package com.reactnativenavigation.screens; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.view.View; import android.view.ViewGroup; import com.facebook.react.bridge.Arguments; import com.facebook.react.bridge.WritableMap; import com.reactnativenavigation.NavigationApplication; import com.reactnativenavigation.events.EventBus; import com.reactnativenavigation.events.ScreenChangedEvent; import com.reactnativenavigation.events.ViewPagerScreenChangedEvent; import com.reactnativenavigation.events.ViewPagerScreenScrollStartEvent; import com.reactnativenavigation.params.PageParams; import com.reactnativenavigation.views.ContentView; import java.util.List; class ContentViewPagerAdapter extends PagerAdapter implements ViewPager.OnPageChangeListener { private List contentViews; private List pageParams; private int currentPosition = 0; ContentViewPagerAdapter(List contentViews, List pageParams) { this.contentViews = contentViews; this.pageParams = pageParams; } @Override public Object instantiateItem(ViewGroup container, int position) { return contentViews.get(position); } @Override public int getCount() { return contentViews.size(); } @Override public boolean isViewFromObject(View view, Object object) { return view == object; } @Override public CharSequence getPageTitle(int position) { return pageParams.get(position).title; } @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { EventBus.instance.post(new ViewPagerScreenChangedEvent()); currentPosition = position; EventBus.instance.post(new ScreenChangedEvent(pageParams.get(currentPosition))); sendTabSelectedEventToJs(); } @Override public void onPageScrollStateChanged(int state) { if (state == ViewPager.SCROLL_STATE_DRAGGING) { EventBus.instance.post(new ViewPagerScreenScrollStartEvent()); } } private void sendTabSelectedEventToJs() { WritableMap data = Arguments.createMap(); String navigatorEventId = contentViews.get(currentPosition).getNavigatorEventId(); NavigationApplication.instance.getEventEmitter().sendNavigatorEvent("tabSelected", navigatorEventId, data); } }