Add Badge support (#70)

* badge support

added badge support

* remove react-native-material-ui

removed react-native-material-ui as dependency. implemented importing local badge component.

* Added Badge.js

Added Badge component to use instead of react-native-material-ui badge

* updated prop types

updated prop types

* removed old prop type

removed old prop type

* documented badge changes

documented badge changes

* fixed isBadgeVisible documentation

fixed isBadgeVisible documentation

* Final changes

final changes

* final changes

final changes

* removed extra dependencies

removed extra dependencies

* android compatibility 

android compatibility

* android compatibility

android compatibility

README.md

@@ -128,7 +128,10 @@ Don't skip this part. You will be happy to know about all the good stuff you can
 | **`activeLabelColor`** | Text Color of the Label when the Tab is active. | `string` | `activeLabelColor` of BottomNavigation |
 | **`barBackgroundColor`** | Background color for the whole component, if the tab is active. | `string` | `backgroundColor` of BottomNavigation |
 | **`onPress`** | Function to be called when the Tab was pressed. **When you use this, the pressed tab won't be active automatically. You need to set it to active by updating `BottomNavigation.activeTab`.** This function will be called with the parameter `(newTabIndex) => {}` | `function` | – |
-
+| **`badgeText`** | Text for the tab's badge. **The badge will be hidden if no badgeText is passed. isBadgeVisible can be used to override this**. | `string` | - |
+| **`badgeSize`** | Size of the badge. Will be used to calculate the height, width, and border radius (height: size, width: size, borderRadius: size/2)  | `number` | 20 |
+| **`badgeStyle`** | Style for the badge. `badgeStyle.container` will be used to determine the badge's container style, and `badgeStyle.text` will be used to determine the badge's text style  | `object` | `{ container: { position: "relative", width: 20, height: 20, borderRadius: 20 / 2, alignItems: "center", justifyContent: "center", backgroundColor: "#F50057", zIndex: 9999, bottom: 5, right: 10 }, text: { color: "#fff", fontWeight: "500", fontSize: 12 } }` |
+| **`isBadgeVisible`** | Determines if the badge is visible or not  | `boolean` | - |
 
 ## Behind the Navigation Bar
 

lib/Badge.js

@@ -0,0 +1,81 @@
+/**
+ * Material badge for showing notifications, maybe more functionality in the future
+ * @flow
+ */
+
+import React, { Component } from 'react'
+import {
+  View,
+  Text,
+  StyleSheet
+} from 'react-native';
+
+type BProps = {
+  text: string,
+  size: number,
+  children: Array<ReactElement<*>>,
+  style: any,
+  isVisible: boolean,
+}
+
+const defaultProps = {
+  size: 20,
+  isVisible: true,
+  style: {},
+}
+
+export default class Badge extends Component {
+  static defaultProps: typeof defaultProps
+  props: BProps
+  static defaultProps = defaultProps
+
+  createStyles() {
+    const { size, style } = this.props;
+    const container = Object.assign(
+      {},
+      {
+        position: "absolute",
+        width: size,
+        height: size,
+        borderRadius: size / 2,
+        alignItems: "center",
+        justifyContent: "center",
+        backgroundColor: "#F50057",
+        zIndex: 9999,
+        bottom: 10,
+      },
+      style.container
+    );
+
+    const text = Object.assign(
+      {},
+      {
+        color: "#fff",
+        fontWeight: "500",
+        fontSize: 12,
+      },
+      style.text
+    )
+
+    return StyleSheet.create({
+      container,
+      text,
+    })
+  }
+
+  render() {
+    const { children, text, isVisible } = this.props;
+    const styles = this.createStyles();
+    if (!isVisible) {
+      return null;
+    }
+
+    return (
+      <View>
+        <View style={styles.container}>
+          <Text style={styles.text}>{text}</Text>
+        </View>
+      </View>
+    )
+  }
+}

lib/Tab.js

@@ -14,6 +14,7 @@ import {
   StyleSheet,
   TouchableWithoutFeedback
 } from 'react-native'
+import Badge from "./Badge"
 import { easeInOut } from './utils/easing'
 
 
@@ -30,7 +31,11 @@ type TabProps = {
   labelColor: string,
   activeLabelColor?: string,
   onTabPress: () => void,
-  onPress: () => void
+  onPress: () => void,
+  badgeText: string,
+  badgeSize: number,
+  badgeStyle: any,
+  isBadgeVisible: boolean,
 }
 
 type TabState = {
@@ -115,15 +120,33 @@ export default class Tab extends Component {
           ]}
         >
           {this._renderIcon()}
+          {this._renderBadge()}
           {this._renderLabel()}
         </View>
       </TouchableWithoutFeedback>
     )
   }
 
+  _renderBadge = () => {
+    const { badgeText, badgeSize, badgeStyle, isBadgeVisible } = this.props;
+
+    if (badgeText === undefined && !isBadgeVisible) {
+      return null;
+    }
+
+    return (
+      <Badge
+        text={badgeText}
+        size={badgeSize}
+        style={badgeStyle}
+        isVisible={isBadgeVisible}
+      />
+    )
+  }
+
   _renderIcon = () => {
-    const mode = this._getModeString()
-    const { active, icon, activeIcon } = this.props
+    const mode = this._getModeString();
+    const { active, icon, activeIcon } = this.props;
 
     return (
       <Animated.View
@@ -133,6 +156,7 @@ export default class Tab extends Component {
           { opacity: this.state[mode].iconOpacity }
         ]}
       >
+
         <View ref="_bnic" collapsable={false}>
           {active && activeIcon ? activeIcon : icon}
         </View>
@@ -276,7 +300,8 @@ const styles = StyleSheet.create({
     paddingBottom: 10,
     paddingLeft: 12,
     paddingRight: 12,
-    backgroundColor: 'transparent'
+    backgroundColor: 'transparent',
+    position: "relative",
   },
   shiftingInactiveContainer: {
     maxWidth: 96,
@@ -298,6 +323,7 @@ const styles = StyleSheet.create({
     includeFontPadding: false,
     textAlignVertical: 'center',
     justifyContent: 'flex-end',
-    backgroundColor: 'transparent'
+    backgroundColor: 'transparent',
+    zIndex: 0
   }
 })