataProviderExample 以使用 CellTable 解决了这个问题。由于在编译时不知道列的数量,我使用了 Thomas Broyer 的 IndexedColumn 类(动态创建 GWT CellTable),正如 Juan Pablo Gardella 所提到的(https://groups.google.com/forum/?fromgroups=# !topic/google-web-toolkit/v6vZT0eUQKU)。这是我的测试代码:
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);
}
}