GWT MVP Development with Activities and Places

[MBKG]

I read the article:
http://code.google.com/webtoolkit/doc/latest/DevGuideMvpActivitiesAndPlaces.html

Quote:"Many Places in your app might not save any state to the URL, so
they could just extend a BasicPlace which declares a PlaceTokenizer
that returns a null token."

Where can I find BasicPlace?

[David Chandler]

Here you go:

import com.google.gwt.place.shared.Place;
import com.google.gwt.place.shared.PlaceTokenizer;

public class BasicPlace extends Place {
public class BasicPlaceTokenizer implements PlaceTokenizer
{
// Instance of a BasicPlace that will be returned
// for a null token
private BasicPlace place;

// Init this tokenizer with a subclass of BasicPlace
public BasicPlaceTokenizer(BasicPlace basicPlace) {
this.place = basicPlace;
}

@Override
public Place getPlace(String token) {
return this.place;
}

@Override
public String getToken(Place place) {
// BasicPlaces have no state so we can always
// return null. By default, GWT creates a
// URL containing the class name of the Place
// so we don't have to worry about that part.
return null;
}
}
}

Along with this, you'll have to use a TokenizerFactory which provides
a method to obtain the BasicPlaceTokenizer for each sub-class,
something like this:

PlaceTokenizer<MyBasicPlaceSubclass> getMySubclassPlaceTokenizer()
{
return new BasicPlaceTokenizer(new MyBasicPlaceSubclass());
}

In retrospect, BasicPlace likely doesn't buy you much. It's probably
just as easy to create a PlaceTokenizer for each Place in your app as
shown in the article.

/dmc

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David Chandler
Developer Programs Engineer, Google Web Toolkit
http://googlewebtoolkit.blogspot.com/

[MBKG]

Thanks David.
My 2 cents:
If user can go back (URL history) when using BasicPlace?
Could you give a full small example?
Thanks in advance.

On 13 Tháng Mười Một, 00:12, David Chandler <drfibona...@google.com>
wrote:

[Ashton Thomas]

You can find this example: http://gwt.acrinta.com

it is a small sample app that shows how to implement MVP/Gin/etc

It uses AppPlace which other places extends and then
AppPlaceHistoryMapper directly handles all the mapping but you may
want to do something a little more dynamic. This is just one simple
way

on github: https://github.com/ashtonthomas/gwt-seminar