CompositeCell讓我們使用Java自定義GWT中表格單元格的內容。我們可以將幾乎任何其他組件放在表格的單元格中,並按照我們的需要進行佈局。問題是,如果我們使用html標記將CompositeCell的佈局定義爲另一個表(請參見CompositeCell匿名類實現下圖),我們將丟棄單元組件的事件處理:(。GWT:複合單元格中的處理事件
運行以下代碼,當我們點擊單元格的按鈕時,會實現對事件處理響應的彈出窗口如果我們評論CompositeCell的匿名實現,我們將調用CompositeCell.onBrowserEvent(Context,Element,C,NativeEvent,ValueUpdater ),因爲我認爲使用HTML表格標籤的單元格佈局的定義打破了GWT小部件層次結構中的事件鏈,但迄今爲止尚未成功。
備註:代碼的註釋和未註釋版本都實現了相同的GUI佈局。這個例子只是爲了表明我們在定製單元格的內容時放鬆事件處理。
public class ActionCellTest implements EntryPoint {
private static final String SERVER_ERROR = "An error occurred while " + "attempting to contact the server. Please check your network "
+ "connection and try again.";
private final GreetingServiceAsync greetingService = GWT.create(GreetingService.class);
public void onModuleLoad() {
CellTable<Person> table = new CellTable<ActionCellTest.Person>();
final List<HasCell<Person, ?>> cells = new LinkedList<HasCell<Person, ?>>();
cells.add(new HasCellImpl("first name", new ActionCell.Delegate<Person>() {
@Override
public void execute(Person object) {
Window.alert(object.getFirstName());
}
}));
cells.add(new HasCellImpl("last name", new ActionCell.Delegate<ActionCellTest.Person>() {
@Override
public void execute(Person object) {
Window.alert(object.getLastName());
}
}));
CompositeCell<Person> cell = new CompositeCell<Person>(cells) {
@Override
public void render(Context context, Person value, SafeHtmlBuilder sb) {
sb.appendHtmlConstant("<table><tbody><tr>");
for (HasCell<Person, ?> hasCell : cells) {
render(context, value, sb, hasCell);
}
sb.appendHtmlConstant("</tr></tbody></table>");
}
@Override
protected <X> void render(Context context, Person value, SafeHtmlBuilder sb, HasCell<Person, X> hasCell) {
Cell<X> cell = hasCell.getCell();
sb.appendHtmlConstant("<td>");
cell.render(context, hasCell.getValue(value), sb);
sb.appendHtmlConstant("</td>");
}
@Override
protected Element getContainerElement(Element parent) {
return parent.getFirstChildElement().getFirstChildElement().getFirstChildElement();
}
};
table.addColumn(new TextColumn<ActionCellTest.Person>() {
@Override
public String getValue(ActionCellTest.Person object) {
return object.getFirstName() + " " + object.getLastName();
}
}, "name");
table.addColumn(new Column<Person, Person>(cell) {
@Override
public Person getValue(ActionCellTest.Person object) {
return object;
}
}, "composite");
LinkedList<Person> data = new LinkedList<ActionCellTest.Person>();
data.add(new Person("Amy", "Reed"));
data.add(new Person("Tim", "Gardner"));
table.setRowData(data);
RootPanel.get().add(table);
}
private class HasCellImpl implements HasCell<Person, Person> {
private ActionCell<Person> fCell;
public HasCellImpl(String text, Delegate<Person> delegate) {
fCell = new ActionCell<Person>(text, delegate);
}
@Override
public Cell<Person> getCell() {
return fCell;
}
@Override
public FieldUpdater<Person, Person> getFieldUpdater() {
return null;
}
@Override
public Person getValue(Person object) {
return object;
}
}
private class Person {
private String fFirstName;
private String fLastName;
public Person(String first, String last) {
fFirstName = first;
fLastName = last;
}
public String getFirstName() {
return fFirstName;
}
public String getLastName() {
return fLastName;
}
}
}
我用....複製CompositeCell.java的所有soruces和自定義,因爲我想和創建爲'CustomCompositeCell celll = new ...'。對不起,我noob的主意,但它的工作原理:D – Cataclysm
我現在使用gwt2.5,但仍然出現錯誤。 – Cataclysm