我创建了一个 cellList ：当用户单击“发送”按钮时，我想添加一个点击处理程序
请帮忙。如果用户单击“发送”按钮，FieldUpdater 应该可以工作。
这是代码：
final String imageHtml =AbstractImagePrototype.create(images.contact()).getHTML();
// first make a list of HasCell type - MyClass is the type of object being displayed in the CellList (could be String for simple labels)
List<HasCell<contactinfo, ?>> hasCells = new ArrayList<HasCell<contactinfo, ?>>();
hasCells.add(new HasCell<contactinfo, String>()
{
public ButtonCell cell = new ButtonCell();
public Cell<String> getCell()
{
return cell;
}
@Override
public String getValue(contactinfo object)
{
return "Send";
}
@Override
public FieldUpdater<contactinfo, String> getFieldUpdater() {
FieldUpdater< contactinfo, String > updater= new FieldUpdater<contactinfo, String>() {
@Override
public void update(int index, contactinfo object, String value) {
Window.alert("You clicked "+object.getName());
}
};
return updater;
}
}
);
// now construct the actual composite cell using the list (hasCells)
Cell<contactinfo> myClassCell = new CompositeCell<contactinfo>(hasCells)
{
@Override
public void render(Context context, contactinfo value, SafeHtmlBuilder sb)
{
sb.appendHtmlConstant("<table><tbody><tr>");
super.render(context, value, sb);
sb.appendHtmlConstant("</tr></tbody></table>");
}
@Override
protected Element getContainerElement(Element parent)
{
// Return the first TR element in the table.
return parent.getFirstChildElement().getFirstChildElement();
}
@Override
protected <X> void render(Context context, contactinfo contactinfo, SafeHtmlBuilder sb, HasCell<contactinfo, X> hasCell)
{
这会将复合单元格内的每个单元格呈现在一个新的表格单元格中
// Value can be null, so do a null check..
if (contactinfo == null) {
return;
}
sb.appendHtmlConstant("<table>");
// Add the contact image.
sb.appendHtmlConstant("<tr><td rowspan='3'>");
sb.appendHtmlConstant(imageHtml);
sb.appendHtmlConstant("</td>");
// Add the name and address.
sb.appendHtmlConstant("<td style='font-size:95%;'>");
if(contactinfo.getName()!=null)
sb.appendEscaped(contactinfo.getName());
sb.appendHtmlConstant("</td></tr><tr><td>");
if(contactinfo.getAddress()!=null)
sb.appendEscaped(contactinfo.getRemarks());
sb.appendHtmlConstant("</td>");
Cell<X> cell = hasCell.getCell();
sb.appendHtmlConstant("<td>");
cell.render(context, hasCell.getValue(contactinfo), sb);
sb.appendHtmlConstant("</td></tr></table>");
}
};
// then make the actual cellList, passing the composite cell
cellList =new CellList<contactinfo>(myClassCell,KEY_PROVIDER);
// Add a selection model so we m select cells.
singleselectionModel = new SingleSelectionModel<contactinfo>(
KEY_PROVIDER);
cellList.setSelectionModel(singleselectionModel);
singleselectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() {
@Override
public void onSelectionChange(SelectionChangeEvent event) {
}
});