Allow transition configuration between tabs (#2222)

* allow transition configuration between tabs

* we don't need to pass configureTransition to TabBarComponent

* Update TabAnimations.js

* Update TabNavigator.md

examples/NavigationPlayground/js/App.js

@@ -25,6 +25,7 @@ import StacksInTabs from './StacksInTabs';
 import StacksOverTabs from './StacksOverTabs';
 import SimpleStack from './SimpleStack';
 import SimpleTabs from './SimpleTabs';
+import TabAnimations from './TabAnimations';
 
 const ExampleRoutes = {
   SimpleStack: {
@@ -90,6 +91,11 @@ const ExampleRoutes = {
     screen: SimpleTabs,
     path: 'settings',
   },
+  TabAnimations: {
+    name: 'Animated Tabs Example',
+    description: 'Tab transitions have custom animations',
+    screen: TabAnimations,
+  },
 };
 
 const MainScreen = ({ navigation }) => (

examples/NavigationPlayground/js/TabAnimations.js

@@ -0,0 +1,126 @@
+/**
+ * @flow
+ */
+
+import React from 'react';
+import { Button, ScrollView, Animated } from 'react-native';
+import { StackNavigator, TabNavigator } from 'react-navigation';
+
+import Ionicons from 'react-native-vector-icons/Ionicons';
+import SampleText from './SampleText';
+
+const MyNavScreen = ({ navigation, banner }) => (
+  <ScrollView>
+    <SampleText>{banner}</SampleText>
+    <Button
+      onPress={() => navigation.navigate('Profile', { name: 'Jordan' })}
+      title="Open profile screen"
+    />
+    <Button
+      onPress={() => navigation.navigate('NotifSettings')}
+      title="Open notifications screen"
+    />
+    <Button
+      onPress={() => navigation.navigate('SettingsTab')}
+      title="Go to settings tab"
+    />
+    <Button onPress={() => navigation.goBack(null)} title="Go back" />
+  </ScrollView>
+);
+
+const MyHomeScreen = ({ navigation }) => (
+  <MyNavScreen banner="Home Screen" navigation={navigation} />
+);
+
+const MyProfileScreen = ({ navigation }) => (
+  <MyNavScreen
+    banner={`${navigation.state.params.name}s Profile`}
+    navigation={navigation}
+  />
+);
+
+const MyNotificationsSettingsScreen = ({ navigation }) => (
+  <MyNavScreen banner="Notifications Screen" navigation={navigation} />
+);
+
+const MySettingsScreen = ({ navigation }) => (
+  <MyNavScreen banner="Settings Screen" navigation={navigation} />
+);
+
+const MainTab = StackNavigator({
+  Home: {
+    screen: MyHomeScreen,
+    path: '/',
+    navigationOptions: {
+      title: 'Welcome',
+    },
+  },
+  Profile: {
+    screen: MyProfileScreen,
+    path: '/people/:name',
+    navigationOptions: ({ navigation }) => ({
+      title: `${navigation.state.params.name}'s Profile!`,
+    }),
+  },
+});
+
+const SettingsTab = StackNavigator({
+  Settings: {
+    screen: MySettingsScreen,
+    path: '/',
+    navigationOptions: () => ({
+      title: 'Settings',
+    }),
+  },
+  NotifSettings: {
+    screen: MyNotificationsSettingsScreen,
+    navigationOptions: {
+      title: 'Notifications',
+    },
+  },
+});
+
+const TabAnimations = TabNavigator(
+  {
+    MainTab: {
+      screen: MainTab,
+      path: '/',
+      navigationOptions: {
+        tabBarLabel: 'Home',
+        tabBarIcon: ({ tintColor, focused }) => (
+          <Ionicons
+            name={focused ? 'ios-home' : 'ios-home-outline'}
+            size={26}
+            style={{ color: tintColor }}
+          />
+        ),
+      },
+    },
+    SettingsTab: {
+      screen: SettingsTab,
+      path: '/settings',
+      navigationOptions: {
+        tabBarLabel: 'Settings',
+        tabBarIcon: ({ tintColor, focused }) => (
+          <Ionicons
+            name={focused ? 'ios-settings' : 'ios-settings-outline'}
+            size={26}
+            style={{ color: tintColor }}
+          />
+        ),
+      },
+    },
+  },
+  {
+    tabBarPosition: 'bottom',
+    animationEnabled: true,
+    configureTransition: (currentTransitionProps,nextTransitionProps) => ({
+      timing: Animated.spring,
+      tension: 1,
+      friction: 35,
+    }),
+    swipeEnabled: false,
+  }
+);
+
+export default TabAnimations;