Improve documentation of lazy property on TabNavigatorConfig

docs/bottom-tab-navigator.md

@@ -23,6 +23,7 @@ The route configs object is a mapping from route name to a route config, which t
 * `order` - Array of routeNames which defines the order of the tabs.
 * `paths` - Provide a mapping of routeName to path config, which overrides the paths set in the routeConfigs.
 * `backBehavior` - Should the back button cause a tab switch to the initial tab? If yes, set to `initialRoute`, otherwise `none`. Defaults to `initialRoute` behavior.
+* `lazy` - Defaults to `true`. If `false`, all tabs are rendered immediately. When `true`, tabs are rendered only when they are made active for the first time. Note: tabs are **not** re-rendered upon subsequent visits.
 * `tabBarComponent` - Optional, override component to use as the tab bar.
 * `tabBarOptions` - An object with the following properties:
   * `activeTintColor` - Label and icon color of the active tab.

docs/tab-navigator.md

@@ -20,7 +20,7 @@ The route configs object is a mapping from route name to a route config, which t
 * `tabBarPosition` - Position of the tab bar, can be `'top'` or `'bottom'`.
 * `swipeEnabled` - Whether to allow swiping between tabs.
 * `animationEnabled` - Whether to animate when changing tabs.
-* `lazy` - Defaults to `true`. If `false`, all tabs are rendered immediately. When `true`, tabs are rendered only when they are made active.
+* `lazy` - Defaults to `true`. If `false`, all tabs are rendered immediately. When `true`, tabs are rendered only when they are made active for the first time. Note: tabs are **not** re-rendered upon subsequent visits.
 * `removeClippedSubviews` - Defaults to `true`. An optimization to reduce memory usage by freeing resources used by inactive tabs.
 * `initialLayout` - Optional object containing the initial `height` and `width`, can be passed to prevent the one frame delay in [react-native-tab-view](https://github.com/react-native-community/react-native-tab-view#avoid-one-frame-delay) rendering.
 * `tabBarOptions` - Configure the tab bar, see below.

website/versioned_docs/version-3.x/bottom-tab-navigator.md

@@ -24,6 +24,7 @@ The route configs object is a mapping from route name to a route config, which t
 * `order` - Array of routeNames which defines the order of the tabs.
 * `paths` - Provide a mapping of routeName to path config, which overrides the paths set in the routeConfigs.
 * `backBehavior` - Should the back button cause a tab switch to the initial tab? If yes, set to `initialRoute`, otherwise `none`. Defaults to `initialRoute` behavior.
+* `lazy` - Defaults to `true`. If `false`, all tabs are rendered immediately. When `true`, tabs are rendered only when they are made active for the first time. Note: tabs are **not** re-rendered upon subsequent visits.
 * `tabBarComponent` - Optional, override component to use as the tab bar.
 * `tabBarOptions` - An object with the following properties:
   * `activeTintColor` - Label and icon color of the active tab.

website/versioned_docs/version-3.x/tab-navigator.md

@@ -0,0 +1,126 @@
+---
+id: version-3.x-tab-navigator
+title: createTabNavigator
+sidebar_label: createTabNavigator
+original_id: tab-navigator
+---
+
+> Note: `createTabNavigator` is deprecated. Please use `createBottomTabNavigator` and/or `createMaterialTopTabNavigator` instead.
+
+```js
+createTabNavigator(RouteConfigs, TabNavigatorConfig);
+```
+
+## RouteConfigs
+
+The route configs object is a mapping from route name to a route config, which tells the navigator what to present for that route, see [example](stack-navigator.html#routeconfigs) from stack navigator.
+
+## TabNavigatorConfig
+
+* `tabBarComponent` - Component to use as the tab bar, e.g. `TabBarBottom` (this is the default on iOS), `TabBarTop` (this is the default on Android).
+* `tabBarPosition` - Position of the tab bar, can be `'top'` or `'bottom'`.
+* `swipeEnabled` - Whether to allow swiping between tabs.
+* `animationEnabled` - Whether to animate when changing tabs.
+* `lazy` - Defaults to `true`. If `false`, all tabs are rendered immediately. When `true`, tabs are rendered only when they are made active for the first time. Note: tabs are **not** re-rendered upon subsequent visits.
+* `removeClippedSubviews` - Defaults to `true`. An optimization to reduce memory usage by freeing resources used by inactive tabs.
+* `initialLayout` - Optional object containing the initial `height` and `width`, can be passed to prevent the one frame delay in [react-native-tab-view](https://github.com/react-native-community/react-native-tab-view#avoid-one-frame-delay) rendering.
+* `tabBarOptions` - Configure the tab bar, see below.
+
+Several options get passed to the underlying router to modify navigation logic:
+
+* `initialRouteName` - The routeName for the initial tab route when first loading.
+* `order` - Array of routeNames which defines the order of the tabs.
+* `paths` - Provide a mapping of routeName to path config, which overrides the paths set in the routeConfigs.
+* `backBehavior` - Should the back button cause a tab switch to the initial tab? If yes, set to `initialRoute`, otherwise `none`. Defaults to `initialRoute` behavior.
+
+### `tabBarOptions` for `TabBarBottom` (default tab bar on iOS)
+
+* `activeTintColor` - Label and icon color of the active tab.
+* `activeBackgroundColor` - Background color of the active tab.
+* `inactiveTintColor` - Label and icon color of the inactive tab.
+* `inactiveBackgroundColor` - Background color of the inactive tab.
+* `showLabel` - Whether to show label for tab, default is true.
+* `style` - Style object for the tab bar.
+* `labelStyle` - Style object for the tab label.
+* `tabStyle` - Style object for the tab.
+* `allowFontScaling` - Whether label font should scale to respect Text Size accessibility settings, default is true.
+* `safeAreaInset` - Override the `forceInset` prop for `<SafeAreaView>`. Defaults to `{ bottom: 'always', top: 'never' }`. Available keys are `top | bottom | left | right` provided with the values `'always' | 'never'`.
+
+Example:
+
+```js
+tabBarOptions: {
+  activeTintColor: '#e91e63',
+  labelStyle: {
+    fontSize: 12,
+  },
+  style: {
+    backgroundColor: 'blue',
+  },
+}
+```
+
+### `tabBarOptions` for `TabBarTop` (default tab bar on Android)
+
+* `activeTintColor` - Label and icon color of the active tab.
+* `inactiveTintColor` - Label and icon color of the inactive tab.
+* `showIcon` - Whether to show icon for tab, default is false.
+* `showLabel` - Whether to show label for tab, default is true.
+* `upperCaseLabel` - Whether to make label uppercase, default is true.
+* `pressColor` - Color for material ripple (Android >= 5.0 only).
+* `pressOpacity` - Opacity for pressed tab (iOS and Android < 5.0 only).
+* `scrollEnabled` - Whether to enable scrollable tabs.
+* `tabStyle` - Style object for the tab.
+* `indicatorStyle` - Style object for the tab indicator (line at the bottom of the tab).
+* `labelStyle` - Style object for the tab label.
+* `iconStyle` - Style object for the tab icon.
+* `style` - Style object for the tab bar.
+* `allowFontScaling` - Whether label font should scale to respect Text Size accessibility settings, default is true.
+
+Example:
+
+```js
+tabBarOptions: {
+  labelStyle: {
+    fontSize: 12,
+  },
+  tabStyle: {
+    width: 100,
+  },
+  style: {
+    backgroundColor: 'blue',
+  },
+}
+```
+
+## `navigationOptions` for screens inside of the navigator
+
+#### `title`
+
+Generic title that can be used as a fallback for `headerTitle` and `tabBarLabel`.
+
+#### `tabBarVisible`
+
+True or false to show or hide the tab bar, if not set then defaults to true.
+
+#### `swipeEnabled`
+
+True or false to enable or disable swiping between tabs, if not set then defaults to TabNavigatorConfig option swipeEnabled.
+
+#### `tabBarIcon`
+
+React Element or a function that given `{ focused: boolean, horizontal: boolean, tintColor: string }` returns a React.Node, to display in the tab bar. `horizontal` is `true` when the device is in landscape and `false` when portrait. The icon is re-rendered whenever the device orientation changes.
+
+#### `tabBarLabel`
+
+Title string of a tab displayed in the tab bar or React Element or a function that given `{ focused: boolean, tintColor: string }` returns a React.Node, to display in tab bar. When undefined, scene `title` is used. To hide, see `tabBarOptions.showLabel` in the previous section.
+
+#### `tabBarOnPress`
+
+Callback to handle tap events; the argument is an object containing:
+
+* the `previousScene: { route, index }` which is the scene we are leaving
+* the `scene: { route, index }` that was tapped
+* the `jumpToIndex` method that can perform the navigation for you
+
+Useful for adding a custom logic before the transition to the next scene (the tapped one) starts.