litesoft
@ 811
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package org.litesoft.GWT.client.pavsupport.internal; import java.util.*; import org.litesoft.GWT.client.pavsupport.*; import org.litesoft.core.typeutils.*; import com.google.gwt.event.shared.*; import com.google.gwt.place.shared.*; import com.google.gwt.user.client.ui.*; public class PanelPlaceActivityHelper<CommonActivityParam extends CommonActivityParameter> extends ActivityFactoryRegistry { private static final Activity NULL_ACTIVITY = new Activity() { @Override public String mayStop() { return null; } @Override public void onCancel() { } @Override public void onStop() { } @Override public void start( AcceptsOneWidget panel ) { panel.setWidget( new Label( "!" ) ); } }; private final AcceptsOneWidget mPanel; private final CommonActivityParam mCommonActivityParam; private Activity mCurrentActivity = NULL_ACTIVITY; private Activity mPendingActivity; private Place mCurrentPlace = Place.NOWHERE; private Place mPendingAsyncPlace; private PlaceChangeListener.Source mPlaceChangerRequestedPlaceSource; private Place mPlaceChangerRequestedPlace; private PlaceChangeListener mPlaceChangeListener; public PanelPlaceActivityHelper( AcceptsOneWidget pPanel, CommonActivityParam pCommonActivityParam ) { mPanel = pPanel; mCommonActivityParam = pCommonActivityParam; } public void add( PlaceChangeListener pPlaceChangeListener ) { mPlaceChangeListener = pPlaceChangeListener; } public void placeChangeRequested( Place pPlace, PlaceChangeListener.Source pSource ) { mPlaceChangerRequestedPlace = pPlace; mPlaceChangerRequestedPlaceSource = pSource; } public Place getCurrentPlace() { return mCurrentPlace; } public boolean isPendingAsync( Place pPlace ) { return pPlace.equals( mPendingAsyncPlace ); } public void clearPendingAsync() { mPendingAsyncPlace = null; } public ActivityFactory get( Place pPlace ) { return get( PlaceIdExtractor.getPlaceId( pPlace ) ); } public String getCurrentActivityMayStop() { return mCurrentActivity.mayStop(); } public boolean activate( Place pNewPlace ) { if ( !isPendingAsync( pNewPlace ) ) { mPendingAsyncPlace = null; ActivityFactory zFactory = get( pNewPlace ); if ( zFactory == null ) { return false; } if ( zFactory instanceof ActivityFactory.Asynchronous ) // Un-Happy Case! { loadSyncFactory( (ActivityFactory.Asynchronous) zFactory, mPendingAsyncPlace = pNewPlace ); } else { activate( pNewPlace, (ActivityFactory.Synchronous) zFactory ); } } return true; } /** * Activate the New Place and it's associated Activity (deactivating the current activity. */ public void activate( Place pNewPlace, ActivityFactory.Synchronous pSyncFactory ) { Set<Throwable> zIssues = new LinkedHashSet<Throwable>(); notifyPlaceChangeListener( pNewPlace ); mCurrentPlace = pNewPlace; Activity zNewActivity = Objects.deNull( createActivity( zIssues, pSyncFactory, pNewPlace ), NULL_ACTIVITY ); if ( (mPendingActivity != null) && (mPendingActivity != zNewActivity) ) // The place changed again before the new Activity showed its widget { tryCancel( zIssues, mPendingActivity ); } mPendingActivity = zNewActivity; // Wrap the actual panel with a per-call instance that protects the actual panel from canceled or stopped activities, and // which handles the Pending Activity becoming the Current Activity. AcceptsOneWidget zPanel = new ProtectedDisplay( zIssues, mPendingActivity ); if ( !canStart( zIssues, mPendingActivity, zPanel ) ) { NULL_ACTIVITY.start( new ProtectedDisplay( zIssues, mPendingActivity = NULL_ACTIVITY ) ); // Can NOT fail! } } private void notifyPlaceChangeListener( Place pNewPlace ) { if ( mPlaceChangeListener != null ) { if ( (mPlaceChangerRequestedPlaceSource == null) || // ((mPlaceChangerRequestedPlaceSource == PlaceChangeListener.Source.Forward) && // !Objects.areNonArraysEqual( mPlaceChangerRequestedPlace, pNewPlace )) ) { mPlaceChangerRequestedPlaceSource = PlaceChangeListener.Source.Unexpected; } mPlaceChangeListener.placeChange( mPlaceChangerRequestedPlaceSource, mCurrentPlace, pNewPlace ); } mPlaceChangerRequestedPlaceSource = null; mPlaceChangerRequestedPlace = null; } @SuppressWarnings({"unchecked"}) protected Activity createActivity( Collection<Throwable> pIssues, ActivityFactory.Synchronous pFactory, Place pPlace ) { try { return pFactory.createActivity( mCommonActivityParam, pFactory.getView(), pPlace ); } catch ( Exception e ) { pIssues.add( e ); } return null; } private boolean canStart( Set<Throwable> pIssues, Activity pActivity, AcceptsOneWidget pPanel ) { try { pActivity.start( pPanel ); return true; } catch ( Exception e ) { pIssues.add( e ); } return false; } private void tryCancel( Collection<Throwable> pIssues, Activity pActivity ) { try { pActivity.onCancel(); } catch ( Exception e ) { pIssues.add( e ); } } private void tryStop( Collection<Throwable> pIssues, Activity pActivity ) { try { pActivity.onStop(); } catch ( Exception e ) { pIssues.add( e ); } } private void possiblyUpdateActivityAndShowWidget( Set<Throwable> pIssues, Activity pActivity, IsWidget pWidget ) { if ( mPendingActivity == null ) // Normal? Happy case when No Pending Activity and request is from Current Activity { if ( pActivity == mCurrentActivity ) { showWidget( pWidget ); } return; } if ( pActivity != mPendingActivity ) // Is a Pending Activity, but the request is NOT from it! { return; } tryStop( pIssues, mCurrentActivity ); mCurrentActivity = mPendingActivity; mPendingActivity = null; showWidget( pWidget ); if ( !pIssues.isEmpty() ) { throw new UmbrellaException( pIssues ); } } private void showWidget( IsWidget pWidget ) { if ( mPanel != null ) { mPanel.setWidget( pWidget ); } } @SuppressWarnings({"unchecked"}) private void loadSyncFactory( final ActivityFactory.Asynchronous pAsyncFactory, final Place pPlace ) { pAsyncFactory.load( mCommonActivityParam, new ActivityFactory.Asynchronous.Callback<CommonActivityParam, IsWidget, Place>() { @Override public void loaded( ActivityFactory.Synchronous<CommonActivityParam, IsWidget, Place> pSynchronousFactory ) { switchAsyncToSync( pPlace, pAsyncFactory, pSynchronousFactory ); } } ); } private void switchAsyncToSync( Place pPlace, ActivityFactory.Asynchronous pAsyncFactory, ActivityFactory.Synchronous pSyncFactory ) { System.out.println( "Switched " + Objects.justSimpleName( pPlace ) + " from Async to Sync" ); boolean zStillGoing = pPlace.equals( mPendingAsyncPlace ); mPendingAsyncPlace = null; if ( replace( pAsyncFactory, pSyncFactory ) && zStillGoing ) { activate( pPlace, pSyncFactory ); } } /** * Wraps our real display to prevent an Activity from taking it over if it is * not the currentActivity. */ private class ProtectedDisplay implements AcceptsOneWidget { private final Set<Throwable> mIssues; private final Activity mExpectedActivity; ProtectedDisplay( Set<Throwable> pIssues, Activity pExpectedActivity ) { mIssues = pIssues; mExpectedActivity = pExpectedActivity; } @Override public void setWidget( IsWidget pWidget ) { possiblyUpdateActivityAndShowWidget( mIssues, mExpectedActivity, pWidget ); } } } |
Commits for litesoft/trunk/Java/GWT/Client/src/org/litesoft/GWT/client/pavsupport/internal/PanelPlaceActivityHelper.java
Revision | Author | Commited | Message |
---|---|---|---|
811 Diff | GeorgeS | Sat 18 Aug, 2012 13:45:18 +0000 | |
804 Diff | GeorgeS | Wed 15 Aug, 2012 12:48:51 +0000 | |
737 Diff | GeorgeS | Sun 24 Jun, 2012 16:36:32 +0000 | ! |
735 Diff | GeorgeS | Sat 23 Jun, 2012 15:05:41 +0000 | ! |
720 Diff | GeorgeS | Sun 10 Jun, 2012 16:20:42 +0000 | |
712 | GeorgeS | Sat 09 Jun, 2012 22:46:04 +0000 | Move PAV stuff into LiteSoft |