问题:正确加载表单,ParentEditor,子编辑器,ThisEditor 弹出其所有字段,包括列表框(下拉列表)小部件,MyWidget。但是,如果我在列表框中选择一个新选项并保存,则它不会保存新选择的选项;虽然对其他小部件的编辑保存得很好。看来在驱动程序刷新时,编辑器没有获取listBox中的值。在调试模式下,在driver.edit上,我可以在包括列表框在内的所有表单小部件上看到TakesValueEditor调用setValue(value)。但是在flush上,我可以看到TakesValueEditor在其他窗体小部件上调用它的getValue()但是 不在我的列表框上。
编辑器层次结构:ParentEditor> ThisEditor>进myWidget。 ParentEditor是整个表单。 ThisEditor是表单的子部分。 MyWidget是ThisEditor部分中的自定义列表框。
我使用的是MVP模式。以下是View and Presenter的示例代码片段:
VIEW:
/** ThisEditor is a sub-section of ParentEditor (the Form) and contains a
MyWidget (custom listbox). */
public class ThisEditor extends Composite implements Editor<ThisProxy>, ThisView {
... //rfeDriver interface defined and created here
@UiField
MyWidget my; //getMy and setMy methods in ThisProxy
... //other field declarations
public ThisEditor() {
initWidget(binder.createAndBindUi(this));
}
@Override
public MyView getMy() {
return my;
}
... //other methods
}
/** This is the View interface that MyWidget implements */
public interface MyView extends HasOptions, HasValue<MyProxy>, Focusable {
interface Presenter {
...
}
...
}
public class MyWidget extends Composite implements MyView,
IsEditor<LeafValueEditor<MyProxy>> {
...
@UiField
ListBox listBox; //single-select dropdown
...
public MyWidget() {
initWidget(binder.createAndBindUi(this));
addChangeHandler(); //listen to changes to listBox and setSelectedIndex (?)
}
...
@Override
public int getSelectedIndex() {
return listBox.getSelectedIndex();
}
@Override
public void setSelectedIndex(int index) {
listBox.setSelectedIndex(index);
}
...
/**
* Called by the TakesValueEditor on rfeDriver.edit.
*/
@Override
public MyProxy getValue() {
//ask presenter for the MyProxy object -- presenter calls
//getSelectedIndex() on this widget and returns the object associated
//with the index
return presenter.getValue();
}
/**
* Called by the TakesValueEditor on rfeDriver.flush.
*/
@Override
public void setValue(MyProxy value) {
//pass the value to the presenter to parse and set the index that corresponds
//to this object
presenter.setValue(value);
}
PRESENTER
public class MyPresenter implements MyView.Presenter,
ValueLookupCompleteEventHandler {
...
protected HasOptions view;
private List<MyProxy> myList;
public MyPresenter(ParentPresenter parent) {
//setParent for this child presenter
}
... //methods to set view and create association between view and presenter
@Override
public MyProxy getValue() {
//identify the current selection
String selectedId = view.getValue(view.getSelectedIndex());
if (selectedId != null) {
//iterate myList to find the MyProxy object whose id.equals(selectedId)
for (Iterator<MyProxy> i = myList.iterator(); i.hasNext();) {
MyProxy value = i.next();
if (selectedId.equals(value.getCode().toString())) {
return value;
}
}
}
return null;
}
@Override
public void setValue(MyProxy value) {
//handle null value
String selectedId = value.getCode().toString();
... //verify the value is in myList
//traverse dropdown list and set selected index corresponding to value object
for (int i = 0; i < view.getItemCount(); ++i) {
if (selectedId.equals(view.getValue(i))) {
view.setSelectedIndex(i);
}
}
}
}
答案 0 :(得分:1)
我刚遇到同样的问题。如果你查看GWT ListBox的源代码,你会发现它没有实现isEditor。我实际上并不认为它是GWT编辑器组件。很难明白。我不得不围绕它编码。