带有 HasValue 和 @UiTemplate 的 GWT 列表框
我正在尝试使用 ListBox 实现 HasValue 接口，我从以下链接获取了代码/想法，并制作了自己的列表框类
http://turbomanage.wordpress.com/2010/04/01/selectonelistbox- for-use-with-gwtmvp/
现在的问题是我在视图中使用 @UiTemplate 并且我发现很难将 ListBox 转换为这个新的列表框。
我的视图类代码：
// defines List Box , so it get attached with UiTemplate
@UiField ListBox countryListBox ;
//-- this function should get the list box, i call this in presenter...
//-- now the problem is i do not know how i take this listbox back as selectOneListBox
public HasSelectedValue <T> getCountry() {
// TODO Auto-generated method stub
//return desTextBox;
SelectOneListBox<T> sel = new SelectOneListBox<T>(null);
sel =(SelectOneListBox<T>) countryListBox;
//return (SelectOneListBox<T>) countryListBox;
return sel;
//return countryListBox ;
}
I am trying to use ListBox with HasValue interface implemented, I got code / idea from the following link and I made the my own list box class
http://turbomanage.wordpress.com/2010/04/01/selectonelistbox-for-use-with-gwtmvp/
Now the problem is I am using @UiTemplate in my Views and I am finding it difficult to cast ListBox to this new ListBox.
My View class code:
// defines List Box , so it get attached with UiTemplate
@UiField ListBox countryListBox ;
//-- this function should get the list box, i call this in presenter...
//-- now the problem is i do not know how i take this listbox back as selectOneListBox
public HasSelectedValue <T> getCountry() {
// TODO Auto-generated method stub
//return desTextBox;
SelectOneListBox<T> sel = new SelectOneListBox<T>(null);
sel =(SelectOneListBox<T>) countryListBox;
//return (SelectOneListBox<T>) countryListBox;
return sel;
//return countryListBox ;
}
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评论（1）
您无法将
ListBox转换为SelectOneListBox（“这个新的ListBox”），因为ListBox不是SelectOneListBox的实现代码>SelectOneListBox。除非您引用了ListBox，但实际上您将SelectOneListBox保留在其中。不过我对此表示怀疑，因为那样你的代码应该可以工作。如果您想帮助我们帮助您，请向我们展示一些代码。
You cannot cast
ListBoxtoSelectOneListBox("this newListBox"), becauseListBoxis not an implementation ofSelectOneListBox. Unlsee you have reference toListBox, but in fact you keepSelectOneListBoxin it. However I doubt it, because then your code should work.Show us some code if you want to help us help you.