Java 如何使用 GWT 2.1 数据展示小部件
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时间：2020-08-13 14:08:54 来源:igfitidea点击:
How to use GWT 2.1 Data Presentation Widgets
提问by George Armhold
At the 2010 Google IO it was announced that GWT 2.1 would include new Data Presentation Widgets. 2.1M is available for download, and presumably the widgets are included, but no documentation has yet surfaced.
在 2010 年的 Google IO 上，宣布 GWT 2.1 将包含新的Data Presentation Widgets。2.1M 可供下载，并且可能包含小部件，但尚未出现任何文档。
Is there a short tutorial or example for how to use them? I've seen a rumor that CellListand CellTableare the classes in question. The Javadoc for them is riddled with lots of TODOs, so quite a bit is still missing in terms of usage.
是否有关于如何使用它们的简短教程或示例？我看到有传言说CellList和CellTable是有问题的类。他们的 Javadoc 充斥着许多 TODO，因此在使用方面仍然缺少很多。
采纳答案by antony.trupe
Google I/O 2010 - GWT's UI overhaul
javadocs package com.google.gwt.cell.client in 2.1
2.1 中的 javadocs 包 com.google.gwt.cell.client
Eclipse update site for milestone 2
While the code is in bikeshed, add this line to your gwt.xml file:
当代码在自行车棚中时，将此行添加到您的 gwt.xml 文件中：
<inherits name='com.google.gwt.requestfactory.RequestFactory'/>
The following examples follow:
以下示例如下：
- CellList of TextCells with PageSizePager
- CellList of TextCells with a SimplePager
- CellList of TextCells with a SimplePager and PageSizePager(buggy) and
- CellTable with String header and TextCell header
- 带有 PageSizePager 的 TextCells 的 CellList
- 带有 SimplePager 的 TextCell 的 CellList
- 带有 SimplePager 和 PageSizePager(buggy) 的 TextCell 的 CellList 和
- 带有 String 标题和 TextCell 标题的 CellTable
package dpw.client;
import java.util.ArrayList;
import com.google.gwt.cell.client.TextCell;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.cellview.client.CellList;
import com.google.gwt.user.cellview.client.CellTable;
import com.google.gwt.user.cellview.client.PageSizePager;
import com.google.gwt.user.cellview.client.SimplePager;
import com.google.gwt.user.cellview.client.TextColumn;
import com.google.gwt.user.cellview.client.Header;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.view.client.ListViewAdapter;
public class Index implements EntryPoint {
public void onModuleLoad() {
// create some data
ArrayList<String> values = new ArrayList<String>();
values.add("one");
values.add("two");
values.add("three");
values.add("four");
values.add("five");
values.add("six");
// create a ListViewAdapter
ListViewAdapter<String> lva = new ListViewAdapter<String>();
// give the ListViewAdapter our data
lva.setList(values);
{
// CellList of TextCells with PageSizePager
CellList<String> cl = new CellList<String>(new TextCell());
// set the initial pagesize to 2
cl.setPageSize(2);
// add the CellLists to the adaptor
lva.addView(cl);
// create a PageSizePager, giving it a handle to the CellList
PageSizePager<String> psp = new PageSizePager<String>(cl, 2);
// add the CellList to the page
RootPanel.get().add(cl);
// add the PageSizePager to the page
RootPanel.get().add(psp);
}
RootPanel.get().add(new HTML("<hr />"));
{
// CellList of TextCells with a SimplePager
CellList<String> cl = new CellList<String>(new TextCell());
// set the initial pageSize to 2
cl.setPageSize(2);
// add the CellLists to the adaptor
lva.addView(cl);
// create a pager, giving it a handle to the CellList
SimplePager<String> pager = new SimplePager<String>(cl,
SimplePager.TextLocation.CENTER);
// add the CellList to the page
RootPanel.get().add(cl);
// add the Pager to the page
RootPanel.get().add(pager);
}
RootPanel.get().add(new HTML("<hr />"));
{
// CellList of TextCells with a SimplePager and PageSizePager
CellList<String> cl = new CellList<String>(new TextCell());
// set the initial pageSize to 2
cl.setPageSize(2);
// add the CellLists to the adaptor
lva.addView(cl);
// create a PageSizePager, giving it a handle to the CellList
PageSizePager<String> psp = new PageSizePager<String>(cl, 1);
// create a pager, giving it a handle to the CellList
SimplePager<String> pager = new SimplePager<String>(cl,
SimplePager.TextLocation.CENTER);
// add the CellList to the page
RootPanel.get().add(cl);
// add the Pager to the page
RootPanel.get().add(pager);
// add the PageSizePager to the page
RootPanel.get().add(psp);
}
RootPanel.get().add(new HTML("<hr />"));
{
// CellTable
CellTable<String> ct = new CellTable<String>();
ct.setPageSize(2);
lva.addView(ct);
// add a column with a simple string header
ct.addColumn(new TextColumn<String>() {
@Override
public String getValue(String object) {
return object;
}
}, "String Header");
//add a column with a TextCell header
ct.addColumn(new TextColumn<String>() {
@Override
public String getValue(String object) {
return "%" + object + "%";
}
}, new Header<String>(new TextCell()) {
@Override
public String getValue() {
return "TextCell Header";
}
});
// create a pager, giving it a handle to the CellTable
SimplePager<String> pager = new SimplePager<String>(ct,
SimplePager.TextLocation.CENTER);
// add the CellList to the page
RootPanel.get().add(ct);
// add the Pager to the page
RootPanel.get().add(pager);
}
}
}
回答by Janak Kansal
To show multiple column in table you need to put array in list. The reference code to achieve this is:
要在表中显示多列，您需要将数组放入列表中。实现此目的的参考代码是：
package com.test.client;
import java.util.ArrayList;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.cellview.client.CellTable;
import com.google.gwt.user.cellview.client.SimplePager;
import com.google.gwt.user.cellview.client.TextColumn;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.view.client.ListViewAdapter;
import com.google.gwt.view.client.SingleSelectionModel;
public class Index implements EntryPoint {
public void onModuleLoad() {
// create some data
ArrayList<String[]> values = new ArrayList<String[]>();
values.add(new String[] { "1", "a" });
values.add(new String[] { "2", "b" });
values.add(new String[] { "3", "c" });
values.add(new String[] { "4", "d" });
values.add(new String[] { "5", "e" });
values.add(new String[] { "6", "f" });
values.add(new String[] { "7", "g" });
values.add(new String[] { "8", "h" });
values.add(new String[] { "9", "i" });
values.add(new String[] { "10", "j" });
// create a ListViewAdapter
ListViewAdapter<String[]> lva = new ListViewAdapter<String[]>();
// give the ListViewAdapter our data
lva.setList(values);
RootPanel.get().add(new HTML("<hr />"));
{
// CellTable
CellTable<String[]> ct = new CellTable<String[]>();
ct.setSelectionEnabled(true);
ct.setSelectionModel(new SingleSelectionModel());
ct.setPageSize(2);
lva.addView(ct);
ct.addColumn(new TextColumn<String[]>() {
@Override
public String getValue(String[] object) {
return object[0];
}
}, "First");
ct.addColumn(new TextColumn<String[]>() {
@Override
public String getValue(String[] object) {
return "%" + object[1] + "%";
}
}, "Second");
// create a pager, giving it a handle to the CellTable
SimplePager<String[]> pager = new SimplePager<String[]>(ct, SimplePager.TextLocation.CENTER);
// add the Pager to the page
RootPanel.get().add(pager);
// add the CellList to the page
RootPanel.get().add(ct);
}
}
}
回答by Andrew Chen
The following code is what I'm woking on, hope it'll be helpful:
以下代码是我正在研究的，希望它会有所帮助：
protected void init() {
VerticalPanel container = new VerticalPanel();
initWidget(container);
int pageSize = 10;
CellTable<User> cellTable = new CellTable<User>(pageSize);
setColumns(cellTable);
setSelectionModel(cellTable);
setDataSize(cellTable);
int pageStart = 0;
loadData(pageStart, pageSize, cellTable);
SimplePager<User> pager = createPager(cellTable);
container.add(cellTable);
container.add(pager);
}
private SimplePager<User> createPager(final CellTable<User> cellTable) {
SimplePager<User> pager = new SimplePager<User>(cellTable,
SimplePager.TextLocation.CENTER) {
public void onRangeOrSizeChanged(PagingListView<User> listView) {
loadData(listView.getPageStart(), listView.getPageSize(),
listView);
super.onRangeOrSizeChanged(listView);
}
};
return pager;
}
private void setColumns(CellTable<User> cellTable) {
cellTable.addColumn(new TextColumn<User>() {
@Override
public String getValue(User user) {
return user.getName();
}
}, new TextHeader("Name"));
cellTable.addColumn(new TextColumn<User>() {
@Override
public String getValue(User user) {
return user.getLocation();
}
}, new TextHeader("Location"));
}
private void setSelectionModel(CellTable<User> cellTable) {
final SingleSelectionModel<User> selectionModel = new SingleSelectionModel<User>();
SelectionChangeHandler selectionHandler = new SelectionChangeHandler() {
@Override
public void onSelectionChange(SelectionChangeEvent event) {
User user = selectionModel.getSelectedObject();
Window.alert(user.getId() + ": " + user.getName());
}
};
selectionModel.addSelectionChangeHandler(selectionHandler);
cellTable.setSelectionEnabled(true);
cellTable.setSelectionModel(selectionModel);
}
private void setDataSize(final PagingListView<User> cellTable) {
employeeRequest.countUsers(new AsyncCallback<Integer>() {
public void onFailure(Throwable caught) {
Window.alert("Request failure: " + caught.getMessage());
}
public void onSuccess(Integer result) {
cellTable.setDataSize(result, true);
}
});
}
private void loadData(int start, int size,
final PagingListView<User> cellTable) {
employeeRequest.getUsers(start, size,
new AsyncCallback<PagingData<User>>() {
public void onFailure(Throwable caught) {
Window.alert("Request failure: " + caught.getMessage());
}
public void onSuccess(PagingData<User> result) {
cellTable.setData(result.getStart(),
result.getLength(), result.getValues());
}
});
}
public class PagingData<T> implements IsSerializable {
private int start;
private int length;
private List<T> values;
public PagingData() {
}
public PagingData(int start, int length, List<T> values) {
super();
this.start = start;
this.length = length;
this.values = values;
}
public int getStart() {
return start;
}
public void setStart(int start) {
this.start = start;
}
public int getLength() {
return length;
}
public void setLength(int length) {
this.length = length;
}
public List<T> getValues() {
return values;
}
public void setValues(List<T> values) {
this.values = values;
}
}
回答by Piotr
You may want to take a look at Spring Roo project. Spring Roo in general is used to scaffold Java applications. In the newest version 1.1 it can also scaffold GWT applications (using many GWT 2.1 features).
您可能想看看 Spring Roo 项目。Spring Roo 通常用于构建 Java 应用程序。在最新的 1.1 版中，它还可以构建 GWT 应用程序（使用许多 GWT 2.1 功能）。
It can generate a lot of GWT 2.1 code for you and then you can see how everything works together. The information about Spring Roo is also given in GWT 2.1 release notes and the tool was presented in Google I/O Keynote (it is really interesting, the video can be found here).
它可以为您生成大量 GWT 2.1 代码，然后您可以看到所有内容如何协同工作。GWT 2.1 发行说明中也提供了有关 Spring Roo 的信息，并且该工具在 Google I/O Keynote 中进行了介绍（真的很有趣，可以在此处找到视频）。
Edit:
编辑：
There is even a complete example of GWT 2.1 application (Expenses application) in Spring Roo. To generate this application you only need to install Roo 1.1 and then execute this in roo console:
Spring Roo 中甚至还有一个完整的 GWT 2.1 应用程序示例（费用应用程序）。要生成此应用程序，您只需安装 Roo 1.1，然后在 roo 控制台中执行此操作：
script -f samples/expenses.roo
回答by Nicolas C
Great answer from antony.trupe above.
上面 antony.trupe 的好答案。
If you want to have an editable cell, you could add this piece of code to his class, and instanciate such a column instead of the regular TextColumn.
如果你想要一个可编辑的单元格，你可以将这段代码添加到他的类中，并实例化这样一个列而不是常规的TextColumn.
I'm sure you understand the FieldUpdaterpart. It's basically designed to update the underlying model -- which is not possible in the case of String.
我相信你明白这FieldUpdater部分。它基本上旨在更新底层模型——这在String.
I'll try to post a more complete example later on.
稍后我将尝试发布一个更完整的示例。
static class EditableColumn<T> extends Column<T, String> {
public EditableColumn()
{
super(new EditTextCell());
// workaround a NPE in EditTextCell.java:75
super.setFieldUpdater( new FieldUpdater<T, String>(){
@Override
public void update( int index, T object, String value ) {
// I think object should be updated with the new value, which cannot be done
// in a generic way (and cannot be done if T is String (immutable)).
// Doing nothing here will at least update the view (probably not the model)
System.out.println(index+":"+object+":"+value);
}
});
}
@Override
public String getValue(T object) {
return "%" + object + "%";
}
}
回答by Ashwin Prabhu
I have a working prototype of an editable CellTable. The prototype has a Table displaying String, Boolean, Date, Integer columns with editors for each. Editing each cell updates the corresponding model.
我有一个可编辑的 CellTable 的工作原型。原型有一个表，显示字符串、布尔值、日期、整数列，每个列都有编辑器。编辑每个单元格会更新相应的模型。
public class CellTableDemo implements EntryPoint
{
public void onModuleLoad( )
{
CellTable<SomeDTO> cellTable = createTable( );
addColumns( cellTable );
ListViewAdapter<SomeDTO> listViewAdapter = new ListViewAdapter<SomeDTO>( );
listViewAdapter.setList( getData( ) );
listViewAdapter.addView( cellTable );
RootPanel.get( ).add( new SimplePager<SomeDTO>( cellTable, SimplePager.TextLocation.CENTER ) );
RootPanel.get( ).add( cellTable );
}
private CellTable<SomeDTO> createTable( )
{
CellTable<SomeDTO> cellTable = new CellTable<SomeDTO>( );
cellTable.setSelectionEnabled( true );
cellTable.setSelectionModel( new SingleSelectionModel<SomeDTO>( ) );
cellTable.setPageSize( 5 );
cellTable.setPageStart( 0 );
return cellTable;
}
private void addColumns( CellTable<SomeDTO> cellTable )
{
Column<SomeDTO, String> colA = new Column<SomeDTO, String>( new TextInputCell( ) )
{
public String getValue( SomeDTO object )
{
return object.getA( );
}
};
colA.setFieldUpdater( new FieldUpdater<SomeDTO, String>( ) // updates changes into the backing bean
{
public void update( int index, SomeDTO object, String value )
{
object.setA( value );
}
} );
cellTable.addColumn( colA, "String Column A" );
cellTable.addColumn( new Column<SomeDTO, Integer>( new CurrencyCell( ) )
{
public Integer getValue( SomeDTO object )
{
return object.getB( );
}
}, "Currency Column B" );
Column<SomeDTO, Boolean> colC = new Column<SomeDTO, Boolean>( new CheckboxCell( ) )
{
public Boolean getValue( SomeDTO object )
{
return object.getC( );
}
};
colC.setFieldUpdater( new FieldUpdater<SomeDTO, Boolean>( )
{
public void update( int index, SomeDTO object, Boolean value )
{
object.setC( value );
}
} );
cellTable.addColumn( colC, "Boolean Column C" );
Column<SomeDTO, Date> colD = new Column<SomeDTO, Date>( new DatePickerCell( ) )
{
public Date getValue( SomeDTO object )
{
return object.getD( );
}
};
colD.setFieldUpdater( new FieldUpdater<SomeDTO, Date>( )
{
public void update( int index, SomeDTO object, Date value )
{
object.setD( value );
}
} );
cellTable.addColumn( colD, "Date Column D" );
cellTable.addColumn( new Column<SomeDTO, String>( new ActionCell<String>( "Click of summary of this row", new Delegate<String>( )
{
public void execute( String row )
{
Window.alert( row );
}
} ) )
{
public String getValue( SomeDTO row )
{
return row.getSummary( );
}
} );
}
private ArrayList<SomeDTO> getData( )
{
ArrayList<SomeDTO> tableData = new ArrayList<SomeDTO>( );
tableData.add( new SomeDTO( "A", 10, true, new Date( ) ) );
tableData.add( new SomeDTO( "AA", 200, false, new Date( ) ) );
tableData.add( new SomeDTO( "AAA", 3000, true, new Date( ) ) );
tableData.add( new SomeDTO( "AAAA", 40, false, new Date( ) ) );
tableData.add( new SomeDTO( "AAAAA", 500, true, new Date( ) ) );
tableData.add( new SomeDTO( "AAAAAA", 6000, false, new Date( ) ) );
tableData.add( new SomeDTO( "AAAAAAA", 70, true, new Date( ) ) );
tableData.add( new SomeDTO( "AAAAAAAA", 800, false, new Date( ) ) );
tableData.add( new SomeDTO( "AAAAAAAAA", 9000, true, new Date( ) ) );
tableData.add( new SomeDTO( "AAAAAAAAAA", 10, false, new Date( ) ) );
tableData.add( new SomeDTO( "AAAAAAAAAAA", 11, true, new Date( ) ) );
return tableData;
}
public class SomeDTO
{
private String a;
private Integer b;
private Boolean c;
private Date d;
public SomeDTO( String a, Integer b, Boolean c, Date d )
{
this.a = a;
this.b = b;
this.c = c;
this.d = d;
}
public String getA( )
{
return a;
}
public void setA( String a )
{
this.a = a;
}
public Integer getB( )
{
return b;
}
public void setB( Integer b )
{
this.b = b;
}
public Boolean getC( )
{
return c;
}
public void setC( Boolean c )
{
this.c = c;
}
public Date getD( )
{
return d;
}
public void setD( Date d )
{
this.d = d;
}
public String getSummary( )
{
return getA( ) + " " + getB( ) + " " + getC( ) + " " + getD( );
}
}
}
