Change topTabParams to PageParams

TopTabParams are a subset of ScreenParams, moved the properties that
are shared by both classes to BaseScreenParams.
This change was needed to report screen changes properly in ViewPagerScreen

android/app/src/main/java/com/reactnativenavigation/events/ScreenChangedEvent.java

 package com.reactnativenavigation.events;
 
+import com.reactnativenavigation.params.BaseScreenParams;
 import com.reactnativenavigation.params.FabParams;
-import com.reactnativenavigation.params.ScreenParams;
-import com.reactnativenavigation.params.TopTabParams;
+import com.reactnativenavigation.params.PageParams;
 
 public class ScreenChangedEvent implements Event {
     public static final String TYPE = "ScreenChangedEvent";
     public FabParams fabParams;
 
-    public ScreenChangedEvent(ScreenParams screenParams) {
+    public ScreenChangedEvent(BaseScreenParams screenParams) {
         this.fabParams = screenParams.fabParams;
     }
 
-    public ScreenChangedEvent(TopTabParams topTabParams) {
+    public ScreenChangedEvent(PageParams topTabParams) {
         this.fabParams = topTabParams.fabParams;
     }
 

android/app/src/main/java/com/reactnativenavigation/layouts/SingleScreenLayout.java

 
         if (stack.canPop()) {
             stack.pop(true);
+            EventBus.instance.post(new ScreenChangedEvent(stack.peek().getScreenParams()));
             return true;
         } else {
             return false;

android/app/src/main/java/com/reactnativenavigation/params/BaseScreenParams.java

+package com.reactnativenavigation.params;
+
+import android.os.Bundle;
+
+import java.util.List;
+
+public class BaseScreenParams {
+    public String screenId;
+    public String title;
+    public NavigationParams navigationParams;
+    public List<TitleBarButtonParams> rightButtons;
+    public TitleBarLeftButtonParams leftButton;
+    public FabParams fabParams;
+
+    public boolean overrideBackPressInJs;
+    public StyleParams styleParams;
+    public String fragmentCreatorClassName;
+    public Bundle fragmentCreatorPassProps;
+    public boolean animateScreenTransitions;
+
+    public boolean isFragmentScreen() {
+        return fragmentCreatorClassName != null;
+    }
+
+    public String getScreenInstanceId() {
+        return navigationParams.screenInstanceId;
+    }
+
+    public String getNavigatorId() {
+        return navigationParams.navigatorId;
+    }
+
+    public String getNavigatorEventId() {
+        return navigationParams.navigatorEventId;
+    }
+}

android/app/src/main/java/com/reactnativenavigation/params/PageParams.java

+package com.reactnativenavigation.params;
+
+public class PageParams extends BaseScreenParams {
+
+
+}

android/app/src/main/java/com/reactnativenavigation/params/ScreenParams.java

 package com.reactnativenavigation.params;
 
 import android.graphics.drawable.Drawable;
-import android.os.Bundle;
 
 import java.util.List;
 
-public class ScreenParams {
-    public String screenId;
-    public List<TitleBarButtonParams> rightButtons;
-    public TitleBarLeftButtonParams leftButton;
-    public boolean overrideBackPressInJs;
-    public String title;
-    public StyleParams styleParams;
-    public List<TopTabParams> topTabParams;
-    public String fragmentCreatorClassName;
-    public Bundle fragmentCreatorPassProps;
-    public boolean animateScreenTransitions;
-    public FabParams fabParams;
+public class ScreenParams extends BaseScreenParams {
+
     public String tabLabel;
     public Drawable tabIcon;
-
-    public NavigationParams navigationParams;
+    public List<PageParams> topTabParams;
 
     public boolean hasTopTabs() {
         return topTabParams != null && !topTabParams.isEmpty();
     }
 
-    public boolean isFragmentScreen() {
-        return fragmentCreatorClassName != null;
-    }
-
-    public String getScreenInstanceId() {
-        return navigationParams.screenInstanceId;
-    }
-
-    public String getNavigatorId() {
-        return navigationParams.navigatorId;
-    }
-
-    public String getNavigatorEventId() {
-        return navigationParams.navigatorEventId;
-    }
 }

android/app/src/main/java/com/reactnativenavigation/params/TopTabParams.java

-package com.reactnativenavigation.params;
-
-import java.util.List;
-
-public class TopTabParams {
-    public String screenId;
-    public String title;
-    public NavigationParams navigationParams;
-    public List<TitleBarButtonParams> rightButtons;
-    public TitleBarLeftButtonParams leftButton;
-    public FabParams fabParams;
-}

android/app/src/main/java/com/reactnativenavigation/params/parsers/ScreenParamsParser.java

 
 import com.reactnativenavigation.params.NavigationParams;
 import com.reactnativenavigation.params.ScreenParams;
-import com.reactnativenavigation.params.TopTabParams;
+import com.reactnativenavigation.params.PageParams;
 import com.reactnativenavigation.react.ImageLoader;
 
 import java.util.List;
         return tabLabel;
     }
 
-    private static List<TopTabParams> parseTopTabs(Bundle params) {
-        List<TopTabParams> topTabParams = null;
+    private static List<PageParams> parseTopTabs(Bundle params) {
+        List<PageParams> topTabParams = null;
         if (hasKey(params, TOP_TABS)) {
             topTabParams = new TopTabParamsParser().parse(params.getBundle(TOP_TABS));
         }

android/app/src/main/java/com/reactnativenavigation/params/parsers/TopTabParamsParser.java

 import android.support.annotation.NonNull;
 
 import com.reactnativenavigation.params.NavigationParams;
-import com.reactnativenavigation.params.TopTabParams;
+import com.reactnativenavigation.params.PageParams;
 
 import java.util.List;
 
     private static final String NAVIGATION_PARAMS = "navigationParams";
 
     @SuppressWarnings("ConstantConditions")
-    public List<TopTabParams> parse(Bundle params) {
-        return parseBundle(params, new ParseStrategy<TopTabParams>() {
+    public List<PageParams> parse(Bundle params) {
+        return parseBundle(params, new ParseStrategy<PageParams>() {
             @Override
-            public TopTabParams parse(Bundle topTabs) {
+            public PageParams parse(Bundle topTabs) {
                 return parseItem(topTabs);
             }
         });
     }
 
     @NonNull
-    private static TopTabParams parseItem(Bundle params) {
-        TopTabParams result = new TopTabParams();
+    private static PageParams parseItem(Bundle params) {
+        PageParams result = new PageParams();
         result.screenId = params.getString(KEY_SCREEN_ID);
         result.title = params.getString(KEY_TITLE);
         result.navigationParams = new NavigationParams(params.getBundle(NAVIGATION_PARAMS));

android/app/src/main/java/com/reactnativenavigation/screens/ContentViewPagerAdapter.java

 import com.reactnativenavigation.NavigationApplication;
 import com.reactnativenavigation.events.EventBus;
 import com.reactnativenavigation.events.ScreenChangedEvent;
-import com.reactnativenavigation.params.TopTabParams;
+import com.reactnativenavigation.params.PageParams;
 import com.reactnativenavigation.views.ContentView;
 
 import java.util.List;
 
 public class ContentViewPagerAdapter extends PagerAdapter implements ViewPager.OnPageChangeListener {
     private List<ContentView> contentViews;
-    private List<TopTabParams> topTabParams;
+    private List<PageParams> pageParams;
     private int currentPosition = 0;
 
-    public ContentViewPagerAdapter(List<ContentView> contentViews, List<TopTabParams> topTabParams) {
+    public ContentViewPagerAdapter(List<ContentView> contentViews, List<PageParams> pageParams) {
         this.contentViews = contentViews;
-        this.topTabParams = topTabParams;
+        this.pageParams = pageParams;
     }
 
     @Override
 
     @Override
     public CharSequence getPageTitle(int position) {
-        return topTabParams.get(position).title;
+        return pageParams.get(position).title;
     }
 
     @Override
     @Override
     public void onPageSelected(int position) {
         currentPosition = position;
-        EventBus.instance.post(new ScreenChangedEvent(topTabParams.get(currentPosition)));
+        EventBus.instance.post(new ScreenChangedEvent(pageParams.get(currentPosition)));
         sendTabSelectedEventToJs();
     }
 

android/app/src/main/java/com/reactnativenavigation/screens/Screen.java

 import android.widget.RelativeLayout;
 
 import com.reactnativenavigation.animation.VisibilityAnimator;
+import com.reactnativenavigation.params.BaseScreenParams;
 import com.reactnativenavigation.params.ScreenParams;
 import com.reactnativenavigation.params.StyleParams;
 import com.reactnativenavigation.params.TitleBarButtonParams;
         return screenParams.getNavigatorEventId();
     }
 
-    public ScreenParams getScreenParams() {
+    public BaseScreenParams getScreenParams() {
         return screenParams;
     }
 

android/app/src/main/java/com/reactnativenavigation/screens/ViewPagerScreen.java

 import android.support.v4.view.ViewPager;
 import android.support.v7.app.AppCompatActivity;
 
+import com.reactnativenavigation.params.BaseScreenParams;
 import com.reactnativenavigation.params.ScreenParams;
-import com.reactnativenavigation.params.TopTabParams;
+import com.reactnativenavigation.params.PageParams;
 import com.reactnativenavigation.views.ContentView;
 import com.reactnativenavigation.views.LeftButtonOnClickListener;
 
         super(activity, screenParams, backButtonListener);
     }
 
+    @Override
+    public BaseScreenParams getScreenParams() {
+        return screenParams.topTabParams.get(viewPager.getCurrentItem());
+    }
+
     @Override
     protected void createContent() {
         TabLayout tabLayout = topBar.initTabs();
 
     private void addPages() {
         contentViews = new ArrayList<>();
-        for (TopTabParams tab : screenParams.topTabParams) {
+        for (PageParams tab : screenParams.topTabParams) {
             ContentView contentView = new ContentView(getContext(), tab.screenId, tab.navigationParams);
             addContent(contentView);
             contentViews.add(contentView);