Re: GWT : Activities and Places AND History

You shouldn't have several PlaceHistoryHandler: there's only one history, so there should be only one thing handling and managing it.

That said, I've heard people using nested activities, but it's not been designed with the use case in mind; see http://blog.ltgt.net/gwt-21-activities-nesting-yagni

If you think you really need nesting, then hae a look at GWT-P.

Last thing, I don't understand why you have MainThreePlace subclasses rather than just using its "name" property (e.g. new MainThreePlace("SubOnePlace"))

On Saturday, August 3, 2013 8:00:17 AM UTC+2, asif...@gmail.com wrote:

I made some minor changes in the code - the main activity mapper looks like this

        if (place instanceof MainTwoPlace)
        {
            return new MainTwoActivity(clientFactory);
        } else if (place instanceof MainThreePlace) {
            return new MainThreeActivity(clientFactory); // this should be handled in the sub-activitymapper - hence return null and do nothing
        }
        return new MainOneActivity(clientFactory); // if place doesn't match, just drop down to main page

However, the View 3 now crashes with

Caused by: com.google.gwt.core.client.JavaScriptException: (HierarchyRequestError): Node cannot be inserted at the specified point in the hierarchy

on line ->         panel.setWidget(mainThreeDefaultView); in MainThreeActivity Line 31;

Another picture of my View 3:-




Now my eventbus, placecontroller and historymapper code in View 3 is as follows:-

EventBus eventBus = mainClientFactory.getEventbus();
       

        placeController = mainClientFactory.getPlacecontroller();
       

        subActivityMapper = new SubActivityMapper(mainClientFactory);
        subActivityManager = new ActivityManager(subActivityMapper, eventBus);
        //subActivityManager.setDisplay(singleWidgetPanel);
        subActivityManager.setDisplay(contentPanel);
       
        subPlaceHistoryHandler = new PlaceHistoryHandler(mainClientFactory.getMainhistoryMapper());
        subPlaceHistoryHandler.register(placeController, eventBus, new MainThreeSubOnePlace());

The latest source code is attached here. The previous one can be ignored.

Any idea where I am going wrong? I know it is in the MainThreeView and the activitymapper somewhere - but a help/hint would be really appreciated.

Thanks

On Friday, August 2, 2013 11:58:09 PM UTC-4, asif...@gmail.com wrote:

Hi Thomas,

So I tried working out a small prototype:-
1>. The main app has 3 views with corresponding activity and place. The main app also has an activity mapper which handles View 1 and View 2.
Here is the activitymapper

if (place instanceof MainTwoPlace)
        {
            return new MainTwoActivity(clientFactory);
        } else if (place instanceof MainThreePlace) {
            return null; // this should be handled in the sub-activitymapper - hence return null and do nothing
        }
        return new MainOneActivity(clientFactory); // if place doesn't match, just drop down to main page

2>. View 3 has has 3 sub-views with corresponding activity and place. View 3 has a sub-activity mapper which handles sub-view1, sub-view2 and sub-view 3.
HEre is the sub-activity mapper

if (place instanceof MainThreePlace) {
            String token = ((MainThreePlace) place).getName();
            if ((token.equals("SubOnePlace")) || (token.equals("MainThreePlace"))) {
                return new MainThreeSubOneActivity(mainClientFactory);
            } else if (token.equals("SubTwoPlace")) {
                return new MainThreeSubOneActivity(mainClientFactory);
            } else if (token.equals("SubThreePlace")) {
                return new MainThreeSubOneActivity(mainClientFactory);
            } else {
                return new MainThreeActivity(mainClientFactory);
            }
           
        }else {
            return null;
        }

Now Switching to place/view 1 and 2 ( in main app ) works fine.

However switching to place 3  - the application goes into a crazy loop in the getplace / gettoken loop.

What I am confused about  - switching to 3 should launch the default/sub-view 1 - but this seems not to work.

Could you please help me figure out where I am going wrong? The compressed folder of the entire sources is attached here



On Thursday, August 1, 2013 6:16:38 PM UTC-4, Thomas Broyer wrote:

The behavior when called from onModuleLoad is unexpected; but calling PlaceController#goTo in onModuleLoad is also unexpected: 99.9% of the cases, you'll want to call PlaceHistoryHandler#handleCurrentHistory, and possibly set new RootPlace("ChartTest") as the default place when initializing the PlaceHistoryHandler.

There are probably legitimate use cases for calling goTo from onModuleLoad, so if you believe you're in this case, feel free to open an issue in the tracker (don't forget to precise the browser(s) it happens in, and the version of GWT being used).

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