On Friday, January 13, 2012 9:05:22 AM UTC+1, Qrunk wrote:
>
> Hi ,
>
> Im a bit confused as in what does UI handling is meant in
> http://code.google.com/webtoolkit/articles/mvp-architecture.html, which
> is to be handled by the presenter.
>
First: skip directly to the "part 2" article.
Say I have a case where when I change my combo box , I want a UI
> widget(Text Box ) to be disabled. Now here there are two things:
>
> 1. I have to check through the data which I clicked inside the combo Box,
> which I believe should make my event to be handled by the presenter as my
> UI shouldn't be aware of my data part(Models)
>
"my UI shouldn't be aware of my data part" is an anti-pattern; it implies
too much abstractions, and leads to over-engineered and hard to maintain
code.
> 2. As i want to make an UI related change in my page, this event should be
> handled by the View class.
>
Because it's related to your "presentation logic", it should go through to
the presenter.
interface Presenter {
void onSelectedXxxChanged(Xxx selectedItem);
}
interface View {
void setYyyEnabled(boolean enabled);
}
Then in your presenter:
@Override
public void onSelectedXxxChanged(Xxx selectedItem) {
boolean enabled = shouldEnableYyy(selectedItem); // your logic
view.setYyyEnabled(enabled);
}
And in your view:
@UiField ValueListBox<Xxx> combo;
@UiFied TextBox yyy;
@UiHandler('combo")
void onComboValueChanged(ValueChangeEvent<Xxx> event) {
presenter.onSelectedXxxChanged(event.getValue());
}
@Override
public void setYyyEnabled(boolean enabled) {
yyy.setEnabled(enabled);
}
Please let me know where and how should I delegate the event to event
> handlers on selection of the combo box item.
> Should it be handled within Presenter, which cant happen because the
> presenter doesn't has any knowledge of the View component(in our case the
> Text Box that is to be disabled) or it should be handled within the View
> class, but this shouldn't happen as the View should be unaware of the Data
> part.and want some inputs on Request factory also
> http://tbroyer.posterous.com/gwt-211-requestfactory-part-ii
Whether you use RF or not doesn't change anything (using the Editor
framework though blurs the line between presenter and view).
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